Description
Redback A4861 200W Subwoofer Amplifier
Compact Dedicated Subwoofer Amplifier with Adjustable Crossover and Phase Control
The Redback A4861 is a compact dedicated subwoofer amplifier designed to add proper low-frequency reinforcement to commercial and installed audio systems. It delivers 200W RMS into 4 ohms and is designed to work with passive subwoofers, including Redback’s own matching models, while remaining flexible enough for other compatible passive subwoofer applications.
This is a practical installation-focused amplifier aimed at retail music systems, commercial spaces and distributed audio setups where you want proper bass support without moving into a full separate hi-fi subwoofer electronics stack.
200W Into 4 Ohms
Proper low-frequency power for passive subwoofers
The A4861 provides 200W RMS at 4 ohms, giving it enough output to drive a passive subwoofer in commercial background music and installed audio systems. Redback positions it as a compact high-power subwoofer amplifier that can be paired with ceiling or floorstanding passive subwoofers.
- Retail music systems
- Fitness and gym audio systems
- Hospitality and boutique commercial audio
- Installed 2.1 or full-range background music systems
Adjustable Crossover and Phase Control
Useful setup tools on the front panel
One of the most useful parts of the A4861 is that it includes front-panel adjustment for level, phase and low-pass crossover frequency. Redback specifies an adjustable crossover range of 35Hz to 160Hz and a phase range of 0 to 180 degrees.
That matters in the real world because subwoofer integration is rarely “plug it in and magically perfect.” These controls let you better match the subwoofer to the main speakers and the room.
Line-Level and Speaker-Level Connectivity
Easy to integrate into installed systems
The A4861 includes stereo RCA input plus speaker-level input and output, making it relatively easy to insert into a wider range of systems. Redback also notes that the speaker-level output passes through full-band speaker-level audio from the connected amplifier, which helps when building simple 2.1-style systems.
- Pairing with small stereo amps
- Adding bass reinforcement to installed systems
- Commercial distributed audio applications
- Simple subwoofer integration without a dedicated AV receiver
Compact Install-Friendly Format
Small enough to tuck away
The A4861 is built in a compact tabletop-style chassis, with listed dimensions around 200mm wide, 160mm deep and 47.5mm high. That helps when space is tight or when the amplifier needs to be hidden in cabinetry, behind counters or in equipment areas.
Specifications
| Specification | Details |
|---|---|
| Product Type | Subwoofer amplifier |
| Power Output | 200W RMS into 4 ohms |
| Inputs | Stereo RCA, speaker-level input |
| Outputs | Speaker-level output |
| Adjustable Low Pass Crossover | 35Hz – 160Hz |
| Phase Range | 0 – 180° |
| THD | <1% at rated power |
| Line Input Sensitivity | 200mV |
| Trigger In | 12VDC |
| AC Input | 115V / 230V |
| Dimensions | 200 x 160 x 47.5 mm |
| Weight | 1.32 kg |
Detailed Technical Specifications
For those who like to see exactly how it’s built and how it works
View full technical specifications
Amplifier Section
- Dedicated subwoofer amplifier
- 200W RMS into 4 ohms
- THD: less than 1% at rated power
Control and Adjustment
- Front-panel volume level control
- Adjustable low-pass crossover from 35Hz to 160Hz
- Adjustable phase from 0 to 180 degrees
Connectivity
- Stereo RCA input
- Speaker-level input
- Speaker-level output pass-through
- 12V trigger input
Protection and Operation
- Thermal protection
- Auto turn-on sensitivity: 2mV at 50Hz
- 115V / 230V AC input operation
Physical Details
- Compact tabletop design
- Dimensions: 200 x 160 x 47.5 mm
- Weight: 1.32 kg
Typical Pairing
- Ideally paired with Redback A4860 and C1065 according to Redback
- Also suitable for other compatible passive subwoofers
The Audio Experts Take
The A4861 is a straightforward install-focused subwoofer amplifier. The useful bit here is not just the 200 watts, it is the fact that Redback gives you the controls that actually matter for integration: level, phase and crossover. That makes it much easier to get a passive subwoofer working properly in a commercial or distributed system.
For retail, hospitality or background music systems that need more weight down low, this is a practical little problem-solver.
📦 Brand new
🛡 Full Australian warranty
📍 Available in store and online at The Audio Experts
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.