Hertz Audio 1000W SP4.900 Advanced Motorcycle Class D Amplifier
Hertz Audio 1000W SP4.900 Advanced Motorcycle Class D Amplifier
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Hertz Audio 1000W SP4.900 Advanced Motorcycle Class D Amplifier
The Hertz SP 4.900 is a compact four-channel Class D amplifier from Hertz, built for powersports use and sold here for motorcycle audio. It uses the Hertz ADC (Advanced D-Class) output stage.
Compact 4-channel amp in an IP55 aluminum chassis
160 W RMS x 4 at 4 ohm, or 500 W RMS x 2 bridged, with a built-in speaker simulator for factory radios.
- 160 W RMS x 4 at 4 ohm / 500 W RMS x 2 bridged
- Up to 85% efficiency, IP55, no cooling fan
- Built-in USS on the high-level inputs
Key Product Details
| Brand | Hertz |
| Channels | 4 |
| Output (4 ohm) | 160 W RMS x 4 |
| Bridged (4 ohm) | 500 W RMS x 2 |
| Size | 211.6 x 130 mm (8.3 x 5.1 in) |
| Efficiency | Up to 85% |
| Chassis | IP55-certified aluminum, no cooling fan |
Output figures are as listed for 4 ohm loads.
Using the SP 4.900 With a Factory Radio
The built-in Universal Speakers Simulator (USS) on the high-level inputs lets the amp work with OEM head units that mute or shut down on speaker-load detection. Turn-on is automatic, from remote-in or from DC offset sensing on the speaker inputs, so a remote wire is not the only way to switch it on.
Specifications
| Output stage | Hertz ADC (Advanced D-Class) |
| Power, 4 channel | 160 W RMS x 4 at 4 ohm |
| Power, bridged | 500 W RMS x 2 at 4 ohm |
| Size | 211.6 x 130 mm (8.3 x 5.1 in) |
| Efficiency | Up to 85% |
| Chassis | IP55-certified aluminum, no cooling fan |
| Input feature | Universal Speakers Simulator (USS) on high-level inputs |
| Turn-on | Remote-in or DC offset sensing on speaker inputs |
| Filters | High-pass and low-pass, 50 Hz-5 kHz at 12 dB/oct |
| Bass boost | 0-8 dB |
Related Paths
Hertz SP 4.900 FAQ
How much power does the SP 4.900 make?
160 W RMS x 4 at 4 ohm, or 500 W RMS x 2 at 4 ohm bridged.
Will it work with a factory radio?
The built-in USS on the high-level inputs lets it work with OEM head units that mute or shut down on speaker-load detection.
How does it turn on?
Automatically, by remote-in or by DC offset sensing on the speaker inputs.
How big is it and is it weather protected?
It measures 211.6 x 130 mm (8.3 x 5.1 in) in an IP55-certified aluminum chassis with no cooling fan.
What filters does it have?
High-pass and low-pass filters from 50 Hz to 5 kHz at 12 dB/oct, plus a 0-8 dB bass boost.
Need Help Choosing?
Tell us your bike, model year and what you want to add, and we will confirm fitment and the right parts before you order.