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Specifications
Channels: 2
Input sensitivity: 6.5V (max)
Output level: 6.5V (max)
Noise reduction system: dbx II
S/N improvement: 40dB (dbx II)
Dynamic range: 105dB
Frequency response: 30Hz to 20kHz
Total harmonic distortion: 0.5%
Dimensions: 483 x 50 x 222mm
Weight: 2.7kg
Repair:
Unit Works Properly
At US$459, this DBX 224X-DS is a bargain compared to the typical used market, where similar units in good condition often list between US$600 and US$850. Most listings for this specific Type II noise reduction system sit near the US$700 median, making this asking price well below the 25th percentile and a genuine deal for a vintage tape enthusiast.
The 224X-DS remains well-regarded for its ability to eliminate tape hiss while boosting dynamic range by up to 40dB, letting you record louder and softer sounds with clarity. As a standalone unit that works with any deck, it offers meaningful upside for collectors seeking high-fidelity analog performance without modern digital processing. Since the condition is listed as unknown but the price is so low, it represents a strong buying opportunity for anyone willing to inspect or service a classic DBX processor.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Founded in 1971 in the United States by audio engineer David Blackmer, dbx emerged from his pioneering work in dynamic range processing. Blackmer, whose initials inspired the brand name, initially developed decibel expansion technology to enhance audio fidelity, aiming to capture the realism of live performances. The company's early innovations, including the dbx 202 "Boom Box" bass amplifier and the iconic dbx 160 compressor/limiter, quickly established it as a staple in professional studios and live racks during the 1970s and 1980s.
dbx specializes in professional audio signal processing equipment, with a legacy built on compressors, limiters, and noise reduction systems. Its lineup has expanded to include microphone preamps like the 286s, speaker management systems such as the DriveRack PA2, and modern rackmount processors in the CX and 500 Series. While it briefly ventured into consumer gear like speakers and amplifiers under BSR ownership in the late 1970s, dbx has steadfastly focused on pro-audio tools leveraging proprietary technologies like True RMS detection.
Now a division of Harman International (under Samsung), dbx holds a respected mid-tier position in the professional audio market, prized by engineers for reliable, workhorse dynamics control in broadcasting, live sound, and recording. Vintage models remain collector favorites, but current offerings compete effectively against digital rivals, blending heritage innovation with robust build quality for demanding applications.
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