Hertz SPL Show SP 1.900 Mono Amp Class D 1 Channel Subwoofer Amplifier 1000w RMS
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The Hertz SPL Show SP 1.900 is a Class D mono subwoofer amplifier delivering 1000W RMS at 2 ohms and 1 ohm (600W at 4 ohms), from the Hertz SPL Show range. Its ultra-compact, fanless IP55 aluminium chassis makes it suited to motorcycle, under-seat sports car and behind-seat truck installations.
Key specifications
- Channels: 1 (mono), Class D, 1 ohm stable
- Output power (RMS @ 14.4V): 600W at 4 ohms, 1000W at 2 ohms, 1000W at 1 ohm
- Efficiency: up to 87%
- Low-pass filter: 50 – 250 Hz @ 24 dB/octave
- Subsonic filter: 25 Hz @ 24 dB/octave
- Bass boost: 0 – 8 dB @ 45 Hz
- Inputs: Pre In and Speaker In with USS and ART
- Protection: IP55 aluminium chassis, no cooling fan
- Dimensions: 211.6 x 130 x 49 mm
- Weight: 2.15 kg
The SP 1.900 uses Hertz's ADC (Advanced D-Class) output stage to achieve up to 87% efficiency. Maximum power of 1000W is available at 2Ω and remains stable at 1Ω. At just 211.6 x 130 x 49 mm, it suits tight installations where space is limited.
Features
- ADC (Advanced D-Class) 1Ω stable output stage — up to 87% efficiency in a compact form factor.
- USS (Universal Speaker Simulators) allows the SP 1.900 to work with head units featuring speaker load detection circuits.
- IP55 aluminium chassis protects against humidity and external contaminants.
- Fanless design prevents internal dirt accumulation.
- Sealed power cord, line inputs and speaker outputs prevent oxidation.
- Crossover filters and controls on a single side for easier calibration once installed.
- Balanced, fully differential high-noise rejection inputs.
- ART (Automatic Remote Turn-On/Off) automatically turns the amplifier on and off with the OEM head unit — can be enabled or disabled.
- 24 dB continuously adjustable Lo-Pass subwoofer filter (50 – 250 Hz).
- Subsonic filter (24 dB – 25 Hz) removes very low subsonic frequencies to protect the subwoofer.
- Compatible with the optional HRC BM Remote Volume Control for dashboard-level subwoofer volume adjustment.
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Specification
| Channels | 1 |
|---|---|
| Nominal power supply voltage | 11 ÷ 15 VDC |
| Pulse Operating voltage | 6 ÷ 16 VDC |
| Idling current | 1.1 A |
| Idling current when off | 0.03 mA |
| Remote IN | 6 ÷ 15 VDC (9 mA) |
| Damping factor @ 1 kHz, 4Ω, 2 VRMS | >300 |
| Bandwidth @ -3 dB | 5 Hz ÷ 500 Hz |
| S/N ratio (A weighted @ 1 V Input) | 95 dBA |
| Pre-In sensitivity | 0.6 ÷ 6 VRMS |
| Speaker-In sensitivity | 2.2 ÷ 22 VRMS |
| Minimum load impedance | 1Ω |
| IP Rating | IP55 |
| Operating Temperature | Range 0°C (32°F) to 55°C (131°F) |
| Weight | (kg/lbs) 2.15 / 4.74 |
| Adjustable Crossovers | yes |
| 1 Ch | 600 W (4Ω) |
| 1 Ch | 1000 W (2Ω) |
| 1 Ch | 1000 W (1Ω) |
| Total Power | 1000 W |
| INPUTS | Pre IN / Speaker IN |
| Full | Yes |
| Lo-pass | 50 ÷ 250 Hz @ 24 dB/Oct. |
| Bass Boost 45Hz (adjustable) | (0 ÷ 8) dB |
| Phase (adjustable) | 0 ÷ 180° |
| Subsonic | 25 Hz @ 24 dB/Oct. |
| Remote Volume Control (not included) | -21 + 5 dB |
More specs
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What's Included
- SP 1.900
Hertz
About the Hertz SP 1.900
From our tech experts at CEN
A monoblock amplifier for subwoofer duty, rated at 1000w RMS. Everything it makes goes to the bass.
Who it suits
Anyone adding a subwoofer that needs real power behind it.
Our tech experts advise
Power figures mean little until the amplifier is matched to the speakers and the gains are set with a meter rather than by ear. It needs a fused feed from the battery on the correct cable gauge. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
Explore the full Hertz range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Hertz
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Frequently Asked Questions
Q: How do I choose the right amplifier for my speakers or subwoofer?
A: Match the amplifier's RMS output per channel to the RMS handling of your speakers or subwoofer at the same impedance. The Specification tab lists the power figures. If in doubt, contact CEN with your setup and we will recommend a match.
Q: What wiring do I need to install this amplifier?
A: You will need an amplifier wiring kit sized to the amplifier's power draw, typically including power and earth cable, a fuse, RCA leads and a remote wire. CEN stocks complete wiring kits, and the amplifier's fuse rating is the guide to the cable gauge required.
Q: What class of amplifier is this and does it matter?
A: Class D amplifiers are compact and efficient, ideal for subwoofers and modern installs. Class AB designs are traditionally favoured for outright sound quality on mid and high frequencies. The class is listed in the Specification tab where provided.
Q: Will an amplifier work with my factory head unit?
A: Yes, in most cases. If your head unit has no RCA outputs you will need a line output converter to feed the amplifier a clean signal. CEN stocks line output converters and can advise the right one for your vehicle.
Q: Can CEN install this amplifier?
A: Yes. CEN offers professional amplifier installation from our Nottingham premises, including secure mounting, wiring and setup. Contact us to book.
Q: Is the Hertz SP 1.900 1 ohm stable?
A: Yes. It delivers 1000W RMS at 2 ohms and remains stable at 1 ohm, still delivering 1000W RMS. At 4 ohms it produces 600W RMS.
Q: Is a remote level control included with the SP 1.900?
A: No. The HRC BM remote volume control is optional and sold separately. It lets you adjust the subwoofer level from the dashboard.
Q: Is the SP 1.900 suitable for motorcycles?
A: Yes. It has an IP55 aluminium chassis, no cooling fan to collect dirt, and sealed power, input and speaker cables to prevent oxidation, making it suitable for motorcycle installs.
