Focal FD 4.350 Ultra-Compact 4-Channel Amplifier

Model: FD4350 UPC: 3544055676058 Item: 162745

Product Information

Small Size, Big Power

When we first saw the Focal FD 4.350 4-channel car amplifier, we were a little skeptical of how good it could be when it was so tiny (7-7/8”W x 1-11/16”H x 4-5/16”D). We grew up with large amplifiers that ran hot enough to cook a steak on after about ten minutes of use. The ultra-compact FD 4.350 took us by surprise, needless to say. Delivering 58 watts through each of its 4 channels, this little guy can rock your new speakers, but tuck away snugly under a front seat.

Integrates to Your Sound System

Included with the Focal FD 4.350 speaker amplifier is a pair of speaker level input transformers that allows you to tap into a factory-installed audio system. What’s great about these transformers is that they generate a turn-on signal that will turn the FD 4.350 on when they sense audio coming towards the amplifier. You don’t have to worry about finding an alternative source to turn the amplifier on. The speaker amplifier also has your traditional RCA inputs if you’re using an aftermarket radio or have an audio processor in-place.

Direct FET® Technology

Even though the amplifier is small and runs on the cooler side of the temperature spectrum, the longer (and louder) you run your audio system, the more heat this amplifier generates. In order to remain as efficient as possible, the amplifier employs something called Direct FET® technology. This allows the amplifier to run coolly by dissipating the heat not only through the aluminum heatsinks, but also through the chassis of the amplifier itself. The heat management that the FD 4.350 amplifier has is pretty gnarly, but then again, what else would you expect from Focal?

One Versatile Amplifier

The FD 4.350 amplifier allows you to do something special: you can opt to use it in either 4-channel, 3-channel, or 2-channel mode. So now maybe you’re wondering why you have so many choices? For one major reason: it allows you to adapt as you change your speaker configuration or perhaps add a small subwoofer. You may not have to worry about buying another amplifier in the future. It depends on what you expect the final result to sound like. See the power output differences under the “Specifications” tab.

FD 4.350 Highlights:

  • Use in either 4-channel, 3-channel, or 2-channel mode
  • Class D technology for incredible efficiency
  • Direct FET® technology to effectively manage heat
  • Selectable high- and low-pass filters on front and rear channels
  • Includes OEM integration adapters (2 speaker level input transformers)
  • Aftermarket radio integration via pre-amp inputs
  • Dimensions: 7-7/8”W x 1-11/16”H x 4-5/16”D
  • Warranty: 1 year
  • Included: World Wide Stereo 60-day guarantee and expert product support



  • 4-channel car amplifier
  • 58 watts x 4 at 4 ohms
  • 100 watts x 4 at 2 ohms
  • 200 watts x 2 bridged at 4 ohms
  • Selectable high- and low-pass filters on front and rear channels (adjustable 40-400Hz)
  • Ultra-compact aluminum chassis
  • Class D technology
  • Direct FET® technology built-in
  • 10-gauge power/ground inputs (wiring kit sold separately)
  • Dimensions: 7-7/8”W x 1-11/16”H x 4-5/16”D

What's in the Box

What's in the Box:

  • 1 FD 4.350 amplifier
  • 1 extra 30A fuse
  • 1 pair of terminal endcaps (installed on amplifier)
  • 1 pair of speaker level input transformers
  • 8” power wire with in-line fuse holder
  • 1 pair of 8” speaker input harnesses
  • 8” speaker level input transformer harness
  • 4 mounting screws
  • 2.5mm Allen wrench
  • 9 crimp-on spade speaker wire/remote turn-on connectors (14/16 gauge)
  • 2 crimp-on spade power/ground connectors (10/12 gauge)
  • 6 red spade insulating jackets
  • 5 black spade insulating jackets
  • Owner’s manual


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