Hertz HMP4D-SS Amplifier Prewired for SoundStream HDHU14+ Headunit for Batwing Fairing


  • Plug-&-Play Kit For 2014-2022 Harley-Davidson Street Glides with HDHU14+ headunit
  • Prewired into SoundSteam radio harness, also includes power and ground to battery connected to amp
  • $100 core charge will be charged if this package is not shipped with a SoundStream radio. The core charge will be refunded as soon as we get the harness back. A prepaid return label will be sent with the amp for the return of the harness.
  • More Features!

10 in stock


HERTZ HMP4D Amp + Plug-&-Play Harness for SoundStream HDHU14+ Radio

Prewired to the SoundStream radio harness and comes with all mounting materials to make your installation as easy as possible. The gains and high pass filters are also set correctly to the correct settings needed for the HDHU14+ radio. Amplifier power and ground wires are also already connected so all you have to do is plug into the radio harness and then run power and ground and your amplifier is working. 

We have completed all the hard work for you. This is a true plug and play set up so you just have to plug it in and you have everything working and set so they are a perfect match.

Works for 2014-2022 Harley Davidson Street and Electra Glides.

If this amp is being purchased without a radio, there will be a $100 core charge added to the price of the amp until the original SoundStream Reserve HDHU14+ wiring harness is received back to us. We will provide a prepaid shipping label to make this an easy core return for you. We need these harnesses back in order to make complete radio/amplifier kits.

We will contact you regarding this charge after purchase but before shipping to you.

Thanks to the ultra-compact cast-aluminium chassis (IP64 rated), the HMP4D amplifier is nature-proof, being the ideal choice motorcycle installations. It features an incredible power/size ratio and an easy setup thanks to the integrated crossover filter. The Front End section features a complete and bypassable crossover system, providing full system design flexibility with or without external processors, offering the user endless connection possibilities with any source. Inputs feature a special balanced circuitry, ensuring high rejection against electro-magnetic interferences, for noise-free results.

NATURE PROOF: Engineered and tested for the real environment of application (UV, salt-fog, vibrations, high/low temperature, thermal shock, dust).

COMPACT, CAST-ALUMINUM CHASSIS: Compact, cast-aluminum chassis (IPX6 rated), making them the ideal choice for powersports/marine/motorcycle installations.

BASS BOOST: Bass Boost adjustable via selector, for more punch from speakers.

Output Power (RMS) @ 14.4 VDC: 60 W x 4 (4 Ω), 75 W x 4 (2 Ω), 150 W x 2 (4 Ω)

Vehicle Information

• 2014–2021 Harley-Davidson Electra Glide
• 2014-2021 Harley-Davidson Street Glide

Additional information

Weight 3.77 lbs
Dimensions 12.70 × 6.25 × 3.00 in


Website Bullet 2

Product Type:Motorcycle Amplifier

Website Bullet 1

Brand:Volunteer Audio