Hello.

Heathkit stereos from the 60s were not all that hot.
This is due to the fact that early transistor designs were not all that good.
Even a cheap stereo system for a TV now is much better.
And car audio is now at the point to where that is where it is at, 1200 watts rms is no longer uncommon.
300 watts rms is pretty much the norm for an amplifier.
http://www.walmart.com/cp/car-amplifiers/39008