Couldn't Load Pickup availability
The Zapco HB 84D is a compact 4-channel full range Class D bridgeable amplifier delivering 4 x 75W RMS at 4 ohms, from Zapco's HB series.
Key specifications
- Power at 4 ohms: 4 x 75W RMS
- Power at 2 ohms: 4 x 120W RMS
- Bridged power: 2 x 240W RMS at 4 ohms
- Frequency response: 15Hz to 30kHz ±1dB
- Signal to noise: over 95dB
- Inputs: RCA and speaker level
- Dimensions: 160 x 115 x 45mm
4-Ch. Class D Amplifier
4-channel, full range, Class D amplifier with RCA and speaker level inputs, variable input gain control and variable electronic crossover.
- Power @ 4Ω: 4 x 75 watts RMS
- THD @ Rated Power < 0.5%THD
- Power @ 2Ω: 4 x 120 watts RMS
- Power Bridged @ 4Ω: 2 x 240W RMS
- Signal to Noise Ratio > 95dB
- THD + Noise < 0.1%
- Frequency Response 15Hz to 30kHz ±1dB
- Input Sensitivity .25v to 6v (Low)
- Dimensions (mm): 160 (L) x 115 (W) x 45 (H)
If you need a 4-channel Class D option with more headroom, see the Zapco ST-104D SQ III (4 x 100W RMS).
Explore the full range in Zapco Amplifiers.
Specification
| High Level Inputs | 4 Channels |
|---|---|
| RCA Inputs | 4 Channels |
| Plug & Play Ready | Yes |
| S/N Ratio | > 95dB |
| THD | < 0.1% |
| Frequency Response | 20Hz - 20KHz |
| Amplifier Power (4 Ohm) | 4 x 75W |
| Amplifier Power (2 Ohm) | 4 x 120W |
| Input Impedance | 20 KOhm (Low), 240 Ohm (High) |
| Signal I/O Range | RCA Input 6Vpp, RCA Output 9Vpp, High-Lev. 26Vpp |
| Power Supply Cons. | DC 9V-16V, <0.1W |
| Unit Dimensions (mm) | 160(L) x 115(W) x 45.5(H) |
What's Included
- Zapco HB 84D
Zapco
About the Zapco HB 84D
From our tech experts at CEN
A 4-channel amplifier from Zapco, Class D, rated at 75w RMS.
Who it suits
Drivers building a front stage that needs each channel doing a defined job. 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.
Explore the full Zapco range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Zapco
Recommended For You
Discover more top-rated gear, handpicked to go with what you're viewing
Have it Fitted By Our Team
Our team fits car audio, stereos, dash cams and vehicle security at our workshop in Beeston, Nottingham. Tell us your vehicle and we'll confirm the parts and a fitted price.
- 1
Tell us your vehicle
Make, model and year, and what you'd like fitted.
- 2
We confirm the parts
Fascia, wiring and interfaces checked for your car, with a fitted price.
- 3
Fitted at our workshop
Bring it to our Beeston workshop and we do the rest.
Unit 25 Technology Drive, Beeston, Nottingham NG9 1LA
More from Zapco Amplifiers
More options from the same range, in stock and ready to go
Zapco HB 501D II Mono Sub Amp 1 Channel Class D Subwoofer Amplifier 1x300w RMS
£239.00
View product
Zapco HB 410 II 8A DSP Amp 10 Channel DSP 8 Channel Class A/B Power Amplifier
£349.00
Zapco ST-1B Sub Amp Mono 1 Channel Class AB Subwoofer Amplifier 200w RMS
£119.00
Zapco REF 500.1 Amp Mono 1 Channel Class AB Subwoofer Amplifier 320w RMS
RRP £1,029.00Save 2%£999.00
Zapco ST-2000XM III Amp Mono 1 Channel Class D Subwoofer Amplifier with Remote
£599.00
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: 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 HB 84D produce?
A: It delivers 4 x 75 watts RMS at 4 ohms, 4 x 120 watts RMS at 2 ohms, or 2 x 240 watts RMS bridged at 4 ohms.
Q: Can the HB 84D connect to a factory head unit?
A: Yes. It has speaker level inputs as well as RCA inputs, with variable input gain control.
Q: Does the HB 84D have a crossover?
A: Yes. It has a variable electronic crossover and a frequency response of 15Hz to 30kHz ±1dB.
Not Sure Where to Start?
Straightforward advice and the latest news from our Nottingham team.
All Guides and News →
Car Audio
Christmas Gift Guide 2026: Car Audio, Dash Cams and Outdoor Tech
Read the guide →
Car Audio
Upgrading Car Audio Without Replacing the Factory Stereo
Read the guide →
Car Audio
Amplifier Wiring Kits Explained: Gauge, Fuses and Earths
Read the guide →
Car Audio
New at CEN: Option Audio Drive-10Flat — Golf Mk8 Bass, Zero Boot Space Lost
Read more →
Car Audio
Car Speaker Sizes Explained: What Fits Your Car
Read the guide →
Car Audio
Alpine iLX-F905D Halo9 Review: The Big-Screen Upgrade for Almost Any Car
Read more →