Why Shop Sonic Free Shipping Free Tech Support Easy Returns Low Price Guarantee Details
Print

SPL FX4-840

840W Max, FX Series 4-Channel Amplifier

4.9

(7 reviews)

Read 7 reviews

Write a review

Specials with this product

  • Free Ground Shipping to the 48 statesdetails
  • SPL FX4-840 840W Max, FX Series 4-Channel Amplifier
  • RMS Power Rating:
    • 4 ohms: 80 watts x 4 chan.
    • 2 ohms: 95 watts x 4 chan.
    • Bridged, @ 4 ohms: 190 watts x 2 chan.
  • Full Mosfet Power Supply
  • PWM Circuitry
  • Full Selectable Crossover Hi/Full/Low
  • Three Way Protection Circuit
  • 2 Ohm Stable Stereo
  • Tri-Mode Capable
  • Variable Low Pass 40 Hz-250 Hz
  • Variable Hi Pass 40 Hz-250 Hz
  • Variable 18 dB Bass Boost @ 40 Hz
  • Frequency Response: 10 Hz to 30 KHz
  • S/N Ratio: 98dB
  • THD: 0.02%
  • System Distress Indicator
  • 4 Guage Power / Ground Connection
  • Platinum Plated RCA Connectors
  • Line Output
  • Dimensions: 12.8" L x 11.1" W x 2.3" H
  • 1-year Manufacturer's warranty
Power Specifications - Full Range Channels
RMS Power @ 4 ohms80 watts x 4 channels
RMS Power @ 2 ohms95 watts x 4 channels
RMS Power @ 1 ohmNot stable
Bridged RMS Power190 watts x 2 channels
Peak Power Output420 watts x 2 channels
Amplifier Specifications
Amplifier ClassAB
Number of Channels4
Total Peak Power Output840 watts
Total RMS Power Output380 watts
Maximum Input Gauge Size8 AWG
Minimum Impedance Unbridged2 ohms
Minimum Impedance Bridged4 ohms
THD at Rated RMS Power.02%
Speaker Level InputsYes
Preamp Outputs1 pair
Built-in CrossoverLow-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency40 - 250 Hz
Low-Pass Crossover Frequency40 - 250 Hz
Subsonic FilterN/A
Signal-to-Noise Ratio98 dB
Channel SeparationN/A
Bass Boost0 - 18 dB
Bass/Gain RemoteNo
Fan CooledNo
Fuse Rating20A x 2 
CEA-2006 CompliantNo
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration1 year
Labor Warranty Duration1 year
Warranty ProviderManufacturer
Customer Review Summary for SPL FX4-840
Average Customer Rating is 4.9 out of 5 stars:
4.9
based on 7 Reviews
Share your thoughts with others:
Write a Review
Rating Distribution:
5 star:
.
.
86%
4 star:
.
.
14%
3 star:
.
0%
2 star:
.
0%
1 star:
.
0%
what's this?
Average Attributes Rating:
Durability
4.9
Value
5.0
Features
4.7
Design
4.6
Usability
4.7
what's this?
Most Helpful Customer Reviews:
September 28, 2011 great
Review by
brandon from jupiter, FL
Overall
Durability
Value
Features
Design
Usability
I have this pushing 6 infinity speakers it gets so loud in the truck it hurts your ears also no distortion. Great product.
Help other customers find the most helpful reviews
Was this review helpful to you?
Yes No
 Report Abuse | Write a Review
Share on Facebook Share on Twitter Share on Delicious Share on Buzz
February 24, 2011 Great amp.
Review by
SpeedyEddy from Ft. Worth, TX
Overall
Durability
Value
Features
Design
Usability
Great amp, gives my 6.5 Pioneer speakers plenty of power and never had a problem with it.
Help other customers find the most helpful reviews
Was this review helpful to you?
Yes No
 Report Abuse | Write a Review
Share on Facebook Share on Twitter Share on Delicious Share on Buzz
September 1, 2010 Great Amp For the Price
Review by
Ryan from Brampton, ON, Canada
Overall
Durability
Value
Features
Design
Usability
This amp provides lots of power, but there are a few cons to the cheap price, the crossover knobs are a bit cheap, mine were bent, and its does heat up a lot affecting sound quality. other than that this amp is great. add a few cpu fans and you solve the heating problem
Help other customers find the most helpful reviews
Was this review helpful to you?
Yes No
 Report Abuse | Write a Review
Share on Facebook Share on Twitter Share on Delicious Share on Buzz
December 16, 2009 perfect and value priced
Review by
groberts5 from Oakland City Indiana
Overall
Durability
Value
Features
Design
Usability
I have this amp running 4 lanzar 3 way speakers in a 08 f-150 this thing makes them scream(in a good way of course). It is running off a kenwood kdc 642u. This amp has all the adjustments you need to get crisp clean sound a great buy in my book
Help other customers find the most helpful reviews
Was this review helpful to you?
Yes No
 Report Abuse | Write a Review
Share on Facebook Share on Twitter Share on Delicious Share on Buzz
October 13, 2009 Great Amp!
Review by
RodC from Providence, RI
Overall
Durability
Value
Features
Design
Usability
This amp is highly recommended. The specs are excellent and you can push this amp for all it's worth. It is a very clean amp. You get a lot of amp for a small price.
Help other customers find the most helpful reviews
Was this review helpful to you?
Yes No
 Report Abuse | Write a Review
Share on Facebook Share on Twitter Share on Delicious Share on Buzz
View All 7 Reviews for SPL FX4-840
Amplifier Wiring Kits
Get the wires you need to properly install and power your car amp.
 ProductPriceAdd?
Monster Cable BAP300Monster Cable BAP300
8 Gauge Amplifier Installation Power Kit (No RCA Interconnects)		$40.00
Kicker DCK8Kicker DCK8
8 Gauge Amplifier Installation Kit with RCA Interconnect Cable		$47.99
Bass Remote Control
Control the volume level of your bass and amplifier from the front of the vehicle.
 ProductPriceAdd?
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.
 ProductPriceAdd?
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.
 ProductPriceAdd?
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 Z-Series RCA Interconnect CableKicker Z-Series RCA Interconnect Cable
19 ft. of 4-Channel RCA cable with dual twisted-pair conductors, hyper-flex technology, and gold plated contacts for maximum signal transfer!		$24.99
StreetWires ZN7 RCA Interconnect CableStreetWires ZN7 RCA Interconnect Cable
16.4 ft. of 4-Channel RCA Cable with hyper twist construction, oxygen free copper, and precision machined tips.		$49.99
Capacitors
Capacitors store energy for the amplifier to use on demand, thereby assisting in the elimination of dimming lights during peak power surges during use.
 ProductPriceAdd?
Raptor C1F ** SPECIAL PRICE **Raptor C1F ** SPECIAL PRICE **
True 1.0 Farad Car Audio Capacitor for up to 1000W Max		$31.99
e2 ECAP1 by Scosche - Mid-Level 1 Farade2 ECAP1 by Scosche - Mid-Level 1 Farad
Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max		$43.99
Rockford Fosgate RFC1D - Top of the Line 1 FaradRockford Fosgate RFC1D - Top of the Line 1 Farad
Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max		$104.99
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.
 ProductPriceAdd?
StreetWires FB8StreetWires FB8
8 Gauge Firewall Bushing		$4.99
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!
 ProductPriceAdd?
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
Main Product
 ProductPriceAdd?
SPL FX4-840SPL FX4-840$89.99

Product Summary

Manufacturer: SPL
Model number: FX4-840
UPC: 709483023260
Weight: 8.40 lbs
Internal SKU: fx4840
Internal product ID: 9172

Price Information

$189.99

–$100.00

$89.99

Add an Optional Extended Warranty

Add

$10.99

$

1 left in stock

save to wish list

Why Sonic Electronix?

February caption contest - win a Powerbag!

Customer Testimonial

I am a returning customer. My past experience with SonicElectronix was a very good one. So after researching pricing on the web I came back. Shipping was less than I expected and it all arrived in 1/2 the time predicted by UPS. If I need upgrades or future projects I know exactly where to go.

- Rick from Stamford, CT

See more…

Recently Viewed Items

fx4840 thumbnail

6" x 8" KS-Series 2-way Speakers 05KS68 (also mounts in most 5" x 7" locations)

fx4840 thumbnail

** 60th Anniversary GTi Series Special Edition ** 6-1/2" 2-way Component Speakers System

fx4840 thumbnail

Sound Concept Series 1" Tweeters ( HT45 )