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Hifonics HFi100.4 + Amplifier Kit

800W RMS, 4-Channel HFi Series Amplifier (HFi 100.4) with 4 Gauge Amplifier Kit

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Retro Look with New Design

The Hifonics HFi100.4 informs you of its main objective in the name, Hi-Fi audio. High end sound processing is the designs main focus, however it continues to bring value to the table by providing high power output in an pleasantly small chassis. The illuminating retro Hifonics logo brings an old-school look back into a new series.

This four channel HFi series amplifier integrates Pulse Width Modulated MOSFET power supplies to allow for affordable power, while causing minimal draw on your cars electrical system. Its bridging options allow bridging from their 4 channel down to 3 channels. This allows the amplifier to drive a bridged channel for a sub, and two unbridged channels for normal output for components such as door speakers. The bridging options also allow for bridging to two separate dedicated channels, to allow for high output to subwoofers, or high powered components.

This incredible power output is combined with the HFi series of amplifiers integrated high-dissipation heat-sink design, and built-in system diagnostics. Affordability does not have to sacrifice value or sound quality – making the HFi100.4 multi-channels the perfect choice.

Hifonics HFi100.4 Amplifier Features:
  • HFi Series 4-Channel Class A/B Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 100 watts x 4 chan.
    • 2 ohms: 200 watts x 4 chan.
    • Bridged, 4 ohms: 400 watts x 2 chan.
  • Max power output: 800 watts
  • Includes 4 Gauge Amplifier Kit and 4 Channel RCA's
  • Pulse Width Modulated (PWM) MOSFET power supply
  • LED power (blue) and protect (red) indicators
  • Variable Bass Boost (0 to +12 dB bass boost at 45 Hz)
  • Blue illuminated Hifonics badge
  • Soft start sound function
  • 4/3/2 channel operation
  • Preamp RCA outputs to daisy chain multiple amps
  • 4-Way System Protection circuitry (thermal, overload, DC, and speaker short protection)
  • Tri-mode speaker operation
  • Heavy duty aluminum alloy vented heatsink for maximum heat dissipation
  • Silver nickle-plated RCA level inputs
  • Silver nickle-plated screw terminals
  • Input sensitivity:
    • Variable level: 200mV-6V
  • Variable high-pass filter (60-12,000 Hz, 12 dB/octave)
  • Variable low-pass filter (30-250 Hz, 12 dB/octave)
  • Damping factor: >180
  • Frequency response: 30-12,000 Hz
  • Dimensions: 16-1/4"L x 8-13/16"W x 2-7/16"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
Amplifier Kit Features
  • 4-gauge power kit: Give your amplifier the best wiring possible for peak performance.
  • Tsunami competition series oxygen free power and ground cable
  • Includes all the hardware you need to safely wire your amplifier with 4-gauge power and ground cables and a 60 amp AGU fuse
  • Wire ties and terminals provide a clean, secure connection between your amplifier and battery
  • Designed for use with amplifiers up to 850 watts
Amplifier Kit includes:
  1. 17ft. 4 Gauge blue power wire
  2. 3ft. 4 Gauge silver ground wire
  3. 16ft. 18 Gauge blue turn-on wire
  4. AGU Fuse holder with 60 AMP fuse
  5. Push-in grommet
  6. (10) 4ft. Black wire ties
  7. (2) 4 Gauge 5/16" Ring terminals
  8. (10) 6" Black wire ties
  9. (2) Red vinyl butt connectors
  10. (2) Red vinyl #10 spade connectors
  11. (4) #8 Pan head phillips screws
RCA Interconnect Features:
  • 4-Channel Twisted Pair of Advanced Audio RCA Interconnect Cables
  • Features the latest in CAT-5 Technology with a double braided outer shield for the ultimate in noise rejection
  • 100% Oxygen free copper and precision wound technology
  • Produces accurate and transparent sound reproduction
  • Utilizes a super-flex PVC jacket and custom metal barrel connector
  • Nickel-plated split tips and rings
  • Color-coded high tech barrels
  • Length: 17 feet
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
Power Specifications - Full Range Channels
RMS Power @ 4 ohms100 watts x 4 channels
RMS Power @ 2 ohms200 watts x 4 channels
RMS Power @ 1 ohmN/A
Bridged RMS Power400 watts x 2 channels
Peak Power OutputN/A
Amplifier Specifications
Amplifier ClassAB
Number of Channels4
Total Peak Power OutputN/A
Total RMS Power Output800 watts
Maximum Input Gauge Size4 AWG
Minimum Impedance Unbridged2 ohms
Minimum Impedance Bridged4 ohms
THD at Rated RMS Power0.05%
Speaker Level InputsNo
Preamp Outputs1 pair
Built-in CrossoverLow-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency60 - 12,000 Hz
Low-Pass Crossover Frequency30 - 250 Hz
Subsonic FilterN/A
Signal-to-Noise Ratio90 dB
Channel Separation80 dB
Bass Boost0 - 12 dB
Bass/Gain RemoteNo
Fan CooledNo
Fuse Rating30A x 2 
CEA-2006 CompliantNo
Amplifier Kit Specifications
Number of Amplifiers Supported1
Power/Ground Wire Size4 gauge
Power Wire Length17 feet
Ground Wire Length3 feet
Speaker Wire IncludedNo
Speaker Wire LengthN/A
Remote Wire Length16 feet
Interconnect (RCA) Signal Cables Included4 Channel
Fuse HolderAGU
Fuse Size60A
Distribution Block IncludedNo
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration1 year
Labor Warranty Duration1 year
Warranty ProviderManufacturer
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Product Summary

Manufacturer: Hifonics
Model number: HFi100.4_AMP850BL
Weight: 18.00 lbs
Internal SKU: hfi1004_amp850bl
Internal product ID: 29853
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Customer Testimonial

Thanks Brian S. for responding to my email so quickly. I wasn't expecting a reply until the next day at the soonest. You replied in an hour. I'm very impressed. I'll definitely being doing business with you guys again.

- Mex from Los Angeles

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