Garage
Shop

See all parts that fit your 2005 FLSTSC Softail Springer Classic

Cadence QRS 4.125GH

800W RMS QRS Series 2 ohm Stable 4-Channel Class-GH Amplifier

Cadence
Shop all Cadence
highlight-star-icon

• 125 Watts RMS x 4 @ 4 ohm
• 200 Watts RMS x 4 @ 2 ohm
• 400 Watts RMS x 2 @ 4 ohm, Bridged
• High and Low Pass Filters
• 0-15dB
• Aluminum Heatsink
• Dimensions: 17.6" W x 7.56" L x 2.32" H

Learn more about the qrs4125gh

We apologize

This item has been discontinued

NVX - Worth the Envy - Direct to Consumer Car Audio

Loading...
UTE-73BT main

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth

44
-16.69%

$149.95

List price $180.00

CV15BT main

Cerwin-Vega CV15BT

Single Din Digital Media Receiver with Bluetooth

3
MVH-S322BT main

Pioneer MVH-S322BT

Single DIN Digital Media Receiver with Bluetooth and Amazon Alexa

7
-13.34%

$129.99

List price $150.00

KMM-X705 main

Kenwood eXcelon KMM-X705

Single DIN Digital Media Receiver with Bluetooth, Built-in Alexa (Sirius XM Ready)

6
-20.40%

$199.00

List price $250.00

DEH-S7200BHS main

Pioneer DEH-S7200BHS

Single DIN CD Receiver with Bluetooth, HD Radio and SiriusXM Ready

2
-10.72%

$249.99

List price $280.00

KDC-X305 main

Kenwood eXcelon KDC-X305

Single DIN CD Receiver with Bluetooth and Built-in Alexa (Sirius XM Ready)

28
-17.08%

$199.00

List price $240.00

XRM59BT main

Dual XRM59BT

Single DIN Digital Media Receiver with Bluetooth, USB and Aux

28
Limited time!
XAV-AX8500 main

Sony XAV-AX8500

10.1" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Wired Android Auto (SiriusXM Ready)

2
-10.00%

$899.99

List price $999.99

Limited time!
CAR1013 main

Jensen CAR1013

10.1" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto

8
-11.43%

$309.99

List price $349.99

DEH-S4220BT main

Pioneer DEH-S4220BT

Single DIN CD Receiver with Bluetooth and Amazon Alexa

16
-11.77%

$149.99

List price $170.00

Description


Cadence brand icon

Authorized dealer

General Features:

  • Cadence QRS Series QRS 4.125GH
  • Class-GH 2 ohm Stable 4-Channel Amplifier
  • RMS Power Rating:
    • 4 ohm: 125 watts x 4 chan.
    • 2 ohm: 200 watts x 4 chan.
    • 1 ohm: ------------N/A------------
    • Bridged, 4 ohm: 400 watts x 2 chan.
  • Pulse Width Modulated MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Soft start turn-on
  • 4/3/2 or channel operation
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Dual speaker terminals simplify the hookup of multiple speakers
  • Heavy duty aluminum alloy heat-sink
  • Input sensitivity: 200mV - 6V
  • Frequency Response: 20 - 30000 Hz
  • Total Harmonic Distortion (THD): .05%
  • Signal to Noise Ratio: >86 dB
  • Variable high-pass filter: 50 - 250 Hz, 12 dB/octave
  • Variable low-pass filter: 50 - 250 Hz, 24 dB/octave
  • Variable Bass Boost: 0 to +15 dB bass boost
  • Fuse Rating: 35A x 3
  • 4 gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier. Click Here for our contact information.
  • Dimensions: 17.6"W x 7.56"L x 2.32"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Best selling similar products

NDA6004 small

NVX NDA6004

• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

(22)

$159.99

List price $215.99

VADM4v2 small

NVX VADM4 v2 (VADM4v2)

• 80 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 250 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 4-Channel Amplifier

(111)

$209.99

List price $239.99

RD400/4 small

JL Audio RD400/4

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

(44)

$304.99

List price $379.99

MFA 4.220 small

Deaf Bonce MFA 4.220

• 220 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total RMS Power: 1320 watts
• Class D 2 ohm Stable 4-Channel Amplifier

$289.90

List price $289.90

MFA 4.180 small

Deaf Bonce MFA 4.180

• 180 watts x 4 channel @ 4 ohm
• 270 watts x 4 channel @ 2 ohm
• Bridged: 540 watts x 2 channel @ 4 ohm
• Total RMS Power: 1080 watts
• Class D 2 ohm Stable 4-Channel Amplifier

$259.90

List price $259.90

JD400/4 small

JL Audio JD400/4

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

(34)

$299.99

List price $299.99

R2-500X4 small

Rockford Fosgate Prime R2 R2-500X4

• 75 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 250 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 4-Channel Amplifier

(10)

$359.99

List price $359.99

VAD10004v2 small

NVX VAD10004 v2 (VAD10004v2)

• 150 watts x 4 channel @ 4 ohm
• 250 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable 4-Channel Amplifier

(117)

$279.99

List price $335.99

MVPA4 small

NVX MVPA4

• 100 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

(70)

$279.99

List price $383.99

AP200/4BT small

JL Audio AP200/4BT

• 40 watts x 4 channel @ 4 ohm
• 50 watts x 4 channel @ 2 ohm
• Bridged: 100 watts x 4 channel @ 4 ohm
• Total RMS Power: 200 watts
• Class D 2 ohm Stable 4-Channel Amplifier

$549.99

List price $659.99

Specifications & Details


Power Specifications - Full Range Channels
RMS Power @ 4 ohms
125 watts x 4 channel
RMS Power @ 2 ohms
200 watts x 4 channel
Bridged RMS Power
400 watts x 2 channel
Amplifier Specifications
Amplifier Class
GH
Number of Channels
4-Channel
Total RMS Power Output
800 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
2 ohm
Minimum Impedance Bridged
4 ohms
THD at Rated RMS Power
.05%
Speaker Level Inputs
No
Preamp Outputs
1 pair
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
High-Pass Crossover Frequency
50 - 250 Hz
Low-Pass Crossover Frequency
50 - 250 Hz
Signal-to-Noise Ratio
>86 dB
Bass Boost
0 - 15 dB
Remote bass/level controller
No
Fuse Rating
35A x 3 
Total Fuse Rating
105
Strappable
Yes
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

QRS 4.125GH

Weight:

8.00lbs

Internal SKU:

qrs4125gh

Internal Product ID:

149927

Customer Ratings & Reviews


Cadence QRS 4.125GH thumbnail image

5 star
0%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
0
Value
0
Features
0
Design
0
Usability
0

Customer Reviews

Sort by:

Loading...
Sorry, no reviews found


FXA6PROIEM-RED small

Fender FXA6 PRO IEM - Red (fxa6proiem-red)

In-Ear Monitors with Detachable Cable

$329.00

List price $399.99

No picture

Sound Storm Evolution 400 W 4-Channel Full Range Class A/B Amplifier (4 Pack)

Sound Storm Evolution 400 W 4-Channel Full Range Class A/B Amplifier (4 Pack)

(9)

$225.96

List price $479.96

TA2050.2 small

Autotek TA2050.2 TA Series 2-Channel Amplifier

2000W Bridgeable TA Series 2-Ohm Stable 2-Channel Amplifier

(1)

$78.99

List price $219.99

FXA5PROIEM-MB small

Fender FXA5 PRO IEM - Metallic Black (fxa5proiem-mb)

In-Ear Monitors with Dual Balanced Armature Drivers and 6.5mm Precision Tuned Driver

$239.00

List price $299.99

No picture

Hifonics BXX800.4 Brutus 800W RMS A/B 4 Channel Car Audio Amplifier (2 Pack)

Hifonics BXX800.4 Brutus 800W RMS A/B 4 Channel Car Audio Amplifier (2 Pack)

(3)

$527.92

List price $538.00

MDR-ZX700 small

Sony MDRZX700 (MDR-ZX700) Over-Ear Stereo Headphones

Over-Ear Headphones with Noise Isolating Earpads and Oxygen Free Copper Voice Coils

$79.95

List price $119.99

Related Searches


Save up to 10 different vehicles in your garage
Vehicle
Store
Delete

1989 Subaru DL

2017 Nissan NV3500

2013 BMW 760Li

1982 Jeep Cherokee

1987 Mazda B2000

2010 Volvo V70

2008 Volvo XC90

2018 BMW 5 Series

2007 Kia Spectra

2005 Toyota Highlander

Vehicle
Store
Delete

2005 Harley Davidson FLSTSC Softail Springer Classic

2016 Harley Davidson FLS Softail Slim

Add vehicle Clear all vehicles
Where to find vehicle info
Are you sure you want to clear your garage?
This action cannot be undone. Confirm
This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue
Loading...
Identify your vehicle and submodel details
  • Owner's manual
  • Vehicle's insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon

Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.