Crest Audio PFA600 User manual

Information Sheet
* Continuous sine wave power is limited by current rating of front panel circuit breaker and IGM circuit.
Power Specifications
4 Ohm Stereo
2 Ohms (Channel A Only)
8 Ohms Bridged
20Hz - 20kHz
<0.1% THD
600 Watts
600 Watts
1200 Watts
EIA
@ 1 kHz, <0.05% THD
650 Watts
650 Watts
1290 Watts
*
PFA
SERIES
PFA600
DC-POWERED
AMPLIFIER
Crest’s PFA600 is a compact, extremely powerful DC-powered
amplifier designed for portable and mobile applications where
AC is either unavailable or impractical. The PFA600 matches the
same uncompromisingly high-quality circuitry used in the Crest
Professional Series amplifiers with two high-efficiency DC-to-
DC switching power supplies, incorporating Class H modulated
supply rails for further efficiency.
Three rack spaces high, the PFA600 runs on 24 volts DC. A
forced-air configuration is used to cool channel heat sinks mount-
ed in a back-to-back tunnel arrangement. Input/Output barrier
strips, Octal Sockets and circuit breaker/power switches are pro-
vided for each channel.
The rugged steel chassis is designed for long-term structural
soundness. Either channel can be independently switched off if
not required, conserving battery power.
The PFA600, like Crest’s Professional and CC/CV Series ampli-
fier, features comprehensive protection circuitry, including IGM,
which allows the amplifier to operate safely even into very
stressful loads, and Auto-Ramp, which gradually increases gain
when the amplifier is initially powered up or comes out of a pro-
tect mode.

PFA SERIES - PFA600
AMPLIFIER SPECIFICATIONS
The power amplifier shall have two channels. Each will deliver a mini-
mum of 600 watts into 4 ohms, both channels driven, 20Hz-20kHz.
Channel A shall have the further capability of delivering 600 watts into
2 ohms. In bridged mode, the amplifier shall deliver a minimum of 1200
watts into 8 ohms, both channels driven, 20Hz-20kHz. The amplifier shall be fan-cooled. It
shall have circuitry to protect itself and the speaker load from output short circuits, DC volt-
age on outputs, and thermal overload. It shall have impedance sensing circuitry, an RMS clip
limiter and Auto-Ramp™ signal control. Output relays shall protect the speaker load from
any type of amplifier failure. The amplifier shall have a voltage gain of 40x with an input
sensitivity of 500mV for rated power at 4 ohms. The hum and noise level shall be at least
101 dB below rated output, “A” weighted. SMPTE IMD shall be less than 0.04% at rated
power. The frequency response shall be greater than 20Hz-20kHz, +.1, -.5dB at rated power.
The amplifier will operate on 24 volts DC. Each channel shall be powered independently by
a 1 kVA DC-to-DC switching power supply, with Class H operation for high efficiency, and
have a magnetic circuit breaker/power switch. Maximum current draw shall be no greater
than 45 amperes per channel at rated power into a 4 ohm resistance. Indicators shall include
Clip/Limit, Signal, Protect, and Active LED’s for each channel, as well as an Undervoltage
LED, an On LED, and an Overvoltage LED. The amplifier shall have an attenuator control
for each channel, a signal ground lift jumper, remote on/off connections, and DC power
input terminals. The inputs shall be actively balanced and have female XLR-type 3-pin con-
nectors (pin 3+) and barrier strip connectors. Output connectors shall be barrier strips, with
three parallel outputs per channel. The amplifier shall have Octal Sockets for optional acces-
sory modules. All connections (input, output, power, control, and accessory), sockets, con-
trols, switches, jumpers, and indicators shall be located on the front panel. The packaging of
the amplifier shall allow for standard rack mounting without requiring space between similar
units. Dimensions shall be 5.25" (13.34cm) high, 19" (48.26cm) wide, and 15" (38.10cm)
deep. The amplifier shall have a net weight 41 lbs. (23.10kg). The amplifier shall be desig-
nated the Crest Audio Model PFA600.
Architect’s
Specifications
PFA600
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification.
Crest Audio specification literature is available in downloadable PDF format; visit our website at: http://www.crestaudio.com. ©1997 Crest Audio Inc.
v. 1.1 7/9/97
Max RMS Voltage Swing
Max Peak Voltage Swing
Frequency Response
THD
SMPTE IMD
Slew Rate
Damping Factor
Input CMRR
Voltage Gain
Input Sensitivity
Input Impedance
Hum and Noise (“A” Weighted)
Connectors (per channel)
Power Supply
Max Current Draw
Cooling
Controls
LED Indicators (per channel)
Protection
Construction
Dimensions (H x W x L)
Gross Weight
Net Weight
Warranty
67V, each channel
97.5V, each channel
20 Hz - 20 kHz; +.1, -.5dB, 600W into 4 Ohms
<0.015% @ 600W into 4 Ohms, 1kHZ
<0.04% @ 450W into 4 Ohms, 60Hz& 7kHz
35V / µs, input filter bypassed
400:1, @ 1kHz, 8 Ohms
>97.9 dB
40x standard, others upon request
500mV RMS for full power at 4 ohms
>20k Ohms, actively balanced
>101dB
Input barrier strip, Octal Socket, barrier strip with 3 parallel outputs
Two 1 kVA power transformers, DC-to-DC switching supplies
5A @ 24 VDC (45A @ 24VDC - 600 Watts into 4 Ohms)
Rear to front tunnel heatsink, 100 CFM DC fan
2 front panel attenuators, 2 circuit breaker/power switches, signal ground lift jumper, remote on/off
Clip/Limit, Signal, Protect, Active, On, Undervoltage, Overvoltage
High temp., DC voltage, turn-on/turn-off transient, subsonic, ultrasonic, short circuit, IGM™, AutoRamp™
Modular, 14 ga. steel chassis
5.25"x19"x15" (16" to rear ears); 13.34cm x 48.26cm x 38.10cm (40.64cm to rear ears)
55.0 lbs (24.52 kg.)
41.0 lbs (23.10 kg.)
5 years, parts and labor
B8000001
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
Printed in USA