so as not to draw attention.
The PZM-11has a mic-level output and is powered by 12-48V phantom power.
The PZM-11LLhas a line-level output and can be powered by 24V AC, 12-24V DC, or 12-48V phan- tom power. Since the PZM-11LL has a high output, it can be plugged directly into a VCR line input—no costly mic preamp is needed.
To phantom power the PZM-11LL, a modification will have to be made to the electronics module (see Installation Step 3 for details).
Like other Pressure Zone Microphones, the PZM-11and PZM-11LL utilize the Pressure Re- cording Process™ in which a miniature condenser microphone capsule is mounted very close to a sound-reflecting plate or boundary. The capsule is mounted in the “Pressure Zone” just above the boundary, a region where sound coming directly from the sound source combines in-phase with sound reflected off the boundary. The benefits are a wide, smooth frequency response free of phase interference, excellent clarity and “reach,” and con- sistent pickup anywhere around the microphone.
In the PZM-11and PZM-11LL, low frequencies below the voice range are rolled off to reduce pickup of air-conditioning rumble. The high-fre- quency response is boosted slightly to aid clarity and articulation.
The microphone connector is a row of screw termi- nals for easy installation. The output is balanced, low impedance, which allows long cable runs without hum pickup or high-frequency loss.
Installation
1.Please refer to Fig. 3 (PZM-11) or Fig. 4 (PZM- 11LL) and locate all the parts shown.
2.Run a 2-conductor shielded mic cable to the hole where you intend to install the microphone. Install a standard electrical outlet box in the hole.
To use phantom power, you need a mixer with phantom power or an external phantom-power supply. Crown makes a PH-1A phantom power supply which has 1 channel and is AC-adapter powered.
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Specifications
Type: Pressure Zone Microphone.
Element: Electret condenser.
Frequency response (typical): 80 Hz to 20,000 Hz. See Fig. 1.
Polar pattern: Hemispherical.
Impedance:
PZM-11: 225 ohms, balanced.
PZM-11LL: 75 ohms, balanced. Recommended minimum load impedance 1000 ohms.
Open circuit sensitivity:
PZM-11: 5 mV/Pa* (–46 dBV/Pa).
PZM-11LL: 1.4V/Pa* (+3 dB re 1V/Pa).
Power sensitivity:
PZM-11: –45.5 dBm/Pa*
PZM-11LL: +8 dBm/Pa*.
Equivalent noise level (self-noise): 26 dB SPL typi- cal (0 dB = .0002 dyne/cm2), A-weighted.
S/N Ratio: 68 dB at 94 dB SPL.
Maximum SPL:
PZM-11: 120 dB SPL produces 3% THD.
PZM-11LL: 100 dB SPL produces 3% THD.
Output connector: Three screw terminals. 1 = ground, 2 = audio hot (in polarity), 3 = audio cold (opposite polarity).
Polarity: Positive pressure on the diaphragm pro- duces a positive voltage on screw terminal 2 with respect to screw terminal 3.
Operating voltage:
PZM-11: Standard phantom power, 12 to 48V DC on screw terminals 2 and 3 with respect to screw terminal 1.
PZM-11LL: 24V AC, 12-24V DC, or phantom power as the PZM-11LLS2.
Current drain:
PZM-11: 400 microamperes.
PZM-11LL: 4 milliamperes.
Materials: Steel plate and high-impact plastic capsule holder.
Finish: Off-white. May be painted any color; take care to first seal the opening between the mic capsule and boundary plate.
Operating Temperature Range: –10° to +60° C (+14° to +140° F).
