37Hz LF Limit, High Power handling, High Efficiency
Low distortion, Low thermal compression
Laminar vents
Integrated locking feet
Designed with Cardioid Sub Arrays in mind


The SB115i is a high efficiency, high impact sub-bass loudspeaker with exceptionally high power handling. It provides high impact, high sensitivity, low thermal compression and incredibly low distortion, even at the highest drive levels. These combined properties deliver the sonic qualities of precision and musicality.

The SB115i is one of the recommended subwoofers for use with the C coaxial series and is also well suited for use with the VC system family from RMS-Acoustics. The SB115i can be deployed in standard or cardioid configurations, with dedicated presets for each configuration, in flown, or stacked configurations.

The SB115i features one long excursion, high power handling 15” cone loudspeaker mounted in a mechanically and acoustically optimized bass reflex cabinet with laminar venting. Port turbulence is virtually eliminated, and high drive level distortion is minimized via large, flared, symmetrical laminar venting. It operates from 40 Hz to 100 Hz when flown and from 37 Hz to 90 Hz when used as a general ground support subwoofer.

The SB115i enclosure was designed with installation in mind. It features 16 integrated fly points and optional array frames that allow for mounting to ceilings and the creation of traditional and cardioid flown arrays. The compact profile allows the SB115i to fit easily under stages, up tight to ceilings, and between standard framing for flush mount installations.

The enclosure is constructed of premium birch hardwood plywood to ensure maximum acoustical and mechanical integrity. It is then coated with a weather and wear resistant textured urethane hybrid finish. Components in the front of the enclosure are protected by a steel grill made from perforated steel and lined with acoustically transparent foam. All grill and rigging components are weather and corrosion protected with a heat cured epoxy powder coated finish or zinc plating with passivation.

The optimum processed loudspeaker solution for the RMS-Acoustics SB subwoofer family are the RMS-ACOUSTICS series of processed amplifiers, also the Linea Research C and M series amplifiers, with proprietary presets provided by RMS-ACOUSTICS.


System Sensitivity (1w, 1m)^1 98dB (2.9V @ 100Hz, 1W 1m)
Frequency Response (-10dB) 37Hz - 150Hz 0dB taken at 60Hz, processed
Frequency Response (±3dB) 40Hz - 90Hz 0dB taken at 60Hz, processed
Maximum SPL Continuous (1m)^2 129dB
Maximum SPL Peak (1m) 135dB
Long Term Power Rating (IEC)^3 LF 1100W Continuous, 2200W Program, 4400W Peak 100Hr
Long Term Power Rating (AES)^4 LF 1500W (3000W Peak) 2 hr
Maximum Input Voltage LF 110 V RMS (2 hrs), 155V Peak
Nominal Coverage Pattern Omni directional, variable directivity with cardioid presets and custom modification
System Crossover Proprietary DSP via RMS-ACOUSTICS and Linea Research processing platform
Transducer Specifications SPKR-15-0007 LF Driver - 15” low frequency cone loudspeaker with 4” voice coil, shorting ring and high performance convective cooling technology
Impedance LF 8 Ohm, Optional 4 Ohm
Input Connectors Dual Neutrik NL4MP Connectors
Enclosure Materials 15mm Birch Hardwood Ply 1.3mm layers
Grill Materials Cold Rolled Steel, Epoxy powder coat, Acoustically transparent black foam backing
Finishes Black finish (Standard) Polyurethane textured spray
Additional Finishes available - See Options Below
Suspension and Mounting Proprietary internal, captive rigging
Flown Array Maximum Maximum Array height dependent or rigging system employed. Standard and Cardiod flown arrays possible. Contact support at [email protected] to discuss further.
Rigging Hardware
Dimensions 22.52” W x 24” D x  17.18 H (572 mm x 584 mm x  467 mm) ,  16.88” H ( 429 mm) with rubber feet removed
Weight 80 Lbs (36.4 kg) Net   Shipping weight 91Lb (41.4 kg)
Finish Options -X (Weatherized), -W (White), -C (Custom Color) Upcharge applies
Optional Accessories
Free field, semi anechoic conditions.  To compare with half space measurements, add 6dB to maximum output specifications.
1. Full Space, 4pi conditions
2. Measured Maximum SPL, based on power compression observation of 3dB
3. IEC Shaped pink noise with 6dB Crest Factor
4. AES Standard AES2-2012, one decade pink noise with 6dB Crest factor within device’s applicable operating band, free air. Standard AES 2 hr rating are specific for low frequency transducers.