Sold Rockford 501X

alpinetypeR
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501X Rockford amp...

* 65 watts RMS x 4 at 4 ohms

* 125 watts RMS x 4 at 2 ohms

* 250 watts RMS x 2 at 4 ohms in bridged mode

* 2-, 3-, or 4-channel output

* 4-ohm stable in bridged mode

* Tri-Way capable

* requires 8-gauge power and ground leads wiring and hardware not included with amplifier

* front and rear switchable high-pass (120 Hz, 12 dB/octave) and low-pass (80 Hz, 12 dB/octave) crossovers

* MOSFET power supply and output devices

* Maximum Efficiency Heat Sink Application (MEHSA) mounting technology increases the heat transfer from the MOSFET output devices to the heat sink, for higher power output, lower operating temperatures, and greater reliability

* TOPAZ noise-killing differential inputs that eliminate 80% of ground loop noise

* Transana circuitry keeps preamp voltages low and signal paths simple for outstanding audio quality

* NOMAD advanced protection circuitry for "intelligent" shutdown protection

* speaker- and preamp-level inputs

* preamp outputs

* 12-1/16"W x 2-3/8"H x 9-7/8"D

100$+shipping

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The X series from what I have seen is a beefier version then the regular 500 watt RF amp. Looking at their internals that is.
I think X stands just for 4-ch amp, S - for 2ch, for Punch/Power amp of that year

Beefier version, were marked like 551S, 551X and very rare. With blue labels.

Bump for an awesome amp.

 
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alpinetypeR

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