Adastra RM4460 Zoning 100 V Mixer‑Amp - 4×60 W
Overview
The Adastra RM4460 is a 1U rack‑mountable mixer‑amplifier designed for professional installations in environments such as hospitality venues, offices, retail units, and public buildings. Offering four independent 60 W zones with 100 V or 4 Ω outputs, this unit is ideal for background music, paging systems, or multi-zone audio applications. Integrated with USB playback, FM tuner, and Bluetooth 5.0, it reduces the need for external sources while delivering reliable and flexible performance.
Design and Build Quality
Housed in a compact yet durable 1U steel chassis, the RM4460 includes rack ears for convenient 19″ rack mounting. The design is both functional and resilient, incorporating essential thermal and electrical protections for dependable long-term use. Balanced XLR/combo mic inputs, RCA, AUX, screw terminal outputs, and digital playback inputs offer comprehensive connectivity. The internal toroidal transformer enhances noise isolation and consistent performance.
Key Technologies and Features
- Class‑D Amplification: Efficient and cool-running technology, optimised for continuous use across all four zones.
- Integrated Media Sources: Built-in USB player, FM tuner, and Bluetooth 5.0 receiver simplify system design and use.
- Independent Zone Control: Each zone features independent volume and EQ (bass and treble) adjustments for tailored acoustic output.
- Phantom Power & Mic Priority: Inputs 1-3 support +20 V phantom power and VOX activation with priority override, ideal for paging.
- Emergency Mute: A 24 V contact input mutes zones 2-4 while preserving mic input for emergency announcements.
Specifications
| Specification | Details |
|---|
| Power Source | 100-240 VAC, 50/60 Hz (IEC) |
| Amplifier Type | Class‑D, 4×60 W RMS @100 V or 4 Ω |
| USB/Bluetooth/FM | Yes |
| Phantom Power | +20 V switchable on inputs 1-3 |
| EQ | Bass 100 Hz ±10 dB, Treble 10 kHz ±10 dB |
| Outputs | 4×100 V or 4 Ω screw terminals, 4×RCA line output |
| Dimensions | 482 × 283 × 43 mm |
| Weight | 6.85 kg |
| Protection | Short‑circuit, overload, overheat, fuse (5 A) |
Performance and User Experience
The RM4460 is engineered for real-world use, delivering consistent, clean power across all zones. The internal media sources ensure fast deployment without the need for external devices. The robust design and intelligent protections make it a reliable choice for commercial-grade installations.
Q&A Section
- Can I use this with 4 Ω or 8 Ω speakers? Yes, each output channel supports either 100 V line or low impedance (4 Ω/8 Ω) operation.
- Does it support streaming from mobile devices? Yes, Bluetooth 5.0 allows wireless audio playback from smartphones, tablets, and laptops.
- How does emergency muting work? When triggered by a 24 V contact closure, zones 2-4 are muted while the paging mic remains active.
- Is phantom power always on? No, phantom power is user-switchable on inputs 1-3 via rear panel DIP switches.
- Can it be rack-mounted? Yes, it comes with detachable rack ears for standard 19″ rack mounting.
- Is the FM tuner functional without an external antenna? Yes, but reception significantly improves with an external FM aerial connected.
- Does the unit require frequent maintenance? Minimal maintenance--ensure good airflow, dust periodically, and inspect the fuse annually if needed.
