Velocity RZP1500.4 4 Channel Razor Pro Amplifier with Plug & Play Wiring for 2023.5-Up Harley Davidson® Touring Motorcycles

VELOCITY RZP1500.4 4-CHANNEL AMPLIFIER

COMPACT SIZE. SERIOUS POWER.

The Velocity RZP1500.4 delivers an incredible amount of clean power from an extremely compact, fully sealed aluminum chassis.

Producing up to 350 watts RMS x 4 at 2-ohm, this amplifier gives you the power and flexibility to build a serious Harley-Davidson audio system without taking up valuable space inside the fairing.

Don’t let the size fool you — this is a very powerful amplifier.

With its rugged aluminum chassis, fanless cooling design, sealed connections, IP65-rated construction and extensive crossover and input controls, the RZP1500.4 is truly designed for high-performance motorcycle and powersports audio.

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POWER OUTPUT

• 200 watts RMS x 4 @ 4-ohm
• 350 watts RMS x 4 @ 2-ohm
• 600 watts RMS x 2 bridged @ 4-ohm
• Rated at 14.4VDC
• Frequency Response: 20Hz–20kHz
• Total Harmonic Distortion: <0.1%
• Signal-to-Noise Ratio: >85dB

That’s an enormous amount of usable power from such a compact amplifier.

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RUN UP TO 8 4-OHM MIDS & HIGHS FROM ONE AMPLIFIER

Don’t let the fact that this is a 4-channel amplifier fool you.

Because the RZP1500.4 is capable of producing 350 watts RMS x 4 at 2-ohm, it can be configured with two 4-ohm speakers in parallel per channel, allowing one amplifier to power up to eight 4-ohm mids and highs.

That means you can build a complete 8-speaker Harley-Davidson system with:

• Upper fairing speakers
• Lower fairing speakers
• Tour-Pak speakers
• Saddlebag lid speakers

All powered from one incredibly compact amplifier.

With two 4-ohm speakers connected in parallel to each channel, the amplifier sees a 2-ohm load and produces up to 350 watts RMS per channel, with that power shared between the two speakers connected to that channel.

For riders wanting a large mids-and-highs system without multiple amplifiers, this is an extremely clean and powerful solution.

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OR RUN 4 MIDS & HIGHS + SUBWOOFERS

Want serious bass instead?

The RZP1500.4 can also be configured with the front two channels powering up to four 4-ohm mids and highs, while the rear two channels are used to power a pair of subwoofers.

This makes the RZP1500.4 an excellent amplifier for our American Hard Bag / Velocity Modular Bass System when building a 4-speaker-plus-subwoofer configuration.

Whether you want up to eight mids and highs or four mids and highs plus serious subwoofer power, the RZP1500.4 gives you tremendous flexibility from a single compact amplifier.

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TRULY BUILT FOR MOTORCYCLES — FANLESS, SEALED & ALL-WEATHER

The RZP1500.4 was designed for the environment it’s actually going to live in.

The amplifier uses a fanless thermal design. There is no cooling fan and no fan opening in the amplifier chassis, allowing the enclosure to remain sealed from the outside environment.

That’s a major advantage on a motorcycle.

Many high-powered amplifiers used in Harley-Davidson applications rely on cooling fans and ventilation openings. Those designs can work well in protected environments, but motorcycles can expose an amplifier to rain, moisture, road spray, dust and dirt.

The Velocity RZP1500.4 is different.

The rugged aluminum chassis acts as the amplifier’s heat sink, allowing it to dissipate heat without requiring an exposed cooling fan or ventilation opening.

Combined with its IP65-rated construction and sealed outboard electrical connections, this creates an amplifier genuinely designed for riders who actually ride.

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CAUGHT IN THE RAIN? KEEP RIDING.

Motorcycle audio equipment shouldn’t require perfect weather.

Whether you intentionally ride in the rain or simply get caught in an unexpected storm, the RZP1500.4 was designed with the motorcycle environment in mind:

• Fanless cooling design
• No exposed cooling-fan opening
• IP65-rated construction
• Sealed amplifier chassis
• Sealed outboard electrical connections
• Protective end cap covering gains, crossovers and adjustments
• Rugged aluminum chassis designed to dissipate heat
• Built for exposure to the real-world motorcycle environment

This isn’t simply a powerful car amplifier that happens to fit inside a Harley-Davidson.

It’s an all-weather amplifier designed for riders.

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FULL AMPLIFIER CONTROL

The RZP1500.4 provides independent controls for the front and rear channel pairs, including:

• Independent front and rear gain adjustment
• High-pass crossover
• Low-pass crossover
• Full-range operation
• Adjustable crossover frequency from 40Hz–400Hz
• High-level or low-level input selection
• DC-offset signal sensing for remote turn-on
• Traditional wired 12V remote turn-on
• Low-level input sensitivity: 0.7V–6V
• High-level input sensitivity: 1.2V–10V
• Thermal, overload and short-circuit protection

This gives the installer the flexibility to configure the RZP1500.4 for a wide variety of motorcycle audio systems.

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AMPLIFIER ONLY — UPGRADED OFC POWER & GROUND HARNESS INCLUDED

This listing is for the Amplifier Only version.

It does not include Volunteer Audio’s bike-specific speaker/input T-harnessing, amplifier mounting components or Volunteer Audio pre-tuning.

However, every RZP1500.4 includes our upgraded battery-to-amplifier power and ground harness.

An amplifier capable of producing this much power requires a serious electrical connection. An undersized power or ground cable can cause voltage drop and prevent the amplifier from reaching its full potential.

That’s why we include a properly engineered, upsized Oxygen-Free Copper (OFC) power and ground harness.

The included harness features:

• Upsized Oxygen-Free Copper (OFC) power and ground cable
• Proper wire gauge for the amplifier’s current requirements
• Correct cable length for motorcycle installation
• Properly sized fuse protection
• Direct battery positive and negative connections
• Sealed connection to the amplifier
• We don’t want you guessing about wire gauge, cable length or fuse size.
• Proper power and ground wiring is required for this amplifier to produce its full potential, so we include it with the amplifier.

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IMPORTANT — LITHIUM TITANATE BATTERY STRONGLY RECOMMENDED

Volunteer Audio strongly recommends upgrading to a Lithium Titanate (LTO) battery when installing this amplifier in a Harley-Davidson application.

The factory Harley-Davidson battery was not designed to provide the sustained current required by an amplifier capable of this level of output.

An inadequate battery can cause excessive voltage drop and starve the amplifier for power. This prevents the amplifier from reaching its full potential and, when continually operated with an inadequate electrical supply, can contribute to premature amplifier failure.

If you’re building a serious high-output motorcycle audio system, the electrical system needs to be capable of supporting it.

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AMPLIFIER ONLY MEANS YOU DO THE TUNING

When purchasing the Amplifier Only version, the amplifier’s gains and crossover/filter settings are not pre-tuned by Volunteer Audio.

The installer is responsible for properly configuring:

• Gain settings
• High-pass filters
• Low-pass filters
• Full-range settings
• Input configuration
• Channel configuration

With an amplifier capable of producing this much power, proper tuning is extremely important. Incorrect gain or crossover settings can reduce sound quality and performance and can potentially damage your speakers.

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WANT IT TRULY PLUG-AND-PLAY?

Volunteer Audio also offers the Velocity RZP1500.4 in complete Plug-and-Play Packages for supported Harley-Davidson models.

Our Plug-and-Play Packages include the amplifier and upgraded OFC power/ground harness plus the appropriate bike-specific speaker/input T-harnessing, amplifier mounting components and other application-specific integration parts.

But at Volunteer Audio, plug-and-play means more than just providing harnesses.

WE PRE-TUNE THE AMPLIFIER FOR YOUR EXACT SYSTEM.

When you purchase one of our complete Plug-and-Play Audio Packages, Volunteer Audio configures the amplifier specifically for the speakers and equipment included in that system.

We properly configure:

• Gain structure
• High-pass filters
• Low-pass filters
• Channel configuration
• Input configuration
• Other system-specific amplifier settings

Your amplifier arrives pre-tuned for the exact system you’re purchasing.

No guessing about gains.

No guessing about crossover settings.

No cutting or splicing into the factory speaker wiring.

That’s what Volunteer Audio means by truly plug-and-play.

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AMPLIFIER ONLY VS. VOLUNTEER AUDIO PLUG-AND-PLAY

AMPLIFIER ONLY

Includes:

• Velocity RZP1500.4 amplifier
• Upsized OFC battery power & ground harness
• Proper fuse protection

You handle:

• Speaker/input wiring
• Bike-specific integration
• Amplifier mounting
• Gain and crossover tuning

VOLUNTEER AUDIO PLUG-AND-PLAY PACKAGE

Includes:

• Velocity RZP1500.4 amplifier
• Upsized OFC power & ground harness
• Proper fuse protection
• Bike-specific plug-and-play speaker/input T-harnessing
• Required mounting and integration components

Amplifier pre-tuned by Volunteer Audio for the exact system being purchased

If you’re an experienced installer and want to design, wire and tune your own system, choose Amplifier Only.

If you want Volunteer Audio to take the guesswork out of the installation, choose one of our complete Plug-and-Play Packages.

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2-YEAR VELOCITY WARRANTY

The Velocity RZP1500.4 is backed by a 2-year Velocity warranty.

Compact footprint. Massive output. Up to eight 4-ohm speakers. Fanless. Sealed. All-weather. Built for serious motorcycle audio.