Reviewers praise the Hertz HMP 4D for clean, undistorted power, easy level adjustment, and ample headroom driving door and rear speakers; however, a small number report dead rear channels out of the box, so confirm operation at installation.
Buyer confidence
65%Highlights
- IP64 CERTIFICATION
- WATER JET TESTED
- CORROSION PROTECTION
- SALT FOG TESTED
Key specs
Full specs- Channels
- 4 - 2
- Power supply voltage / fuse:
- 11 ÷ 15 VDC / 1 x 15 A
- Idling current (power ON/OFF)
- 1.2 A / 0.04 mA
- Consumption @ 2 Ω, 14.4 VDC (Max Musical Power):
- 15 A
- Remote In:
- 4 ÷ 15 VDC - 1 mA
- ART:
- Automatic Remote Turn-On/Off
- Distorsion - THD (100 Hz @ 4Ω)
- 0.2 %
- Bandwidth:
- 10 ÷ 30K Hz
Key specs
Full specs- Channels
- 4 - 2
- Power supply voltage / fuse:
- 11 ÷ 15 VDC / 1 x 15 A
- Idling current (power ON/OFF)
- 1.2 A / 0.04 mA
- Consumption @ 2 Ω, 14.4 VDC (Max Musical Power):
- 15 A
Highlights
Overview- IP64 CERTIFICATION
- WATER JET TESTED
- CORROSION PROTECTION
Review highlights
Based on customer reviewsClean, powerful 4‑channel amp with good headroom — inspect on arrival
Reviewers praise the Hertz HMP 4D for clean, undistorted power, easy level adjustment, and ample headroom driving door and rear speakers; however, a small number report dead rear channels out of the box, so confirm operation at installation.
What buyers praise
- Clean, undistorted output even at high volume
- Plenty of headroom—handles max volume without distortion
What to watch for
- Some buyers reported rear channels not working out of the box—verify all channels during installation
Overview
Thanks to the ultra-compact cast-aluminium chassis (IP64 rated), the HMP 4D amplifier is nature-proof, being the ideal choice for UTV/ATV/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.
Highlights
Key features
- IP64 CERTIFICATION
- WATER JET TESTED
- CORROSION PROTECTION
- SALT FOG TESTED
Technologies
IP64 CERTIFICATION
‘
WATER JET TESTED
The protection grade IP64 define all the Hertz Marine products as totally protected against water jets of
CORROSION PROTECTION
Electronics components corrosion caused by exposure in wet environments is totally neutralized by the use of
SALT FOG TESTED
To satisfy the standards required by ASTM-B117, Hertz Marine products are tested with massive salt fog spray to
Specs
General Specs
15
| Channels | 4 - 2 |
| Power supply voltage / fuse: | 11 ÷ 15 VDC / 1 x 15 A |
| Idling current (power ON/OFF) | 1.2 A / 0.04 mA |
| Consumption @ 2 Ω, 14.4 VDC (Max Musical Power): | 15 A |
| Remote In: | 4 ÷ 15 VDC - 1 mA |
| ART: | Automatic Remote Turn-On/Off |
| Distorsion - THD (100 Hz @ 4Ω) | 0.2 % |
| Bandwidth: | 10 ÷ 30K Hz |
| S/N Ratio (A weighted @ 1 V): | 95 dB |
| Damping factor (100 Hz @ 4Ω) | 45 |
| Pre-In sensitivity: | LO: 0.2 ÷ 5 V HI: 0.8 ÷ 20 V |
| Load impedance (MIN) @ 4 Ch: @ 2 Ch: | 2Ω 4Ω |
| Max size (mm/in): | 223 x 100,5 x 43,6 / 8.77 x 3.95 x 1.71 |
| Weight (kg/lb): | 1.35 / 2.97 |
| Adjustable Crossovers | yes |
Output Power
11
| 4 Ch | 50 W x 4 (4 Ω) |
| 4 Ch | 65 W x 4 (2 Ω) |
| 3 Ch | 50 W x 2 (4 Ω) + 130 W x 1 (4 Ω) |
| 3 Ch | 65 W x 2 (2 Ω) + 130 W x 1 (4 Ω) |
| 2 Ch | 130 W x 2 (4 Ω) |
| 4 Ch | 60 W x 4 (4 Ω) |
| 4 Ch | 75 W x 4 (2 Ω) |
| 3 Ch | 60 W x 2 (4 Ω) + 150 W x 1 (4 Ω) |
| 3 Ch | 75 W x 2 (2 Ω) + 150 W x 1 (4 Ω) |
| 2 Ch | 150 W x 2 (4 Ω) |
| Total Power | 600 W |
INPUTS / FILTERS
6
| Inputs: | PRE IN |
| FRONT Ch. filters FULL: | Yes |
| Lo-Pass: | 65-85-115 Hz @ 12 dB/Oct |
| REAR Ch. filters FULL | Yes |
| Hi-Pass: | 65-85-115 Hz @ 12 dB/Oct |
| Lo-Pass: | 65-85-115 Hz @ 12 dB/Oct. |
Physical Specs
6
| mm | in |
| A | 223 | 8.78 |
| B | 207 | 8.15 |
| C | 100,5 | 3.96 |
| D | 76 | 2.99 |
| E | 43,6 | 1.72 |
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