http://www.rockfordfosgate.com/scrip...ted=1083265782
thats what i found... pdf... excerpt from page 10
SPECIFICATIONS
MODEL PUNCH 301M
Maximum Power Rating
All Channels 900 Watts
Dynamic Power Rating - Measured at 14.4 Volts
Mono into a 4Ω Load 150 Watts
Mono into a 2Ω Load 300 Watts
Signal-to-Noise Ratio >100dB A-weighted
Crossover Slope 12dB/octave Butterworth
Crossover Frequency variable from 50Hz to 250Hz
Crossover Type variable AP/LP
Dimensions: (with Endbell)
Height 2.38" (6.05cm)
Width 9.85" (25.02cm)
Length 12.07" (28.12cm)
Frequency Response 20Hz to 20kHz ±0.5dB
Bandwidth 10Hz to 100kHz ±3dB
Damping Factor @ 4Ω (at output connector ) >200
Slew Rate 30 Volts/ms
IM Distortion (IHF) <0.05%
Source Unit Compatibility (+15dB gain overlap) 17V max. (low level in)
Acceptable Signal Voltage Range Variable from 100mV to 6V (RCA Input)
Variable from 0.5V to 11V (High Level Input)
Protection NOMAD - Internal analog-computer output protection
circuitry limits power in case of overload. Thermal
switch shuts down the amplifier in case of overheating.
Battery Fusing Rates (External to Amplifier) 30 amps
Fuse Type ATC
Equalization (Punch Bass) Switchable from 0dB to +6dB to +12dB
Input Impedance 20k ohms