Description
The Ruthless Audio 1500.4 is the high-output 4-channel amp for systems that need real power across the entire front stage. With 450W × 4 at 2 ohms and 900W × 2 bridged at 4 ohms, it has the muscle for pro-audio mids, demanding component sets, or flexible bridged configurations while keeping the control and crossover range a serious full-range build needs.
WHY CHOOSE THE RUTHLESS AUDIO 1500.4?
- 450W × 4 @ 2Ω (14.4V) — serious per-channel output for high-power speakers.
- 250W × 4 @ 4Ω — plenty of clean headroom for traditional component systems.
- 900W × 2 Bridged @ 4Ω — bridge channels in pairs for high-power 2-channel applications.
- 1-Year 2Ω Warranty Coverage — standard manufacturer defect coverage includes operation down to 2 ohms per channel when warranty conditions are met.
- Clip Light Function — visual clipping feedback helps with gain setup and system protection.
- Wide-Range Crossovers — HPF and LPF controls with x10 multiplier give you far more tuning range than a basic 4-channel amp.
- Tiffany-Style RCA Inputs — secure signal connections for high-output installs.
- 1/0 AWG Power Inputs / 200A Fuse — hardware sized for the amplifier’s real current demand.
FULL SPECIFICATIONS
| RMS Power @ 4Ω (14.4V) | 250W × 4 |
| RMS Power @ 2Ω (14.4V) | 450W × 4 |
| Bridged Power @ 4Ω (14.4V) | 900W × 2 |
| Standard Warranty Load | Down to 2Ω per channel when warranty conditions are met |
| Amplifier Class | Class-D |
| Channels | 4 (bridgeable to 2) |
| Operating Voltage | 8–16V |
| Input Sensitivity | 0.2V–6V |
| High-Pass Filter | 20Hz–800Hz / 200Hz–8kHz with x10 |
| Low-Pass Filter | 50Hz–800Hz / 500Hz–8kHz with x10 |
| THD | <0.01% @ 4Ω |
| RCA Inputs | Tiffany-style |
| Power Inputs | 1/0 AWG |
| Fuse Rating | 200A |
| Clip Light | Yes |
AMPLIFIER & WIRING RECOMMENDATIONS
The 1500.4 should be fed with quality 1/0 AWG OFC power and ground wiring and properly fused for the installation. Keep grounds short and low-resistance, route signal cables away from high-current power wiring, and make sure the charging system can maintain stable voltage when all channels are being pushed.
Bridged operation requires a minimum 4-ohm load. Do not wire a bridged pair below that load. Standard warranty coverage is down to 2 ohms per channel in stereo operation when all warranty requirements are met.
Operation below 11V is not covered under warranty. Set gains conservatively, use the clip indicator as a warning tool, and avoid sustained clipping.
FREQUENTLY ASKED QUESTIONS
Is the 1500.4 warrantied at 2 ohms per channel?
Yes. The standard 1-year manufacturer defect warranty covers operation down to 2 ohms per channel when Ruthless installation and operating requirements are met.
Can I bridge the 1500.4?
Yes. It is rated for 900W × 2 bridged at a 4-ohm load. Do not wire a bridged channel pair below 4 ohms.
What is the biggest difference between the 1500.4 and 800.4?
Output and current capacity. The 1500.4 delivers 450W × 4 at 2 ohms compared with 220W × 4 from the 800.4, and it steps up to 1/0 AWG power inputs and 200A fusing.
What does the clip light do?
It provides a visual warning when the output signal is clipping. Use it to help establish safe gain structure, then leave additional headroom for music dynamics and electrical voltage changes.
What can void warranty coverage?
Warranty does not cover vibration damage, wire or debris inside the amplifier, wiring below the covered impedance, external RCA damage, excessive clipping, or operation below 11V. Full warranty terms apply.
EXTENDED WARRANTY
No – Standard Warranty (1 Year)
Includes the standard 1-year manufacturer defect warranty, including covered operation down to 2 ohms per channel when all warranty requirements are met.
Yes – Extended Warranty (2 Years Total)
Adds 1 additional year of manufacturer defect warranty coverage for 2 years total.
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