Zapco ST-501D SQ MINI Sub Amp 1 Channel Class D Mono Subwoofer Amplifier
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The Zapco ST-501D SQ MINI is a mono Class D subwoofer amplifier in a micro-chassis design, rated at 180W RMS at 4 ohms, 320W RMS at 2 ohms and 530W RMS at 1 ohm. It is part of Zapco's SQ MINI range of compact amplifiers.
Matching 4-channel amps in the same SQ MINI series include the ST-104D SQ range from Zapco.
Key specifications
- Model: ST-501D SQ MINI
- Channels: 1 (mono), Class D
- Power @ 4 ohms: 180W RMS
- Power @ 2 ohms: 320W RMS
- Power @ 1 ohm: 530W RMS
- Signal to noise ratio: >100dB
- Frequency response: 15Hz – 250Hz ±1dB
- Dimensions: 86 x 42 x 206 mm (W x H x L, overall)
ST-501D SQ MINI
A compact mono Class D amplifier built for subwoofer duty. Serious output from a very small footprint, and two units can be strapped together for even higher output.
- RCA level input
- Remote control included
- Variable input gain control
- Variable electronic crossover
- Bass boost
- Subsonic filter
- Micro chassis
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Specification
| Power @ 4Ω | 180 watts |
|---|---|
| Power @ 2Ω | 320 watts |
| Power @ 1Ω | 530 watts |
| Frequency Response | 15Hz to 250Hz ±1dB |
| Net Dimensions (mm) | 86(W) x 42(H) x 188(L) |
| Overall Dimensions (mm) | 86(W) x 42(H) x 206(L) |
More specs
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What's Included
- Zapco ST-501D SQ MINI
Zapco
About the Zapco ST-501D SQ MINI
From our tech experts at CEN
The Zapco ST-501D SQ MINI is a single-channel Class D subwoofer amplifier in a micro-chassis, measuring 86 x 42 x 206 mm overall. It delivers 180W RMS at 4 ohms, 320W RMS at 2 ohms and 530W RMS at 1 ohm, with a 100dB signal-to-noise ratio. Two units can be strapped together for greater output.
Who it suits
Best suited to builds where boot space is limited but clean bass output matters. The compact footprint makes it easy to fit behind a panel or under a seat. For higher sustained power, the Zapco HB 501D II offers 300W RMS in a standard chassis.
Our tech experts advise
At 86 x 42 x 188 mm (net), this amp tucks into tight spaces with ease. It includes a variable electronic crossover (15Hz–250Hz), bass boost and subsonic filter, so no separate processor is required for most subwoofer setups. Connect via RCA; a remote control is included for cabin-side bass level adjustment. Installation is priced per vehicle — contact us about fitting.
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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 ST-501D SQ MINI produce?
A: It is rated at 180 watts at 4 ohms, 320 watts at 2 ohms and 530 watts at 1 ohm.
Q: Can two ST-501D SQ MINI amplifiers be linked?
A: Yes. Two units can be strapped together for higher output.
Q: Does the ST-501D SQ MINI accept speaker level inputs?
A: Its listed input is RCA level. For a factory head unit without RCA outputs, a line output converter is needed.
