วีดีโอ

Thank you for the video. I am building a L12-2 amplifier and your video was great motivator

The Alpair is a totally different construction to the Pluvia. The Pluvia being traditional construction with dual suspension and the Alpair being a spiderless mono hung construction suspension. So the Pluvia is not a replacement for the Alpair, it is a different speaker technology. I don't think they should be mixed as their specifications are different in many areas. The bezel you note, in the Alpair is beveled that is because of a wider dispersion as the centre cone is at the same level as the suspension as a difference example. However I believe they could be considered a replacement in pairs left and right.

You must know my sister in law she is always wandering around with a big knife in her hand and needs to waggle it around it to enable her to talk.

Sir, please DM me. I am willing to pay for a passive crossover schematic

you are Laverda on PFM , nice to know

Ok, this is my next build!

Very nice! I am also a DIY open baffle builder. Any chance you can share, measurements, parts list and xover schematic?

The 620hz EQing did not work because you applied the EQ to the 15", instead of the mid driver. Also, why would you leave the mid without a low cut? I only see potential phasing and image blurring problems. Many thanks for such a video. I love to be able to follow your train of thought cause I'm a total newbie in diy speakers

Much thanks for your video. Do you know how much power the ASR2 draws?

Thanks for the great video. The one thing I’d recommend is not running the input and output wires together. This couples ac and pulsating dc to the regulated clean voltage as it runs back to the output terminals.

Hi mate great video it would be beneficial if you told the viewer what the devis does here is what I read at avondale The sections in all NACs have a crude form of filter to prevent regulator noise from entering the system. It consists of a 27 Ohm resistor in series with the DC supply and a 47 Microfarad electrolytic capacitors across the resultant 24V DC supply. It works to a degree but as with all RC - Resistor/Capacitor networks, it is frequency dependent - it favours certain bands in other words. The network also introduces a resistance against the incoming supply - one of the characteristics of this simple strategy so softening transients and removing details. The gyrator has fewer problems than the RC network and enables the sections of the pre-amp to work more efficiently having been given a low impedance DC supply from which to draw current. Pictured is the 27 Ohm resistor and the 47uF capacitor in question - there are a number of these networks in the NAC. For instance, the humble 42 has four such networks - discounting any phono cards - the more involved NACs may have more. Newly revised to a smaller format - 25 X 20mm to enable fitting in more confined spaces - same stunning results from this micro miracle.

Is there a template for this? Thanks

The wood is the expensive part.

Thank you - great work

Good 170s and 74s are very hard to find

Really great work

Did you have to change anything in the crossover when you converted from Trio 15 to Duet 15?

I love this amp. Such a trick circuit with the trafo switcheroo

I finished this kit a few days ago and am enjoying it. It plays very well with my Revel Performa M22 speakers (87dB sens). It replaces an Rotel RB-1070 power amp. Initial thoughts are I prefer the Hypex for low to medium volume listening (rich and detailed, esp bass notes) and the Rotel for high volume devil worship sessions. 😁

What do you think is better for upgrading Nac 62 or Nac 72?

Those Oscon cap leads used to tarnish badly.

Do you have a link for those PCB boards?

Roger dodger

I love it when somebody tells me it will be worth it, they are usually wrong... But you are not in this case. Glad I clicked on your video we'll be subscribing and liking and all that good stuff.

I'm going down the OB rabbit hole as I type this. Starting with the W8-1808's and the Alpha 15's. Have you tried any of the other eminence woofers, other than the Alpha 15's ?

"I am in no way, shape or form a carpenter." Well sir, my warmest compliments on your accomplishment.

main reason not to leave any CDP powered up 24/7 that uses this classic multibit dac , first thing that goes is the OSC giving that static noise after its warmed up . Its worth heat sinking these chips

Thank you for this, actually it's up to you to please choose if you want to communicate with those lacking some technical knowledge or not, I prefer some more detail and instead feel like turning of when I again hear the basics. At 12 min you do well explaining things in a basic fashion and for those that need that it's all well and good. But probably aim your channel more for one or the other. some prefer an introduction, others, like myself have long since gotten bored with basics. thank you again

Thank you

Here I'll add my thanks to you Graham for your deliberations and kind comments. We did indeed make around 30 pairs of the ReV Ones and a similar number of the ReV Two. The company I formed to make them - RMS Ltd, was financed from my endeavours as Avondale Audio and as such, had a finite limit. At the time, we made product for Stands Unique of Northants but when the owner retired to sunnier climes, a major source of income dried up so RMS had to close. I've since made several prototypes of an improved ReV using carbon fibre and CNC machined alloy baffles for the casework - they sound even better then the original models and have an uncanny ability to disappear. A few details I forgot to mention to you Graham: The carbon fibre tube inside the 'leg' is pre-tensioned by a stiffening rod tensioned to raise the frequency at which it responates. This tuned tube won't transmit bass energy down its length & the sprung foot rejects bass energy going into the floor - bass that's lost forever as music. Add to this formula the carbon fibre decoupled spikes and the bass energy has nowhere to go but into the room. The problems I encountered with this design were that it was too revolutionary in appearance and secondly, I had no budget for marketing.

What is capactor

Hi, new subscriber here! Is Voxativ full range driver used in the pure audio project duet 15 better than Tang Band 1808?

Dear Sir I would like to know what transformer to replace the present transformer in order to operate at 230V.Thanks

Well done, tho

Nice one, thanks for the video

Nice. How about passing the old boards on.😉

Interesting. I’ll take those old amp and power modules off your hands if you like.😉

Great video sir! Im a new fan!

Hi Do you mind just re-listing the caps and the voltages. The lower right red cap you didn’t mention the voltage. Thanks Also i have 2 similar boards, not sure the model but layout the same except the transistors are fitted to the pcb. All the transistors test as ok including main output ones, but i know one or two could still have a fault. I’m getting high voltage pretty much every on the board ,speaker terminals and even the inputs. Both boards have same issue. Any help would be appreciated please. Thanks

700 big deal . i see 5.7k. 700 to 5.7k that makes my crossover points. Weird Audiokarma .

How do you know its an upgrade ? Do you do measurements after the modification ?

I’m just getting into modifying my Naim equipment and your videos are proving very beneficial. I have an old Nait 3 which I intend to experiment on inspired by the mods I’ve seen on your channel. I’ll do one mod at a time checking out the differences each time. So please ignore the naysayers and keep up the video production! 👍

BS does not provide any info about FR/phase/distortions. Are they so really bad I wonder? Thanks

good effort

Two slight corrections rather than bad mouthing. Firstly, ordinary rectifiers are silicon, not ceramic. Secondly, the output of a full-wave rectifier is not a squarewave, but a 'lumpy' DC either negative or positive, ready to be smoothed into a flatter DC, by the big capacitors. I like your mod to the solder sucker - I'll try that.

Thank you for the educational experience, as always I appreciate your candid honesty with all these videos.

What's it supposed to do then why is it better?

I have this exact problem with mine. Its out of warranty so I will give this a try. Thanks for uploading this as it seems like its possibly a common issue. If it was still under warranty it would be going back to them.