Jazzy you start a speaker thread la.

iamyuanwu, all you need are:
- a separate PSU 12VDC, even small wall wart 200mA also will do. But for better performance 1-5A
- a stereo volume pot or a pre-amp with volume control. I have good experience with 100k than 20k pot.

The lighternote cost more than the t-amp, but it really sound good. Someone mention lighternote don't work with active preamp, you need to test it.

My MeanWell SMPS give out some noise after use for few months, I guess most switching power supply do produce bzzzz............
It would be better if you can use a 150VA toroidal transformer with 9Vac secondary and after bridge rectify will give out about 13Vdc. I have that in mind but not yet done anything about it.

Different people different taste, I like fine stranded copper cable more than solid core, it is more flexible to install. IMHO that short distance inside amp wouldn't affect that much unless you have a golden ear, there are some expansive CDP used computer ribbon cable in signal path. You go figure is it worth the money or not.

If you want cheap solid cable, can try CAT5. If you want thicker can combine a few together. Great sounding cheap cable. Only thing I don't like is: very inflexible and the sleeving easily tone and puncher by heat.

It is tinned la for that price. Silver coated easily 20x more.

That is attenuation, wiki for it and you will know why the phone signal drop.
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There is some article about mass damping by using sand bag, but it work more on CD player where you have vibration. I personally didn't try it yet but looking at the different beans fill-up the amp or power inlet really

People say cable is voodoo, I think this is more voodoo. But if you can hear it why not?