Crest Audio PA150 User manual

PA™150 power amplifier
description
The PA 150 is a rugged,medium-power amplifier with features
that make it stand alone in the industry.It’s a rack-mountable
unit which occupies only one rack space, and yet packs a 75W RMS
per channel punch into 4,8,or 16 Ohms.It’s selectable;a feature
seldom found on the typical solid state amp.In bridge mode, this unit
delivers 150W RMS into 8, 16, and 32 Ohms.You might ask why 32
Ohms;that’s the load impedance for a 150Watt,70Volt distribution
system.There’s no fan in this unit to make noise.Adequate cooling is
provided by two massive heat sinks.Each channel is protected from
excessive operating temperatures with a thermal/fault system that is
automatic, and only activates under extreme conditions.
The PA 150 has an exclusive SPS compression system that senses
conditions which might overload the amplifier and activates
compression circuitry when clipping is imminent.This technique uti-
lizes every preciousWatt available to power transformer with three
different voltage taps.The rear panel three-position selector switch
then gives this amp the impedance selection capability by changing the
internal“rail” operating voltages.Toroidal power transformers offer
very high efficient operation (cool), have very low magnetic fields
(hum),and are relatively small in size (weight).
All controls are located on the rear panel,and each channel is
equipped with a separate level control.The inputs are
electronically balanced.Both input and output are accessed via
barrier strips.
High slew rate,high damping factor,low distortion,and awesome
features make the PA 150 the obvious choice for most demanding
commercial/professional applications and permanent
installations.
features
• 19” rack-mountable
• one rack space
• 75W RMS per channel
• 150W RMS bridge mode
• selectable 4,8,or 16 Ohms
• SPS™compression on each channel
• electronically balanced inputs
• convection cooled
front panel
• heavy-duty rocker power switch
• LED power indicator
• SPS activation LED on each channel
rear panel
• barrier strip inputs
• barrier strip outputs
• detented 1 dB level controls
• stereo/bridge mode switch
• impedance selector switch
• ground lift switch
Spec Sheet for Crest Commercial Series

specifications PA™150 power amplifier
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
Preliminary Specs
Crest Audio reserves the right to make
improvements in manufacturing or design
which may affect specification.
PA
150
power
amplifier
preliminary
spe
c
ifi
c
ations
Characteristics (@ 120 V AC, 60 Hz) [impedance selector setting]
stereo mode, both channels driven
4 Ohms, 1 kHz, 1% THD - 85 W RMS/channel (4 Ohms)
8 Ohms, 1 kHz, 1% THD - 85 W RMS/channel (8 Ohms) (25 V)
16 Ohms, 1 kHz, 1% THD - 85 W RMS/channel (16 Ohms)
bridge mode, mono
8 Ohms, 1 kHz, 1% THD - 170 W RMS (4 Ohms)
16 Ohms, 1 kHz, 1% THD - 170 W RMS (4 Ohms)
32 Ohms, 1 kHz, 1% THD - 170 W RMS (16 Ohms) (70 V)
stereo mode, both channels driven
4 Ohms, 20 Hz to 20 kHz, 0.1% THD - 75 W RMS per channel (4 Ohms)
8 Ohms, 20 Hz to 20 kHz, 0.07% THD - 75 W RMS per channel (8 Ohms) (25 V)
16 Ohms, 20 Hz to 20 kHz, 0.05% THD - 75 W RMS per channel (16 Ohms)
bridge mode, mono
8 Ohms, 20 Hz to 20 kHz, 0.1% THD - 150 W RMS (4 Ohms)
16 Ohms, 20 Hz to 20 kHz, 0.07% THD - 150 W RMS (8 Ohms)
32 Ohms, 20 Hz to 20 kHz, 0.05% THD - 150 W RMS (16 Ohms) (70 V)
stereo mode, both channels driven
20Hz to 20 kHz, at rated power andload
below 0.1% (4 Ohms)
below 0.07 (8 Ohms)
below 0.05% (16 Ohms)
input attenuator set FCW, at rated power and load
0.7 V RMS (-3 dBV) (4 Ohms)
1.0 V RMS (0 dBV) (8 Ohms)
20 kilohms (28 dB gain)
stereo mode, each channel: 15 Volts per µSec
bridge mode, mono: 30 Volts per µSec
stereo mode, both channels driven
±1 dB, 1 W RMS at rated load 10 Hz to 40 kHz
±2 dB, at rated power and load 20 Hz to 20 kHz
stereo mode, both channels driven, at rated load, 1 kHz
greater than 100 (4 Ohms)
greater than 200 (8 Ohms)
greater than 400 (16 Ohms)
stereo mode, both channels driven below rated power, unweighted
97 dB (4 Ohms)
100 dB (8 Ohms)
103 dB (16 Ohms)
stereo mode, both channelsdriven at rated power and load
2.5 A at 120 V AC
height: 1.75”(4.4 cm)
width:19”(48.3 cm)
depth:8”(20.3 cm)
weight: 22 lbs. (10.0 kg)
output power (typical value)
rated output power
distortion
input sensitivity and impedance
slew rate (typical value)
frequency response (typical value)
damping factor (typical value)
hum and noise
power consumption
dimensions and weight
Architectural and Engineering Specifications
The amplifier shall have two channels, each capable of producing an output of more than 75 Watts RMS into 4, 8, or 16 Ohm loads, both channels operating from 20 Hz to
20 kHz continuously at less than 0.1% THD. In bridge mode, the amplifier shall be capable of producing an output of more than 150 W RMS into 8, 16, or 32 Ohm loads,
operating from 20 Hz to 20 kHz continuously at less than 0.1% THD. Full output shall be achieved by an input signal of not more than 1.0 V RMS (0 dBV) per channel. Each
channel shall be equipped with unique compression circuitry that electronically senses the onset of clipping and engages a specially designed circuit which virtually eliminates
the possibility of driving the amplifier into clipping or distortion. An LED shall indicate when this patented SPS™compression is activated.
Each channel shall have a +0, -1 dB frequency response from 10 Hz to 40 kHz at 1 W RMS into 4 Ohms and a +0, 0.2 dB frequency response from 20 Hz to 20 kHz at 75
W RMS into 4 Ohms, and shall have a slew rate of at least 15 Volts per microsecond. The total harmonic distortion shall be less that 0.1% at 75 W RMS into 4 Ohms from
20 Hz to 20 kHz, and the hum and noise shall be at least 100 dB below full rated output power measured 20 Hz to 20 kHz with a 600 Ohm input termination.
The amplifier shall be stable into any load configuration with any combination of open or grounded input connections. It shall be short, mismatch, or open-circuit proof. It
shall have massive aluminum heat sinks that are convection cooled and a thermal shutdown system to protect the amplifier from over-temperature operation. This thermal
protection system shall be automatic and self-resetting.
The amplifier shall have all input and output patching capabilities on the rear panel. Each amplifier channel shall have an input barrier strip and an output barrier strip.
Further, each channel shall contain a detented level control offering 1 dB per detent attenuation. Additionally the back panel shall contain switches for stereo/bridge select,
impedance selection and ground lift.
The front panel features shall include a rocker mains switch, an LED power indicator, and dual LED SPS activation indicators.
The unit shall be rack-mountable in a standard 19”rack requiring 1 3/4”height (one rack space). The unit weight shall be 22 lbs., with dimensions 19”wide x 1 3/4”high x
8”deep. The amplifier shall operate on a 120 V AC, 50/60 Hz, and consume 300 Watts. The published specifications shall be met or exceeded.
PA 150 amplifier specifications