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Altec Lansing 1224A

Electronic Crossover Biamplifier

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Altec Lansing 1224A


The Altec 1224A and 1224AX are rugged electronic crossover biamplifiers designed to be installed in the cabinets of permanently installed, portable sound reinforcement and reproduction speaker systems.

The 1224A and 1224AX are identical in all respects except for line voltage requirements. The 1224A operates on 120V AC 50/60 Hz; the 1224AX, on 240V AC 50/60 Hz. Either model, however, can be field converted to operate on 240V or 120V AC.

The biamplifier includes electronic crossover circuitry and separate low-frequency and high-frequency amplifiers in a single, compact package. The electronic crossover circuit divides the input signal into separate bass and treble channels before amplification. Electrically separate amplifiers drive the low-frequency speaker and high-frequency driver. Crossover frequencies of 500Hz, 800Hz and 1500Hz with 12 dB/octave slope rates are selected by a slide switch located on the back of the unit.

Input connection is made via an XLR type, 3-pin, female connector. A parallel XLR 3 pin male connector is provided for conveniently connecting two or more biamplifiers to a single driving source. Output connections are made through four push-type connectors on the unit's side.

Two gain controls are provided. A full-range gain control balances the output of the biamplifier with another biamplifier or conventional amplifier driven from the same source, and a high-frequency gain control provides high-frequency to low-frequency spectral balance.


Bass amplifier: 60 watts into 8 ohms

Treble amplifier: 30 watts into 8 ohms

Total harmonic distortion: 0.5%

Minimum load impedance: 2 ohms

Input sensitivity: 0.8V (direct input)

Signal to noise ratio: 80dB

Dimensions: 165 x 251 x 229mm

Weight: 7.3kg


service manual   English - zelgall

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This website is not affiliated with or sponsored by Altec Lansing. To purchase 1224A spares or accessories, please contact the company via their website or visit an authorised retailer.