An Updated Legend - The Solid State Logic BUS+ Bus Compressor Whilst the core design of THE BUS+ remains faithful to the original, a number of advanced processing tools have been added to create the most versatile Bus Compressor ever. In addition to D-EQ and Transient Expander, THE BUS+ features three unique compression colors: LOW THD, F/B and 4K MODE. Each ‘color’ offers a different characteristic and can be combined for very unique compression styles. General 100% analogue circuit, controlled digitally using stepped front-panel pots Huge +27.5 dBu headroom Configurable processing order - Bus Compressor pre D-EQ (default) or post CH 1 IN and CH 2 IN buttons for global bypass Settable Operating Level - 0 dB (nominal), +10 dB, -5 dB Sleep and Auto-Sleep modes Precision MDAC-controlled MAKE-UP Gain with two ranges - 1 dB or 0.5 dB steps Bus Compressor Four modes of operation - Classic Stereo, Σ S/C Stereo, Dual Mono or Mid-Side External side-chain inputs and sends The authentic SSL Bus Compressor circuit LOW THD Mode reduces low-frequency distortion caused by compression F/B Mode alters the compression characteristics for a more 'relaxed' style of compression 4K Mode - single VCA operation with variable harmonic distortion to bring some 'grit' and 'grunge' to the mix Negative Ratios - for creative pumping effects and control of particularly loud signals New Attack and Release options, including the new 'Auto 2' setting MIX control for instant parallel compression Moving-coil gain reduction meters Unlockable Transient Expander D-EQ Powerful 2-band analogue Parallel Dynamic EQ - the D-EQ Compress/Expand modes Three choices of time constants for each band - Nominal, FAST or AUTO 16 selectable Frequency points per band Adjustable Range control per band from 0.5 dB to 15 dB HF band can be switched to Bell shape, with selectable frequencies covering High-Mids and Highs Frequency band static 'make-up' gain for LF and HF bands (Stereo/ Σ S/C Stereo) or LF band (Dual Mono/Mid-Side) G-Series mode changes LF filter to be 2nd order with degree of undershoot/overshoot Tri-color activity LEDs to indicate D-EQ activity Individually bypass-able bands SPECIFICATIONS General Power Supply: Auto-Ranging 100-240 VAC Operating Power: 38 Watts Sleep Power: < 1 Watt Auto-Sleep Power: 10 Watts Width: 480 mm / 19 inches Height: 88.9 mm / 3.5 inches (2 RU) Depth: 303 mm / 11.9 inches (chassis only), 328 mm / 12.9 inches (total including front panel controls) Weight: 5.92 kg / 13.1 lbs Boxed Dimensions: 550 mm x 470 mm x 225 mm (21.7 x 18.5 x 8.9 inches) Boxed Weight: 8.68 kg / 19.14 lbs Inputs Female: XLR x2 External Inputs: Female XLR x2 Outputs Male: XLR x2 External Sends Male: XLR x2 Audio Performance Input Impedance: 10 kΩ Output Impedance: 60 Ω Maximum Input and Output Level: +27.5 dBu operating Level Modes 0 dB/-5 dB, 1% THD Frequency Response: ±0.025 dB bypassed, 20 Hz to 20 kHz < 1 Hz bypassed, -3 dB low cut-off > 200 kHz bypassed, -3 dB high cut-off ±0.01 dB compressor in, 20 Hz to 20 kHz < 2 Hz compressor in, -3 dB low cut-off > 180 kHz compressor in, -3 dB high cut-off THD+N: -95 dB / 0.0017% typical bypassed, 1 kHz @ 0 dBu -106 dB / 0.0004% typical bypassed, 1 kHz @ +20 dBu -88 dB / 0.004% typical compressor in, 1 kHz @ 0 dBu Noise: -95 dBu typical bypassed -90 dBu typical compressor in -89 dBu typical 4K mode in (any intensity) Dynamic Range 122.5 dB bypassed 117.5 dB compressor in Crosstalk: < -118 dB bypassed, 20 Hz @ +24 dBu < -110 dB bypassed, 1 kHz @ +24 dBu < -90 dB bypassed, 10 kHz @ +24 dBu Make-Up Gain Precision: < 0.003 dB - 10 dB to + 20 dB Stereo Matching: < 0.05 dB bypassed < 0.02 dB in, 1 kHz @ 0 dBu < 0.1 dB sual Mono, any setting gain reduction 200 kHz LF in, -3 dB high cut-off ±0.05 dB HF in, 20 Hz to 20 kHz < 2 Hz HF in, -3 dB low cut-off > 200 kHz HF in, -3 dB high cut-off THD+N: -88 dB / 0.004% typical LF in, 40 Hz @ dBu -81 dB / 0.008% typical HF in, 10 kHz @ 0 dBu, 40 kHz BW Headroom: > 27 dB LF in, Hf in Noise: -90 dBu typical LF in -87 dBu typical HF in LF Gain Accuracy: ±0.05 dB typical LF in, 40 Hz @ 0 dBu: -10 dB to + 10 dB HF Gain Accuracy: ±0.05 dB typical HF in, 10 kHz @ 0 dBu: -10 dB to + 10 dB Stereo Matching: < 0.05 dB LF/HF in, 20 Hz to 20 kHz @ 0 dBu < 0.1 dB LF in, 40 Hz, any gain change < 0.1 dB HF in, 10 kHz, any gain change Manufacturer: Solid State LogicModel: THE BUS+SKU: I708589-N-0-WHXXUPC: 878076001517We are Chuck Levin's Washington Music CenterSince 1958, Chuck Levin’s Washington Music Center has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Music®—from instruments and recording gear to pro audio, rentals, and repair services.Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE line—exclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.Chuck Levin’s isn’t just a store—it’s a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.
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