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K/AK series drivers 12 inch

K20
K12/20
AK120
AK121
AK122
AK123
AK124

K20

Dated 1947. No further information known.

K12/20

K12/20 20 Watt 15 Ohm.
These were marketed to the professional sector as auditorium drivers.

AK120

Specifications

General purpose model using dust excluding construction.
Impedance: 15 Ohm.

Paper cone/surround.
Voice coil diameter: 1.78 inches.
Gap flux: 14,000 gauss.
Total flux: 160,000 Maxwells.
Power handling: 15 watts.
Frequency response: 40-12,000 Hz
See here for a brochure on the Hifi Literature website

AK121

Bass speaker with low resonance cone and using dust excluding construction. 30 Hz to 5,000 Hz, 15 Ohm.

AK122

As 121 but 7.5 Ohm voice coil.

AK123

Heavy duty general purpose driver with open construction and 15 Ohm impedance.

12 inch intended for use in dual channel cinema speaker systems. Rated at 15 Ohms and 20 Watts RMS and has an open spider rear suspension Both have field replaceable cone and coil assemblies.

AK124

As AK123 but with has a fully dust excluding construction.

Specifications
Rated at 15 watts.
12" paper cone and surround/
1.78" voice coil/
Gap flux 16k gauss/
Total flux 180k Maxwells
15 Ohm
30-13khz
Impedance at 400 Hz 15 Ohms
Resonance 30/35 Hz

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