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Class D Switching Power Amplifiers and Power D/A conversion

Sonic impact t-amp problem/question.
Sonic impact t-amp problem/question.
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Old 6th August 2008, 02:25 PM   #1
doogyscoot is offline doogyscoot  United Kingdom
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Default Sonic impact t-amp problem/question.

Hi all, I appreciate it is possible that this has been covered in another t-amp thread but I have read quite few and can't find anything.
Just got one (gen1) as a beginner mod project, just the usual.
However, while it sounds pretty good as is I get the impression that the volume seems to drop a bit when say there is a fairly bass heavy part then more parts in the midrange come in. It's like the level of the bass just floats away a bit. It sometimes slowly seems to return to normal level. I think this is even happening at lower volumes but its harder to tell. The nearest thing I can equate it to is that thing you get if watching a live band outdoors from a distance and the wind comes along and blows some of the frequency range away, though not a pronounced maybe.

I'm still using a basic wall wart which only has 500mA to it so could this have something to do with it? I will be adding some decent sized tank caps too and running it off either a large battery or an SMPS. I'm hoping its just that the amplifier doesn't have enough readily available current to deal with more complex a and bass heavy sections and the future mods will resolve this. Did anyone else notice anything like this with theirs as stock?

My thanks in advance for your responses.

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Old 6th August 2008, 02:50 PM   #2
Nuuk is offline Nuuk  United Kingdom
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I'm still using a basic wall wart which only has 500mA
That's your answer!
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
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Old 6th August 2008, 03:05 PM   #3
doogyscoot is offline doogyscoot  United Kingdom
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Yeah, I kinda knew that was the obvious answer... I just wasn't sure that the low rated PS would cause the low end drift off at low volumes. I was worried it was something up with the amp as it's an ebay job. I actually have an SMPS which gives about 5A but I need it for a battery fast charger so I can't swap the connection on it.

Just wanted someone else who had used it with a crap PSU as standard to tell me theirs did the same.

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