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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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Crunch GP-1500.4 with Belva BAK44 Amp Kit

1500W RMS Class AB Ground Pounder Series 4 Channel Car Amplifier + 4 Gauge Premium (CCA) Complete 4-Channel Amplifier Wiring Kit with RCA up to 1200 Watts

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Crunch GP-1500.4 with Belva BAK44 Amp Kit

1500W RMS Class AB Ground Pounder Series 4 Channel Car Amplifier + 4 Gauge Premium (CCA) Complete 4-Channel Amplifier Wiring Kit with RCA up to 1200 Watts

• 185 watts x 4 channel @ 4 ohm
• 375 watts x 4 channel @ 2 ohm
• Bridged: 750 watts x 2 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier

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66
List price $219.98
-50% $109.99

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• 185 watts x 4 channel @ 4 ohm
• 375 watts x 4 channel @ 2 ohm
• Bridged: 750 watts x 2 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier

Crunch GP-1500.1 Amplifier + Free Amp Wiring Kit

1500 Watts Ground Pounder Mono Subwoofer Car Amplifier

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Crunch GP-1500.1 Amplifier + Free Amp Wiring Kit

1500 Watts Ground Pounder Mono Subwoofer Car Amplifier

• Variable Electronic Crossover
• Bass Remote Included
• Subsonic Filter
• Switchable Bass Boost

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64
List price $219.98
-39% $134.99

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• Variable Electronic Crossover
• Bass Remote Included
• Subsonic Filter
• Switchable Bass Boost

Crunch PZ2-2030.2D with Amplifier Wiring Kit

1000W RMS Powerzone 2 Series Class-D 2-Channel Car Amplifier Package

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Crunch PZ2-2030.2D with Amplifier Wiring Kit

1000W RMS Powerzone 2 Series Class-D 2-Channel Car Amplifier Package

• 4 ohm: 2 x 500
• 2 ohm: 2 x 1000
• 4 ohm: 1 x 2000
• Total RMS Power: 2000 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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169
List price $219.98
-45% $119.99

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• 4 ohm: 2 x 500
• 2 ohm: 2 x 1000
• 4 ohm: 1 x 2000
• Total RMS Power: 2000 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch 2000 Watts Ground Pounder Four Channel Car Audio Amplifier

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Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch 2000 Watts Ground Pounder Four Channel Car Audio Amplifier

• Variable Electronic Crossover
• Class A/B Amplifier
• Switchable Bass Boost
• Includes Belva BAK44 4 Gauge Amp Wiring Kit

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64
List price $239.98
-50% $119.65

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• Variable Electronic Crossover
• Class A/B Amplifier
• Switchable Bass Boost
• Includes Belva BAK44 4 Gauge Amp Wiring Kit

Crunch DR-1325.1 with Belva 8 Gauge Amp Kit

1325W Peak Class AB V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

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Crunch DR-1325.1 with Belva 8 Gauge Amp Kit

1325W Peak Class AB V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

• 650 watts x 1 channel @ 4 ohm
• 1325 watts x 1 channel @ 2 ohm
• Total peak power output: 1325 watts
• Class A/B 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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97
List price $159.98
-21% $126.73

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• 650 watts x 1 channel @ 4 ohm
• 1325 watts x 1 channel @ 2 ohm
• Total peak power output: 1325 watts
• Class A/B 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-3725.1D with Belva 4 Gauge Amp Kit

3725W Peak Class D V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

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Crunch DR-3725.1D with Belva 4 Gauge Amp Kit

3725W Peak Class D V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

• 930 watts x 1 channel @ 4 ohm
• 1860 watts x 1 channel @ 2 ohm
• 3725 watts x 1 channel @ 1 ohm
• Total peak power output: 3725 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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170
List price $219.98
-29% $155.99

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• 930 watts x 1 channel @ 4 ohm
• 1860 watts x 1 channel @ 2 ohm
• 3725 watts x 1 channel @ 1 ohm
• Total peak power output: 3725 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-2725.1D with Belva 4 Gauge Amp Kit

2725W Peak Class D V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

DR27251D_BAK42 big
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Crunch DR-2725.1D with Belva 4 Gauge Amp Kit

2725W Peak Class D V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

• 1360 watts x 1 channel @ 4 ohm
2725 watts x 1 channel @ 2 ohm
• Total peak power output: 2725 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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169
List price $199.98
-34% $130.99

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Only 3 Left!

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• 1360 watts x 1 channel @ 4 ohm
2725 watts x 1 channel @ 2 ohm
• Total peak power output: 2725 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-1325.4D with Belva 4 Gauge Amp Kit

1325W Peak Class D V-Drive Series 4-Channel Full Range Car Amplifier

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Crunch DR-1325.4D with Belva 4 Gauge Amp Kit

1325W Peak Class D V-Drive Series 4-Channel Full Range Car Amplifier

• 165 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total peak power output: 1325 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Save 15% Off Package Deals at Checkout!
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List price $216.98
-25% $163.49

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• 165 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total peak power output: 1325 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-2525.4D with Belva 4 Gauge Amp Kit

2525W Peak Class D V-Drive Series 4-Channel Full Range Car Amplifier

DR25254D_BAK44 big
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Crunch DR-2525.4D with Belva 4 Gauge Amp Kit

2525W Peak Class D V-Drive Series 4-Channel Full Range Car Amplifier

• 320 watts x 4 channel @ 4 ohm
• 630 watts x 4 channel @ 2 ohm
• Bridged: 1260 watts x 2 channel @ 4 ohm
• Total peak power output: 2525 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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62
List price $219.98
-41% $128.99

In stock

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• 320 watts x 4 channel @ 4 ohm
• 630 watts x 4 channel @ 2 ohm
• Bridged: 1260 watts x 2 channel @ 4 ohm
• Total peak power output: 2525 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-2125.2D with Belva 4 Gauge Amp Kit

2125W Peak Class D V-Drive Series 2-Channel Full Range Car Amplifier

DR21252D_BAK42 big
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Crunch DR-2125.2D with Belva 4 Gauge Amp Kit

2125W Peak Class D V-Drive Series 2-Channel Full Range Car Amplifier

• 530 watts x 2 channel @ 4 ohm
• 1060 watts x 2 channel @ 2 ohm
• Bridged: 2125 watts x 1 channel @ 4 ohm
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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169
List price $155.98
-25% $116.23

In stock

Only 2 Left!

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• 530 watts x 2 channel @ 4 ohm
• 1060 watts x 2 channel @ 2 ohm
• Bridged: 2125 watts x 1 channel @ 4 ohm
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-3125.2D with Belva 4 Gauge Amp Kit

3125W Peak Class D V-Drive Series 2-Channel Full Range Car Amplifier

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Crunch DR-3125.2D with Belva 4 Gauge Amp Kit

3125W Peak Class D V-Drive Series 2-Channel Full Range Car Amplifier

• 780 watts x 2 channel @ 4 ohm
• 1560 watts x 2 channel @ 2 ohm
• Bridged: 3125 watts x 1 channel @ 4 ohm
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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169
List price $169.98
-22% $132.48

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• 780 watts x 2 channel @ 4 ohm
• 1560 watts x 2 channel @ 2 ohm
• Bridged: 3125 watts x 1 channel @ 4 ohm
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Crunch SA-1100.2 with Belva 4 Gauge Amp Kit

1100 Watt Smash Series Class A/B 2 Channel Amplifier

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Crunch SA-1100.2 with Belva 4 Gauge Amp Kit

1100 Watt Smash Series Class A/B 2 Channel Amplifier

• RMS Power: 30W x 2 @ 4 ohm, 35W x 2 @ 2 ohm
• Total Peak Power: 1100W
• CEA-2006 Compliant/Preamp Outputs/LPF
• Frequency Response: 10Hz-22kHz
• Includes Amplifier Wiring Kit

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169
List price $149.98
-36% $96.23

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• RMS Power: 30W x 2 @ 4 ohm, 35W x 2 @ 2 ohm
• Total Peak Power: 1100W
• CEA-2006 Compliant/Preamp Outputs/LPF
• Frequency Response: 10Hz-22kHz
• Includes Amplifier Wiring Kit

 
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    ALL Crunch STORE CATEGORIES

    Since 1979, Crunch has been manufacturing high performance and high quality amplifiers; their goal has always been to produce the "best in class" amplifiers. Over the years, Crunch has gone on to produce car speakers and subwoofers to go along with their famous amplifiers, making them one of the more popular car audio manufactures in the business. All Crunch products are equipped with the latest designs and technology with their motto being "best bump for the buck". Crunch's affordable and innovative engineering ensures that they will be one of the leaders in Car Audio for years to come.

    Crunch is a proud trademark of Maxxsonics USA. They take extreme care and satisfaction in producing only the finest quality products that exceed their expectations. Be confident in browsing products that have the Maxxsonics name, they stand for quality and performance.

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