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Deal.ai › Pioneer
Pioneer
GM-A4704 4-Channel Bridgeable Car Amplifier AB Bridgeable
Pioneer

GM-A4704 4-Channel Bridgeable Car Amplifier AB Bridgeable

4.7(48 ratings)

Best price now

$130.00at Pioneer ElectronicsChecked Nov 8

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Price facts

  • Last seen at $130.00 at Pioneer Electronics on Nov 8.

Our take on the GM-A4704 4-Channel Bridgeable Car Amplifier AB Bridgeable

The Pioneer GM-A4704 is a four-channel Class AB car amplifier rated at 40 watts RMS per channel into four speakers. It bridges its rear channels to drive a subwoofer, or runs in two-channel mode at 130 watts RMS per channel for component speakers or subs. Speaker-level inputs let it work with a factory head unit that has no preamp outputs. It suits drivers who want cleaner, louder sound from stock or upgraded speakers without a big power budget, and it is a modest step up from a head unit's built-in power rather than a high-output competition amp.

Best forUpgrading factory speakers with more clean powerAdding a subwoofer alongside four speakersKeeping a stock head unit and adding an ampBudget-minded first amp install
Pros
  • Four channels at 40 watts RMS each
  • Bridges rear channels for a subwoofer
  • Two-channel mode delivers 130 watts RMS per channel
  • Speaker-level inputs work with factory radios
  • Compact Class AB chassis fits under seats
Cons
  • Class AB design runs warmer and draws more current than Class D
  • 40 watts RMS per channel is modest for power-hungry speakers
  • No built-in DSP or digital signal processing
  • Needs a fused power run and careful gain setting

GM-A4704 4-Channel Bridgeable Car Amplifier AB Bridgeable prices at every store

  • Pioneer ElectronicsNew

    In stockReturn policy

    $130.00Checked Nov 8
    Visit Pioneer Electronics

What reviewers say

  • 4.7 / 548 ratings

Owners rate it highly, praising the clean power it adds to factory and aftermarket speakers and the flexibility of bridging for a sub. Complaints center on heat and modest per-channel output.

What people mention
  • Sound qualityPraisedOwners say it cleans up and strengthens the sound from stock and upgraded speakers.
  • BridgingPraisedReviewers like using the rear channels bridged to power a subwoofer.
  • HeatCriticisedSome owners report the amp gets warm during long, loud sessions.
  • Power outputMixedThe 40 watts RMS per channel is enough for most speakers but modest for power-hungry ones.
  • InstallationPraisedSpeaker-level inputs and a compact chassis make it easier to add to a factory system.

About the GM-A4704 4-Channel Bridgeable Car Amplifier AB Bridgeable

The Pioneer GM-A4704 is a 4-channel, Class AB bridgeable car amplifier. In 4-channel mode it powers front and rear speakers with 40 watts RMS each.

The channels can be configured in different ways. You can run the front speakers on the "A" channels and combine the "B" channels to drive a subwoofer. In 2-channel mode, it sends 130 watts RMS to each of a pair of component speakers or subwoofers.

Speaker-level inputs let you connect the amplifier to a factory-installed audio source that has no pre-amplified outputs.

Brand
Pioneer
Model
GM-A4704
Amplifier type
4-channel, Class AB, bridgeable
Power (4-channel)
40 watts RMS per channel
Power (2-channel)
130 watts RMS per channel
Inputs
Speaker-level inputs
Use
Front and rear speakers, component speakers or subwoofers

Questions and answers

Can it power a subwoofer and four speakers at once?
It drives four speakers on channels A and B, or you bridge the B channels to run one subwoofer while the A channels power front speakers. It cannot do four speakers plus a sub simultaneously.
Will it work with my factory radio?
Yes. Speaker-level inputs let it take signal from a factory head unit that has no preamp outputs.
How much power does it make in two-channel mode?
Bridged into two channels it delivers 130 watts RMS per channel, enough for a pair of component speakers or subwoofers.
Is it Class AB or Class D?
It is a Class AB amplifier, so expect more heat and current draw than a Class D design of similar output.
Do I need a wiring kit?
Yes. You need a fused power wire from the battery, a ground, speaker wiring and RCA or speaker-level signal cables.
Is it worth it over head unit power?
For most factory or modest aftermarket speakers, yes. It adds clean headroom that a head unit alone cannot provide.
Where is the GM-A4704 4-Channel Bridgeable Car Amplifier AB Bridgeable cheapest?
At Pioneer Electronics, for $130.00, as of our latest check.
What do buyers say about the GM-A4704 4-Channel Bridgeable Car Amplifier AB Bridgeable?
Rated 4.7 out of 5 from 48 ratings.

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