dbx 3BX 3-Band Dynamic Range Expander ā Used
Bring life, punch, and authentic clarity back to compressed vinyl records, cassette tapes, or modern digital audio with the legendary dbx 3BX 3-Band Dynamic Range Expander. Unlike single-band expanders that cause distracting audio "breathing" or "pumping," the vintage 3BX splits your signal into three discrete frequency bands (Low, Mid, and High) and processes each independently. The result is punchy transient response, deeper low end, crystal-clear highs, and up to 50% dynamic range expansion without altering natural tonal balance.
Condition is Good overall. The unit shows honest vintage wear and age, including light surface rust on the outer chassis enclosure and typical mounting wear around the rack ears and faceplate edges. Otherwise, it remains fully functional with clean signal output across both channels.
Housed in a substantial 2U chassis with classic horizontal faders and multi-band LED metering, the dbx 3BX remains one of the most sought-after analog audio restoration tools for audiophile hi-fi setups and studio outboard racks alike. Our technicians have bench-tested the unit and verified all sliders, buttons, LED meter segments, and signal paths for proper operation.
Specifications
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Model: dbx 3BX 3-Band Dynamic Range Expander
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Finish: Black Faceplate with Silver/Gold Trim & Chassis
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Condition: Good
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Form Factor: 19ā Standard Rackmount (2U Height)
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Expansion Ratio: Continuously variable from 1.0 to 1.5 (0% to 50% expansion)
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Dynamic Range: Up to 110 dB
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Frequency Response: 20Hz ā 20kHz (Ā±0.5dB)
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THD: Less than 0.1% at maximum expansion
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Inputs/Outputs: RCA Stereo Line In/Out, Pre/Post Tape Monitor Loop
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Controls: Expansion Level, Transition Level, Source/Tape Selector, Post/Pre Selector, Bypass Switch
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Power Requirements: 120V AC, 50/60Hz
Condition Notes
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Good overall vintage cosmetic condition
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Shows surface rusting on chassis/casing and age-appropriate rack wear
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Faceplate and meters present well
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100% fully functional signal path and processing
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All horizontal faders and pushbutton controls move smoothly
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LED meter segments illuminate and track gain changes properly
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Bench-tested and ready for integration into your setup
Professionally Inspected & Ready to Play
Every piece of pre-owned gear at BCR Music & Sound receives a thorough inspection before it reaches our showroom or website. We verify signal integrity, control operation, metering, hardware, and overall functionality. This ensures your outboard gear arrives ready to integrate seamlessly into your rig right out of the box.
Secure Packing & Shipping
We take shipping seriously. Every item is carefully protected using professional packing materials, double-boxed when necessary, and fully insured for transit. Whether you're across Pennsylvania or across the country, you can buy with confidence knowing your gear has been prepared to arrive safely and exactly as described.