First off is a Jensen XA2100. Looking for $30 shipped. Here are features and specs.
stereo or bridged mono output
Tri-way capable (Tri-Way Crossover required)
50 watts x 2 at 4 ohms
83 watts x 2 at 2 ohms
150 watts x 1 in bridged mode
requires 10-gauge power and ground leads — wiring and hardware not included with amplifier
speaker-level inputs
high- and low-pass crossovers, variable from 40-240 Hz, 12 dB/octave
6 dB bass boost at 45 Hz
preamp outputs
MOSFET power supplies
gold-plated screw terminals and RCA inputs and outputs
speaker short, thermal overload protection
8-1/2"W x 2-1/2"H x 11-1/8"D
Next is an old school bostwick. MA-250xz. It has scratches here and there from installs, but works good. $50 shipped
° 55W x 2 @ 4 20-20 kHz @ .04% THD
° 80W x 2 @ 2
° 150W x 1 @ 4
° 18dB/Oct, 80 Hz LowPass Crossover
° 12dB/Oct, 110 Hz HighPass Crossover
° 1/ 2/ 3 Channel Operation
° Extremely Stable Bi-Polar Power Supply
° Discrete Bi-polar Output Stage
° EMI, SVRR, DC-DC Power Supply Filters
° 250 mV to 7 Volt Input Range
° 10 Hz to 35 kHz Power Bandwidth
° >100 dB Signal to Noise Ratio
° Gold Plated Terminals
stereo or bridged mono output
Tri-way capable (Tri-Way Crossover required)
50 watts x 2 at 4 ohms
83 watts x 2 at 2 ohms
150 watts x 1 in bridged mode
requires 10-gauge power and ground leads — wiring and hardware not included with amplifier
speaker-level inputs
high- and low-pass crossovers, variable from 40-240 Hz, 12 dB/octave
6 dB bass boost at 45 Hz
preamp outputs
MOSFET power supplies
gold-plated screw terminals and RCA inputs and outputs
speaker short, thermal overload protection
8-1/2"W x 2-1/2"H x 11-1/8"D
Next is an old school bostwick. MA-250xz. It has scratches here and there from installs, but works good. $50 shipped
° 55W x 2 @ 4 20-20 kHz @ .04% THD
° 80W x 2 @ 2
° 150W x 1 @ 4
° 18dB/Oct, 80 Hz LowPass Crossover
° 12dB/Oct, 110 Hz HighPass Crossover
° 1/ 2/ 3 Channel Operation
° Extremely Stable Bi-Polar Power Supply
° Discrete Bi-polar Output Stage
° EMI, SVRR, DC-DC Power Supply Filters
° 250 mV to 7 Volt Input Range
° 10 Hz to 35 kHz Power Bandwidth
° >100 dB Signal to Noise Ratio
° Gold Plated Terminals
