Fosi v3 Review - The Good, The Bad & The Ugly
ฝัง
- เผยแพร่เมื่อ 29 มิ.ย. 2024
- We review the FOSI v3 amplifier and compare it to a top flight Yamaha A-S2100 Integrated amp.
Amazon purchase link: bit.ly/azitv3
Aliexpress link: www.aliexpress.com/item/10050...
Official purchase link: bit.ly/fosiaudiov3
10% off promo code: YTB10V3FA (only works for official website)
Chapters:
0:00 Introduction FOSI v3
0:25 Unboxing FOSI v3
2:32 Background
3:59 The Good
5:29 The Bad
7:50 The Ugly
12:51 Yamaha R-S300
14:00 Equipment Used for Testing
14:40 Setting Levels
16:00 Music Test - Jack In The Green
18:33 16 kHZ Test
19:18 Music Test - Good Times Bad Times
20:00 REW Test Sweeps
23:40 Conclusion
24:40 Wine Rating - บันเทิง
One thing to remine you, Fosi V3 (and many other small amps using the TI TPA3255 chip) is that this chip has a very low gain of 21.5dB (or about 11.9x). So if you use a standard line input level (1Vrms) to feed into this amp, the maximum output of this amp will be 17.7W at 8Ω and 35.4W at 4Ω, no matter which power supply you use. And probably the integrated amp you used to test has will have a gain matched to the line input level. Anyway, wish you happy listening to white noise!
Excellent information. Thanks.
Yep ... these TPA3255 chips are input hungry.
You need a CD player or DAC with about 2 volts of output to even get close to clipping with them.
The V3 is capable of producing the amount of power that was previously measured by other reviewers. The problem is that music is 12dB lower than test tones. That means 4 times less input voltage signal to the amplifier. So, with the potentiometer at maximum your amplifier gets 0.5V(with a good DAC). The amplifier gain was measured at 26dB, this means 20 times the input voltage at the output. 0.5V x 20 = 10V. Now, Power= V^2/R, then 10x10/8 =12.5W. Far from the 50 to 60w measured with test tones. What's the solution? Get a preamp and increase the input signal to the amplifier. Buying a bigger power supply does not magically give you more power. You need an input signal high enough for the amplifier to require more voltage and current from the power supply.
People think that DACs produce 2V music input signal. But that's only for test tones at OdbFs, music is way lower than that.
Additionally the V3 has a Logarithmic potentiometer which at half only allows 10% and at 3/4 it allows 30% of the input signal to pass. Only at the last 1/4 it's where you get most of the power. At 90% of the pot you only get 50% of the signal. Just give you an idea. Basically people are not giving the amp the right input signal.
same input signal was given to a 50 watt old Yamaha receiver rated at 1/3 the watts and it hit 93dB. Couldn’t get the FOSI past 77-83 max volume- logarithmic doesn’t matter at 100%. I didn’t even go full power with the A-S2100 , it hit 105 dB at 3/4 on the volume. At 85dB the Yamaha was outputting barely under 1 watt. Under 2 at 88dB, 3 at 91 dB, 6 at 94dB, 12 at 94dB, 24 at 97 dB, 48 at 100 dB , 96 at 103dB.
@scientificaudiophile yes, but the Fosi has lower Gain, hence output power at the same input signal. Just give it more input signal. If the Fosi V3 with 26dB Gain is giving a hard time, then I can't imagine what would happen with amplifiers with 10dB Gain like those high performers from the top of the list on ASR
ASR is ok on tech specs, but 1khZ isn’t a real signal. Do your own test, the FOSI v3 can’t handle a full load.
Spot on. This is an amp gain issue not a power output issue. Where’s the science in this “scientific audiophile” review.
But then there was a comparison. Everything is the same, the same was applied to Yamaha! That's why I don't agree with you.
Fun review! Thanks. I have the Fosi TB-10D, I use it for casual listening because it doesn't heat my room much and cause the AC to come on. It sounds pretty good too. I use my Yamaha A-1020 integrated amplifier for serious hi fi listening though.
Thanks for sharing!
On😊
Can’t wait!
I have some spare time while waiting at the tire shop. So I'll explain a little bit about power, gain, input signal , etc... let's do a math exercise. For example to get 100W per channel with a 4 ohm load we have P=V^2/R. 100W=V^2/4. Then V=20V. We need 20Vrms at the amplifier output. How do we get those 20V depends on the input signal and the amplifier gain. For simplicity let's max out the volume pot. That means that whatever input signal we apply to the amplifier via the RCA connectors go into the TPA3255 chip. According to other testing the amplifier has 26dB gain(just as a reference the Aiyima A07 has 29db gain, this means the output Power will be double or 3dB more than the V3 at any input signal voltage) 26dB means a 20x voltage gain compared to the input signal. So if we need 20V at the output with a 26db gain we need a 1Vrms input signal. You may think this is not much but the truth is that it is very hard to get 1Vrms with music or white/pink noise. Just try measuring the voltage at the RCA connector to realize you hardly get 0.5V even with a good DAC, why?. Because music signals are not at 0dBFS (like with test tones 1kHZ or whatever frequency). Music has in average -12dBFS, this means 4 times less voltage than what the DAC is capable of producing. So a good 2Vrms DAC will produce 0.5Vrms music signal. And a 0.5V input signal produces 4 times less output Power or 2 times less output voltage compared to 1Vrms. In the end 0.5V will only produce 25W on the V3. To get more power to need a bigger input signal.
Now, let's do the same exercise with the A07 which has 29dB gain, 3dB more than the V3. Just to simplify the output power will be 2 times the V3 power at the same input signal. This means 50W with a musical signal of 0.5Vrms, which again its not that easy to produce.
So, all in all. Without knowing what input signal voltage was used on this video, and based on the poor output power , I can assume it was not very high, probable 0.1Vrms or something like that.
Your analysis is mostly correct... except for one thing ... Both Fosi and Aiyima are using the chip's basic 21.5db gain.
@@Douglas_Blake_579 Yes, the chip has a 21.5dB gain. This means whatever signal reaches the chipset input will be increase 21.5dB. But the total amplifier gain is higher than that, because this consider the gain applied by the opamp stages(which in not unity gain).
If you apply 1V at full pit position the you get almost 29V at the output(29.2dB gain) then where did the extra gain come from if the chip provides 21.5dB? That extra gain is why Fosi and Aiyima sound so different (volume wize) while using the same input even at 100% pot position. Because Fosi V3 has 3dB lower total gain(26 vs 29)
@@MiguelAngelVelazquez
In the V3 and A07 you have only two op-amp chips, both of which are acting as phase splitters for the main chip's balanced inputs... These are almost always unity gain.
But, I will double check. Thanks for the tip!
Great review. Just purchased the new fosi ZA3 and had the exact same problem. Even cranking the fosi to max volume couldn’t compare to my HK amp rated at 80W in 8 ohms. Further more, it didn’t matter if I was using a turntable with a preamp, CD player or Tuner. The results were the same with very low volume on every device unless I turned volume to max. Also, both rca back terminal came off switching cables. Fosi customer service was fantastic and has offered to replace the amp but not sure if a new amp will be any better.
Might want to check out the Aiyima. More powerful but probably not as powerful as your HK.
th-cam.com/video/3eow80uGMMU/w-d-xo.html
Strange. I have 2 Fosi V3 with 48v power supply. With my PSB Stratus Gold 4 ohm 88 db, I can get peaks just a bit over 100 db with music. Preamp is using Topping E50. The sound is very clean at max volume. Zero issues with bass. Clean and tight. FYI the 48v version is currently $95 on their website. We do get it though. You like Yamaha. You don’t like Fosi.
With music I could as well. White/pink noise was the issue because music is not all frequencies at once. Plus 4 ohm are less of a load than my 6 ohm Tannoys. Thanks for the comment.
@@scientificaudiophilemy issue is you seem to have some bizarre fight against this and similar amps. You told everyone on this vid that this amp can’t play loud with low distortion. Sorry man. I just don’t believe you. I was skeptical but this thing kills it. With the 48v power supply this thing is a monster with no edge to it. I am ordering a Yamaha as801, so I guess I’ll wait and see, but I have several amps more powerful than that and i have been blown away how dynamic this thing is.
Proove it. With full range music and not "girl and guitar" chill jazz. You must have extremely sensitive speakers. I wonder why touring musicians don't have small chip amps with them on the road if they could easily be playing 100 dB SPL in a pub.
😂
Something that "bothers" me from the ASR site is it does not say what input voltage was required to produce those power figure. I mean , I know hoy to calculate them but many people don't, so an expectation is created and people think they will get those high numbers by just connecting their phones and buying a 48V power supply. My friends you need a high input signal which sometimes can only he achieved with a preamp.
And the lower the amplifier gain the higher input signal is required.
I really don't care about power figures. I don't need more than 5W. I just use a good input signal from my DAC and preamp and leave the potentiometer around 20% , and then use the remote control from the DAC. That gives me plenty of power for my needs.
Yep, same here ... I use an HTPC, my amp's volume control sits at about 10 o'clock most of the time and I control the actual listening volume with a wireless keyboard. I have never liked loud music so I doubt I ever get the thing over 10 watts on peaks and probably average about 2 watts... so it's plenty good enough.
The V3 needs a line level booster, Douk Audio sells one on Amazon, and it lights up the V3 for $45.
I am shocked that there are less than 5k subscribers. You need to run a test on that.
One component missing (GAIN!!!)
The chipset is typically designed not defending Fosi but its peak is 51 volts on the TI spec sheet what is not said is ot needs a large capacitor bank on the power rails...
But thats what is missing a capacitor reserve that the Yamaha has.
[ If one hooks up that Amp with a 130 amp capacitor bank feeding the rails the results would blow UR mind]
Then you can get close to 600 watt peaks
I have one of these and it hits hard with my klipsch towers. For the price I think it is an incredible piece of equipment.
What's the point having even best amp in the world if that can not drive your speakers loud enough?
Good test for V3 would be comparison with TI 3255 evaluation board..
thank you.
I've had the v3 for a few months now on my desk, use it 5 days a week. I have to say that I absolutely hate it. It sounds fine on low volumes, but start cranking it beyond 10 on the dial and it falls apart. The music sounds compressed, the bass is flabby, and the sound is harsh and grating. I'm glad I stumbled on this video because you're the first reviewer to mention the shortcomings of this amp. Cheers and thanks
Thanks.
What speakers do you have it connected to?
I constantly see people thinking these amplifiers are just desktop toys and dumping 100 watts in to 4 inch drivers, wondering why it sounds like crap... it is overpowering the speakers.
I have a TPA3255 based amplifier, also from Fosi, connected to a pair of Pioneer Tower speakers and it drives them to amazing sound levels.
The lesson... Small amp does not mean small speakers.
TPA 3255 from Texas Instrument is a very good chip power amp. I stop listening to my EL84 Tube amp when I compared its SQ. Well, it is subjective though. But what matters is, im enjoying listening to music with TPA 3255 chip power amp.
Another stunning video
Glad you enjoyed it
I use Pro Woofer/Ported Klipsch Heresy Speakers I call "Super Heresy" with B&C DE-120 drivers on sMAHL Tractrix drop-in horns as surrounds. The mains are ALL Horn Loaded, even the Subs. They come in at 100-112 db/Watt and only need aout 100 milliwatts to play at the levels in this video. Get commercial horns speakers, make room, and you will never need more than this amplifier, even at stupid LOUD levels! I have data too.
This v3 beat out my Marantz NR1200. Its not always about how loud something gets but more so on how loud it gets with good sound. The Marantz and the v3 got too similar levels of loudness but the Marantz sounded very small and a mono small soundstage. The V3 sounded more full, thicker bass, the right amount of highs for me and a wider soundstage. Between these two i kept the v3 and returned the Marantz. Sure it has alot to offer, hdmi,wifi, fm radio but it all comes down to my ears in the end and the feelings you get when listening to audio.
Also mine doesn't go up to just 83db , about 6ft away from my speakers using the v3 i was hitting 108db on music and 35 feet away in my bedroom getting 80-85db
Yamaha A-S2100 retailed for nearly $4K and the Fosi V3 for $90...is this a revelation? Cheap class D is often hyped by theoretical limits but at lower volumes, you kind of get what you pay for. For a cheap system on easy to drive speakers, fine. I wouldn't expect hi fidelity but it plays. Next to a $300 Yamaha would have been more interesting, and revelatory as to capabilities.
13:47. You should try brown noise, very pleasing.
I would argue most people are not hung up about the measurements but more tuned into it's sonic merits and as a bona fide owner of Fosi V3 it more than punches above its weight in terms of sound quality (which is subjective I know, one man's meat is another man's poison etc.). Kudos to you, nevertheless, for not going with the main stream and putting your own unique spin on it. It's always good, someone can step back, and look at it with a fresh perspective :)
Thank you. Finally a serious scientific analysis. If you want a cheap amplifier for the desktop it's perfect. But it's not the game changer that makes the most expensive amplifiers go in the attic. If you want to fully listen to music you have to have a serious amplifier that is designed and built in a different way and which has a different cost. Most people follow the hipes inflated artificially.
Well said!
Fosi v3 must be really good to garner this kind of attention.
It's actually decent - especially sub $100. Can't play as loud as rated, minor issues with load dependency, but other than that - you're getting a great amp for the price.
I bought the V3 because it is cheap as chips and I thought would be useful around the house. As an experiment, I tried it with my LS3/5A sealed box speakers. It sounded fine, then, as a further experiment, I switched the V3 to an old Cambridge Audio A1 integrated amp, rated at 30wpc. The little old (26 year old) Cambridge drove the speakers perfectly and the sound was so much deeper and clearer, it was night and day difference. The V3 has its uses, but not for tough to drive speakers with big Ohm drops throughout the frequency range. It’s back in its box with its $100 tail between its legs (this was also using the 48v 5A brick.
Thanks for the comment. I think people are buying the Fosi because it's cheap, but when you can buy a Cambridge Audio A1 on EBay for under $100 - and it's a nice integrated amp with a four line in inputs (and a tape output) + a MM phono input, the idea that the Fosi is a bargain fails to meet reality. The cambridge is far more versatile and sounds better.
@@scientificaudiophile I think it’s popularity has been driven by a handful of enthusiastic reviewers and it’s form factor. Class D has certainly moved the needle in terms of desktop solutions but I agree 100%, a well maintained non abused integrated from as far back as the early 90’s for the same outlay will inevitably sound better with most other hardware.
I’m driving the fossi using elac ub5 85db sensitivity & dropping to 3.7 ohms. using a preamp I easily hit 85 dbs in a large room. audioscience said excellent headroom.
Yes. Just remember, music isn't pink noise.
I think Fosi simply copied and pasted the 300watt / 4 ohm rating from the chip manufacturers documentation but you are absolutely right that they should know better and give clear ratings for the different PSUs and also tell us what level of THD they were measured at. Not audiophile, indeed.
What is Audiophile, however, is sneering at such overblown claims and feeling superior to those lesser beings who believe them.
Audiophile is believing you know better than everyone else. Even other audiophiles!
@@scientificaudiophile "Make Audio Great Again!" It's a cult that rejects facts, science and anyone else's opinion. They claim super-hearing and anyone who doesn't agree with them 100% of the time must be deaf or pedestrian in taste.
Great review, thanks. I would like to better undestand these results. Did the dB levels at which the V3 struggled simply require more power than the amplifier allows ? I mean, could we predict these results based on your speakers impedance / sensitivity, and Amir's measurments (max. 89W with the 48V5A@8ohm), or is it about something more complex I have yet to learn ?
It's definitely more complex. I need to do more research, but I think class D is limited when the chip is overwhelmed by deep bass and a lot of it. Class AB and A are more robust.
@@scientificaudiophileThank you. Could the outcome also possibly be attributed to the fact that deep bass requires more watts per dB? Nevertheless, this explanation wouldn't align with the fact that the V3 catches up at 40Hz. I'm somewhat puzzled here, so please inform me if you come across any insights.
Your test show that a comprehensive understanding may require additional measurements beyond what is typically provided on ASR (for which I am already grateful)
@@scientificaudiophile Also, does the 89W maximum rating alone suffice to account for the amplifier limitations, aside from the bass issue?
Absolutely. A 1 kHZ tone, which is used as standard amplifier measurements doesn't require nearly as much power as a 20 hZ tone, but for years Class A, AB, etc amps have used such a test and the amps usually respond similarly throughout the audible spectrum. I'm going to be testing all amps, especially Class D, with white and pink noise going forward.
No, 89 watts is a decent amount of power, the limitations are in the design.
I wonder why audiophiles are so obsessed with 90 DB at 2m. I tried, and my whole family screamed at me. It was too loud for me too. I guess a real audiophile has a sound proof room (to avoid conflicts) and has lost hearing after going to too many rock concert.
Disclosure: I am more of a classical, jazz and folk music fan, and I listen to much lower DB levels.
Since I'm into organ music, I listen at lower volumes as well, but at greater distances. My room is actually 4 meters between my speakers and my listening location. So I need 4x the power to hit the same level as at 2m. 90 dB at 2m is only 84 dB at 4m.
believe it or not some people buy it connect it and listen to music
That’s crazy. Are you serious?
hi. what do you mean ,not really a pre out? can you connect stereo jack to twin rca to a power amp?
A pre out would allow you to control the volume. This is a line out, it simply sends the signal out. Volume can be off and it still sends the signal.
It sends the signal through at line level not being affected by the volume knob. It also does this with the amp off.
23:55. Now that's an interesting statement. Would have been a better video if you had spent the time proving that assertion. I'd like you to find a bunch of other ~$80 amps, with more features, that you then definitively demonstrate have the same or better audio quality to the Fosi v3. Otherwise, the v3 probably is providing you the best audio quality you can get for ~$80. Though form factor is an important consideration in many cases, but you mentioned that, so I'll table that objection.
You might like this amp: Aiyima A07 MAX - can it dethrone the FOSI v3?
th-cam.com/video/3eow80uGMMU/w-d-xo.html
@@scientificaudiophile Just watched that, it really does nothing to prove it's better than the v3. There are some very detailed videos hanging around showing the v3 destroying the original A07, perhaps the new Max edition can hang, though you didn't demonstrate that. I'm also curious about a number of other things, such as the Max's ability to faithfully and consistently recreate signal, a problem Aiyima has traditionally suffered with far more than Fosi has. So until all of the same sort of validation testing has been done on the Max, and considering Aiyama's less than stellar track record, I'm not prepared to think it's better based on a 5 minute long first impressions video. But if you want to do a detailed analysis, comparing the two, that would be something I'd find interesting, and I imagine a lot of others would too. Let's compare the components used, let's see how well they maintain signal integrity, how consistently they maintain their results on the same signal over multiple samples, which one over heats first, etc.
Great review!
Thanks!
Great review, my opinion you buy chifi you get chifi, which after spending time in China is standard operating parameters
the only ugly of this product is if you put 48v 10a into it, this amp would be so hot and possible burn, i have tried using meanwell, using 48v 5a it's save than 10a. For the rest, i think this tiny amp so good. Yes it hype, but in good way not bad. What fosi did is great. They hit hard in terms of budget oriented. Now i am thinking to push the budged into the output (speaker) not this source, because v3 is already make me step aside more expensive amp to drive expensive speaker.
I think you are mixing up "gain" and wattage @scientific audiophile
Not mixing up anything. This is a real world scenario. You can’t say your amp needs more gain than other amps to produce its wattage output. No one is going to add gain from their CD/turntable/etc before sending the signal to an amp. If FOSI screwed up the design of this amp they should have included a gain control.
@@scientificaudiophile what do you mean by gain control?
They have fixed a specific value for the feedback resistor which determines the gain of the circuit. The value is chosen for getting the optimum performance from the chip used. Changes to that value can introduce many issues like harmonic distortions and frequency response magnitudes accross the bandwidth.
There is no point in making comparisons with respect to gain. Every amplifier will be having different gain setting irrespective of the power rating.
PA systems which offer more than 3000w per channel has a gain level of only around 26 to 29 db which is very low even compare to fosi.
It doesn't mean that the amp is not powerful enough.
Gain and wattage are two different things.
Fosi doesn't have a pre section in the circuit, the opamps used are for making a differential stage input for the ic.
You can compare it with power amplifiers and then make a comparison.(fosi is actually a power amp)
There is no point in comparing it with an integrated amp which has a pre section in it in terms of gain
@@nishamnazar7005
Actually the TPA3255's gain is fixed inside the chip. Fosi (et al) have no say in it. They can use a pre-amp stage with gain if they choose, but the chip itself is locked at 21.5 db gain (12x voltage gain).
Great review. I have same set up v3 with 40V power supply. Sounds alright better than most of cheap classD but there is no way 300w not even 100w. I did turn all way up and still not loud enough. My Triangle Delta speaker around 92dB and tested in living room . 50W from vintage amp sounds louder than this.
Thanks for the info!
Congratulations. You've learned the difference between an integrated amp(specifically the preamp section providing over unity gain for the amplifier section) and just a plain amplifier with no preamp.
Your audio quality is so good i can clearly hear the difference between stoneware and china ;)
Mother was banging dishes instead of shining my shoes.
the yellow haired friend seem resisting
Best organ music - Satanic Ceremony (2013).
I think V3 is price much lower to any good amplifier below $500, it is at a fraction of that! If v3 sound nice at low to medium volume ,it is very good.
A bit confused by the harsh opinion on the Fosi v3. I've always owned fairly good audio (5 figures per component) and have a treated room. The Fosi v3 impressed me and held it's own against anything I've had in room. I tried it with low and high sensitivity speakers, both had great results. Can you point me to a room tour of your reference system and testing components?
10:36 th-cam.com/video/Fmhsg_SB3vs/w-d-xo.htmlsi=iezpY2pFzLKH4c4l
It's a tinker amp. Nothing can't be cured with more watt powersupply or opamp swap. You are comparing a 3k yamaha to a 100$ amp afterall.
At what distance was the testing done?
2 meters
i have two of these wired to a schiit syn surround preamp. the v3 hooked to my mains has sparkos chip improvements from a previously owned ayima amp. and i do have the 48v power supply. i don't mess with the volume knob much as i turn it to max and leave it and use my preamps remote for volume control. i get no noise, its quiet and so far sounds good. mine is wired to dual polk subs and polk es-20s.
It's a great amp if kept within its limits
I think you're comparing a $3,000 amp to an $80 amp. Obviously, these aren't apples to apples comparisons here. The real question is how does the amp compare to anything close to its price range. Yes, the marketing material is "optimistic", but this isn't Fosi's fault. Fosi has to compete against a bunch of other budget equipment suppliers, and they have to compare their device accordingly. You don't want to be the person supplying the one serious quality solution in the room, then use language that makes your product look worse than all of its direct competition (which Yamaha A-S2100 is not). It's an interesting video, that definitely highlights the difference between a budget solution, and a not so budget solution, but it really means little else I'm afraid.
I'm sure they sound good, especially with a better opamp, which they offer. I balk at the power ratings. And any amp that just states 1khz at 10% thd. MY ratings MUST say "20hz-20khz all channels driven and
I use the amp for headphones
You are using an amplifier capable of at least 100 watts for headphones?
Start saving up for hearing aids ... you're going to need them.
@@Douglas_Blake_579 I don't crank it up very high. I use it with two headphones, tungsons and t60rps. Tungsons you can play all the way up, it will get loud but not as loud as hd600s on a regular 2 watts per channel headphones amp at full power. The t60rps on the other hand, get very loud with it, I don't crank the volume on them very high, 50% at most. Maybe on an extremely quiet song a little more. My hearing is just fine, I promise you. I'm guessing that's because these headphones are high impedance, t60rps at 60ohms I think and the tungsons at like 115ohms.
@@alphabennyrosy5068
I do hope you take care of your ears. Have your hearing tested, at least.
Cheers!
@@Douglas_Blake_579 I have them checked regularly, I'm fine man. Believe me it's not what u think at all.
Just not good if you're reading off the screen😂
Love the wine rating. That’s exactly how I rate people by the products they consume. 😂
nice clear speaker imaging really
My concern is that you did not give the class D amp a 400 hour burn in period. Thats reasonable given the life span of that amp is likely 350 hours.
I'm not sure of the reliability of the FOSI, but a lot of the Toppings and other gear aren't holding up well.
You know, I have real problems with this video. I cannot replicate your "scientific findings." You made no mention of the cable risers used. You've made abundantly clear in the past how cable risers are critical to the sound output. Please do not omit such important details in the future! BTW, say hello to Helmholtz for me.
I thought by now it was common knowledge to use cable risers at 11 cm off a rug and 12.25 cm off a hardwood floor, unless it’s concrete then 14.5 cm. I think all of this is in Floyd Toole’s book as well.
Faulty unit?
No. The issue is these D chips are tested only at 1 kHz for wattage. Class AB designs are far more robust when handling both 20-20khZ white noise (e.g. they don’t lose as much power) and they can handle low voltage input better.
Okay ... some things that are NOT understood here.
The TPA3255 amplifier chip is *fixed gain* at 21.5db ... on the 48 volt power supply it needs at least 2 volts of input to reach clipping.
Most of the other stuff he's comparing to can clip on less than a volt.
The reduced power is a function of not enough input.
I have several TPA3255 based amps here... with 2 volts of input any one of them will hit 100+db (i.e. right freaking loud) on my pioneer towers.
By measurement...
With the 32 volt supply ... 55 w/ch both channels driven on 8 ohms with less than 0.1% distortion. 95 w/ch with on 4 ohms. 1.2 volts input to clip.
With the 48 volt supply ... 110 w/ch both channels driven on 8 ohms with less than 0.3% distortion. 210 w/ch on 4 ohms. 2.1 volts input to clip.
Moreover ... since the whole thing is fixed gain, setting a nice level on the 32 volt supply and then plugging in the 48 volt supply with no other changes... it will sound exactly the same. The only thing the bigger supply gives you is an extra 3 db of headroom.
The V3, A07 and their ilk are not "integrated amplifiers" they are power amplifiers with level controls ... and if you treat them as such they are perfectly capable amplifiers.
The TPA3255 chip was developed initially for pro-audio applications in studio monitors, sound reinforcement and public address uses. You will also find them in high end AVR systems and even high end stereo applications. But this kind of integration also comes with some pre-amp gain to ensure the chip is driven to clipping.
yea pretty much nailed it, the power supply which is one of the reasons it was crowd funded in the first place.
@@______4790
read that again.... it wasn't about power supplies.
@@Douglas_Blake_579 lmao
3.87k . YT thinks you're funny too.
Can you ask your mother to leave the dishes until after you've finished.
Her crashing about is distracting, and I need all my concentration for the data you are presenting.
I heard it as well in video editing and wanted to get it up. That women needs to learn when to do the dishes and when to shine my shoes!
😅😅 Naw, I think she's rather charming. I'm used to clatter in upscale coffee shops where I'm sometimes leisurely reviewing my Engineering subjects in my retirement.
@@robinkleinsteuber5217 I never said she wasn't charming. You must be used to performing data analysis in adverse environments, I must admit, I struggle.
"HiFi Made Fun." Fosi clearly doesn't understand HiFi and continues to perpetrate the myth that it's a hobby rather than a mental disorder.
I guessed box wine.
excellent point! Remember, the only sane people are the audiophile with mental disorders because we know nothing else matters. Thanks for the comment, and boxed wine would have been a great rating, especially if there is sparkling boxed wine.
So, this amp can't produce the famous bass tones of our dear Diana, when she flies with her delicate silvery shoes over the organ pedal? What a disgrace!
😂
My a-s2200 tells me that this was scientific!👌👍
Hell of an amp!
lul
OMG Einstein, a one hundred dollar microphone? Your coat probably cost 10 times as much. Where are your priorities?
I got my coat from a local homeless man for a bottle of Mad Dog 20 20.
@@scientificaudiophile 🤣🤣🤣, good one!! Split my sides!
Who would have expected otherwise? I have to believe the only reason you reviewed this amp is because it's the only one you could afford! Here's to hoping one day you have enough subscribers to review actual audiophile gear. 🤞 And the cheap audioman doesn't read right off the copy either.
Fair enough.
LOL Enjoy being misled..
Your glasses dont fit
They're not supposed to, they've got nothing to do with audio. Everything but sound is over rated and not worth the time to do it right.
I had a good look at Diane Bish...
That a dude?
DAN Bish??
Tis men is corrupt and tell's you fake....only for the money
Mate - a strange pet you are embracing !!!🥸!!!
Thanks
Actually I change my mind after reading the comments, your opinions are just like your jacket. Pretentious and inflated sense of self worth.