Velodyne DF-661 loudspeaker Specifications

Sidebar 1: Specifications

Description: Three-way, stand-mounted, reflex-loaded loudspeaker. Drive-units: 1" (25mm), ferrofluid-cooled metal-dome tweeter; 6" (152mm) spun-aluminum laminated–cone midrange unit; 6" (152mm) spun-aluminum cone woofer. Crossover frequencies: 700Hz, 5.5kHz. Electrical crossover slopes: 3rd-order low-pass to woofer, 18dB/octave; 2nd-order high-pass, 2nd-order low-pass, to midrange unit, 12dB/octave; 4th-order high-pass to tweeter, 24dB/octave. Frequency response: 60Hz–20kHz, +2dB. Sensitivity: 88dB/W/m (2.83V). Nominal impedance: 6 ohms. Distortion: !x0.1% at 1W (no frequency range specified). Amplifier requirements: 75–300W.
Dimensions: 18.875" (480mm) H by 8.5" (216mm) W by 10.5" (267mm) D. Internal volume: 700 cubic inches (woofer), 260 cubic inches (midrange). Weight: 40 lbs (18.2kg) each.
Serial numbers of units tested: 54069026A/B.
Finishes available: Designer Black, Piano Black, Rosewood, Natural Oak, Classic Walnut.
Price: $1800–$2600/pair, depending on finish (Rosewood finish costs $2400/pair), not including stands (1994); no longer available (2013). Approximate number of dealers: 440.
Manufacturer: Velodyne Acoustics, Inc., 1070 Commercial Street, Suite 101, San Jose, CA 95112. Tel: (408) 436-7270. Fax: (408) 436-7276. Web:

Velodyne Acoustics, Inc.
1070 Commercial Street, Suite 101
San Jose, CA 95112
(408) 436-7270