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Class D Switching Power Amplifiers and Power D/A conversion

Sonic Impact 5066 Parts List & Modifications
Sonic Impact 5066 Parts List & Modifications
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Old 20th December 2007, 08:01 PM   #601
Buckapound is offline Buckapound  United States
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If you're going to stick to the SI, changing out the reservoir capacitor (the electrolytic in between the inductors) to a higher value and better grade is well worth doing, and It's not a big deal to add a second, even larger cap on or very near the board. In my experience, this helps the bass as much or more than swapping input caps.

--Buckapound
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Old 28th February 2008, 08:44 PM   #602
dannyt is offline dannyt  United States
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Default Stealth modded with one channel sound less than the other

I just modded my SI with Stealth mod. by Panomaniac with a new Panasonic pot, everything work fine except right channel sound less than left channel. I change another new pot and nothing change. I trie to switch input cable around and now the left channel sound less than the right channel. Did I do something wrong here? I think I want to mention is I broke C12 when I removed the broad from two black pole holding the broad, I read somewhere here and that capacitor value is 0.1 uF so I replaced it with some 0.1 uF ceramic capacitor and hope it should work find but I really don't know this may caused the problem. This is my first modding project so please bear with me and give me some recomendation for fixing channel problem,
Thank you so much
Danny
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Old 28th February 2008, 09:08 PM   #603
Lostcause is offline Lostcause  United Kingdom
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Default Re: Stealth modded with one channel sound less than the other

Quote:
Originally posted by dannyt
I just modded my SI with Stealth mod. by Panomaniac with a new Panasonic pot, everything work fine except right channel sound less than left channel. I change another new pot and nothing change. I trie to switch input cable around and now the left channel sound less than the right channel. Did I do something wrong here? I think I want to mention is I broke C12 when I removed the broad from two black pole holding the broad, I read somewhere here and that capacitor value is 0.1 uF so I replaced it with some 0.1 uF ceramic capacitor and hope it should work find but I really don't know this may caused the problem. This is my first modding project so please bear with me and give me some recomendation for fixing channel problem,
Thank you so much
Danny
Hi Danny,
If the volume levels on the speakers changed when switching the inputs then it's your source thats the problem.
If you can switch the input around and the volume stays the same on the speakers then it's a problem with the amp......
Hope that makes sense
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Old 29th February 2008, 06:33 PM   #604
dannyt is offline dannyt  United States
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Thanks for response, so I think my SI is dead one channel. I have one more SI to try the mod. again and the broken one for part. Well this is first project anyways.
Thanks
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Old 29th February 2008, 11:11 PM   #605
soundphreak is offline soundphreak  United States
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I had a similar problem with low output from one channel and it turned out to be the pot. I think you mentioned you checked that out but just double check all your joints and splices etc...before you toss it.
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Old 1st March 2008, 09:25 AM   #606
audio1st is offline audio1st  United Kingdom
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Hi Danny,
C12 will not affect just one channel. As Lostcause said, the problem is probably your source. Could be the input cable is faulty?
regards..
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Old 28th March 2008, 01:58 PM   #607
Ree is offline Ree  Sweden
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Quote:
Originally posted by Lostcause


That's the cookie ringed in green.....
Hey! I thought you were supposed to bridge C3 and C4? Have I misunderstood something?

My board looks like this now:
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File Type: jpg 16989_2.jpg (71.2 KB, 578 views)
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Old 28th March 2008, 02:43 PM   #608
Lostcause is offline Lostcause  United Kingdom
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Quote:
Originally posted by Ree

Hey! I thought you were supposed to bridge C3 and C4? Have I misunderstood something?

My board looks like this now:
Hi Ree, that post was discussing the BIAS cap NOT the INPUT caps.
Your board looks good, nice bridging.
TTFN
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Old 28th March 2008, 08:30 PM   #609
Ree is offline Ree  Sweden
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Quote:
Originally posted by Lostcause


Hi Ree, that post was discussing the BIAS cap NOT the INPUT caps.
Your board looks good, nice bridging.
TTFN
Oh, ok. Those "remove" arrows just scared me a little Thanks, I thought it got a bit messy there, but I got the job done. This is a bit over my soldering skills really. But its fun

Anyway, I used a couple of 2200uF 25V electrolytic caps for the stealth mod. The music cracks and pops a great deal just after i turn the amp on, but after 15 seconds or so it sounds good. Is this normal? Could it be bad caps or something?
I used kind of weak unshielded internal cables, is this a problem somehow?

I've tried to get a grip around this C10 business.. What do I gain from replacing it? And could I use another 2200uF 25V for that? I also have 1000uF's of the same kind..

I'll post some more pics from my modding..
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Old 28th March 2008, 09:13 PM   #610
Lostcause is offline Lostcause  United Kingdom
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Quote:
Originally posted by Ree

Oh, ok. Those "remove" arrows just scared me a little Thanks, I thought it got a bit messy there, but I got the job done. This is a bit over my soldering skills really. But its fun

Anyway, I used a couple of 2200uF 25V electrolytic caps for the stealth mod. The music cracks and pops a great deal just after i turn the amp on, but after 15 seconds or so it sounds good. Is this normal? Could it be bad caps or something?
I used kind of weak unshielded internal cables, is this a problem somehow?

I've tried to get a grip around this C10 business.. What do I gain from replacing it? And could I use another 2200uF 25V for that? I also have 1000uF's of the same kind..

I'll post some more pics from my modding..
Wooooooah!!! Dude! NO!
Don't use those caps for the stealth mod on the input mate No wonder it pops and cracks
You only need 1 uf to 2.2 uf for the inputs
The 2200uf are for C10 replacement
And yes... the replacement of C10 is probably the best mod you can do to improve higher volume base response.

You need to recap more of this thread before you go any further.

Good luck

Lee
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