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ALTEC LANSING INDUSTRIAL PROFESSIONAL SOUND PRODUCTS MICROPHONE LIST

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D90P Announce & Paging Microphone

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1597B Passive Monitor Panel

SPECIFICATIONS


Type: Moving Coil Dynamic
Frequency Response: 50 to 15,000 Hz (with
shutter closed). Up to 14 dB of low-frequency attenuation at 50 Hz by varying position of shutter.
Output Impedance: 150/250ft
Output Level: -58 dBm/10 dynes/cm'*
Pickup Pattern: Omnidirectional
Hum: -120 dB (Re: 10' gauss)
Control Facility: Momentary contact switch with lock-on device on microphone handle and with extra contacts (wired to extra conductor in cable) for actuation of relays, indicator lights, etc.
Dimensions: 71/z " H x 3" D x 15/a" maximum diameter
*10 dynes/cm' = 1 Pascal = 10 Microbars

Weight: 1 lb.
Finish: Satin chrome
Mounting: Matching 34A Shock Mounting Desk Stand, threaded for attachment of microphone. The D90P also may be utilized on any type of boom, wand, or floor mount having standard 5/a"-27 male
threads. •
Connections: 15 feet of 3-conductor cable, 80% shielded, is supplied, permanently attached to the microphone.
Accessories: Altec 34A Shock Mount Desk Stand.

ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The microphone shall be of the dynamic moving-coil type, with an omnidirectional pickup pattern and a variable low-frequency adjustment controlled by rotating a shutter on the rear of the microphone housing. The low-frequency adjustment shall provide a maximum bass attenuation of 14 dB at 50 Hz. With the shutter fully open, the microphone shall have a frequency response from 50 to 15,000 Hz.
The microphone shall meet the following performance criteria. Output level (sensitivity), -58 dBm/ 10 dynes/cm'. Hum level, no higher than -120 dB (Re: 10-3 gauss). Output impedance, 150/250 ohms.
The microphone diaphragm shall be polyester, and shall be resistant to the effects of shock, blast and corrosive fumes. The microphone shall include a sintered bronze filter to protect the acoustic elements from performance deterioration caused by airborne ferrous particles and dust.
The microphone shall be provided with a momentary contact switch with a selectable lock-on featureenabling the switch in the 'on' position without the user maintaining pressure on the switch. The switch shall provide silent operation when switched to the 'on' position so that no mechanical noise shall be transmitted through the equipment. The switch shall have an extra set of contacts for shunt operation of additional equipments; e.g., indicator lights, buzzers, relays, etc. The microphone shall be supplied with 15 feet of 3-conductor cable, of which 2 conductors shall be shielded, and shall be permanently attached to the microphone housing. The third conductor in the cable shall be wired to the extra set of contacts in the switch.
The microphone shall be 71/z" H x 3" D (when vertically mounted) x 1 %u" Dia. The microphone housing and handle shall be a single casting. The weight of the entire microphone assembly shall not exceed one pound and the finish shall be satin chrome.
The microphone shall be the Altec Model D90P.

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