here are some specs
1000hca:
2 Channel High Current Power Amplifier
RMS Power Rating: 3000 watts x 1 chan. at 1 Ohm Mono
RMS Power Rating: 1500 watts x 2 chan. at 1 Ohm Stereo
RMS Power Rating: 900 watts x 2 chan. at 2 Ohms Stereo
RMS Power Rating: 500 watts x 2 chan. at 4 Ohms Stereo
Hour Meter to log amplifier usage
Remote mount Bass Remote control included
Remote mount Digital Voltmeter included
ANL gold-plated Fuse Holder included
Heavy duty heat sink
Beveled clear acrylic protective cover
Tiffany-Style input and output RCA jacks
High speed switching power supply
Double-sided glass epoxy circuit board
S/N Ratio: >100dB
Frequency Response: 5Hz-50kHz
Variable low pass filter: 50Hz-250Hz
Variable high pass filter: 50Hz-250Hz
Variable subsonic filter: 15Hz-60Hz
Variable bass boost at 45Hz: 0~+18dB
Variable phase shift: 0~180 degrees
Input sensitivity: 200mV-8V
Input impedance: 10K ohms
4-Way protection circuitry: thermal, short circuit, overload, and DC offset
On board hook-up terminals
Dimensions: 26"L x 9"W x 2-5/8"H
pma 4075:
Amplifier Type - Multi Channels
Bass Boost
Bridgable
Power Output
RMS Power at 2 Ohms - 120 W x 4
RMS Power at 4 Ohms - 75 W x 4
Frequency Response - 5 Hz - 50000 Hz
Low - Pass Frequency - 50 Hz - 250 Hz
High - Pass Frequency - 50 Hz - 250 Hz
Signal to Noise Ratio - 100 dB
Bass Boost Frequency - 45 Hz
THD at Rated RMS Power - .05 %
Width - 8.25 in. Depth - 21.25 in. Height 2.63 in.
MOSFET amp
q2150:
2-CHANNEL CLASS A/B
BI-POLAR AMPLIFIER
50 Watts x 2 @ 4O Stereo
75 Watts x 2 @ 2O Stereo
150 Watts x 1 @ 4O Mono
Dimensions (W x H x L) 9 1/4 x 2 x 6 3/4”
Bridgeable
High Level Inputs
Low Level Inputs
MOSFET High Speed Switching Power Supply
Variable Low-Pass Filter: 50Hz~250Hz, 18dB/Octave
Variable High-Pass Filter: 50Hz~250Hz, 18dB/Octave
Variable Bass Boost @ 45Hz: 0 ~ +18dB
Variable Phase Shift: 0~180¾
Variable Subsonic Filter: 20Hz~60Hz, 18dB/Octave
Solid Brass Nickel-Plated Terminal Blocks
Milspec Double-Sided Glass Epoxy Circuit Board
Tiffany-Style RCA Jacks
4-Way Protection Circuitry: Thermal, Short Circuit, Overload & DC Offset