CPS-2T
Commercial Stereo
Power Amplifier
General Product Description
The Electro-Voice CPS-2T amplifier is a very high-quality power
amplifier designed to elicit excellent performance from any speaker
system as well as 25V, 70.7V and 100V lines. Its low distortion and
substantial headroom ensure that program material will be accurately
amplified.
Each channel of the CPS-2T delivers more than 330-watts
continuous average power into 8 ohms and 600 watts into 4 ohms.
In its transformer-isolated dual mode, it can deliver more than 580
watts into 25, 70.7 or 100-volt lines. In the bridged mode at 1 kHz,
the amplifier can deliver more than 1,200 watts into 8 ohms at less
than 1% THD. Both direct and transformer-isolated outputs may be
used simultaneously. The power supply with its large toroidal
transformer gives the amplifier impressive headroom and
current-output.
The CPS-2T contains 20 high-power output devices with 5,000 watts
of dissipation capability. These devices are protected from
overheating by two, three-speed temperature-sensitive fans. The
fans are quiet enough to permit use of the CPS-2T in noise-sensitive
applications such as recording studios and houses of worship.
The CPS-2T has sophisticated protection circuits that guard it and
the load from problems. Protection circuits guard against overload,
over-temperature, shorted outputs, radio-frequency interference and
dc faults. The output devices are protected against damage from
the reverse feeding of electrical energy (back EMF) from the load
and are switched on via relays to avoid transients which could
damage speakers. There is also a Transformer Saturation Protection
(TSP) circuit that monitors the current demands of the transformer
and can activate the limiters when the input signal r20
dBu at any frequency.
The CPS-2T has built-in limiters to protect speakers from the
deleterious effects of amplifier clipping. The limiter’s action is
controlled by very sophisticated input/output comparators which are
designed to preserve the sonic integrity of the source.
The CPS-2T has electronically-balanced XLR type and removable
Phoenix Contact “Euro-style” input connectors in parallel that allow
easy, problem-free connections and signal routing. The amplifier
has an input routing switch that allows selection of either normal
dual-channel operation or parallel mono operation, which routes an
input to both channels but still allows independent level control.
Optional input transformers may be added to the amplifier to provide
for even greater immunity from interference.
The CPS-2T Phoenix Contact “Euro-style” removable output
connectors provide sturdy, reliable connections and allow use of
heavy wire for loss-free signal transmission. There are easily
identifiable connections for the direct outputs and for the
transformer-isolated 25, 70.7 and 100-volt outputs which may be
used simultaneously.
To prevent ground loops from occurring, the CPS-2T is equipped
with a ground-lift switch. When the amplifier is operated in a rack
with units of different ground potential, the switch may be adjusted
to eliminate hum.
Separate dB-scaled potentiometers on the rear panel of the CPS-2T
allow easy regulation of gain. There is easily readable nomenclature
to ensure repeatable control settings.
The Electro-Voice CPS-2T is an excellent choice for high-quality
professional sound system applications which require excellent
sound quality, speaker protection and the highest level of
construction quality and long-term reliability.
Architects’ and Engineers’ Specifications
The power amplifier shall be a dual-channel model of solid-state
design employing high-power output devices capable of driving
normal speakers and 25 – 100 volt lines. It shall be capable of
operating from a 120/230/240-V, 50/60 Hz ac line. The power
amplifier shall meet many worldwide product safety requirements
including Underwriter’s Laboratories UL-813 standard, Canadian
Standards and CE standards.
The power amplifier shall contain a limiter circuit driven by a
high-quality input/output comparator to protect the load from damage
by amplifier clipping. The amplifier shall contain sensing circuitry to
provide protection for the output transistors against over temperature,
excessive output voltage, shorted loads, excessive phase shift and
back-EMF current. The load shall be similarly protected against
start-up/shutdown transients, low ac line voltage and dc.
Rear-mounted controls shall include detented dB-scaled level
potentiometers for each channel, an input routing switch for selecting
dual/stereo or parallel mono operation, a switch for selecting dual/
stereo or bridged operation and a chassis ground-lift switch.
Rear-mounted input connectors shall include a 3-pin female
XLR-type connector wired in parallel with a male 3-pin XLR-type
output connector for signal routing. Output connector shall be a
“Euro-style” Phoenix Contact 12-pin #KGS-MSTB2.5/12 connector.
Front-panel indicators shall include power on, a protection indicator
and separate signal present and limiter indicators for each channel.
Front-panel controls shall include a power on switch.
The power amplifier shall meet the following performance
specifications: rated output power from 20-20,000 Hz at less than
0.2% THD, each channel 330 watts into 8 ohms, 600 watts into 4
ohms as well as 25, 70 or 100 volt lines; In bridged mode at 1 kHz,
the amplifier shall deliver 1,200 watts into 8 ohms; THD (total
harmonic distortion) shall be less than 0.05% at 1 kHz at rated
output power at 8 and 4 ohms, 0.1% at 100 volts, 0.2% at 70 volts
and 03% at 25 volts; transient intermodulation distortion (DIM 30),
shall be less than 0.03% at 8 and 4 ohms, 0.1% at 100 volts, 0.3%
at 70 volts and 0.5% at 25 volts. Dimensions shall be 132.5 mm
(5.25 in) high x 483 mm (19.0 in) width x 385.5 mm (15.7 in) deep.
Net weight shall be 22.5 kg (49.6 lb). Color shall be light gray.
The power amplifier shall be the Electro-Voice CPS-2T.
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