KEY FEATURES
• Enhances low frequency performance of small loudspeaker systems.
• Externally adjustable bass boost to suit user preference.
• Electrically balanced inputs for high common mode rejection.

KEY SYSTEM SPECIFICATIONS

Input Impedance: l 5k0 unbalanced 30kSZ balanced

Maximum Input Level: + 15dB (Reference OdBu = 0.775 Vrms)

CMRR: >50 dB

Output Type: Unbalanced

Output Impedance: <501l

Noise Floor: >90 dB

Power Requirements: ± 15 VDC, 25 mA Minimum Load Impedance: 2kSZ Intermodulation Distortion: <0.01% at OdBu

The ALTEC LANSING model 15599A is a Bass Enhancement Module used to enhance the low frequency performance of selected loudspeaker systems. The module plugs directly into the powered octal socket of Anniversary Series power amplifier products. The 15599A can be externally adjusted by the user to vary the amount of low frequency enhancement.

The 15599A uses Active Filter design in a Multiple Feedback Network. The circuit utilizes a direct signal path in conjunction with a sidechain path for processing low frequency enhancement. In the direct signal path, the audio signal is passed from the input stage to the output without any processing. The sidechain path is used to filter and shape the waveform of the audio signal, which is then added to the direct signal path. A time delay
exists in the sidechain path thus causing the summed output to have an increase in low frequency energy. The resulting sound is perceived by the ear as being fuller although there is no significant increase in amplitude.

The 15599A obtains its power from the powered octal accessory socket on Altec Lansing's Anniversary series power amplifiers. This negates the need for an external power source. The circuit is designed to operate from a bipolar ±15 VDC supply with a current draw of approximately 25 mA.

The 15599A is easy to install and use. Simply remove the jumpers from the octal accessory socket and plug in the module. The 15599A can be very useful in professional installations.