Rockville RBG18S 18" Powered PA Subwoofer – good, 500W RMS, DSP, built-in crossover
The RBG18S is a straightforward, purpose-built powered PA subwoofer aimed at working DJs, live sound operators, and venues that need reliable low end without a complicated setup. The 18" driver sits in a 7-layer birch plywood enclosure with a 120oz magnet and a 4" four-layer voice coil, powered by a 500W RMS amplifier with thermal and clip protection built in. The onboard DSP gives you a choice between extended boost and low frequency enhancement modes, and the three-position low-pass crossover at 80, 100, or 120Hz lets you dial in the handoff to your mains without external processing. Connectivity covers balanced XLR and TRS combo inputs, XLR thru for chaining, RCA input, a polarity switch for time alignment, and a pole socket on top for mounting a full-range cabinet. The built-in casters and carry handles make load-in practical for a single operator.
This one is in good condition and fully functional. The carpet covering has a small area of lifting along the bottom rear edge — purely cosmetic and common on carpet-covered cabs that have seen regular use. Everything else is clean and solid. Please check the photos for a close look at the carpet condition.
- Make: Rockville
- Model: RBG18S
- Type: 18" active powered PA subwoofer
- Power: 500W RMS / 1000W program / 2000W peak
- Driver: 18" woofer, 120oz magnet, 4" four-layer voice coil
- Enclosure: 7-layer birch plywood, black carpet covering, metal corners
- Frequency response: 29Hz to 150Hz (+/-3dB)
- Maximum SPL: 125dB peak / 120dB continuous
- DSP: built-in, boost or extended low frequency modes; clip limiter with LED
- Crossover: 3-position low-pass, 80 / 100 / 120Hz
- Inputs: balanced XLR + TRS combo, RCA
- Outputs: balanced XLR thru for parallel connection
- Additional controls: polarity switch, variable input level
- Pole socket: yes, top-mounted
- Casters: yes, built-in
- Cosmetic condition: good — small area of carpet lifting on bottom rear edge, purely cosmetic
- Modifications: none
- Includes: power cable
Ships carefully packed and insured for full value.
International buyers are welcome — please contact us for a shipping quote before purchasing.
Heavy or oversized items may ship freight — we will confirm method and cost before proceeding.
About Mill River Music
Mill River Music is an independent, human-powered music shop located in downtown Northampton, MA, run by a team of players, enthusiasts, and certified repair technicians. Every piece of used gear we sell is personally inspected, tested, and set up before it ships — we don't list it until we'd be happy to play it ourselves.
As Martin and Taylor certified techs, we hold our guitar work to a high standard, and we're committed to full transparency about the condition of everything we sell. No surprises.
When you buy from Mill River, you're supporting an independent local business that genuinely cares — about gear, about players, and about doing things right. We're here every step of the way. Reach out anytime.
