Models 304 and 303 were the export versions of the Concord III and Celeste III, the only difference being the use of the SP1074 T33 tweeter in place of SP1068.

 

The 303 and 304 were distinctive for their industrial design, the all-round black grille cloth and matching ULS 1 and 2 single pedestal stands allowing them to stand out from the conventional square wooden boxes of the time.

 

304 was one of the first ‘two and a half way’ designs – two 8” bass drivers being operated vertically in line at low frequencies. This arrangement improves power handling and reduces distortion at low frequencies. The response of the lower unit is progressively reduced as the frequency rises so that only the upper unit is radiating in the crossover region. By this means it is possible to retain the advantage of twin drivers at the low end of the range without the phase interference effects usually associated with multiple drive units. 

 

303 was an 8” two way closed box design with newly developed drivers and a sophisticated crossover network. Both models were designed for use with music centres and amplifiers with as little power as 10 watts per channel and benefited from KEF’s total design concept and digital evaluation techniques.

 

The B200 bass drivers for the 303 and 304 featured a new three-sided chassis specifically designed to be mechanically isolated from the cabinet. They were also the first KEF bass drivers to use a paper diaphragm – which by this time were being manufactured with good consistency - and the lower moving mass contributed to the high sensitivity target for these systems.

 

Specification: 304
System type: 2½-way, stand-mount
Enclosure type: Closed box
Size: 680 x 280 x 315cm (26.75x 11 x 12.4 inches)
Weight: 14kg (31 lb)
Input Impedance: 8 ohms
Rated maximum power: 100W programme
Amplifier Requirements: 10-100 watts per channel into 8 ohms
System resonance: 68Hz, Q=0.8
Frequency response: 60-20,000Hz +/-3dB
Sensitivity: 87dB spl at 1m for pink noise input of 1W
Maximum output: 107dB spl on programme peaks under typical listening conditions
Finishes:  Satin black plinth
Grille: Black fabric
System: SP1127
Drive units: 2 x B200 bass unit (SP1069), T33 tweeter (SP1074)
Crossover: SP1137

 

Specification: 303
System type: Two way, stand-mount
Enclosure type: Closed box
Size: 508 x 265 x 230 mm (20x 10.5 x 9 inches)
Weight: 8.1kg (18 lb)
Input Impedance: 8 ohms
Rated maximum power: 50W programme
Amplifier Requirements: 10-50 watts per channel into 8 ohms
System resonance: 68Hz, Q=0.7
Frequency response: 70-20,000Hz +/-3dB
Sensitivity: 86dB spl at 1m for pink noise input of 1W
Maximum output: 103dB spl on programme peaks under typical listening conditions
Finishes:  Black plinth
Grille: Black cloth
System: SP1126
Drive units: B200 bass unit (SP1070), T33 tweeter (SP1074)
Crossover: SP1136

 

Download Model 303 Brochure
Download Model 304 Brochure