Summit Audio
ZAPCO ST-5B Amplifier
ZAPCO ST-5B Amplifier
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Built for the Bush, Backed by Experts
Built for the Bush, Backed by Experts
- Genuine Local Support: We aren't just a website; we’re 4WD enthusiasts based in Surry Hills, NSW.
- Free Australia-Wide Shipping: We ship every order across the country at no extra cost to you.
- Fitment Guarantee: We only stock gear we’ve tested on our own rigs to ensure it fits your Toyota perfectly.
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The ZAPCO ST-5B amplifier has been designed to deliver outstanding sound quality for daily listening, showcasing a sleek design, exceptional value for money, and reliability. It’s a 5-channel, Class-AB full-range amplifier, stable into 4 OHMS bridged or 2 OHMS stereo load.
The extruded aluminium casing keeps it lightweight while dispersing heat effectively. With a dependable MOSFET power supply, it ensures consistent performance on every drive.
The ST-5B also includes RCA and OEM speaker-level inputs, variable input gain control, a full/LP/HP electronic crossover, and variable bass boost, giving your speakers and subwoofers increased clarity, depth, and impact.
Specifications:
- Power @ 4Ω: 4 x 70 + 1 x 250 watts
- Power @ 2Ω: 4 x 100 + 1 x 400 watts
- Power @ 4Ω Bridged: 2 x 180 + 1 x 400 (2Ω)
- THD at Rated Power: < 0.2%
- Signal-to-Noise Ratio: > 90 dB
- Channel separation: > 45 dB
- Frequency Response: 10 Hz to 30,000 Hz ± 1 dB
- Input Sensitivity: .25 V to 5 V
- Dimensions in mm: 182 (W) x 52 (H) x 351 (L) Overall: 182 (W) x 52 (H) x 381 (L)
Frequently Asked Questions
What makes the Zapco ST-5B an ideal amplifier for a 4WD audio upgrade?
The Zapco ST-5B is a versatile 5-channel system amplifier from the Studio series that allows you to drive your entire vehicle's audio upgrade from a single, compact chassis. It combines four channels of efficient full-range amplification for your front and rear door speakers with a dedicated, high-power subwoofer channel, eliminating the need to mount multiple bulky amplifiers under seats or behind panels.
What are the power output specifications of this 5-channel amplifier?
The amplifier delivers clean, reliable multi-channel power. When running a standard 4-ohm speaker setup, it produces 90 Watts RMS across the 4 main channels plus a robust 200 Watts RMS on the subwoofer channel. For higher demands, it can scale to 125 Watts RMS x 4 at 2-ohms, while the dedicated subwoofer section steps up to a heavy-hitting 350 Watts RMS at 2-ohms to drive an aftermarket sub enclosure.
Can I connect this amplifier to my factory LandCruiser head unit?
Yes, you can. The Zapco ST-5B features switchable high-level speaker inputs alongside standard low-level RCA inputs. This integration flexibility means you don't need to buy expensive external line output converters to connect to your stock Toyota factory dashboard touchscreen; you can splice directly into the factory speaker wiring loops to feed clean signal into the amplifier.
What tuning controls are built into the Studio series amplifier?
To protect your speakers and achieve optimum cabin acoustics, the ST-5B features variable high-pass filters (HPF) and low-pass filters (LPF) across the speaker channels, as well as a dedicated subsonic filter on the subwoofer channel to prevent distortion from ultra-low frequencies. It also includes an adjustable bass boost control to dial in low-end punch according to your musical tastes.
Where is the best place to mount this amplifier in a LandCruiser or Hilux cabin?
Thanks to its optimized chassis profile, this amplifier is ideal for hidden custom fitments. Common installation layouts include mounting it flat under the driver or passenger seat, or building it into the rear cabin wall structure on dual-cab 79 Series or Hilux models. Always ensure there is a small pocket of clear space around the heavy-duty aluminum heatsink fins to allow for passive air cooling during hot touring days.
