I have always loved the STK type amplifiers. They may be not audiophile-quality, but they have a certain powerful sound to them with a ton of bass. I have a Sony av570 receiver with an STK, and is has a full sound that is not in any way lacking in bass. It has dbfb dynamic bass sound setting that sounds incredible. The issues: combining dbfb and max bass setting result in clipping.
Great video btw.I have an Energy as90 sub with a circuit board issue, it powers up but then works intermittently. Was wondering if you know where (and if) there’s a replacement available 13:20
I have a Mirage Omnisub 10 I got on clearance from Tweeter (anyone remember them?) over 10 years ago. Use it every day, upgraded the A/V Receiver and the rest of the speakers a couple of times (now a Denon 2113 and the Pioneer Andrew Jones set) but the sub has always been more than enough. Denon's room correction set it to something like -9 dB and it still rattles the lightbulbs in some scenes. But I know it's calibrated because when I listen to music on the "Flat" profile, it is not boomy, the bass is just there all the way down to the lower limit of my hearing.
Tried to fix infinity 8" sub that was thumping power board was getting so hot the traces were delaminating around large band resistors.. amp plate housed in plastic box failed repair. It let out some smoke
@@jasejj The quality is actually very good. Consider that powered subs do take a pounding. Remember this specific unit is not a real high end model but well constructed. There are some very good speakers made in Canada. PSB and paradigm are 2 brands.
I have a Pro-liner sub I want take a swing at. Made in Canada, maybe? At least Head Quarters for the line is Vancouver based. Talk about noise. Mine is just noisy period. Tried other drivers, and the result is the same. The big Caps visually look good, but I ordered up some anyway. Now just educating myself on all the tips and tricks to see what else I can learn. The thing just gets some eerie static intermittently, enough that the auto switch turns itself on. AC filtering maybe? Just love these vids as I am a sponge to learn stuff. Fixed a few systems since my youth and now even more eager to do more, like breathing new life into a Sansui 350A just given to me. Will be a nice home unit on top my Roger’s Majestic AM/Phono cabinet. Hey, that Work-Safe BC was a dead give away. I am wondering what else may be made in Canada 😆
I wish I could fix my cerwin vega lw-12 it powers on but no sound so I used a old adcom amp and a f-mod for the cross over .is there anyway to still use the built in crossover on the cerwin vega amp some how but use the adcom for power? The sub in the box sound good still and I think klipsch makes energy subs I have two pairs of klipsch kg 5.5
Ok thank you, yes I did that already very carefully, it was bad, I couldn’t really trouble shoot it until I removed all that dust, I checked my power supply voltage at the big filter cap and it appears to have done 40 years worth and is shot, so now I’m trying to find another capacitor like the one that’s in there, it’s some kind of weird 4700uf 70volt cap with a dummy leg and your other typical connections, any ideas?, let me know what your thoughts are, no one has ever been in this amp but me, I would like to save it, good old realistic SA-1000 , its a nice little amp, it appears to be well made.
I have this same sub and when you adjust the low pass frequency it makes a loud scratchy noise. Can I clean the switch as you did to fix it or is it a different issue?
hey bud i have the logitech z623 and the4 sub suddently stopped working. No smells or bad noise. There is an amp insider the subwoofer can this blow and make the sub stop altogether? ty the sub still gets power as one of the small satellite speakers runs from d sub off the subwoofer itself. only the actually bass and subwoofer not working bud.
i agree MOST STK's weren't too bad. The main issue of the late 70's early 80's packs were there ability to dissipate heat. Which is why 4 Ohm loads were almost instant death for most.
Any chance you could tell me if you know ic that is sanded. I`m trying to replace mine in my as 180 subwoofer and dont know what to replace it with. Also do you have a circuit diagram even for the one above it would really get me out of trouble thanks
@@12voltvids - ya, I realized that after I wrote it. Been listening a bit to cfox and Jack FM but it's am 730 in the car. No, it's true... _Pinky swear_. :)-
@@EngineeringVignettes The traffic station. I rarely listen to that because I don't have to commute. In the car it is usually the fix or 101 during the day and 104 in the evening or 980 for the news.
The power module is rated at 60, and the voltage off the transformer is certainly high enough for 60. There is a higher power version of this sub as well with bigger caps.
Interesting power supply comment. We've seen bigger power supplies in some vintage higher quality class A preamplifiers, like that Dynaco you worked on. I know my solid state Bozak CMA-10 2DL six channel DJ mixer is close to 2A. It's a beast. It'd be one thing if that was a class D of some variety, but this is a run of the mill class A/B. It might be an H bias or G. Not sure, but it surely isn't going to punch its way through a heavy A/B class amp with real guts.
@@techguy127com4 How about the 120v charger for this one. The dummys in China that shipped me this unit sent it with a european 240v transformer. I have to use a step up transformer, so I can use the step down to charge.
For those who want to know, because i know your out there. STK4038X 60Wx1 8Ohm 0.008% THD (wow) Those extra filter cap footprints on the PCB make perfect sense as that module is pin to pin compatible with a whole line that ranges from 30W to 100W
Wife factor. She gets annoyed with all the racket so to keep peace I keep it turned way down. Haven't watched an action movie in months. For that matter i haven't watched any movies in months. Got a great home theatre that I just watch tv on.
Formula sound, a UK DJ audio company used to file off the chip numbers! I messaged them to show I was from a similar company and they gave out the numbers quickly!
There is more than enough cooling on the IC. Remember that this is a subwoofer. It is not running constantly like your main power amp would. DC speaker protection is built into the module, and if the outputs in the IC were to short, the power supply fuse would blow pretty quick.
You've got to feed the trolls, man. If you don't, they'll start complaining that there's nothing to complain about, lol. I can't honestly see what they have to complain about, tbh. Anyway, thanks for posting mate!
I love bass I guess you can call me a basshead haha. I watch some car audio videos on youtube mostly steve meade. I like when he hooked a singing card to a huge tower audio system.
Well I play the bass, or did. Bass was my thing but as I got older I started to appreciete the mid ranges. I have a pair of big speakers that are very accurate and really don't need any extra help in the bottom end.
At 8:52 is shown 120Volts and 2A, so it should be double of that. Maybe this 0.75 A is for 230V. But given the transformers size it is about 100W, and that 2A fuse blows only when there is dead short.
Maximum power that this whole sub can draw trough 2A is (2A x 110V) =220W. Power amp is 60W at NOMINAL (Sinusoidal) power at 1 Ch and 0.4% THD which means 120W at MAX volume under MAX % THD or MUSICAL (max listening) power around 90W under 10% THD. Nowhere near 500W :D
I have always loved the STK type amplifiers. They may be not audiophile-quality, but they have a certain powerful sound to them with a ton of bass. I have a Sony av570 receiver with an STK, and is has a full sound that is not in any way lacking in bass. It has dbfb dynamic bass sound setting that sounds incredible. The issues: combining dbfb and max bass setting result in clipping.
Great video btw.I have an Energy as90 sub with a circuit board issue, it powers up but then works intermittently. Was wondering if you know where (and if) there’s a replacement available 13:20
I have a Mirage Omnisub 10 I got on clearance from Tweeter (anyone remember them?) over 10 years ago. Use it every day, upgraded the A/V Receiver and the rest of the speakers a couple of times (now a Denon 2113 and the Pioneer Andrew Jones set) but the sub has always been more than enough. Denon's room correction set it to something like -9 dB and it still rattles the lightbulbs in some scenes. But I know it's calibrated because when I listen to music on the "Flat" profile, it is not boomy, the bass is just there all the way down to the lower limit of my hearing.
Mirage 12 inch (150 watts )similar that I have, fuse looks the same but loose . Thinking of making a new fuse holder ?
Tried to fix infinity 8" sub that was thumping power board was getting so hot the traces were delaminating around large band resistors.. amp plate housed in plastic box failed repair. It let out some smoke
wow - i like the magnet trick on your drill!
I'm wondering why the "Made in Canada" text was censored in the beginning.
You can guarantee if it said "Made in Mexico" Dave wouldn't be drooling over the unremarkable build quality.
i think he was trying to hide the serial number?
It was to see how many would assume it was made in china before I let the cat out of the bag.
Aparantly many!
@@jasejj
The quality is actually very good. Consider that powered subs do take a pounding. Remember this specific unit is not a real high end model but well constructed. There are some very good speakers made in Canada. PSB and paradigm are 2 brands.
I have a Pro-liner sub I want take a swing at. Made in Canada, maybe? At least Head Quarters for the line is Vancouver based.
Talk about noise. Mine is just noisy period. Tried other drivers, and the result is the same. The big Caps visually look good, but I ordered up some anyway. Now just educating myself on all the tips and tricks to see what else I can learn. The thing just gets some eerie static intermittently, enough that the auto switch turns itself on. AC filtering maybe?
Just love these vids as I am a sponge to learn stuff. Fixed a few systems since my youth and now even more eager to do more, like breathing new life into a Sansui 350A just given to me. Will be a nice home unit on top my Roger’s Majestic AM/Phono cabinet.
Hey, that Work-Safe BC was a dead give away. I am wondering what else may be made in Canada 😆
I wish I could fix my cerwin vega lw-12 it powers on but no sound so I used a old adcom amp and a f-mod for the cross over .is there anyway to still use the built in crossover on the cerwin vega amp some how but use the adcom for power? The sub in the box sound good still and I think klipsch makes energy subs I have two pairs of klipsch kg 5.5
Ok thank you, yes I did that already very carefully, it was bad, I couldn’t really trouble shoot it until I removed all that dust, I checked my power supply voltage at the big filter cap and it appears to have done 40 years worth and is shot, so now I’m trying to find another capacitor like the one that’s in there, it’s some kind of weird 4700uf 70volt cap with a dummy leg and your other typical connections, any ideas?, let me know what your thoughts are, no one has ever been in this amp but me, I would like to save it, good old realistic SA-1000 , its a nice little amp, it appears to be well made.
Why do the factory amplifier blowns the fuse ?
I have this same sub and when you adjust the low pass frequency it makes a loud scratchy noise. Can I clean the switch as you did to fix it or is it a different issue?
"Ya hear that? It could be in your walls and floor"....just as you mention the boominess of subs. What a coincidence.
Not in my walls. Floor is concrete walls insulated 2x6 construction.
@@12voltvids Very nice!
hey bud i have the logitech z623 and the4 sub suddently stopped working. No smells or bad noise. There is an amp insider the subwoofer can this blow and make the sub stop altogether? ty the sub still gets power as one of the small satellite speakers runs from d sub off the subwoofer itself. only the actually bass and subwoofer not working bud.
Stk amplifier modules don't seem too bad, the ones to avoid are San Ken as they fail too often :-(
Stk regulator modules in vcr's often fail.
i agree MOST STK's weren't too bad. The main issue of the late 70's early 80's packs were there ability to dissipate heat. Which is why 4 Ohm loads were almost instant death for most.
Good job Dave!
Quick job 👌
Interesting 🔉🎵
Let the trolls do their thing, they're just mad that you're the best diagnostic technician on TH-cam!
😁
Yherevaut in force this time.
Is that a 10amp slow blow fuse 🤔🧐
Any chance you could tell me if you know ic that is sanded. I`m trying to replace mine in my as 180 subwoofer and dont know what to replace it with. Also do you have a circuit diagram even for the one above it would really get me out of trouble thanks
On my energy 10 subwoofer I can't remove the panel after taking the screws out, how do I do it?
Hi I was wondering if you could help me with my definitive technology soundbar. It has a blinking white light
It's kind of funny listening to AM 730 on a sub woofer...
Nice fix, my subwoofer is gathering dust as well.
Cheers,
Actually it was cfox but....
@@12voltvids - ya, I realized that after I wrote it. Been listening a bit to cfox and Jack FM but it's am 730 in the car.
No, it's true... _Pinky swear_. :)-
@@EngineeringVignettes
The traffic station. I rarely listen to that because I don't have to commute. In the car it is usually the fix or 101 during the day and 104 in the evening or 980 for the news.
is there anything special about the contact cleaner you used? can i use the stuff i got at the auto parts store?
I use nutrol contact cleaner.
thanks, ill check that out
Do you work on 80's car stereos? If not who can you recommend?
No, don't work on car stereo. Never have.
@@12voltvids 12VOLTvids doesn't work on car stereo, oh the irony :)
@@RWL2012
The name was chosen more for the car I drive and the first videos were about the car.
@@12voltvids fair :)
The fuse is 0.75A and this works on 120V. I'd say 60W output power would be very generous. More likely 40W or less.
Looks nicely made though.
The power module is rated at 60, and the voltage off the transformer is certainly high enough for 60. There is a higher power version of this sub as well with bigger caps.
Interesting power supply comment. We've seen bigger power supplies in some vintage higher quality class A preamplifiers, like that Dynaco you worked on. I know my solid state Bozak CMA-10 2DL six channel DJ mixer is close to 2A. It's a beast. It'd be one thing if that was a class D of some variety, but this is a run of the mill class A/B. It might be an H bias or G. Not sure, but it surely isn't going to punch its way through a heavy A/B class amp with real guts.
My sub is made by reel never heard of the company but it's made in Canada.Missisaga 100w
I have a question , I was wondering what is the best way to clean heavy dust out of the inside of a solid state amplifier?.
+Tommy Sulkowsky - Do it with a compressed air gun the same way 12volts does...preferably outdoors.
Dave, you make some of the best repair videos on all of TH-cam, but those screw removals were painful ... Lol .. :-)
Painful? No, they came right out with the electric screwdriver! No effort at all.
@@12voltvids Ha ha ...and a good sense of humor. I think we're all gonna chip in and buy you a new battery for your birthday. :-)
@@techguy127com4 How about the 120v charger for this one. The dummys in China that shipped me this unit sent it with a european 240v transformer. I have to use a step up transformer, so I can use the step down to charge.
For those who want to know, because i know your out there.
STK4038X 60Wx1 8Ohm 0.008% THD (wow)
Those extra filter cap footprints on the PCB make perfect sense as that module is pin to pin compatible with a whole line that ranges from 30W to 100W
Correctamundo
Action movie with no bass....blasphemous! lol .love your videos!
Wife factor. She gets annoyed with all the racket so to keep peace I keep it turned way down. Haven't watched an action movie in months. For that matter i haven't watched any movies in months. Got a great home theatre that I just watch tv on.
No SMD components 😊 dual bobbin transformer... Looks well made. Shame about the sanded op amps and the low quality switches though.
Formula sound, a UK DJ audio company used to file off the chip numbers! I messaged them to show I was from a similar company and they gave out the numbers quickly!
Yep these are built to a price.. Not enough cooling on the heatsink... No dc speaker protection..
There is more than enough cooling on the IC. Remember that this is a subwoofer. It is not running constantly like your main power amp would. DC speaker protection is built into the module, and if the outputs in the IC were to short, the power supply fuse would blow pretty quick.
You've got to feed the trolls, man. If you don't, they'll start complaining that there's nothing to complain about, lol.
I can't honestly see what they have to complain about, tbh.
Anyway, thanks for posting mate!
Do you have a new audio setup?
What would give you that idea.
I love bass I guess you can call me a basshead haha. I watch some car audio videos on youtube mostly steve meade. I like when he hooked a singing card to a huge tower audio system.
Well I play the bass, or did. Bass was my thing but as I got older I started to appreciete the mid ranges. I have a pair of big speakers that are very accurate and really don't need any extra help in the bottom end.
You could always watch movies with some big headphones on?
0.75A slow-blow fuse, 120*0.75 = 90, so at most 90W continuous or the fuse would blow. And I doubt it can even do that.
At 8:52 is shown 120Volts and 2A, so it should be double of that. Maybe this 0.75 A is for 230V. But given the transformers size it is about 100W, and that 2A fuse blows only when there is dead short.
I bought the bigger version of this sub as180
Maximum power that this whole sub can draw trough 2A is (2A x 110V) =220W. Power amp is 60W at NOMINAL (Sinusoidal) power at 1 Ch and 0.4% THD which means 120W at MAX volume under MAX % THD or MUSICAL (max listening) power around 90W under 10% THD. Nowhere near 500W :D
I think the clue is in the model number as90 as in 90 watts.
I suddenly want to check my place for asbestos now.
If only people really know most audio equipment pass off as 3 digits wattage is actually 2 digits Most likely 30 yo 40 watt
Turn that thing Down! A familiar instruction to be obeyed...
OCD made me stop watching the video after the screws stuck on the shaft of the screwdriver. Sorry, great video anyway! :)
Do we really want to hear about your ocd. No! If you can't handle screws stuck to a magnet then you need some serious professional help.