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EFX 300c4 by Scosche

600W Max, EFX Series 4-Channel High Power Amplifier

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The product on this page is discontinued.
General Features:
  • EFX 4-Channel Class A/B Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 60 watts x 4 chan.
    • 2 ohms: 75 watts x 4 chan.
    • Bridged, 4 ohms: 300 watts x 2 chan.
  • MOSFET switching transistors power supply
  • Low noise circuitry
  • LED power and protect indicators
  • Bass Boost (0-12 dB bass boost at 45 Hz)
  • Multi-mode capability
  • Soft start turn on/off
  • 4/3/2 channel operation
  • Illuminated logo badge
  • Line level and speaker-level inputs with signal sensing for automatic turn-on
  • Preamp RCA outputs loop through
  • 5-Way System Protection circuitry (thermal, overload, speaker short protection, impedance, and reverse polarity)
  • Heavy duty brushed aluminum alloy heatsink and top plate for extreme heat dissipation
  • Sturdy aluminum side panels
  • Silver-plated RCA level inputs
  • Silver-plated screw terminals
  • Variable high-pass filter (40-400 Hz, 12 dB/octave)
  • Variable low-pass filter (40-400 Hz, 12 dB/octave)
  • Subsonic Filter (24 dB at 15 Hz)
  • CEA-2006 compliant amplifier
  • Frequency response: 20-20,000 Hz
  • Dimensions: 12-1/2"L x 10-1/2"W x 2-3/8"H
  • 4-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
Power Specifications - Full Range Channels
RMS Power @ 4 ohms60 watts x 4 channels
RMS Power @ 2 ohms75 watts x 4 channels
RMS Power @ 1 ohmN/A
Bridged RMS Power300 watts x 2 channels
Peak Power OutputN/A
Amplifier Specifications
Amplifier ClassAB
Number of Channels4
Total Peak Power OutputN/A
Total RMS Power Output600 watts
Maximum Input Gauge Size4 AWG
Minimum Impedance Unbridged2 ohms
Minimum Impedance Bridged4 ohms
THD at Rated RMS Power1%
Speaker Level InputsYes
Preamp Outputs1 pair
Built-in CrossoverLow-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency40 - 400 Hz
Low-Pass Crossover Frequency40 - 400 Hz
Subsonic Filter15 Hz
Signal-to-Noise Ratio80 dB
Channel SeparationN/A
Bass Boost0 - 12 dB
Bass/Gain RemoteNo
Fan CooledNo
Fuse Rating25A x 2 
CEA-2006 CompliantYes
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration1 year
Labor Warranty Duration1 year
Warranty ProviderManufacturer
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Amplifier Wiring Kits
Get the wires you need to properly install and power your car amp.
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Complete 4 Gauge Amp Wiring Kit with RCA Interconnect Cables and Speaker Wire!		$89.99
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4 Gauge (AWG) ZN1 Series Single Amplifier Installation Kit for Systems up to 1000 Watts		$37.99
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Dual Amplifier 4 Gauge Amp Installation Kit w/ Distribution Blocks		$99.99
Bass Remote Control
Control the volume level of your bass and amplifier from the front of the vehicle.
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Universal Remote Level Bass ControlUniversal Remote Level Bass Control
Controls bass level and frequency via RCA/Interconnect connectors on any amp.		$14.99
Small Universal Remote Level Bass ControlSmall Universal Remote Level Bass Control
The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.		$12.99
Speaker Wire
Improve the sound quality by delivering more power when replacing your factory wiring. High quality speaker will maximize your amplifier investment and system performance.
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Kicker XW1220 Speaker WireKicker XW1220 Speaker Wire
12 Gauge Wire - 20 ft. of Dual Twist Speaker Cable with Sleeves for a Clean Install		$24.99
StreetWires SCP1215BL - 12 AWG Speaker WireStreetWires SCP1215BL - 12 AWG Speaker Wire
12 Gauge Wire - 15 ft. of Speaker Cable with Twisted Construction		$19.99
RCA Interconnects
You will need a good set of RCA interconnect cables to connect your amplifier to your head unit. Using high quality cables ensure the best sound possible by reducing unwanted noise interference, providing tight contacts, and utilizing the latest in cable technology.
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Kicker 4-Channel RCA Audio Interconnect CableKicker 4-Channel RCA Audio Interconnect Cable
4 Meters (13 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted-Pair, Hyper-Flex Technology		$21.99
Kicker X-Series RCA Interconnect CableKicker X-Series RCA Interconnect Cable
19 ft. of 4-Channel X-Series RCA Cable with dual twisted-pair conductors, hyper-flex technology, and gold-plated k-cut collars for excellent signal transfer.		$36.99
StreetWires ZN9 Series Interconnect CableStreetWires ZN9 Series Interconnect Cable
16.4 ft. of 4-Channel RCA Cable with Rhodium-plated contacts and ZeroNoise construction for clear signal transfer!		$99.99
Installation, Tools & Accessories
With our professional install card, you can have your amp installed by a pro near you, or you can purchase tools and do the install yourself.
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StreetWires FB4StreetWires FB4
4 AWG / 4 Gauge Firewall Bushing		$7.99
Kicker DB1448 (09DB1448) - Top of the Line!Kicker DB1448 (09DB1448) - Top of the Line!
Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs		$18.99
Professional Installation for your Car Power AmplifierProfessional Installation for your Car Power Amplifier
Covers labor charges through our professional installer network.		$89.99
Testing and Performance
Optimize your system's performance with testing tools such as SPL meters, bass test discs and more!
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AutoSound 2000 CD-104AutoSound 2000 CD-104
The ultimate amplifier level setting disc used for evaluation of audio components		$12.99
AutoSound 2000 CD-102AutoSound 2000 CD-102
High Frequency Test CD specifically designed for the set-up and evaluation of sound system imaging and placement.		$12.99
AutoSound 2000 CD-103AutoSound 2000 CD-103
Audiophile reference series test disc for evaluation of all audio components.		$12.99
Related products
EFX 600c4 by Scosche
EFX 4-Channel Class A/B Car Amplifier • 100 Watts x 4 Chan. @ 4 Ohms • 125 Watts x 4 Chan. @ 2 Ohms • 1200 Watts RMS • Multi-Mode Capability • Speaker-Level Inputs • 5-Way System Protection • Low Noise Circuitry
$159.95
in stock
More info

Product Summary

Manufacturer: EFX
Model number: 300c4
UPC: 033991022522
Weight: 10.50 lbs
Internal SKU: 300c4
Internal product ID: 18513

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Sonic Electronix offers quality products at very low prices. But not only that! With the purchase of my item they gave me a bonus gift, an accessory I would have had to buy in order to have everything working. And regarding customer service they were very quick in responding my questions.

- Hector from Marina, CA

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