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FLI Audio :: FU720.4-F1 :: $99.99

FLI Audio FU720.4-F1

Item# 28456

720W Class A/B 4-Channel Underground Series Car System  Amplifier

Sorry, this product is no longer available.

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Power Output

  • 70W x 4 @ 4-Ohms
  • 90W x 4 @ 2-Ohms
  • 180W x 2 [Bridged] @ 4-Ohms

General Features

  • Pulse Width Modulated MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Selectable bass boost (0, 6, 12 dB)
  • Soft Start Turn-on
  • 4/3/2 Channel operation
  • Speaker-level (high-level) inputs with signal sensing for automatic turn-on
  • 3-Way System Protection circuitry (thermal, overload, and speaker short protection)
  • Built-in cooling fan keeps the amplifier running more efficiently
  • Heavy duty aluminum alloy heatsink for effective heat dissipation
  • Nickel-plated RCA level inputs
  • Nickel-plated screw terminals
  • Variable high-pass filter (50-300 Hz)
  • Variable low-pass filter (50-300 Hz)
  • Frequency response: 20-20,000 Hz
  • Dimensions: 7-5/8"L x 14"W x 2"H


  • UPC: 086429226177
  • Weight: 7
  • Authorized Internet Dealer
*Warranty: 1 Year Manufacturer warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to for replacement within 30 days from the original date of purchase with proper return authorization. After the 30 day time period, products must be returned to their original manufacturer for the remainder of the manufacturer's warranty period.

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   Allan From Fort Washington, MD

This is a nice amplifier. I'm pushing 4 Boss Audio 6X9" speakers on the 1&2 channel at 2ohm. 2 Bazooka 12" bass tubes on the 3&4 channel at 4ohm. The amp sounds clear. Bass/Mid/Highs sounds good. Amplifier has a cooling fan, and amp runs cool. Amp and speakers are in a 2010 Dodge Journey.