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A 4-channel amplifier powers four speakers or two speakers and a sub. Match RMS to your speakers.
This guide is built from Amazon product listings, not our own testing, so confirm specs on each product page.
Last updated: October 30, 2026.
Quick Picks
| Product | Type | Best for |
|---|---|---|
| Taramps TS 400×4 | 4-channel amplifier | 400W RMS at 2 ohms |
| ORION CBA2000.4 Cobalt | 4-channel Class A/B amp | 2000W rating |
| ORION CBA2500.4 Cobalt | 4-channel Class A/B amp | 2500W rating |
| ORION CEA400.4D Cobalt Elite | Compact Class D amp | 400W RMS |
| Pioneer GM-A6704 | 4-channel amplifier | 1000W max, bridgeable |
| Taramps TS 1200 | 4-channel amplifier | Full-range crossover |
Our Picks
1. Taramps TS 400×4
A 4-channel car amplifier rated 400W RMS at 2 ohms, per the listing. It was listed at about $60 on Amazon.com when we checked on October 30, 2026.
Good for: Budget speaker amplifiers. Strengths: Low price and RMS rating. Weaknesses: Lesser-known in US. Skip it if you want a big brand.
2. ORION CBA2000.4 Cobalt
A high-efficiency 4-channel Class A/B amplifier rated 2000W, per the listing. It was listed at about $100 on Amazon.com when we checked on October 30, 2026.
Good for: Power on a budget. Strengths: Low price. Weaknesses: Peak power is a maker figure. Skip it if you want compact.
3. ORION CBA2500.4 Cobalt
A high-efficiency 4-channel Class A/B amplifier rated 2500W, per the listing. It was listed at about $120 on Amazon.com when we checked on October 30, 2026.
Good for: Big systems. Strengths: High rating. Weaknesses: Peak power is a maker figure. Skip it if you want compact.
4. ORION CEA400.4D Cobalt Elite
A compact Class D 4-channel amplifier rated 400W RMS, per the listing. It was listed at about $130 on Amazon.com when we checked on October 30, 2026.
Good for: Tight installs. Strengths: Compact size and RMS rating. Weaknesses: Higher price per watt. Skip it if you want max power.
5. Pioneer GM-A6704
A bridgeable Class AB 4-channel car amplifier rated 1000W max, per the listing. It was listed at about $140 on Amazon.com when we checked on October 30, 2026.
Good for: Powering four speakers. Strengths: Pioneer brand and bridgeable design. Weaknesses: Peak power is a maker figure. Skip it if you want compact Class D.
6. Taramps TS 1200
A 1200W 4-channel car amplifier with a full-range crossover and RCA or wire input, per the listing. It was listed at about $139 on Amazon.com when we checked on October 30, 2026.
Good for: Mid-power builds. Strengths: Crossover and inputs. Weaknesses: Peak power is a maker figure. Skip it if you want compact.
How to Choose
RMS match
Match amp RMS to speaker RMS.
Class
Class D is compact; Class A/B is traditional.
Wiring
Use proper power wire; see our wire gauge guide.
What does bridgeable mean?
Two channels combine for more power.
Peak vs RMS?
RMS reflects real output.
Bottom Line
For budget, the Taramps TS 400×4. For compact, the ORION CEA400.4D. For a known brand, the Pioneer GM-A6704.
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