What does high-bias Class AB mean for sound?

The output devices run with more standing current than a standard Class AB amp. Crescendo says this gives a natural, dynamic and transparent character, and it is the main reason sound-quality buyers pick it over a Class D amp.

Can I bridge it to power a subwoofer?

Yes. A four-channel amp can bridge into two channels, so you can run two channels on the front speakers and bridge the other two for a sub. That covers a simple front-stage-plus-sub system with one amp.

Class AB designs generate more heat than Class D, and the high bias adds to that. Mount it where air can move around the heatsink and keep the gain settings sane.

How does it compare with a Class D four-channel?

Class D amps are smaller, cooler and more efficient. The REVOLUTION 3A4 gives up some of that for the Class AB tone that sound-quality listeners tend to prefer.

What do I need to install it?

Plan on a fused power wire sized for the amp's current draw, a solid ground, RCA cables and speaker wiring. Class AB current draw is higher than Class D, so don't undersize the power cable.

Crescendo REVOLUTION 3A4 4-Channel Amplifier

Best price now

$379.99at Audio IntensityChecked Nov 11

Prices are checked against each store and labelled with when.

Visit Audio Intensity

Crescendo REVOLUTION 3A4 4-Channel Amplifier

Best price now

$379.99at Audio IntensityChecked Nov 11

Prices are checked against each store and labelled with when.

Visit Audio Intensity

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Price facts

Last seen at $379.99 at Audio Intensity on Nov 11.

Our take on the Crescendo REVOLUTION 3A4 4-Channel Amplifier

The Crescendo REVOLUTION 3A4 is a four-channel car amplifier built on a high-bias Class AB design. Crescendo rates it for natural, dynamic and transparent sound, aimed at high-fidelity daily-driver systems and compact sound-quality installs. Four channels let it run front and rear speakers, or bridge two channels to a subwoofer while keeping two for the front stage. Against compact Class D rivals it trades smaller size and cooler running for the warmer Class AB character and higher bias that sound-quality buyers tend to prefer.

Best forSound-quality builds where tone matters more than raw outputDaily drivers running an active front stage plus a subCompact installs that need four channels in one chassis

Pros

Four channels cover a full front stage or front plus rear
High-bias Class AB design favors a warm, natural tone
Bridging two channels adds subwoofer power without a second amp
Suits compact sound-quality installs

Cons

Class AB runs hotter and draws more current than Class D
Larger and heavier than comparable Class D four-channels
Needs solid electrical support and ventilation in tight spaces

Crescendo REVOLUTION 3A4 4-Channel Amplifier prices at every store

Audio IntensityNew
In stock
$379.99Checked Nov 11
Visit Audio Intensity

Crescendo REVOLUTION 3A4 4-Channel Amplifier price history

Lowest price we've seen: $379.99 on Nov 11 at Audio Intensity. Tracked across 1 store since Nov 11.

About the Crescendo REVOLUTION 3A4 4-Channel Amplifier

The Crescendo REVOLUTION 3A4 is a 4-channel car amplifier. It uses a high-bias Class AB topology.

Its sound is natural, dynamic and transparent. It suits high-fidelity daily drivers and compact sound-quality installs.

Channels: 4
Topology: High-bias Class AB
Sonic character: Natural, dynamic and transparent
Best for: High-fidelity daily drivers and compact SQ installs

Specifications

Topology / Class: High-Bias Class AB
Sonic Character: Natural, Dynamic, and Transparent

Questions and answers

What does high-bias Class AB mean for sound?: The output devices run with more standing current than a standard Class AB amp. Crescendo says this gives a natural, dynamic and transparent character, and it is the main reason sound-quality buyers pick it over a Class D amp.
Can I bridge it to power a subwoofer?: Yes. A four-channel amp can bridge into two channels, so you can run two channels on the front speakers and bridge the other two for a sub. That covers a simple front-stage-plus-sub system with one amp.
Does it run hot?: Class AB designs generate more heat than Class D, and the high bias adds to that. Mount it where air can move around the heatsink and keep the gain settings sane.
How does it compare with a Class D four-channel?: Class D amps are smaller, cooler and more efficient. The REVOLUTION 3A4 gives up some of that for the Class AB tone that sound-quality listeners tend to prefer.
What do I need to install it?: Plan on a fused power wire sized for the amp's current draw, a solid ground, RCA cables and speaker wiring. Class AB current draw is higher than Class D, so don't undersize the power cable.
Where is the Crescendo REVOLUTION 3A4 4-Channel Amplifier cheapest?: At Audio Intensity, for $379.99, as of our latest check.