KEF LS3/5a SignatureModel
¥ 75,000 (1 unit, around 1994?)
Commentary
Based on LS3/5a released in 1975, this signature model was developed under the supervision of Raymond Cook who designed LS3/5 and LS3/5a.
For the built-in unit, specifications are strictly controlled by a pair of left and right units, and only those that have passed the strict test of ± 0.5 dB or less error as a stereo pair are adopted. An 11 cm KEF B110C type SP1228 unit is used for the middle and low frequencies up to 3 kHz, and a T27SP1032 tweeter is used for the high frequencies.
In order to completely seal the inside of the enclosure and make it airtight, PVC sheet is used on the edge of the woofer, and the unit is decoupled and sealed.
The network section consists of 26 carefully selected high-quality parts. Each speaker is individually adjusted by computer simulation, and the characteristics of the entire system are strictly controlled within ± 0.25 db of the BBC specification.
The front baffle is made of felt material around the unit to eliminate interference caused by vibration of the cabinet.
The enclosure is made of 12-mm-thick birch material, which is well known as a piano material and has excellent strength. In addition, beech wood is used as a splint for the joint part to increase the internal strength.
In addition, the outer surface is finished with a teak board, making use of the natural wood grain.
As for the internal structure, the rear panel is fixed and an air-tight seal is applied from the cabinet body to the screw hole. In addition, high-mass polyurethane foam is applied to the back pressure from the speaker unit to eliminate internal resonance.
The speaker terminal has a wide opening for connection with banana chip terminals and other high-quality cables.
It also has a bi-wiring terminal for bi-amplifier drive.
A gold plate with Raymond Cook's signature is attached to the rear panel to indicate that it is a special version with direct supervision by the developers themselves.
Model Rating
| Method | 2-Way, 2-Speaker, Airtight Type, Bookshelf Type |
| Units Used | For Low Band : 11 cm Cone Type (B110C) For High Range : 1.9 cm Dome Type (T27) |
| Frequency characteristic | 70 Hz to 20 kHz ± 3 dB 59Hz -6dB |
| Impedance | 11 Ω |
| Output sound pressure level | 82.5dB/2.83Vrms/m (50 Hz to 20 kHz) |
| Maximum allowable input | 30W |
| Internal volume | 5.5L |
| External dimensions | Width 190x Height 304x Depth 162 mm |
| Weight | 5.0kg |