GRAHAM AUDIO CHARTWELL LS3/5 BOOKSHELF SPEAKER
The LS3/5A is perhaps the best-known of all the BBC’s monitor designs. The BBC needed a small monitor that was suitable for critical assessment of programme quality in cramped OB vehicles and control rooms, and nothing suitable was available commercially. At the same time, a separate research project – an investigation into acoustic scaling of studios – had developed a miniature loudspeaker, and it was realised that it could be adapted for monitoring use. After much developement, the original LS3/5 was born.
Initially, 20 units were built in-house for field trials, but upon deciding to build another batch, it became apparent that KEF had altered both of the drive units, and the new units were sufficiently different to the originals to affect the way the loudspeaker measured and sounded. As a result, significant re-engineering work had to be completed by the BBC’s Designs Department, and this was such a significant deviation from the original model that the A suffix was added.
|System||2 Way, sealed enclosure|
|Enclosure||Thin wall construction, 9mm birch plywood, removable rear panel|
|Finish||Real wood veneer|
|Dimensions (w/h/d)||19cm by 30cm by 17cm|
|Frequency response||70Hz to 20kHz, ±3dB|
|Sensitivity||83dB SPL (2.83V, 1m)|
|Maximum output||95dB for a pair at 2m|
|Tweeter||19mm dome tweeter|
|Recommended amplifier power||25 to 50 watts unclipped programme|