Tripath 2021b with preamp. help!

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Hey all DIY people.

I dont know if this has been up befor, but i apologize if so.

Sum up: -Basically i'm asking about the maximum input levels for a tripath based amp?-

I have a smsl sa-s3 tripath amp. it's based on the 2021b chip.
I am generally very impressed, but since i need to use it with a wide variation of mp3 players, ipods and smartphones, the sound is not always loud enough.
I believe this is due to the low output signals from the devices, rather than the amp itself.

My solution was to build this pre amp to boost those output signals:
JFET iPod preamplifier

when i completed it, I measured about 350% gain of the signal. Maybe a little high, but i tried it out. unfortunately it fried the amp pretty fast.

Now i'm waiting for a new amp to replace the old one. i adjusted the preamp so the gain is down to 200% now. but i'm a little nervous that it's still too high.?

So basically i'm asking about the maximum input levels for a tripath based amp?

Thanks//Asbjørn
 
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