300 Series

301 (1981)
The 301 (also known as the Chorus/Capella) utilised a lightweight paper diaphragm for the bass driver, which coupled with a high efficiency cone tweeter, allowed for a system of high sensitivity and high output capability in a medium sized enclosure.
 
 
302 (1981-83)
The 302 (also known as the Carina) was a two-way, three drive unit loudspeaker of high efficiency capable of producing high quality sound loud enough to satisfy the needs of those who like to listen at realistic, live volume levels.
 
The system format followed on from that used in the Concord IV – what we call today a 2½-way system – where the two bass drivers operate together at the low frequencies but only the upper unit continues through the midrange to the crossover with the high frequency unit. The twin bass drivers bring advantages including higher maximum output and reduced distortion, making the 302 an ideal loudspeaker for heavy rock music as well as the newly developed digital compact discs with their extended bass response.
 
303.2 (1980-83)
304.2 (1980-81)

Models 303.2 and 304.2 were the export versions of the Celeste IV and Concord IV.
 
The Celeste IV and Concord IV were distinctive for their industrial design, the all-round black grille cloth and matching ULS 40 single pedestal stand allowing them to stand out from the conventional square wooden boxes of the time.
 
Celeste IV 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 mark IV versions were different from the mark IIIs by virtue of the moulded plinth and top caps and a wide selection of coloured grille cloths.
 
The B200 bass drivers for the Celeste III/IV and Concord III/IV featured a new three-sided chassis specifically designed to be mechanically isolated from the cabinet – the first example of driver decoupling in the KEF range. They were also the first KEF bass drivers to use a paper diaphragm – by this time paper diaphragms were being manufactured with good consistency and the lower moving mass contributed to the high sensitivity target for these systems.
 
 
303.3 (1981-83)
304.3 (1980)

Unlike the ‘all-round’ grille covering of the mark 1 and 2, the mark 3 versions of the 303 and 304 used a standard wood finish cabinet and front fitting grille. Otherwise, the acoustical design was essentially the same
 
Specification: 301
System Type: Two-way, bookshelf/stand-mount
Enclosure type: Closed box
Size: 470 x 280 x 220mm (18.5 x 11 x 8.7 inches)
Weight:
Nominal Impedance: 8 ohms
Rated maximum power: 50W programme
Frequency response: 70-17,000Hz +/-3dB at 2m on design axis (-10dB at 50Hz and 22kHz)
Sensitivity: 89dB at 1m for a pink noise input of 1W (anechoic conditions)
Maximum output: 106dB on programme peaks under typical listening conditions
System: SP3008
Drive units: bass unit (SP1078) and tweeter (SP1077)
Crossover: SP2000
 
Specification: 302
System Type: 2½-way, stand-mount
Enclosure type: Closed box
Size: 570 x 330 x 250mm (23.5 x 13 x 9.85 inches)
Weight: 9.4kg (20.7 lb)
Nominal Impedance: 8 ohms
Rated maximum power: 70 programme
Frequency response: 55Hz to 20kHz +/-3.0dB at 2m on design axis (-10dB at 45Hz and 30kHz)
Sensitivity: 91dB at 1m/1W (anechoic conditions)
Maximum output: 109dB on programme peaks under typical listening conditions
System: SP3009
Drive units: 2 x B200 bass unit (SP1079), T33 tweeter (SP1080)
Crossover: SP1183
 
Specification: 303.2
System Type: Two-way, bookshelf/stand-mount
Enclosure type: Closed box
Size: 52.4 x 26.5 x 23cm (20.6x 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 or brown plinth and top
Grille: Black or brown grille fabric as appropriate. Beige, blue, red, green or grey available as optional accessories
System: SP1147
Drive units: B200 bass unit (SP1070), T33 tweeter (SP1074)
Crossover: SP1136
 
Specification: 304.2
System Type: 2½-way, bookshelf/stand-mount
Enclosure type: Closed box
Size: 68 x 28 x 31.5cm (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:  Black or brown plinth and top
Grille: Black or brown grille fabric as appropriate. Beige, blue, red, green or grey available as optional accessories
System: SP1148
Drive units: 2 x B200 bass unit (SP1069), T33 tweeter (SP1074)
Crossover: SP1137
 
Specification: 303.3
System Type: Two-way, bookshelf/stand-mount
Enclosure type: Closed box
Size: 52 x 26.5 x 23cm (20.6x 10.5 x 9 inches)
Weight: 8kg (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 (-10dB at 50Hz and 25kHz)
Sensitivity: 86dB spl at 1m for pink noise input of 1W
Maximum output: 103dB spl on programme peaks under typical listening conditions
System: SP3002
Drive units: B200 bass unit (SP1070), T33 tweeter (SP1074)
Crossover: SP2002
 
Specification: 304.3
System Type: 2½-way, bookshelf/stand-mount
Enclosure type: Closed box
Size: 68 x 28 x 31.5cm (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
System: SP3003
Drive units: 2 x B200 bass unit (SP1069), T33 tweeter (SP1074)
Crossover: SP2003