Hertz HRC BM Wired Bass Remote for ML Power 1/5 & HMP 1D Amps

The Hertz HRC BM (Remote Control Bass Management) is a wired subwoofer level remote knob for Hertz amplifiers that carry a 3.5 mm remote-volume input - the Mille ML Power 1 mono amplifier, the subwoofer channel of the ML Power 5, and the marine/powersports HMP 1D. From a dash- or console-mounted knob it adjusts subwoofer output from -20 dB to +6 dB around a 0 dB center detent that marks the amplifier's set gain, so you can ride bass level by track or listening mood without touching the amp. It is a universal 12-volt accessory with no vehicle-specific fitment.

The module mounts under the dash or on a console, and connects to the amplifier's remote socket via an attached cable terminating in a 3.5 mm plug; Hertz supplies an extension cable for longer runs (Crutchfield lists an approximately 8 ft attached cable plus an 11.5 ft extension). Because the level change happens inside the amplifier's own volume-controlled circuit, the knob adds no noise stage to the signal path.

Sold as a single remote control. Note for HMP 1D owners: Hertz already packs an HRC BM and a 5 m extension cable in the HMP 1D box - buy this SKU to pair with an ML Power 1 or ML Power 5, or as a replacement.

Specifications

• Function: wired remote bass (subwoofer) level control
• Adjustment range: -20 dB to +6 dB with 0 dB center detent
• Connection: attached cable with 3.5 mm plug into the amplifier's remote input; extension cable included
• Compatible amplifiers: Hertz ML Power 1, ML Power 5 (subwoofer channel), HMP 1D
• Mounting: under-dash or console surface mount

Compatibility

The HRC BM works only with Hertz amplifiers that have the 3.5 mm remote-volume input: ML Power 1, ML Power 5 (controls the subwoofer channel only), and HMP 1D. It does not fit the Hertz HMP 4D, which has no remote-level input, and it is not interchangeable with the Molex-based Hertz HRC 02 (Venezia/DP amps), the HRC (HCP Compact Power amps), or the HRC BM2 (Venezia line). A remote is an accessory - it does nothing without a compatible host amplifier.

FAQ

Which Hertz amplifiers does the HRC BM control?

The Mille ML Power 1 mono amplifier, the subwoofer channel of the ML Power 5, and the marine HMP 1D - any Hertz amp with the 3.5 mm remote-volume input.

Do I need to buy an HRC BM for a Hertz HMP 1D?

No. The HMP 1D ships with an HRC BM and a 5 m extension cable in the box. Buy this SKU for ML Power 1/5 amplifiers or as a replacement remote.

Does the HRC BM work with the HMP 4D?

No. The 4-channel HMP 4D has no remote-level input; level setting on that amp is done with its onboard gain controls.

How much adjustment does the HRC BM provide?

-20 dB down to +6 dB up, with a center detent at 0 dB marking the level the amplifier was tuned to.