BBC LS3/5a loudspeaker BBC LS3/5a Specifications

Sidebar 3: BBC LS3/5a Specifications

Description: Two-way, sealed-box, stand-mounted loudspeaker. Drive-units: 0.75" (25mm) Mylar-dome tweeter, 4.5" (110mm) Bextrene-cone woofer. Crossover frequency: 3kHz. Crossover slopes: not specified. Frequency response: 80Hz-20kHz ±3dB at 1m with grilles on. Sensitivity: 82dB/W/m. Nominal impedance: 16 ohms (1977-1984); 10 ohms (1989 onward). Amplifier requirements: 50W maximum.
Dimensions: 12" H by 7.5" W by 6.25" D. Enclosure volume: 5 liters. Weight: 11.7 lbs each.
Serial numbers of review samples: S0429 & #S0430 (1976 pair), none noted (1984, 1989), H1650A/B (1993), LE88105A and B (2007).
Price: $430/pair (1977), $450/pair (1984), $650/pair (1989), $999/pair (1993), $1295/pair (1996), $1695/pair (2007). Approximate number of dealers: 60 (1993).
Manufacturers: Rogers Loudspeakers Ltd., Mitcham, Surrey, England (1977, 1989); Spendor loudspeakers, Redhill, Surry, England (1984); Harbeth Acoustics, Haywards Heath, West Sussex, England (1993). KEF, Maidstone, Kent, England (1996). Stirling Broadcast, Somerset, England. Web: (2007).
US distributor: Reference Monitor International, Inc., 4901 Morena Blvd., Suite 309, San Diego, CA 92117, test samples loaned by Perfectionist Audio Ltd. & Associates, P.O. Box 174, Pleasant Gap, PA 16823. (1977); RCS Audio International, 1055 Thomas Jefferson St. NW, Washington, DC 20007 (1984); Audio Influx, P.O. Box 381, Highland Lakes, NJ 07422-0381 (1989); Golden String, 17825 NE 65th Street, A110, Redmond, WA 98052 (1993). Acoustic Sounds, PO Box 1905, 1500 S. Ninth Street, Salina, KS 67402-1905. Tel: (785) 825-8609. Fax: (785) 825-0156. Web: (2007).

edgrr's picture

Is it worth trying to use my amazing old 15 ohm monitors with a new Panasonic SC-PMX70 (3 ohm) or should I just stick to the speakers provided?
I moved to Peru and will hold off on buying a "proper" audio setup til I go back to the First World...

David Rapalyea's picture

Someone should to put these components into a bigger box with a passive radiator and recreate the KEF 104.

I have both the 104 and the 104ab. I prefer the 104 on my solid state Marantz 1060 and the single ended Reisong A10 on the 104ab.