Ruthless Audio 1500.1 Micro 1,500 Watt Monoblock Amplifier
Need subwoofer power without giving up a large section of your cargo area? The Ruthless Audio 1500.1 Micro 1,500-Watt Monoblock Amplifier is rated at 1,500W RMS at 1 ohm at 14.4V in a chassis only 12-13/16" long. Its compact dimensions make it worth considering for a space-limited daily-driver or custom bass build, provided you can supply the electrical power and ventilation it needs.
The published efficiency figures are 84% at 1 ohm, 89% at 2 ohms, and 93% at 4 ohms. Listed output at 14.4V is 1,500W RMS @ 1Ω, 1,050W RMS @ 2Ω, and 600W RMS @ 4Ω. The amplifier's 10Hz–250Hz frequency response, 0–180° phase control, and 0.2V–6V input sensitivity provide specifications to consider when integrating it with your source and subwoofer stage. Published THD is less than 0.01% at 4Ω; that figure applies to the specified test load, not every operating condition.
The chassis measures 12-13/16" long, including an 11-13/16" heatsink, by 4-11/16" wide and 2-1/4" high. A listed 150A fuse rating and 4 AWG power inputs make careful cable, fuse, and electrical planning important. Choose your subwoofer or subwoofers based on their combined RMS handling and calculated final load; the specified minimum impedance is 1Ω.
Why Choose the Ruthless Audio 1500.1 Micro Monoblock?
- 1,500W RMS @ 1 Ohm — Published output at 14.4V for a properly matched subwoofer setup.
- 84% / 89% / 93% Efficiency — Listed efficiency figures at 1Ω, 2Ω, and 4Ω respectively; actual system demands still depend on use.
- Compact Micro Chassis — A 12-13/16" overall length offers additional mounting options in space-conscious builds.
- Class-D Architecture — A compact amplifier design suited to a dedicated subwoofer channel.
- 10Hz–250Hz Frequency Response — Published low-frequency range for bass-focused use.
- 0–180° Phase Control — Adjustment that can help integrate the subwoofer stage with the rest of the system.
- THD < 0.01% @ 4Ω — Listed distortion specification at the stated load.
- 150A Fuse Rating / 4 AWG Inputs — Key details to use when planning power wiring and protection.
Subwoofer & Electrical Recommendations
Consider subwoofers with suitable combined RMS handling, excursion, and voice-coil configurations for the amplifier's output at your chosen load. The old listing suggested 750W RMS or higher drivers, but the right number and rating depend on the full system. Calculate final impedance from the exact voice coils and series/parallel connections; two dual-voice-coil subs do not automatically create a 1Ω or 2Ω final load. Keep the load at or above the listed 1Ω minimum. The original wiring guidance calls for a 4-gauge power and ground kit and a 150A inline fuse. Confirm cable sizing, fuse placement, and protection against the manufacturer's instructions and the actual run length.
A compact amplifier can still place significant demands on the charging system. Check alternator and battery capacity and monitor voltage under load, particularly at 1Ω. A Big 3 upgrade may be worth considering based on the vehicle and full audio system, but no single cable size or voltage target guarantees performance. If a ported subwoofer enclosure requires subsonic filtering, confirm whether your system has that control in an upstream DSP or crossover. Use phase adjustment as part of an actual listening or measurement-based tuning process.
Full Specifications
| Specification | Value |
|---|---|
| RMS Power @ 1Ω (14.4V) | 1,500W (84% efficient) |
| RMS Power @ 2Ω (14.4V) | 1,050W (89% efficient) |
| RMS Power @ 4Ω (14.4V) | 600W (93% efficient) |
| Amplifier Class | Class-D |
| Channels | 1 (Monoblock) |
| Frequency Response | 10Hz – 250Hz |
| Phase Control | 0° – 180° |
| THD | < 0.01% @ 4Ω |
| Input Sensitivity | 0.2V – 6V |
| Power Input Gauge | 4 AWG |
| Fuse Rating | 150A |
| Overall Length | 12-13/16" (12.8125") |
| Heatsink Length | 11-13/16" (11.8125") |
| Width | 4-11/16" (4.6875") |
| Height | 2-1/4" (2.25") |
| Impedance Stability | 1 Ohm Stable |
| Warranty | 1 Year Standard / 2 Year Extended Available |
Frequently Asked Questions
Q: What subwoofers pair best with the Ruthless Audio 1500.1 Micro?
A: Choose drivers whose combined RMS handling and final wired impedance suit the amp's 1Ω, 2Ω, or 4Ω rating. Check the specific voice-coil configuration and enclosure design before buying.
Q: What wiring kit do I need for the 1500.1 Micro?
A: The original listing calls for a 4-gauge power and ground kit with 150A fusing. Confirm the proper cable size and fuse location for the run and the manufacturer's instructions; assess whether your vehicle needs charging or Big 3 upgrades.
Q: How does the 1500.1 Micro compare to a full-size 1500W monoblock?
A: This model's published output is 1,500W RMS at 1Ω, and its chassis is 12-13/16" long. Compare dimensions, electrical needs, and verified ratings for any specific full-size alternative rather than assuming every larger amp performs the same way.
Q: Is the 1500.1 Micro 1-ohm stable?
A: Yes, the specifications list 1Ω as the minimum stable impedance and 1,500W RMS at that load at 14.4V. Check current warranty terms separately for coverage conditions.
