Zapco REF 500.1 Amp Mono 1 Channel Class AB Subwoofer Amplifier 320w RMS
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The Zapco REF 500.1 is a mono, single-channel Class AB subwoofer amplifier rated at 320W RMS at 4 ohms and 550W RMS at 2 ohms. It is part of Zapco's Reference Series, built for sound-quality-focused subwoofer applications.
Key specifications
- Model: REF 500.1
- Channels: 1 (mono), Class AB
- Power @ 4 ohms: 1 x 320W RMS
- Power @ 2 ohms: 1 x 550W RMS
- THD at rated power: <0.02%
- Signal to noise: over 103dB
- Frequency response: 10Hz – 40kHz ±1dB
- Input sensitivity: 0.5V – 8V
- Fuse rating: 2 x 40A
- Dimensions: 210 x 62 x 416 mm (W x H x L)
REF 500.1
1-Ch. Class AB High-End Amplifier
Zapco's Reference Series was originally conceived to replace the Studio Series, with the first range completed in 2001. Initially called AG, it was Zapco's first attempt to bring the qualities of their legendary amplifiers to a more accessible price point, and it was very well received.
The current Reference Series builds on that foundation, targeting high audio performance at its price point. It comprises four models spanning 1, 2, 4 and 6 channels, with a revised design and carefully selected internal components. If you need to power the rest of your system, the Zapco ST-4B offers a Class AB full-range option for the remaining channels.
Features
- 1-channel, Class AB high-end amplifier
- Signal to noise ratio of over 103dB
- High-quality bipolar-input dual op-amp
- High-quality, high-transition-frequency transistors
- High-precision 0.1% output resistors
- High-density, low-loss-factor input capacitors
- Low internal resistance power capacitors
- Ultra-low on-resistance, fast-switching MOSFETs
- High-power pure copper transformers
- Low resistance fuses
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Specification
| Power RMS @ 4Ω | 1 x 320 watts |
|---|---|
| Power RMS @ 2Ω | 1 x 550 watts |
| Frequency Response | 10Hz to 40,000Hz ±1dB |
| Input Sensitivity | 0.5V to 8V |
| Fuse Rating | 2 x 40A |
| Overall Dimensions (mm) | 210(W) x 62(H) x 416(L) |
More specs
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What's Included
- Zapco REF 500.1
Zapco
About the Zapco REF 500.1
From our tech experts at CEN
A monoblock subwoofer amplifier from Zapco, Class AB, rated at 320w RMS.
Who it suits
Anyone driving a subwoofer that needs controlled, honest power. Zapco amplifiers are bought by people who care what the power figure actually means rather than what it says on the box.
Our tech experts advise
Matching the amplifier to the speakers matters more than headline watts, and gains want setting with a meter. It needs a fused feed from the battery on the correct cable gauge. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
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Frequently Asked Questions
Q: How do I choose the right amplifier for my speakers or subwoofer?
A: Match the amplifier's RMS output per channel to the RMS handling of your speakers or subwoofer at the same impedance. The Specification tab lists the power figures. If in doubt, contact CEN with your setup and we will recommend a match.
Q: What wiring do I need to install this amplifier?
A: You will need an amplifier wiring kit sized to the amplifier's power draw, typically including power and earth cable, a fuse, RCA leads and a remote wire. CEN stocks complete wiring kits, and the amplifier's fuse rating is the guide to the cable gauge required.
Q: What class of amplifier is this and does it matter?
A: Class D amplifiers are compact and efficient, ideal for subwoofers and modern installs. Class AB designs are traditionally favoured for outright sound quality on mid and high frequencies. The class is listed in the Specification tab where provided.
Q: Will an amplifier work with my factory head unit?
A: Yes, in most cases. If your head unit has no RCA outputs you will need a line output converter to feed the amplifier a clean signal. CEN stocks line output converters and can advise the right one for your vehicle.
Q: Can CEN install this amplifier?
A: Yes. CEN offers professional amplifier installation from our Nottingham premises, including secure mounting, wiring and setup. Contact us to book.
Q: How much power does the Zapco REF 500.1 produce?
A: It is rated at 1 x 320 watts RMS at 4 ohms and 1 x 550 watts RMS at 2 ohms.
Q: Is the REF 500.1 a Class D amplifier?
A: No. The REF 500.1 is a 1-channel Class AB amplifier from the Zapco Reference Series.
Q: What fuses does the REF 500.1 use?
A: It has a fuse rating of 2 x 40A. Its overall dimensions are 210mm wide, 62mm high and 416mm long.
