While M Audio's Studiophile BX8 and BX5 offer as much or more bass response as you'll find in any monitors of similar size, the addition of an SBX subwoofer puts 120 watts of truly bone-shaking bass in your face. In fact, so many consumers have subwoofers that you're not really mixing accurately without having a sub yourself. M-Audio's unique Stereo Bass Management System splits the signal at the variable crossover frequency, routing everything below to the sub and everything above to the mains. The SBX is so affordable that it also makes an excellent companion to other monitors as well.
Features
8 in. Polypropylene driver
120 Watts of dedicated internal power
Custom Bass Reflex Cabinet design
Built in stereo bass management system
2 x XLR balanced Outputs for Satellites
2 x XLR Balanced Inputs
2 x TRS Balanced/Unbalanced Inputs
Controls for level, phase, sub frequency and satellite frequency
Crossover frequency adjustable from 50Hz to 180Hz
Auto on/off switch for standby mode
What's Stereo Bass Management
When subwoofers are added to many systems, all frequencies are routed to both the main monitors and the sub. The sub typically has a low-pass filter to roll off the highs - as does the SBX. The problem is that both the main monitors and the sub are still trying to put out the same low frequencies, thereby compromising fidelity. M Audio's Stereo Bass Management System solves that and delivers optimal quality. The SBX accommodates the stereo outputs from your mixer, and your main monitors then connect to outputs on the sub. The SBX's internal crossover network splits the signal at a user-defined crossover frequency (50-180Hz), routing everything below it to the internal sub and everything above it the main outputs. This significantly improves fidelity because the sub and mains aren't tripping over each other to reproduce the same frequency - and each component only has to reproduce frequencies to which it is ideally suited.
Technical Info
Specifications
Type: Bass-reflex powered subwoofer
Woofer Driver: 8-inch mineral-filled polypropylene cone with high-temperature voice coil and damped rubber surround
Frequency Response: 30Hz - 180 Hz
Crossover Frequency: Adjustable 50Hz - 180Hz
Input Sensitivity: 89dB
Amplifier Power: 100W @100Hz, 4 ohm, 0.1% THD
Dynamic Power: 120W
S/N Ratio: > 100dB below full output, 100Hz
Input Connectors: Two XLR balanced inputs; two 1/4 in. TRS balanced/ unbalanced inputs
Output Connectors: Two XLR balanced outputs for satellites, one XLR balanced output for additional subwoofer
Controls: Level; Phase; Subwoofer Frequency; Satellite Frequency
Switches: Auto on/off; Satellite high-pass output bypass
Input Impedance: 20k ohms balanced, 10k ohms unbalanced
Input Sensitivity: 150mV input produces full output with volume control at maximum
Protection: Over temperature, turn-on/off transient, subsonic filter, external mains fuse, ALC (avoid from hard clipping)
Indicator: Power On/ Stand-by (red) or Protection (Amber)
Power Requirements: Factory programmed for 115V ~50/60Hz; powered via detachable 3-circuit line cord
Cabinet: Vinyl-laminated MDF
Dimensions (H x W x D): 15.6 x 10.63 x 12 in.
Shipping Weight: 36 lbs. 
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