Rockford Fosgate's Punch 500S amplifier backs up your speaker's bark with some vicious bite — 125 watts RMS by two channels! Proprietary TOPAZ noise-dampening technology and TRANS•ana circuitry bring ultra-clean power to your music, while Maximum Efficiency Heat Sink Application (MEHSA) shunts heat away from the MOSFET output devices for cool-running operation.

Variable high-pass/low-pass crossovers (50-210 Hz at 12 dB per octave) keep unwanted frequencies away from speakers not designed to handle them. When you need to put more growl into your lows, the Punch 500S features a wired remote control for Punch Bass — dial in up to 18 dB of bass boost from the comfort of your driver's seat.

Speaker- and preamp-level inputs allow you to get signal from any receiver, factory or aftermarket. If space is an issue in your vehicle, you can remove the amp's endcaps for a wider range of installation options.

Details:

  • stereo or bridged mono output
  • Tri-way capable (Tri-Way crossover required)
  • 125 watts RMS x 2 at 4 ohms
  • 250 watts RMS x 2 at 2 ohms
  • 500 watts RMS x 1 at 4 ohms in bridged mode
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • variable 50-210 Hz high-pass/low-pass crossover, 12 dB/ octave
  • TOPAZ noise-killing differential inputs eliminate 80% of ground loop noise between the head unit and the amp
  • NOMAD advanced protection circuitry monitors temperature, voltage, current and impedance, and provides "intelligent" shut-down protection without limiting system performance
  • TRANS•ana circuit designs keep voltages low and signal paths simple in the pre-amp section, for minimum distortion and maximum musicality
  • MEHSA provides more efficient transfer of heat from MOSFET output devices to the heatsink for cooler operation
  • speaker- and preamp-level inputs
  • Punch Bass boosts bass up to 18 dB at 45 Hz (wired remote control included for fingertip control)
  • dimensions: 13-3/8"W (9-15/16" without endcaps) x 2-7/16"H x 9-7/8"D
  • 2-year warranty

Hands-on research

What's in the box?

Download owner's manual

  • 2-Channel amplifier
  • RF center badge
  • Remote Punch Bass control
  • 15' Remote Punch Bass cable
  • Remote Punch Bass mounting bracket
  • Two 3/8" self-tapping screws
  • Self-adhesive Remote Punch Bass control decal
  • Remote Punch Bass control knob
  • One 9" speaker-level input harness
  • Twelve 3/32" Set screws
  • Four 3/4" self-tapping screws
  • One 7/64" Allen wrench
  • One 3/32" Allen wrench
  • 1 In-line 4/8 gauge fuse holder
  • One 50-amp AGU fuse
  • Installation and Operation Manual
  • Punch Verification Certificate
  • "Team RF" sticker

Product Research

Features
Controls
Inputs and Outputs
Specifications

Features

Trans-ANA (TRANSconductance Active Nodal Amplifier): The Trans-ANA is a circuit that allows the audio signal to pass through the amplifier at low voltage. The signal is directly level-shifted to the fixed high voltage rails via a pair of drive transistors. Signal linearity is assured by an active node formed  by the drive transistors at ultrasonic frequencies. The result is crystal clear sound quality, even at high volume levels.

MEHSA (Maximum Efficiency Heat Sink Application): MEHSA is a Rockford Fosgate proprietary process that increases the heat transfer from the MOSFET devices to the heatsink. The multi-layer insulated metal MEHSA substrate operates with minimal thermal resistance, spreading heat both downward and outward to quickly dissipate heat from each device across the heatsink. This allows greater power output, enhanced thermal stability, and maximum reliability.

TOPAZ (Tracking Operation Pre-Amplifier Zone): TOPAZ is a circuit that simply eliminates noise. The TOPAZ circuit allows the amplifier ground to move with the source unit ground, creating a "noise elimination" zone just before the preamp section. If there is any noise in the ground coming down the RCA line to the amplifier, TOPAZ amazingly tracks it down and eliminates it. The result is a 30-40dB improvement of the isolation between input ground and chassis ground. 

DSM (Discrete Surface Mount): In the manufacturing process high speed robotics are used to place 0% tolerance resistors and large board traces providing greater reliability and efficiency.

NOMAD (NOn-Multiplying Advanced Decision): NOMAD is an intelligent protection circuit that uses an analog computer to make real time decisions regarding temperature, voltage, current and impedance. The unit is protected without limiting sound output unless needed.

INDIGO (INDexed Ideal Gain Operation): INDIGO is a circuit that maximizes the output power of the amplifier by making better use of the power supplied by the car. As the battery voltage drops, INDIGO tightens up so the amplifier delivers the rated power, resulting in more consistent power coming from the amp.

Internal Crossover: The internal crossover is a 12dB/octave Butterworth filter variable from 50Hz to 210Hz. The crossover may be set for high-pass, full range, or low-pass operation.

Remote Punch Bass: The Punch Bass feature helps correct for acoustical deficiencies in the listening environment by helping reproduce full range sound without adding excessive boost. The Punch Bass control has a narrow band adjustment centered at 45Hz, variable from 0dB to +18dB. Using the mounting bracket, the supplied Punch Bass wired remote can be mounted in any convenient location under your vehicle's dash. The wired remote is 2.317" wide, 1.523" tall and 2.035" deep. The included cable is 15' in length.

RF Center Badge: Upon arrival, the RF center badge is not adhered to the amplifier. For installation flexibility, the badge can be rotated 180 degrees. Once you've decided in which direction the badge looks best for your installation, the peel-and-stick backing on the badge can be used to attach it to the amplifier.

Controls

Left Side Of Amplifier:

  • Crossover Switch: allows you to select high-pass, full range, or low-pass crossover operation
  • Crossover Frequency: the crossover frequency control is variable from 50Hz to 210Hz
  • Left Gain: this variable gain control allows you to adjust the output level of the left channel
  • Right Gain: this variable gain control allows you to adjust the output level of the right channel

Inputs and Outputs

Left Side Of Amplifier:

  • Input: gold-plated RCA jacks
  • High Level Input: Molex plug input for included harness
  • Speaker Outputs: gold-plated set screw terminals that will accept up to 8 gauge speaker wire
  • Remote Punch Bass: RJ-14 jack for use with supplied Remote Punch Bass wired remote

Right Side Of Amplifier:

  • GND (ground): gold-plated set screw terminal that will accept up to 8 gauge wire
  • B+ (power): gold-plated set screw terminal that will accept up to 8 gauge wire
  • REM (remote turn-on): gold-plated 0.250" quick-slide for remote turn-on lead. Note: A female quick-slide is not supplied.

Specifications

Dynamic Power Rating (measured at 14.4V):

  • Bridged Into A 4-Ohm Load: 500 watts x 1
  • Per Channel Into A 2-Ohm Load: 250 watts x 2
  • Per Channel Into A 4-Ohm Load: 125 watts x 2

Dimensions:

  • Without Endcaps: Height=2.489", Depth=9.8125", Width=9.8125"
  • With Endcaps: Height=2.489", Depth=9.8125", Width=13.375"

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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