Description
The ARC Audio X2 450.4 is a compact four-channel Class-D amplifier designed to provide efficient full-range power in automotive and powersports systems. Its microprocessor-controlled architecture, high-frequency switching power supply, and balanced input stage are intended to maintain clean signal delivery while fitting into limited installation space.
The amplifier produces 85 watts per channel into 4 ohms or 125 watts per channel into 2 ohms. It can also be bridged to deliver 250 watts to each of two 4-ohm loads. Front and rear crossover sections, variable bass boost, speaker-level-compatible RCA inputs, and automatic turn-on functions allow it to work with aftermarket radios or many factory-audio sources.
The X2 450.4 uses an extruded aluminum heatsink, audiophile Class-D output filter networks, high-capacity low-ESR power-supply storage, nickel-plated RCA connections, quick-disconnect speaker terminals, and stored fault-code protection. Its single-side connection layout and rotatable logo support horizontal or vertical mounting.
Specifications
| Amplifier class | Class D |
|---|---|
| Channels | 4 |
| Power output at 4 ohms | 85 watts × 4 |
| Power output at 2 ohms | 125 watts × 4 |
| Bridged power at 4 ohms | 250 watts × 2 |
| 2-ohm bridged operation | Not recommended |
| Frequency response | 20 Hz–20 kHz |
| Front crossover range | 50 Hz–3 kHz |
| Rear high-pass range | 10 Hz–1 kHz |
| Rear low-pass range | 50 Hz–3 kHz |
| Crossover slope | 12 dB/octave |
| Bass boost | Variable 0–9 dB at 45 Hz |
| Remote level control | Optional accessory; not included |
| Input sensitivity | 200 mV–3.5 V |
| Maximum current draw | 125 A at 1,060 W/20% THD |
| Fuse rating | 2 × 25 A |
| Dimensions | 8.173 × 6.268 × 2.086 inches |
| Power supply | High-frequency switching design |
| Input stage | Fully balanced |
| RCA inputs | Nickel-plated; speaker-level compatible |
| Speaker connections | Quick-disconnect terminal plugs |
| Protection | Microprocessor-controlled with stored fault codes |
| Automatic turn-on | Signal-sense and DC-detect |
| Vehicle compatibility | Start/stop compatible |
| Mounting orientation | Horizontal or vertical |
Features
- Four-channel full-range Class-D amplifier.
- Bridgeable channel pairs for two-channel high-power operation.
- High-frequency switching power supply.
- Fully balanced input stage.
- Speaker-level-compatible RCA inputs.
- Signal-sense and DC-detect automatic turn-on.
- Front and rear crossover controls.
- Variable bass boost.
- Audiophile Class-D output filter networks.
- Ultra-low-ESR high-capacity power-supply storage capacitors.
- Microprocessor-controlled protection with stored fault codes.
- Nickel-plated RCA terminals.
- Quick-disconnect speaker terminal plugs.
- Single-side connection layout.
- Extruded aluminum heatsink chassis.
- Horizontal or vertical mounting with a rotatable center logo.