Sveiki, apie stiprintuvus nusimanau labai mazai, todel reiktu jusu patarimu.
Subas Punch P112S4 150RMS :

12" 4-ohm subwoofer
frequency response: 20-200 Hz
power range: 50-150 watts RMS
peak power handling: 300 watts
sensitivity: 86 dB
top-mount depth: 5-3/8"

Galvoju apie monobloka-kaina ~250lt.
Dekui.