Specs on these amps:
http://www.phoenixgold.com/webfaq/ZX.htm


ZX200/ZX250 SPECIFICATIONS:

Output Power:

4 ohm stereo @ 12/13.8 VDC
18/75 WRMS x 2

2 ohm stereo @ 13.8 VDC
150 WRMS x 2

4 ohm bridged @ 13.8 VDC
250 WRMS x 1

Crossover Frequencies (ZX250 only)
30 to 600 Hz

Crossover Slopes
24dB per Octave


ZX350 SPECIFICATIONS:

Output Power:

4 ohm stereo @ 12/13.8 VDC
37/100 WRMS x 2

2 ohm stereo @ 13.8 VDC
200 WRMS x 2

4 ohm bridged @ 13.8 VDC
400 WRMS x 1

Crossover Frequencies
30Hz to 600 Hz

Crossover Slopes
24dB per Octave

ZX500 SPECIFICATIONS:

Output Power:

4 ohm stereo @ 12/13.8 VDC
75/150 WRMS x 2

2 ohm stereo @ 13.8 VDC
300 WRMS x 2

4 ohm bridged @ 13.8 VDC
600 WRMS x 1

Crossover Frequencies
30Hz to 600Hz

Crossover Slopes
24dB per Octave