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1978 GMC G25

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Single, 1-channel monoblock sub amplifiers for when you add a sub

Overview Upgrade your Stereo Upgrade your Speakers Add an Amplifier Digital Sound Processors Audio Installation & Accessories Dads & Grads Sale

Amplifiers for Powering a Sub for 1978 GMC G25

Some vehicles require an amp bypass module, a line-output converter like the NVX XLCA2 or AudioControl LC2i, or a DSP to integrate with your factory radio and avoid bass roll-off. Bass roll-off occurs when a factory radio's crossover is designed only for the original equipment speakers, resulting in a not complete signal being sent to your new aftermarket amp.

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Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.
Total Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Remote bass/level controller
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
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Alpine R2-A150M with NVX 4 Gauge Amp Kit

1500W RMS R-Series Class D Monoblock Amplifier

R2-A150M, XKIT42 big
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Alpine R2-A150M with NVX 4 Gauge Amp Kit

1500W RMS R-Series Class D Monoblock Amplifier

• 700 watts x 1 channel @ 4 ohm
• 1200 watts x 1 channel @ 2 ohm
• 1500 watts x 1 channel @ 1 ohm
• Total RMS Power: 1500 watts
• CEA-2006 Compliant
• Class D 1 ohm Stable Monoblock Amplifier

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• 700 watts x 1 channel @ 4 ohm
• 1200 watts x 1 channel @ 2 ohm
• 1500 watts x 1 channel @ 1 ohm
• Total RMS Power: 1500 watts
• CEA-2006 Compliant
• Class D 1 ohm Stable Monoblock Amplifier

Deaf Bonce MLA-1500 with Belva 4 Gauge Amp Kit

1480W RMS Machete Series Class-D Monoblock Amplifier

MLA-1500, BAK42 big
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Deaf Bonce MLA-1500 with Belva 4 Gauge Amp Kit

1480W RMS Machete Series Class-D Monoblock Amplifier

• 540 watts x 1 channel @ 4 ohm
• 920 watts x 1 channel @ 2 ohm
• 1480 watts x 1 channel @ 1 ohm
• Total RMS Power: 1480 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Belva BAK42 4 Gauge Amp Wiring Kit

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• 540 watts x 1 channel @ 4 ohm
• 920 watts x 1 channel @ 2 ohm
• 1480 watts x 1 channel @ 1 ohm
• Total RMS Power: 1480 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Belva BAK42 4 Gauge Amp Wiring Kit

Kicker 46CXA800.1 with Amp Kit and 3 Year Warranty

800W Peak (600W RMS) CX Series Class-D Monoblock Amplifier with 4 Gauge Amp Kit

CXA800.1, 46CK4 big
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Kicker 46CXA800.1 with Amp Kit and 3 Year Warranty

800W Peak (600W RMS) CX Series Class-D Monoblock Amplifier with 4 Gauge Amp Kit

• 300 Watts RMS x 1 @ 4 ohm
• 600 Watts RMS x 1 @ 2 ohm
• 800 Watts RMS x 1 @ 1 ohm
• Efficient Class-D Monoblock Amplifier
• KickEQ™ 6dB variable bass boost for those additional low frequencies
• FIT+™ (Fail-safe Integration Technology-PLUS) means it works with nearly every radio
• Amplifier wiring kit included

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• 300 Watts RMS x 1 @ 4 ohm
• 600 Watts RMS x 1 @ 2 ohm
• 800 Watts RMS x 1 @ 1 ohm
• Efficient Class-D Monoblock Amplifier
• KickEQ™ 6dB variable bass boost for those additional low frequencies
• FIT+™ (Fail-safe Integration Technology-PLUS) means it works with nearly every radio
• Amplifier wiring kit included

Rockford Fosgate Power T750X1bd + NVX XKIT42

750W Power Series Ultra Compact Class-BD Monoblock Amplifier + NVX 4 Gauge Amp Wiring Kit

T750X1bd, XKIT42 big
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Rockford Fosgate Power T750X1bd + NVX XKIT42

750W Power Series Ultra Compact Class-BD Monoblock Amplifier + NVX 4 Gauge Amp Wiring Kit

• 500 Watts RMS x 1 @ 4 ohm
• 750 Watts RMS x 1 @ 2 ohm
• 750 Watts RMS x 1 @ 1 ohm
• Total Peak Power: 1500 Watts
• CEA-2006 Compliant
• C.L.E.A.N. input/output clip detection and indicator LEDs
• Dual extruded heat sinks
• C.L.E.A.N. input/output clip detection and indicator LEDs
• Real time thermal sensing with Rollback technology
• Dimensions: 4.3"W x 8.3"L x 1.6"H

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• 500 Watts RMS x 1 @ 4 ohm
• 750 Watts RMS x 1 @ 2 ohm
• 750 Watts RMS x 1 @ 1 ohm
• Total Peak Power: 1500 Watts
• CEA-2006 Compliant
• C.L.E.A.N. input/output clip detection and indicator LEDs
• Dual extruded heat sinks
• C.L.E.A.N. input/output clip detection and indicator LEDs
• Real time thermal sensing with Rollback technology
• Dimensions: 4.3"W x 8.3"L x 1.6"H

Alpine R2-A75M with NVX 4 Gauge Amp Kit

750W RMS R-Series Class-D Monoblock Car Amplifier

R2-A75M, XKIT42 big
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Alpine R2-A75M with NVX 4 Gauge Amp Kit

750W RMS R-Series Class-D Monoblock Car Amplifier

• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Rockford Fosgate R2-750X1 with Amplifier Wiring Kit

Rockford Fosgate Prime 750 Watt MonoBlock Amplifier + NVX Premium Complete Amp Kit

R2-750X1, XKIT42 big
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Rockford Fosgate R2-750X1 with Amplifier Wiring Kit

Rockford Fosgate Prime 750 Watt MonoBlock Amplifier + NVX Premium Complete Amp Kit

• 250 Watts RMS x 1 @ 4 ohm
• 500 Watts RMS x 1 @ 2 ohm
• 750 Watts RMS x 1 @ 1 ohm
• Total Peak Power: 500 Watts
• CEA-2006 Compliant • Rollback Protection

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• 250 Watts RMS x 1 @ 4 ohm
• 500 Watts RMS x 1 @ 2 ohm
• 750 Watts RMS x 1 @ 1 ohm
• Total Peak Power: 500 Watts
• CEA-2006 Compliant • Rollback Protection

Cerwin-Vega VCU81 with NVX 4 Gauge Amp Kit

Vega Series 600W Class D Monoblock Car Audio Amplifier

VCU81, XKIT42 big
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Cerwin-Vega VCU81 with NVX 4 Gauge Amp Kit

Vega Series 600W Class D Monoblock Car Audio Amplifier

• Vega Series Class D Mono 600W Amplifier
• RMS Power: 400W x 1 @ 2 Ohm
• RMS Power: 240W x 1 @ 4 Ohm
• MAX Power: 600W x 1 @ 1 Ohm
• Surface Mount Component Technology
• Compact Universal All-Weather Application
• Variable/Switchable Crossovers On Multi-Channel Models

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• Vega Series Class D Mono 600W Amplifier
• RMS Power: 400W x 1 @ 2 Ohm
• RMS Power: 240W x 1 @ 4 Ohm
• MAX Power: 600W x 1 @ 1 Ohm
• Surface Mount Component Technology
• Compact Universal All-Weather Application
• Variable/Switchable Crossovers On Multi-Channel Models

MB Quart FA2-1000.1 with Amplifier Wiring Kit

1000W RMS Formula Series Class-D Monoblock Car Amplifier

FA2-1000.1, BAK42 big
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MB Quart FA2-1000.1 with Amplifier Wiring Kit

1000W RMS Formula Series Class-D Monoblock Car Amplifier

• 250 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm
• Class D Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 250 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm
• Class D Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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Deaf Bonce Apocalypse 1600.1 Pro with Belva 4 Gauge Amp Kit

1600W RMS Class D Apocalypse Atom Pro Series Monoblock Subwoofer Amplifier with Bass Remote

ATOM16001PRO_BAK42 big
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Deaf Bonce Apocalypse 1600.1 Pro with Belva 4 Gauge Amp Kit

1600W RMS Class D Apocalypse Atom Pro Series Monoblock Subwoofer Amplifier with Bass Remote

• 550 watts x 1 channel @ 4 ohm
• 1010 watts x 1 channel @ 2 ohm
• 1600 watts x 1 channel @ 1 ohm
• Total RMS Power: 1600 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 550 watts x 1 channel @ 4 ohm
• 1010 watts x 1 channel @ 2 ohm
• 1600 watts x 1 channel @ 1 ohm
• Total RMS Power: 1600 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Rockford PM100X1K + NVX XKIT82 8 Gauge Amp Wiring Kit

Two Compact Full-Range Monoblock Amplifiers 60 watts RMS x 1 (each)

PM100X1K, XKIT82 big
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Rockford PM100X1K + NVX XKIT82 8 Gauge Amp Wiring Kit

Two Compact Full-Range Monoblock Amplifiers 60 watts RMS x 1 (each)

• PM100X1K
• Punch Marine 100 Watt Full-Range Mono Amplifier (pair)
• Number of Channels: 1
• Frequency Response: 60Hz - 20kHz +/- 1.0dB
• Includes NVX XKIT82 8 Gauge Amp Wiring Kit

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$389.98

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• PM100X1K
• Punch Marine 100 Watt Full-Range Mono Amplifier (pair)
• Number of Channels: 1
• Frequency Response: 60Hz - 20kHz +/- 1.0dB
• Includes NVX XKIT82 8 Gauge Amp Wiring Kit

JBL ClubA1000 (Club A 1000) + 30% off High Quality NVX Amp Kit

High Performance Mono-block Subwoofer Amplifier

AMPCBA1000AM, XKIT42 big
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JBL ClubA1000 (Club A 1000) + 30% off High Quality NVX Amp Kit

High Performance Mono-block Subwoofer Amplifier

• Class D Amp Technology
• 4 Ohm: 600 Watts RMS x 1
• 2 Ohm: 1000 Watts RMS x 1
• Variable Crossover and Bass Boost
• Turn-On Mode Switch

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• Class D Amp Technology
• 4 Ohm: 600 Watts RMS x 1
• 2 Ohm: 1000 Watts RMS x 1
• Variable Crossover and Bass Boost
• Turn-On Mode Switch

Kenwood eXcelon XR1001-1 + High Quality NVX Amp Kit

2000W Max (1000W RMS) XR Series 2-ohm Stable Class-D Monoblock Amplifier w/ Bass Knob Included

XR1001-1, XKIT42 big
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Kenwood eXcelon XR1001-1 + High Quality NVX Amp Kit

2000W Max (1000W RMS) XR Series 2-ohm Stable Class-D Monoblock Amplifier w/ Bass Knob Included

• 500 Watts RMS x 1 @ 4 ohm
• 1000 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 2000 Watts
• CEA-2006 Compliant
• Bass Knob Included
• Aluminum Heatsink
• Dimensions: 12-5/8" W x 6-5/8" L x 2" H

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• 500 Watts RMS x 1 @ 4 ohm
• 1000 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 2000 Watts
• CEA-2006 Compliant
• Bass Knob Included
• Aluminum Heatsink
• Dimensions: 12-5/8" W x 6-5/8" L x 2" H

Alpine S2-A60M with Belva 4 Gauge Amp Kit

600W RMS S-Series Class-D Monoblock Car Amplifier

S2-A60M, BAK42 big
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Alpine S2-A60M with Belva 4 Gauge Amp Kit

600W RMS S-Series Class-D Monoblock Car Amplifier

• 330 watts x 1 channel @ 4 ohm
• 600 watts x 1 channel @ 2 ohm
• Class D 2 ohm Stable Monoblock Amplifier

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• 330 watts x 1 channel @ 4 ohm
• 600 watts x 1 channel @ 2 ohm
• Class D 2 ohm Stable Monoblock Amplifier

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Rockford Fosgate Punch P300X1 with Amplifier Wiring Kit

300W RMS Punch Series Monoblock Class AB Car Power Amplifier

P300X1, XKIT42 big
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Rockford Fosgate Punch P300X1 with Amplifier Wiring Kit

300W RMS Punch Series Monoblock Class AB Car Power Amplifier

• RMS: 200W x 1 @ 4 ohm, 300W x 1 @ 2 ohm
• Total RMS Power: 300W
• Built-in NOMAD Circuit Protects Amplifier
• Tuned Bass EQ: 0 to +18 dB
• Cast Aluminum Heatsink with Dynamic Thermal Management
• Dimensions: 9-7/8"L x 7-3/4"W x 2-3/8"H

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• RMS: 200W x 1 @ 4 ohm, 300W x 1 @ 2 ohm
• Total RMS Power: 300W
• Built-in NOMAD Circuit Protects Amplifier
• Tuned Bass EQ: 0 to +18 dB
• Cast Aluminum Heatsink with Dynamic Thermal Management
• Dimensions: 9-7/8"L x 7-3/4"W x 2-3/8"H

Rockford Fosgate M5-1000X1with NVX 8 Gauge Amp Kit

750W RMS M5-Series Class-BD Monoblock Marine Amplifier

M51000X1_XKIT82 big
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Rockford Fosgate M5-1000X1with NVX 8 Gauge Amp Kit

750W RMS M5-Series Class-BD Monoblock Marine Amplifier

• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm (Dynamic Power)
• Total RMS Power: 750 watts
• Class BD 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm (Dynamic Power)
• Total RMS Power: 750 watts
• Class BD 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Rockford Fosgate M2-500X1 with Amplifier Wiring Kit

500 Watt Monoblock marine amplifier

M2-500X1, XKIT42 big
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Rockford Fosgate M2-500X1 with Amplifier Wiring Kit

500 Watt Monoblock marine amplifier

• 300 Watts x 1 @ 4 ohm
• 500 Watts x 1 @ 2 ohm
• Element Ready™ design protects against outdoor exposure
• Conformal coated circuit board
• Top Mounted Control Panel

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• 300 Watts x 1 @ 4 ohm
• 500 Watts x 1 @ 2 ohm
• Element Ready™ design protects against outdoor exposure
• Conformal coated circuit board
• Top Mounted Control Panel

Rockford Fosgate R2-250X1 + Free Belva BAK42 4 Gauge Amp Wiring Kit

Prime Series 250 Watt MonoBlock Amplifier + Belva 4 Gauge Amp Kit

R2-250X1, BAK42 big
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Rockford Fosgate R2-250X1 + Free Belva BAK42 4 Gauge Amp Wiring Kit

Prime Series 250 Watt MonoBlock Amplifier + Belva 4 Gauge Amp Kit

• 150 Watts RMS x 1 @ 4 ohm
• 250 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 250 Watts
• CEA-2006 Compliant/Preamp Outputs/LPF
• Sub Infrasonic Filter: 15 Hz - 40 Hz

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• 150 Watts RMS x 1 @ 4 ohm
• 250 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 250 Watts
• CEA-2006 Compliant/Preamp Outputs/LPF
• Sub Infrasonic Filter: 15 Hz - 40 Hz

Deaf Bonce MLA-800 with Amplifier Wiring Kit

790W RMS Machete Series Class-D Monoblock Amplifier

MLA-800, BAK42 big
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Deaf Bonce MLA-800 with Amplifier Wiring Kit

790W RMS Machete Series Class-D Monoblock Amplifier

• 340 watts x 1 channel @ 4 ohm
• 540 watts x 1 channel @ 2 ohm
• 790 watts x 1 channel @ 1 ohm
• Total RMS Power: 790 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 340 watts x 1 channel @ 4 ohm
• 540 watts x 1 channel @ 2 ohm
• 790 watts x 1 channel @ 1 ohm
• Total RMS Power: 790 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Alpine KTA-200M with NVX 8 Gauge Amp Kit

200W RMS Class D Monoblock Subwoofer Amplifier

KTA-200M, XKIT82 big
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Alpine KTA-200M with NVX 8 Gauge Amp Kit

200W RMS Class D Monoblock Subwoofer Amplifier

• Power stack Capable
• CTA-2006 Compliant
• Fits in the open space behind Alpine’s iLX-W650
• 100W x 1 RMS
• 200W x 1 RMS
• 400W x 1 DPP
• Includes Amplifier Wiring Kit

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• Power stack Capable
• CTA-2006 Compliant
• Fits in the open space behind Alpine’s iLX-W650
• 100W x 1 RMS
• 200W x 1 RMS
• 400W x 1 DPP
• Includes Amplifier Wiring Kit

Rockford Fosgate Punch P500X1BD + Rockford Fosgate RFK4I 4 Gauge 2-Ch Amp Kit

500W RMS Punch Series Monoblock Class BD Car Power Amplifier

P500X1BD, RFK4I big
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Rockford Fosgate Punch P500X1BD + Rockford Fosgate RFK4I 4 Gauge 2-Ch Amp Kit

500W RMS Punch Series Monoblock Class BD Car Power Amplifier

• RMS: 150W x 1 @ 4 ohm, 300W x 1 @ 2 ohm, 500W x 1 @ 1 ohm
• Total RMS Power: 500W
• CEA-2006 Compliant
• Tuned Bass EQ: 0 to +18 dB
• Super Efficient Class BD Circuitry
• Dimensions: 11"L x 7-3/4"W x 2-3/8"H
• Includes Rockford Fosgate RFK4I 4 Gauge 2-Ch Amp Kit

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• RMS: 150W x 1 @ 4 ohm, 300W x 1 @ 2 ohm, 500W x 1 @ 1 ohm
• Total RMS Power: 500W
• CEA-2006 Compliant
• Tuned Bass EQ: 0 to +18 dB
• Super Efficient Class BD Circuitry
• Dimensions: 11"L x 7-3/4"W x 2-3/8"H
• Includes Rockford Fosgate RFK4I 4 Gauge 2-Ch Amp Kit

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    FAQ for Monoblock Sub Amplifiers in 1978 G25

    Q: Can I upgrade or change the Monoblock Sub Amplifiers in 1978 GMC G25?

    A: Yes this page includes all the best Monoblock Sub Amplifiers that work in your G25.

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