I have an early 80's boschmann pch-4480 sx amplifier in perfect working condition.Pic and specs are as below.I just wanna ask that new capacity subs and woofers are in market upto what capacity would my amp working perfectly and what price would be better if i wanna sell it
SPECS
Maximum Output: 900 watts, 4 channels
Low Pass Filter: 40Hz-150Hz
High Pass Filter: 80Hz-1.2kHz
Freq. Resp.: +1/-1 dB@ 5Hz-50kHz
Signal To Noise Ratio: >100 dB
Stereo Separation: >80 dB
Input Sensitivity: 200mV-3V
Input Impedance: 22k 0hms
Operation Voltage(Negative Ground): DC 12V
Speaker Impedance@Stereo Driven: 4 Ohms
Fuse Rating: 40Ax1
Dimensions: (W x H x D) 273 x 62 x 350mm
Amplifier Output
4-Ohms Maximum Output: 160W + 160W, 290W +290W @ 0.03%T.H.D.
4-Ohms RMS Output: 60W + 60W, 90W + 90W @ 0.03%T.H.D.
2 Ohms RMS Output: 85W x 4 Ch @ 0.01% T.H.D.
4-Ohms Bridged Output: 150W + 150W, @ 0.02% T.H.D