Active speaker mod and improvement.

Hi guy newbie here, I have some sony deep bass speakers that I fitted with a fenton intigrated amp from a spb8 400w, thinking that it would be enough for family karaoke parties, but sadly it doesnt preform well, the interphase is great it can read mp3 on both sd or usb, it has bluetooth to connect a phone or laptop, has seperate volume and echo for twin mics a simple tone control with seperate volume for music, but not a master volume control.
I also have a compact ish samson 260 w servo studio amp which runs the speakers beautifully, my plan is to steal a signal from the small amp to feed the samson input.
The fenton amp uses 4x tip41c transistors npn on 4 tiny HS. I'm guessing they use 1for music and number 2 for the mic feeding the left speaker and similar to feed right speaker, even though the heatsinks are small they do interfere with the tweeter horns and would be better shortened to be 'nice'. My question is should I pull the signal from the 5551 and 5401 driver transistors or reduce the collector voltage of the tip41c down to an acceptable level to feed the samson preamp. Sorry for the essay hope you are still awake !!
Thanks guys.