Peavey CS 1800G User Manual
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2
CSTM
1800G FEATURES
l
19” rack-mountable design requiring
l
Automatic two-speed
l
Separate power transformers/circuit breakers for
l
Independent channel thermal/fault protection
l
DDTTM activation
l
Calibrated/detented input attenuator controls, each channel
l
Two
recessed
balanced input transformer
dual fan
LED
cooling
and power
two rack spaces
system
LED, each
channel
sockets
each
for
PL-2’s
channel
l Single
l
XLR input can
l
Dual phone plug and 5way binding
l
Rear panel
Peavey Electronics is proud to announce the introduction of a new line of exciting Professional Power Amplifiers. The new CS-G series is the result of years of research & development into a smaller, lighter, compact and more
powerful amplifier. These units operate much more efficiently than contemporary power amp designs, requiring less
current from the mains power plug, producing far less heating. This new technology allows the
produce more than 1800 W RMS into 4 ohms (Bridge Mode) in a two rack space unit, at extremely low distortion
levels.
These new designs use a new class of operation called “Class BG”. This class uses two levels of power supply
“rails,” but switches between the rails faster and at lower distortion levels than does a typical Class G design. This unit
then combines higher efficiency and lower distortion, and together with our all new Non-saturating Series Single
Emitter Resistor topology (NSSER), provides awesome performance levels with full power 20 kHz distortion below
0.04%, and with slew rates greater than 40
U.S. Patent (Pending).
The following is the new CS 1800G specs:
600 W RMS into 4 ohms; 900 W RMS into 2 ohms, per channel
1200 W RMS into 8 ohms; 1800 W RMS into 4 ohms (Bridge mode)
Slew Rate: 40 V/microsecond, stereo mode, each channel
Frequency Response: 20 Hz to 20 kHz, f0.2 dB, at rated power
Total Harmonic Distortion: Less than 0.04%, at rated power
Hum and Noise: 100 dB below rated power, unweighted
The unit is attractively packaged in a rugged, rack-mountable configuration requiring only two rack spaces.
Naturally it has Peavey’s patented DDTTM Compression Circuitry, and has a very flexible back panel. The design uses
dual two speed fan cooling to provide all the cooling necessary for the two ohm load conditions.
XLR and dual phone plug inputs,
be
transformer balanced
post
TM
DDT
defeat, mode select,
V/@ec.
This technology is called “Dynamic Logic” and is covered by a
each
channel
outputs,
each
channel
and ground lift switches
CS’rM 1800G
to reliably
FRONT PANEL FEATURES:
CHANNELS A & B
INPUT SENSITIVITY (1)
The maximum input gain (minimum sensitivity rating) is achieved at the full clockwise setting, which yields the
maximum mixer/system headroom. A setting of less than full clockwise will yield lower system noise at the expense of
mixer/system headroom. Calibration indicates sensitivity in dBV necessary to attain the full available rated output
power.
POWER LED (2)
Illuminates when AC power is being supplied to the amp, and the associated channel is operational. If either channel
were to experience fault conditions or to exceed the safe operating temperature limits, then that channel would shut
down, and the associated power LED would cease to illuminate, indicating such conditions exist. Also, whenever the
Bridge mode is selected, the power LED of channel B is defeated (off), just as if there were a fault condition on
channel B. This provides a positive indication that the CS
1800G
is configured for bridge mode.
A
DDTTM
Illuminates when DDT Compression is taking place in that channel. With the ENABLE/DEFEAT switch in the DEFEAT position, this LED indicates when clipping distortion is occurring in that channel.
CIRCUIT BREAKERS (4)
The CS
associated power transformer for each channel, and thereby offer protection from overheating and possible destruction
due to fault conditions in the amplifier. The breaker trip current value has been carefully chosen to allow continuous
power output performance, yet still provide adequate protection for the power transformer. Normally, these breakers
should not trip unless there is a fault in the amp circuitry that draws excessive mains current. However, abnormal
conditions, such as a short circuit on either or both channels or continuous operation at overload or clipping, especially
into 2 ohm load, will cause the breaker to trip. If this occurs, turn the power switch off, then simply reset the breaker
and correct the cause of the overload.
When tripped, the button on the breaker will be outward nearly
button length is about
waiting a brief period of time to allow it to cool down. REMEMBER, ALWAYS TURN THE POWER OFF BEFORE
RESETTING THE BREAKER. If the breaker trips instantly each time you attempt to reset it, the unit should be taken
to a qualified service center for repair.
POWER SWITCH (5)
Depress to
ACTIVE LED (3)
1800G
uses circuit breakers in place of main fuses. These breakers are provided to limit the current to the
l/2”
and can be reset by pushing inward. A normal reset
l/4”.
If this “thermal” type breaker does trip, simply pushing the button back in will reset it, after
“I”
position to turn on.
4
Back Panel:
BACK PANEL FEATURES:
MAINS POWER SOURCE (6) 120 V products only
The CS
large ground pin. It should be connected to an independent mains circuit capable of supporting at least I.5 amps continuously or greater. This is particularly critical for sustained high power operation. If the socket used
a ground pin, a suitable ground lift adaptor should be used and the third wire grounded properly. Never break off the
ground pin on the CS
use a three-wire type with at least a #14 AWG wire size. The use of lighter wire will severely limit the power capability
of this amplifier. Always use a qualified electrician to install any necessary electrical equipment. To prevent the risk of
shock or fire hazard, always be sure that the amp is properly grounded.
18OOG
is fitted with a single heavy-duty #14 AWG
1800G
power amplifier. The use of extension cords should be avoided, but if necessary, always
3-conductor
line cord and a conventional AC plug with a
dots
not have
GROUND LIFT SWITCH (7)
This switch is used to disconnect the CS
Chassis ground is the chassis itself, which is electrically grounded through the rack mounting screws to the external
rack system and through the mains line cord via the large ground pin to the mains ground. It is often advantageous to
“lift” the signal ground from chassis ground to eliminate a “ground loop” which has caused unwanted ground current in
the signal cables between the external preamp and this power amplifier. Such conditions can create excessive hum
levels in the power amplifier output and render the system useless in low level applications. In this case, “lifting” the
ground should solve this hum problem. Ground lift is selected when the switch is in the right or “LIFT” position. If
lifting the ground does not eliminate a particular hum problen!. then we recommend you defeat the ground lift feature.
NOTE: Using this ground lift feature still leaves the chassis itself grounded electrically through the mains line cord.
Having the chassis grounded avoids any possibility of an electrical shock or a fire hazard. This ground lift feature
should never be confused with the practice of “floating” the large ground pin at the AC mains receptacle to eliminate a
ground loop. Floating the ground pin on any electrical equipment is just asking for trouble! !
SPEAKER OUTPUTS (8)
A
Two each
are in parallel, hence the speaker connection cables can be terminated with l/4” phone plugs, banana
plugs, or stripped wires for use in the binding post terminals. For sustained high power applications,
the use of the binding post terminals are recommended; however, care must be exercised to assure
correct speaker phasing. Regardless of what connections are used, the typical parallel speaker load
should always be limited to 2 ohms per channel or 4 ohms Bridge mode for any application.
Operation at loads of 4 ohms per channel or 8 ohms Bridge mode is more desirable for sustained
operation applications due to the fact that the amplifier will run much cooler at this load. Operation
above 4 ohms per channel, and even open circuit conditions can always be considered safe; however,
any sustained operation at loads below 2 ohms could result in temporary channel shut down due to the
thermal limits and/or the amp fault circuits.
l/4”
jacks and
1800G’s
“signal ground” (both input and output) from the “chassis ground.”
!
5way
binding post speaker output terminals are provided. All these outputs
5
LOW-Z INPUT (9)
A conventional 3-pin, female XLR input jack is provided and may be used as the channel input. When the (PL-2) line
balancing transformer is not used, this XLR input becomes Quasi-Balanced with pin #3 as the positive input (connecting to the tip of the l/4” input jacks above), pin #2 as the negative input (connecting to the floating sleeve of the l/4”
input jacks above), and pin #l going to the internal power amplifier ground. When the (PL-2) line balancing transformer is used, this XLR input becomes fully Transformer-Balanced (Pin #3 positive, pin #2 negative, pin #I ground).
(See the PL-2 SELECTOR SWITCH section (next) for details on related settings.)
PL-2 SELECTOR SWITCH (10)
This switch is used in conjunction with the PL-2 transformer to allow the LOW-Z INPUT to function with or without a
PL-2 module being inserted in the receptacle. The “out” position of this switch selects the Quasi-Balanced mode of
operation for the LOW-Z INPUT (XLR jack), and routes the input signal directly to the HI-Z INPUT jacks. In this
position the HI-Z INPUT jacks may be used as outputs after the LOW-Z INPUT to allow patching this signal to another
input on this amp. Normally, in this switch position, a (PL-2) transformer is not present (“out”) in the transformer
receptacle; however, if one were “in” the receptacle, the LOW-Z INPUT would still be Quasi-Balanced. It becomes
fully Transformer-Balanced only when the “in”
“test” for the necessity of a line-balancing transformer. The “in” position of the switch routes the signals from the XLR
jack through the (PL-2) line-balancing transformer, thereby selecting the Transformer-Balanced mode of operation for
the LOW-Z INPUT. In this position the HI-Z INPUT jacks may be used as outputs after the line balancing transformer
to patch the signal to another input jack on this amplifier or other amps/equipment. If the “in” position is selected
without a (PL-2) line-balancing transformer “in” the receptacle, the LOW-Z INPUT will be rendered inoperable.
TRANSFORMER RECEPTACLE (11)
This receptacle only receives the optional (PL-2) line-balancing transformer. When conditions exist that demand the
usage of a Transformer-Balanced XLR Input for either or both channels, then the (PL-2) transformer must be put here,
and the selector switch must be in the “in” position.
switch position is selected. Notice this is a very effective means to
MODE SWITCH (12)
This switch is used to select either Stereo or Bridge mode operation. When BRIDGE mode is selected, the channel B
LED power indicator will go out indicating Bridge mode has been selected. Accidental selection of this mode could
damage loudspeakers. Bridge mode will be covered in more detail later in this manual.
HIGH-Z INPUT JACKS (13)
Two parallel (bridged) input jacks are provided for each channel. This allows for one to be used as a conventional
input, and at the same time the other to be used as a “line out” (Y-cord) to connect to another input jack on this amplifier or other amps/equipment. These
Quasi-Balanced input capability due to a unique “ground loop” elimination circuitry associated with the inputs. This
feature will normally allow “hum free” operation when relatively short
various jacks on this amp and other jacks on various other equipment that share the same rack with this amplifier. This
Quasi-Balanced capability is automatic and cannot be
DDTTM
This switch is used to either ENABLE or DEFEAT the DDT compressor. The DDT function will be covered in more
detail later in this manual.
COMPRESSION SWITCH (14)
l/4”
jacks are not “chassis grounded” and when used will provide a
l/4”
cable patches are made between the
removed
from the system’s circuitry.
6
INSTALLATION AND CONNECTION
The Peavey CS 1800G commercial series power amplifier is designed for durability in commercial installations and the
quality of performance required in studio and home applications. The unit is a standard rack-mount configuration,
3-l/2”
high and is cooled by automatic two-speed internal fans. All of the input and output connections are on the back
panel. The front panel contains LED indicators for power and DDT activation,
detented/calibrated
sensitivity controls,
and a mains power switch.
INDUSTRIAL AND COMMERCIAL INSTALLATIONS
For commercial and other installations, where sustained high power operation is required, the CS 1
mounted in a standard
19”
rack. It is not necessary to leave rack space between each amplifier in the stack, since the fan
SOOG
should be
pulls air in from the rear and exhausts the hot air out of the front. However, an adequate COOL air supply must be
provided for the amplifier when rack-mounted. The internal fan must have a source of air that is not preheated by other
equipment. The amplifier will start up in “Low Speed” fan operation, and will normally stay at low speed operation
unless sustained high power operating levels occur. Then as the amplifier’s “Heat Sinks” heat up, the automatic thermal
sensing circuitry will cause high speed operation to occur. Depending on signal conditions and amp loading, high speed
fan operation may continue or it may cycle continuously between high and low. This situation is quite normal.
If cooling is inadequate due to preheated air, or a reduction of air flow occurs due to blockage of the amplifier inlet/
outlet ports, or if the amplifier is severely overloaded or short circuited, then the amplifier thermal sensing system may
cause temporary shutdown of that particular channel. This is indicated by the channel power LED on the front panel
ceasing to illuminate. Depending on available cooling air, operation should be restored in that channel relatively
quickly, and the power LED will be illuminated. In any event, corrective action should be taken to determine the cause
of the thermal shutdown. If the amplifier is not severely overloaded or shorted, and air flow is normal in and out of the
unit, then steps should be taken to provide a cooler environment for all the amplifiers. As a general rule, the cooler
electronic equipment is operated, the longer its useful service life.
BRIDGE MODE
The bridge mode on stereo amplifiers is often misunderstood as to the actual operation and usage. In basic terms, when
a two channel amplifier is operated in the Bridge mode, it is converted into a single channel unit with a Power Rating
equal to the sum of both channel’s power ratings, and at a Load Rating of twice that of the single channel rating. In this
case, the CS
1800G
is rated at 900 W RMS per channel into 2 ohms. Thus, the Bridge Rating is 1800 W RMS into
4 ohms (minimum load). Bridge mode operation is accomplished by placing the mode switch in the “BRIDGE”
position, connecting the load between the RED binding posts of each channel, and using channel A as the input channel. All the channel B functions as an input are defeated and they serve no purpose in Bridge mode.
A popular application for Bridge mode operation is to drive sound distribution systems in large public address applications. In this mode, the CS 1800G power amplifier can actually drive 70 volt systems directly without using expensive
matching transformers. The real advantage of such an approach is primarily cost.
70 volt distribution systems are very common in applications where rather large numbers of relatively small loudspeakers are used for background music and paging. Such systems require the use of 70 volt transformers at each loudspeaker. Another common use for the Bridge mode is in subwoofer applications where very high power levels are
required to adequately reproduce the extreme low frequencies. Such enclosures usually contain 2 or 4 loudspeakers to
handle the power levels involved. For Bridge mode usage, the enclosure impedance must be 4 or 8 ohms; never below
4 ohms! Also make sure that the enclosure can handle 1800 watts reliably.
7
DDTTM
Peavey’s patented
speaker combination by preventing the power amp from running out of headroom (clipping). This compression system
is activated by a very unique circuit that senses signal conditions that might overload the amplifier and activates
compression (reduces the amp gain) when clipping is imminent. Threshold of compression, then, is clipping itself and
no specific threshold control is used. This technique effectively utilizes every precious watt available for the power
amplifier to reproduce the signal while at the same time minimizes clipping and distortion, and thus significantly
reduces the potential of loudspeaker degradation and damage. The DDT system is an automatic, hands-off approach to
the problem of power amplifier clipping. Since the CS
protection, the DDT compression system plays even a more important roll in continuous performance by preventing
each channel from clipping and overloading. Continuous operation at clipping can cause the circuit breaker to trip, but
with the DDT activated, this problem is minimized. For this reason you should always have the DDT compression
system enabled.
COMPRESSION
DDTrM
compression system enables the sound man to maximize the performance of the amplifier/
1800G
power amplifier uses circuit breakers for the over-current
8
SPECIFICATIONS
Output Power: (typical value)
(@
120 VAC, 60
Hz)
Stereo mode, both channels driven:
2 ohms, 1 kHz, 1% THD: 900 W RMS per channel
4 ohms, I kHz, 1% THD: 600 W RMS per channel
8 ohms, 1 kHz, 1% THD: 350 W RMS per channel
Bridge mode. mono:
4 ohms, 1 kHz, 1% THD: 1800 W RMS
8 ohms, 1 kHz, 1% THD: 1200 W RMS
Rated Output Power:
(@
120 VAC, 60 Hz)
Stereo mode, both channels driven:
4 ohms, 20 Hz to 20 kHz, 0.04% THD: 550 W RMS
per channel
8 ohms, 20 Hz to 20 kHz, 0.04% THD: 300 W RMS
per channel
Power Bandwidth: (typical value)
Stereo mode, both channels driven
@
rated power, 4 ohms, ~0.1% THD: 10 Hz to 40 kHz
Slew Rate: (typical value)
Stereo mode, each channel: 40 volts per
Bridge mode, mono: 80 volts per
pSec
ySec
Total Harmonic Distortion: (typical)
Stereo mode, both channels driven:
20 Hz to 20 kHz, 4 ohm rated load: Less than 0.04%
Input Sensitivity & Impedance:
Input attenuator set @ FCW:
@
rated output power, 4 ohms: 1 .O V RMS (0 dBV),
20 k ohms
(+33
dB)
Frequency Response: (typical value)
Stereo mode, both channels driven:
+0,-l
dB, 1 W RMS, 4 ohms: IO Hz to 40 kHz
+O,
-0.2 dB @ rated output, 4 ohms: 20 Hz to 20 kHz
Damping Factor: (typical value)
Stereo mode, 8 ohms, I kHz: Greater than 300
Hum & Noise:
Stereo mode, below rated power, 4 ohms: 100 dB,
unweighted
Power Consumption:
Stereo mode, both channels driven:
@
rated output power, 4 ohms: 13 A @ 120 V AC,
6.8 A
@
230 V AC
Cooling System:
Dual 2 speed fans
DDTTM
Compression System:
Switchable with LED
Dimensions & Weight:
Height: 3.50” (8.9 cm)
Width:
19”
(48.3 cm)
Depth 17” (43.2 cm)
Weight 35 lbs. (15.9 kg)
Two Rack Space, Class BG, Dual Rail Design With
NSSER Topology
(NSSER: non-saturating series single emitter resistor)
Patent Pending.
Due to our efforts
,features and specifications listed herein are subject to change without notice.
for
constant improvements,
9
CSTM 1800G
r
Flow Diagram
10
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