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Reference Series Model 105/3 (1989-94)
Model 105/3 was the first Reference Series loudspeaker to incorporate Uni-Q technology. It was a four-way system, employing six drive units, with very high sensitivity, high output capability and outstanding power handling capacity.
Several design features of the 105/3 were directly derived from the acclaimed Model 104/2. Bass reproduction was handled by development of the 104/2’s coupled cavity system, and the separate midrange enclosure module was also retained and developed – this time to incorporate two dedicated lower midrange drive units and the new Uni-Q upper midrange/tweeter driver array.
Consistent with other the Reference Series loudspeakers, Model 105/3 included conjugate load matching to improve the amplifier-speaker interface and performance was enhanced with the use of the KUBE 200 active equaliser. In the case of Model 105/3 and the Reference Series systems that followed, the use of the matching KUBE was not essential, the loudspeakers were optimised to function in standard passive configuration.
The addition of Uni-Q coincident source technology allowed a major improvement in directivity control, in particular, the removal of the constrained vertical directivity of convention loudspeakers caused by the vertically separated midrange and high frequency drive units.    
Specification: Model 105/3
System Type: Four-way, floor standing
Enclosure type: Coupled cavity
Size: 1104 x 280 x 405mm (43.5 x 11 x 16 inches)
Weight: 42kg (92.5 lb)
Nominal Impedance: 4ohms resistive (20Hz -20kHz)
Rated maximum power: 300W programme (into 4 ohms)
Frequency response: 49Hz to 20kHz +/-2.5dB at 2m on reference axis (-6dB at 20Hz when used with KUBE 200)
Sensitivity: 93dB at 1m on reference axis for a pink noise input of 2.83V (anechoic conditions)
Maximum output: 115dB on programme peaks under typical listening conditions
System: SP3111
Drive units: 2 x B200 bass unit (SP1256), 2 x B160 lower midrange units (SP1257), B160 upper midrange unit (SP1258), NT25 tweeter (SP1240)
Crossover: SP2155 and 2156