Velocity RZP1500.4 — 1500W 4-Channel Motorcycle Amplifier
Velocity RZP1500.4 — 1500W 4-Channel Motorcycle Amplifier
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Velocity RZP1500.4 — 1500W 4-Channel Motorcycle Amplifier
The Velocity RZP1500.4 is a 4-channel motorcycle amplifier built for Harley-Davidson touring baggers. It puts out up to 350W RMS per channel at 2 ohms from a sealed, fanless aluminum chassis rated IP65, and the 8-gauge power and ground harness is included.
4-channel amp, IP65 sealed, harness included
350W RMS x 4 at 2 ohms in a sealed, fanless aluminum chassis.
- 200W RMS x 4 at 4Ω, 350W RMS x 4 at 2Ω
- 600W RMS x 2 bridged at 4Ω
- Front and rear crossovers, 40Hz to 400Hz
Key Product Details
| Product | Velocity RZP1500.4 4-Channel Motorcycle Amplifier |
| Brand | Velocity Speaker Design |
| Channels | 4 |
| Chassis | Sealed aluminum, fanless, IP65 rated |
| Included | 8-gauge power and ground harness |
| Warranty | 2-year manufacturer warranty |
| Type | Universal amplifier, not plug and play |
This is a universal amplifier. Expect to add signal integration, mounting hardware and speaker wiring for your bike, and verify mounting space, electrical capacity and ventilation before ordering.
Planning a RZP1500.4 Install
The RZP1500.4 is rated at 200W RMS per channel at 4 ohms and 350W RMS per channel at 2 ohms. Two 4 ohm speakers wired in parallel present a 2 ohm load to a channel, and the power is shared between them. Plan your speaker loads around those ratings.
Four channels can run a four-speaker system, up to eight compatible 4 ohm speakers, or a mix of mids, highs and a subwoofer. Bridged, it makes 600W RMS across 2 channels at 4 ohms. Crossovers run high-pass, low-pass or full range from 40Hz to 400Hz, with independent front and rear gain. Inputs take high-level (1.2V to 10V) or low-level (0.7V to 6V) signal, and turn-on comes from a 12V remote or DC-offset sensing.
A high-output system needs an electrical system that can feed it, so check your charging capacity before you install.
Specifications
| RMS Power @ 4Ω | 200W x 4 |
| RMS Power @ 2Ω | 350W x 4 |
| RMS Power Bridged @ 4Ω | 600W x 2 |
| Rated Test Voltage | 14.4V DC |
| Frequency Response | 20Hz to 20kHz |
| THD | Less than 0.1% |
| Signal-to-Noise Ratio | Greater than 85dB |
| Crossover | High-pass, low-pass, full range, 40Hz to 400Hz |
| Gain | Independent front and rear |
| Inputs | High-level (1.2V to 10V) or low-level (0.7V to 6V) |
| Remote Turn-On | 12V remote or DC-offset sensing |
| Protection | Thermal, overload and short-circuit |
| Weather Rating | IP65, sealed outboard electrical connections |
| Cooling | Fanless aluminum heat sink |
Related Paths
Velocity RZP1500.4 FAQ
How much power does the RZP1500.4 make?
It is rated at 200W RMS x 4 at 4 ohms, 350W RMS x 4 at 2 ohms, and 600W RMS x 2 bridged at 4 ohms.
Is the RZP1500.4 plug and play?
No. American Hard Bag lists it as a universal amplifier. Your install may need extra wiring, signal integration, mounting hardware or adapters.
Is it waterproof?
It has a sealed aluminum chassis rated IP65, with fanless cooling and sealed outboard electrical connections.
What comes in the box?
The amplifier and an 8-gauge power and ground harness. Bike-specific speaker adapters, mounting brackets and integration parts are not included.
What bikes is it listed for?
American Hard Bag lists it for Street Glide, Road Glide, Electra Glide, Road King and other Harley-Davidson touring models, plus custom motorcycle and powersports builds.
How many speakers can it run?
Four channels run a four-speaker system. American Hard Bag says it can drive up to eight compatible 4 ohm speakers, or a mix of mids, highs and a subwoofer.
What warranty does it have?
A 2-year manufacturer warranty against manufacturing defects.
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.
Similar Products
RZP1500.4 or RZP2000.6: Pick by What You're Powering
Both Velocity amps make the same power per channel. The difference is channel count.
- RZP1500.4: four channels. Run a four-speaker fairing and lid system, up to eight 4-ohm speakers, or a mix of mids, highs and a sub.
- RZP2000.6: six channels, with 5 and 6 set aside for subs. The pick when bass is part of the plan.
Planning subs now or later? Look at the RZP2000.6 before you wire twice. Compare every option in motorcycle amplifiers.
What It Takes to Finish the Install
The box has the amp and the 8-gauge power and ground harness. Bike-specific speaker adapters, brackets and integration parts are not included.
- Saddlebag wiring: the American Hard Bag 4-channel saddlebag harness covers 1998-2023 bags.
- Plug and play: GBS builds the harness. 1998-2013 with an aftermarket radio, 2014-2023 with stock or aftermarket, 2024-Present with the stock radio.
- Power: four channels at 2 ohms pull hard. A drop-in lithium battery keeps voltage up.
Not sure what your bike needs? Start a build and we'll spec it.
More Velocity RZP1500.4 — 1500W 4-Channel Motorcycle Amplifier Questions
Should I get the RZP1500.4 or the RZP2000.6?
The RZP1500.4 covers a four-speaker system or up to eight 4-ohm speakers. If you're adding subwoofers, the RZP2000.6 gives you two extra channels set up for subs.
Can GBS make the RZP1500.4 plug and play?
Yes. Out of the box it's a universal amp, but GBS builds the plug-and-play harness for 1998-2013 bikes with an aftermarket radio, 2014-2023 with a stock or aftermarket radio, and 2024-Present with the stock radio.
Do I need a battery upgrade for the RZP1500.4?
American Hard Bag says to check your charging capacity before installing a high-output system. GBS carries drop-in lithium batteries for 1998-Present Harley touring bikes.