Peavey PZS 140 User Manual

OWNER’S MANUAL

ARCHITECTURAL ACOUSTICS

PZS

™

140

Multi-Zone Mixer/Amplifier

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WARNING: To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture. Before using this appliance, read the operating guide for further warnings.

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PZSª140

Multi-Zone Mixer/Amplifier

DESCRIPTION:

The Peavey Architectural Acoustics PZSª140 is a five-channel mixing system with assignment capability to four independent powered zones. Each channel offers low and high equalization, channel level control, and zone assignment switching. Channels one and two offer low-Z (XLR) microphone inputs for paging capability, while channels three through five offer dual (paralleled) RCA jacks for use with various music sources. All five channels also have detachable screw terminal connectors with Low-Z mic inputs and High-Z inputs. Additionally, channels one and two have recessed screwdriver controls for threshold and paging hold time. Each zone has a master level control, signal presence and clipping LED indicators, and detachable connectors for preamp out/power amp in. Each zone power amp is rated at 35 W RMS and provides a 4-ohm direct output and transformer isolated 8-ohm, 25- and 70-volt outputs.

FEATURES:

¥ Five input channels ¥ Four zones ¥ 35 watts output per zone ¥ Two XLR low-Z mic inputs (balanced) ¥ Detachable input connector for Low-Z mic and High-Z line on each channel ¥ Signal LED indicator for each channel ¥ Channel level control ¥ Low and high active EQ for each channel ¥ Four zone assignment switches for each channel ¥ Front panel adjustable threshold and paging hold on channels 1 and 2 ¥ Four master output level controls with signal and clipping LED indicators ¥ Detachable preamp output/power amp input connector for each zone ¥ 48 volts phantom power on all low-Z inputs ¥ Each zone output provides a 4-ohms direct output and transformer isolated 8-ohms, 25- and

70-volt outputs ¥ Each zone has a 600-ohm line level balanced output ¥ 19" standard rack-mount package ¥ Three rack spaces ¥ Externally accessible mains fuse

FRONT PANEL FEATURES:

1. CHANNEL LEVEL CONTROLS

Controls the signal level being sent to the assigned zones from each channel.

2. CHANNEL LOW EQ CONTROL (BASS)

Active shelving type equalization control that adjusts the channel low-frequency response. Clockwise rotation boosts low frequencies while counter-clockwise rotation reduces low frequencies.

3. CHANNEL HIGH EQ CONTROL (TREBLE)

Active shelving type equalization control that adjusts the channel high-frequency response. Clockwise rotation boosts high frequencies while counter-clockwise rotation reduces high frequencies.

4. CHANNEL 1 and 2 THRESHOLD CONTROL (SCREWDRIVER)

Controls the level of signal needed to trigger the ducking circuitry in channels 1 and 2. When the ducking circuit is active, the music levels will be reduced by 20 dB to allow the page to be heard. Turning the control clockwise increases the sensitivity of the ducking circuitry. Turning the control completely counter-clockwise defeats the channelsÕ ducking capabilities.

NOTE: This control and the channel level control (1) are not related, i.e., the channel level control does not effect the threshold level sensitivity. The threshold control should be set high enough that normal speech into the microphone (paging) will trigger the ducking circuitry, but not so high as to allow the normal room ambient noise level to trigger the ducking circuitry. This usually takes some experimentation and will vary depending upon applications.

5. CHANNEL 1 and 2 HOLD CONTROL

Controls the amount of time the signal is held ducked after the page has been completed. Clockwise rotation increases the hold time to a maximum of four seconds. Counter-clockwise rotation decreases the hold time to a minimum of 0.5 seconds. The hold time should be set long enough to prevent the ducked signal from returning to normal levels during a page.

6. SIGNAL PRESENCE LED

Green LED that indicates a signal is present in the channel. The signal is sampled directly from the preamp (before the level control) and will illuminate even if the level control is turned completely down. A signal level of -60 dBu or greater in the channel will illuminate this LED.

14 13

8 9

FRONT PANEL:

7. CHANNEL 1 ZONE ASSIGNMENT SWITCHES

Switches used to route the signal to the desired zone.

OPERATION NOTE: Anytime channel one is assigned to a zone and a signal is present in

channel one all other channels assigned to that zone will be ducked by 20 dB. This enables

channel one to be used for emergency override signals. This function can be disabled by

turning the threshold control completely counter-clockwise.

8. CHANNEL 2 ZONE ASSIGNMENT SWITCHES

Switches used to route the signal to the desired zone.

OPERATION NOTE: Anytime channel two is assigned to a zone and a signal is present in

channel two, all other channels assigned to that zone will be ducked by 20 dB (except

channel one). This function can be disabled by turning the threshold control completely

counter-clockwise.

9. CHANNEL 3 THRU 5 ZONE ASSIGNMENT SWITCHES

Switches used to route the background audio signal to the desired zone. Selecting a

particular zone button routes the audio source associated with that particular channel to the

desired zone. The zone assignment switches can be used to route the audio to one or more

zones if desired.

10. MASTER ZONE LEVEL CONTROLS

Controls the signal level being sent to each zone amplifier. Normally these controls should be

set at the 12:00 position and the overall system levels set using the various channel level

controls. This setting yields the best compromise for system noise performance and signal

headroom.

11. ZONE ACTIVE LEDS

Indicates whenever any signal activity is occurring in that particular zone. These LEDs will

light whenever a signal level above 50 mW RMS occurs in the associated zone power amp.

These indicators are helpful for setting up the zone signal levels.

12. ZONE CLIP LEDS

Indicates clipping may be occurring in that particular zone. These LEDs will light whenever a

signal level of 35 W RMS occurs in the associated zone. If these LEDs occasionally, flash

only on peaks of the music or paging signal, audible clipping is probably not occurring. If

these LEDs come on and stay on, then the power amps are clipping and audible distortion is

probably occurring in that zone.

OPERATION NOTE: These LEDs are only an indication of the level being sent to the power

amps from the preamp. If a signal processor is used in the insert point, it must be set up in a

way that it does not add/reduce the system gain. If the signal processor changes the signal

level between the preamp and power amp the LEDs are no longer accurate.

13. POWER SWITCH

Rocker type switch, depress to

onÓ position to power unit.

14. POWER LED

Indicates when AC power is being supplied to the unit and the power switch is ÒonÓ.

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