Crest Audio ST1000 User manual

ST1000 - ST2000
Power Amplifiers
SERIES
Features Description
• Dramatically reduced net weight
• Switching power supply / switching output stages
• Very low current draw
• Latest generation of high-speed, wide-bandwidth output devices
• Cooled by variable speed fan with back-to-front airflow
• Inputs - Balanced female XLR, 1/4” TRS and three pin Phoenix
• Outputs - Speakon and five-way binding posts
• Mode selector switch for stereo, parallel and bridged-mono operation
• Ground-lift switch and rear panel circuit breaker
• Recessed, stepped attenuators with removable knobs
• 16-gauge steel chassis, 14-gauge steel front-panel
TourClass®protection circuits
ACL (Active Clip Limiting) prevents speaker damage by providing
gentle gain reduction when signal approaches the clipping thresh-
old.
IGM (Instantaneous Gain Modulation) monitors speaker loads to
detect conditions that may overstress output devices. This allows
safe operation into nominal 2Ωspeaker loads.
AUTORAMP gradually increases gain to the attenuator level-set-
tings when the amplifier is turned on. This prevents abrupt turn-on
level.
Other protection features include: short circuit, dc voltage, com-
prehensive thermal management, current in-rush turn-on/off tran-
sient, and sub/ultrasonic input.
The ST Series amplifier is the flagship in a family of elevated
efficiency amplification from Crest Audio. The ST amplifier
represents a new benchmark in switching amplification: pro-
viding the expected advantages of low-weight and reduced
heat, while preserving the sonic integrity for which Crest
Audio is known. With the latest in switching technology
onboard, this feature-rich product has the contemporary look,
feel and sound of a touring class amplifier. The ST Series is
competitively priced and is well suited for a wide range of
applications.
Resonant-switching power supply
The ST amplifier switching power supply employs a resonant
design which utilizes “zero-power”switching technology.
Benefits of resonant-switching include:
•Reduced power component stress for better reliability and
efficiency
•20dB lower noise than conventional switching supplies (and
therefore more EMC friendly)
•Behaves like a classic linear supply, but with the added
advantages of minimized size and weight reduction
Switching output stage
To maintain sonic quality along with incorporating the advan-
tages of a switching output stage, Crest Audio’s engineering
has two years of development time in this new generation
Class D amplifier. The multiple rail technology is the key to its
efficiency and low operating temperature. An additional
advantage to this design is the amount of power needed over
time. This amplifier will dramatically reduce the number of
kW/hr needed to operate.
Power Specifications 8Ωstereo 4Ωstereo 2Ωstereo 8Ωbridged 4Ωbridged
1kHz, 0.1% THD+N
ST2000 500w 1000w 1200w 1750w 2400w
ST1500 400w 750w 900w 1500w 1800w
ST1000 280w 500w 650w 1000w 1300w
(ST2000 model shown)

Preliminary Specifications ST Series Power Amplifiers
stereo power 8Ω
4Ω
2Ω
bridged mono power 8Ω
4Ω
maximum output voltage
frequency response 1W @ 8Ω
power bw rated power @ 4Ω, 1% THD+N
THD + N
smpte imd
damping factor
input CMRR
input sensitivity @ 8Ω
input impedance
hum and noise
crosstalk
class
power supply
circuit breaker rating (120V/230V)
current draw (120VAC) 1/8 power4Ω
1/3 power, 4Ω
at idle
thermal emissions 1/3 Power, 4Ωbtu / hr
cooling
input connectors
output connectors
controls
LED indicators
construction
dimensions
weight
ST1000 ST1500 ST2000
280W 400W 500W
500W 750W 1000W
650W 900W 1200W
1000W 1500W 2000W
1300W 1800W 2400W
53V rms 64V rms 72V rms
1kHz, 0.1% THD+N Power figures are watts per channel, both channels driven.
20Hz–20kHz, +0 / -1dB
20Hz–20kHz, +0 / -1dB
<0.05% rated power @ 4Ω, 1kHz
<0.03% rated power @ 8Ω
400:1 @ 8Ω
>60dB @ 1kHz
.775 V for full rated output power
>20kΩbalanced, >10kΩunbalanced
-100dB, A-weighted
> -60dB below max rated power (1kHz)
D
Resonant switching
10A / 6A 15A / 10A 20A / 12A
1.8A 2.4A 3.0A
4.0A 5.5A 7.0A
0.6A 0.6A 0.6A
1220 1430 2100
Back to front via variable speed DC fan
balanced female XLR, 1/4"TRS, and three pin Phoenix™
Speakon™connectors and five-way binding posts
front panel: twin recessed stepped attenuators, power switch
rear panel: signal ground-lift, mode select, circuit breaker
signal level, protect, active, ACL / IGM
16-gauge steel chassis, 14-gauge steel front-panel (double thickness in rack-ear areas)
3.5" x 19" (front panel) 17" (chassis) x 14”(15.25" to rack ears) hxwxd
22 lbs 22.5 lbs 23 lbs
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn NJ 07410 USA
TEL: [phone] FAX: [phone]
www.crestaudio.com
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
7/23/01
v.1.5
*A4400079*