SP-300.4D - @1 ohm
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SUPER POWER AUDIODESIGNED IN ITALY
MMXXVI
4 × 300 W RMS.
One amplifier, the whole system.
Four channels, stable down to 1 ohm per channel: two front and two rear speakers driven properly, or two channels bridged onto a subwoofer while the other two keep the front stage. One amplifier instead of two, and one power run instead of two.
Power, measured not promised
RMS @ 14.4 V · CONTINUOUS POWER, NOT BURST · PER CHANNEL · MINIMUM LOAD 1 Ω PER CHANNEL
Why this amplifier
Two front and two rear speakers, driven with real RMS power. One power run, one ground, one remote: less wiring in the car and less to go wrong.
Bridge two channels onto a subwoofer — 2 × 600 W RMS at 2 ohm bridged — and keep the other two for the front speakers. A complete system with a single amplifier.
Each channel holds its rated power down to 1 ohm, so low-impedance pairs and demanding midbass loads are not a problem.
Output short circuit, high and low supply voltage and thermal protection, with a temperature-driven fan. It works between 9 V and 16 V.
The general SP Audio amplifier manual: wiring, loads and impedance, filters and gain calibration.
⇩ Download the manual (PDF)English · 2026
What you receive
The SP-300.4D @1 ohm is sold as a single unit, packed for transport. Plan the speaker loads first: four channels at 1, 2 or 4 ohm, or two of them bridged onto a subwoofer.
In the box: amplifier · mounting hardware.
Not included: power and speaker cable, inline fuse holder and RCA cable — installation materials, chosen for your vehicle and your system.
Technical specifications
| POWER PER CHANNEL — RMS @ 14.4 V | |
|---|---|
| 4 ohm | 4 × 100 W |
| 2 ohm | 4 × 150 W |
| 1 ohm | 4 × 300 W |
| Bridged, 2 ohm | 2 × 600 W |
| Minimum load | 1 ohm per channel |
| POWER SUPPLY & PROTECTION | |
| Minimum supply voltage | 9 V |
| Maximum supply voltage | 16 V |
| Protections | Output short circuit, high supply voltage, low supply voltage, thermal |
| Thermal management | Smart Cooling System, temperature-driven fan |
| FILTERS & INPUTS | |
| Topology | Class D, 4 channels |
| Frequency response | 10 Hz – 20 kHz (3 dB) |
| S/N ratio | 100 dB |
| Input sensitivity | 200 mV |
| Input impedance | 56 kΩ |
| High-pass filter (HPF) | 15 Hz – 6 kHz |
| Low-pass filter (LPF) | 50 Hz – 2 kHz |
| Bass boost | 0 – 12 dB (50 Hz) |
| Sold as | Unit |
MANUFACTURER’S LABORATORY DATA · PEAK OR “BURST” FIGURES USED IN SOME MARKETS ARE NOT RMS AND ARE NOT LISTED
Complete the system
Before you install it
- Inline main fuse within 20 cm of the battery, sized to the cable, and a ground point on bare metal. 4 AWG is the recommended cable for the battery run.
- Respect the minimum load: 1 ohm per channel. Bridged, do not go below 2 ohm. A lower impedance triggers the protection and, if repeated, damages the output stage.
- Set the filters before you set the gain. High-pass on the front and rear channels, low-pass on the bridged pair if it drives a subwoofer: it protects the speakers and cleans up the sound.
- 12 V systems only, negative ground, supply between 9 V and 16 V, with air around the amplifier for the fan. Professional installation is recommended: damage caused by improper installation is not covered by warranty.
Questions installers ask
spaudio@spaudio.it · +39 340 807 8778
Accepted payment methods
Visa · Mastercard · Maestro · American Express · PayPal · Apple Pay · Google Pay · Shop Pay · Klarna
SP Audio — Super Power Audio. Designed in Italy by Audiocar Import & Export SRLS, Milano, official SP Audio distributor for Europe.