Hertz 6.5″ SX165NEO, SV165NEO 6.5″ & 6×9″ SX690NEO 6-Speaker + Grille Replacement For Ultra Limited CVO Boom 2 + SoundStream HDHU.14Si Radio + Metra BC-HDLFPP Lower Pods & Prewired Amp For 2015-2023 Harley Davidson® Road Glide WITHOUT Power Lid Locks

Starting at $3,901.92

Hertz 6.5″ SX165NEO & SV165NEO 6.5″ & 6×9″ SX690NEO Speakers + Hertz Replacement Grilles + American Hardbag Adapters + Prewired Amplifier + Metra HDLFPP Lower Pods + SoundStream HDHU.14Si Radio + The Polarity Tester
  • 6-Speaker Factory Replacement For Harley Davidson® Road Glide
  • Prewired amp so all you have to do it connect power and ground to battery and connect remote wire. All other wiring is complete.
  • SoundStream HDHU.14Si radio retains thumb controls


Boom Stage 1 – Comes mostly on bikes with factory tour pack speakers, you will have a total of 4 speakers and 1 amplifier. You will also be able to tell by the speakers only having one positive and one negative connection. Having Boom Stage 1 you can change only the amplifier and leave the factory speakers.

Boom Stage 2 – Comes mostly on bikes with factory saddlebag speakers, there will normally be a total of 6 speakers (uppers, lowers and saddlebag) with 3 amplifiers or 4 speakers (uppers and saddlebag) with 2 amplifiers. Each speaker will also have a total of 4 connections; the tweeter and the woofer are both wired to the amplifiers with separate connections. Having Boom Stage 2 you will have to change the amplifier and the speakers at the same time.

This Volunteer Audio Boom Stage 2 plug & play amplifier and speaker package includes the prewired amp, the speaker polarity tester, the SoundStream HDHU14.Si radio, 1 set of 6.5″ SX165NEO speakers with a set of Hertz HRGSG replacement grilles to replace your factory front fairing, 1 set of 6×9″ SX690NEO speakers with American Hardbag adapters for your lid speakers, 1 set of SV165NEO 6.5″ lower speakers with Hertz MPG165.3 grilles, and Metra BC-HDLFPP air cooled lower fairing speaker pods. All necessary wiring is included in the package, you will not need any other wiring or hardware to complete this installation.

The American Hardbag adapters included in this package are for Harley Davidson® motorycycles without power lid locks. 

Product Features:


  HDHU.14si model lets you gain/retain factory features you’d otherwise lose when installing a different headunit. Check out your hog’s Engine Performance and Monitor Data such as; Tire Pressure, Battery Voltage, Dual-Function Handlebar Controls, Track Pack Gauges, and the ability to turn on Factory Amplifiers for CVO, Boom 1, and Boom 2 Systems.

External Module Required for HDHU.14si


-Android Auto


-Handlebar Controls Interface Read

-Plug & Play Wiring harness

-IPx5 Waterproof Faceplate

-4-Volt RCA Audio Output


 Fits 6.5” to 6.75” speakers for Harley-Davidson® 2014-up

Molded tray fits OEM and Saddle Tramp lower fairings

Includes ported enclosure and tunes to maximize bass response

Painted a complimentary matte black finish

Sold as a pair


6.5” to 6.75” universal speaker grille
Metal mesh grille with matte black finish
This is the same grille supplied with BC-HDLFP
Sold in pairs and includes mounting hardware


American-Made Stainless Steel and Aluminum Hardware

Adapter design strength is 20X stronger than other two-piece adapters

Built for larger, high-performance speakers

Gaskets Included

Front speaker spacer for 6×9’s that do not have one incorporated or included

Waterproof & Air Tight

(1) Set of 5×7 to 6×9 speaker adapters for lids

(1) Hardware pack


Totally new NEO SPL coaxial SX 165 NEO cone is made with nature-proof high stiffness pressed-paper featuring innovative water/humidity resistant and anti-UV treatments. The double layer copper voice coil, wound on polyamide former ensures unparalleled power handling. New motors units are made of special Neodymium N38 H to obtain a minimum bulk and increased performance. SX 165 NEO features a large Hi-SPL 1.4” PEI dome tweeter with resettable solid-state protection circuit and a protective rubber gasket for high SPL and a safe outdoor use.


1New SV 165 NEO features compact dimensions and light weight preserving excellent performance thanks to the use of Neodymium N38 H for the motor units. To allow a safe outdoor use without discoloration over time, cones has waterproofing and anti-UV treatment and motor units is painted with cataphoresis with insulated lead-wires to avoid oxidation. The terminals and mounting holes are compatible for installation on Harley-Davidson motorbikes!


SX 690 is a real beast with an Hi-SPL Mid-Hi unit based on 1.4” dome tweeter and 1” dome supertweeter with resettable solid-state protection circuit. Cone are made with nature-proof high stiffness pressed-paper featuring innovative water/humidity resistant and anti-UV treatments. The double layer copper voice coil, wound on polyamide former ensures unparalleled power handling. New motors units are made of special Neodymium N38 H to obtain a minimum bulk and increased performance.


SP 4.900 is the first Hertz amplifier featuring the renewed Hertz ADC (Advanced D-Class) output stage, reaching up to 85% efficiency and delivering an impressive power rating of 160 x 4 (4Ω) W RMS or 500 W x 2 (4Ω) W RMS when bridged, with an ultra-compact size of 211.6 (8.3) x 130 (5.1) mm (in.). Being ultra-compact with an impressive power, SP 4.900 is the ideal choice for Motorcycle application.

Hertz ADC technology ensures SP 4.900 overtakes the usual ultra-compact amplifier performances, delivering an outstanding 105 dBA S/N Ratio and 0.02% THD specifications, and almost completely eliminating EMI and RFI noise, for peerless sound quality.


ATOM MINI amplifiers adopt the most exemplary Korean Class-D performance, reliability, and this compact footprint fits inside your motorcycle’s fairing. At first glance, you’ll notice several key improvements. All pre-amp & crossover options are conveniently located on one side of this amplifier, while quick-disconnect connection plugs for power and speakers outputs are on the other. You might not notice additions to the circuit board, including improved internal power supply & output stage components. We know you want it loud…

State-of-the-Art Class D IC Amplifier Technology

2-Ohm Stereo & 4-ohm Bridged Stable Amplifier

Quick Disconnect 8g Power & 14g Speaker Wire Harness

200mV-6V Low-Level RCA Input Harnesses Included

Signal Sensing Turn-On on Hi/Speaker Level Input

Optional Variable 12dB/Octave High-Pass Crossovers

Optional Variable 12dB/Octave Low-Pass / Band-Pass Crossover

Low-Level RCA Output Harness for Daisy Chained Applications


Vehicle Information

• 2015-2023 Harley-Davidson Road Glide :

Additional information

Weight 17.65 lbs
Dimensions 15.25 × 12.00 × 21.00 in