The award-winner

Winner of an esteemed CES Design and Engineering Innovation Award, the FPD 600.4 amplifier is more proof that Focal is a world-leader in audio technology. This unobtrusive 4-channel amplifier will give your system a clean, powerful boost while keeping the current draw low, making it a wise choice for pure electric cars and for micros like Smart Car.

Keep your options open

You can drive two pairs of speakers with up to 200 watts RMS each in 4-channel mode, or switch to 2-channel mode to drive a pair of subs with 400 watts each. In 3-channel mode, you can power a set of speakers and a subwoofer, and Focal includes a wired remote for adjusting the sub's level from the front seat. Whatever you decide, you can use the amp's high-, low- and bandpass filters to optimize your system's performance.

When size matters

The amp's compact aluminum chassis disperses heat with incredible efficiency, so you can mount it in tighter quarters than usually recommended for the average amp. It's not much bigger than a standard text book, so its stashability factor is high, making it a convenient choice if space is an issue. And if you're keeping your factory radio, the amp automatically detects and converts the high-level signals from your speaker wires.

front-mounted controls


  • Class D 4-channel amplifier
  • 150 watts RMS x 4 at 4 ohms (200 watts RMS x 4 at 2 ohms)
  • 400 watts RMS x 2 at 4 ohms in bridged mode (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • high-, low- and bandpass crossovers: 50-4000 Hz (12dB/oct.)
  • heat dispersing aluminum chassis
  • high-level inputs with auto-detection & auto turn-on; RCA low-level inputs
  • remote sub control
  • frequency response: 20-20,000 Hz
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • fuse rating: 20A x 2
  • dimensions: 9-1/2"W x 2"H x 8-7/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Be the first to review this product
Great Gear Giveaway

Submit a review and then enter to win a $350 rewards card

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left

Hands-on research

What's in the box?

Download owner's manual

  • 4-channel amplifier
  • Two 20 amp ATO fuses (installed)
  • Wired remote control (subwoofer only)
  • 15' Remote control cable (RJ-25 plug on both ends)
  • Four 5/8" Self-tapping screws
  • Two 1/2" Self-tapping screws
  • Eight Allen-head machine screws
  • 2 Mounting brackets
  • 3mm Allen wrench
  • 2.5mm Allen wrench
  • 1.5m Allen wrench
  • User manual website information

Product Research



Channel Design: The Focal FPD 600.4 can be configured as a 4-channel, 3-channel, or 2-channel amplifier. The amplifier is stable to 2Ω in stereo and 4Ω when bridged.

CEA-2006 Compliant: CEA-2006 is a system of testing and measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4Ω load, with 1% or less Total Harmonic Distortion plus noise (THD+N), and over a frequency range of 20 Hz to 20 kHz (for full range amplifiers). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006 standards allow consumers to compare amplifiers on an equal basis.

Speaker Level Inputs: The RCA inputs will accept either speaker-level or line level signals from your car's head unit. A speaker level signal is connected to the RCA inputs using a speaker wire to RCA adapter (sold separately).

Auto Turn-on: When using a speaker level input, the amp will turn on automatically when it senses the input signal.


Front-mounted Controls: The amplifier controls are mounted on the front panel.

Level Control (Gain): The input level is independently adjustable for channels 1+2 and 3+4. The input range is 0.2 Volts to 8.0 Volts.

Route Switch: The three position Route switch configures the amps inputs:

  • 1+2: all four RCA inputs are used
  • 3+4: only inputs 3+4 are used, and are shorted to channels 1+2
  • Copy: only inputs 3+4 are used; the input signals and filter settings are copied to channels 1+2

Crossover: The amp has independent crossover controls for channels 1+2 and 3+4:

  • CH 1+2:
    • HP/Flat: choose high pass or flat (crossover is bypassed)
    • Frequency: set the crossover point when in high pass mode; rotary dial; 50 Hz-4 kHz
  • CH 3+4:
    • Mode: choose flat (crossover is bypassed), high pass, or low pass/band pass
    • LP/BP: when the mode switch is set to low pass/band pass, choose which one with this switch
    • Frequency:
      • HP: set the crossover point when using as a high pass or band pass crossover; rotary dial; 50 Hz-4 kHz
      • LP: set the crossover point when using as a low pass or band pass crossover; rotary dial; 50 Hz-4 kHz
    • Mono/Stereo: set to mono when powering a subwoofer (or subwoofers); this also activates the wired subwoofer remote

Wired Remote: A wired subwoofer level control is included. The wired remote is only activated when the channel 3+4 crossover is set to low pass and mono. The remote has integrated flanges and screws are included to mount the unit under the dash. It includes a 15' cable to connect to the amplifier.

Note: The wired remote measures approximately 1-5/8" wide (2-5/8" including the mounting flanges) x 3/4" tall x 1-1/2" deep (2-1/8" including the knob and cable).


Front-mounted Terminals: All the connections are on the front of the amplifier for a clean installation.

Power Input: Two set-screw terminals are provided for connecting the power and ground cables. The terminals can accept up to 6-gauge wire (an 8-gauge wiring kit is sufficient for the 40-amp rating of the built-in fuses). The set screws are tightened/loosened with the included 3mm Allen wrench.

Remote Turn-on: The remote turn-on set screw terminal will accept up to 14-gauge wire. The set screw is tightened/loosened with the included 1.5mm Allen wrench.

Speaker Outputs: The four pair of speaker outputs set-screw terminals will accept up to 14-gauge wire. The set screws are tightened/loosened with the included 1.5mm Allen wrench.

Signal Input: The amplifier features two pair of stereo RCA inputs (labeled channel 1+2 and 3+4). If no line level signal is available, you will need two speaker wire to RCA adaptors (sold separately) to connect the amplifier to the source unit via speaker wires.

Remote Control: An RJ-25 jack for connecting the supplied remote bass control.

Fuses: The amp has two internal 20-amp ATO fuses. The bottom panel must be removed to access the fuses.

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 verify what’s in the box, 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.