Depends on the amp's output power...

You need to look at the max current draw and get a supply accordingly.

I have an old 12V car amp rated for 70W per side.

So 140W is a hefty wall-wart. ;D

Also, look for pro-audio gear (like musicians might buy) vs. audiophile gear that guys who want to buy stereos with too much money in their pocket.

Most of the time, musician stuff can be had a lot cheaper.


-Ben