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Two-Channel Power Amp: The Cerwin-Vega CV-900 Power Amp is rated at
210W x 2ch at 8ohm, 320W x 2ch in 4ohm, and 420W x 2ch in 2ohm. The power
amplifier can also be bridged for a rating of 650W x 1ch in 8ohm or 845W x 1ch
in 4ohm. The two-channel power amp provides Stereo, Parallel, or Bridged Mono
operating modes for flexible application.
- Stereo: In stereo mode, both channels operate independently with
individual input gain controls. Signal at channel 1's input produces output
at channel 1, while signal at channel 2's input produces output at channel
2's output. Recommended minimum nominal load impedance for stereo operation
is 2 ohms per channel.
- Parallel: When set to Parallel mode, a signal applied to channel
1's input will be amplified and appear at outputs for both channel 1 & 2.
The parallel mode is well suited for applications in which driving two
speakers with the same signal but with separate amplification. The "Channel
1" and "Channel 2" input gain controls individually control the out put
level on channels 1 and 2.
- Bridged Mono: Bridged mono mode straps both amplifier channels
together to make a very powerful, single-channel monaural amplifier. One
channel "pushes" and the other channel "pulls" equally, doubling the power
over that of either channel alone. Therefore the voltage is doubled, the
peak power is quadrupled, and program power is roughly three times as high
as that of the individual channel. Signal is applied to the channel 1 input
only and channel 1 input gain control is used to adjust signal level. The
input gain control belonging to channel 2 are not used. Bridged mono mode is
to be used only when the CV-Series amp is connected to a 4 or 8 ohms speaker
Combo Input Connectors: Connect your input source to the amplifier's
balanced combo connectors using either XLR or 1/4" TRS plugs. They are
configured as follows; Pin 2 (Tip) hot, Pin 3 (Ring) cold, and Pin 1 (Sleeve)
ground. We recommend using balanced three-conductor cabling wherever possible.
Unbalanced two-conductor 1/4" plugs can also be inserted into these inputs, but
you will get better signal quality and less noise and hum if you use balanced
lines. Stereo signal should be connected to the Channel 1 and Channel 2 input
jacks. When operating the unit in Bridged Mono or Parallel modes, use the
Channel 1 input jack only.
Binding Post and Speakon Outputs: Binding posts are provided for
each channel, as well as Speakon connectors so that paralleling of speakers is
- Binding Post: Connection to the binding posts can be made with
bare wire, banana plugs, or spade lug terminations. Make connections to both
the Channel 1 and Channel 2 terminals for Stereo or Parallel Mode, or a
single connection across the red terminals only of Channel 1 and Channel 2
for Bridged Mono Mode.
- Speakon Connector: You can use these to connect each channel of
the unit to 8 ohms or 4 ohms loudspeakers. Using Speakon speaker cables,
connections to both the channel 1 and channel 2 connectors for Stereo or
Parallel Mode, or to the Bridged mode connector for Bridged Mono Mode.
Link Connectors: These XLR jacks (one for each channel) are used to
send a parallel signal to another device or amplifier.
Controls: The CV-Series power amp offers a variety of
controls to fit your application.
- Bridge/Stereo/Parallel Switch: This rear-panel switch changes the
amplifier operating mode between stereo, mono bridged, and parallel.
- Channel Input Level: These two 21-position detented
potentiometers adjust input level for their respective amplifier channels.
In Bridged Mono Mode, only channel 1 level control is used to adjust signal
level. In Parallel Mode, both input level control are used to adjust signal
level for their respective amplifier channels. At their fully
counter-clockwise position, the signal is attenuated by more than 80dB. At
their fully clockwise position, the signal is at maximum gain. When 0 dBu of
signal arrives at the input jacks and the Channel input level controls are
set to their fully clockwise position, the unit delivers full power output.
- High Pass Filter: These two switches are used to activate the
built-in High Pass Filter for each channel. The HPF rolls off signals below
40Hz. This improves bass performance by limiting sub-audio cone motion,
making more power available for the speaker's rated frequency range. When
the filter is turned off, a 5 Hz roll off protects against DC or deep
- Limiter Switch: When the input signal connected to your amplifier
is too high, you end up with a distorted output signal. To prevent this,
both channels feature a clip limiter that can be engaged or disengaged
Protection Circuitry: The CV-Series power amp incorporates the
following protection features to protect the amplifier and your speakers from
damage or failure.
- Initial Power Up: For
approximately five seconds after initial power-up, the protection circuitry
is activated and the speaker outputs are muted. If everything is operating
normally, you will hear an audible click at the conclusion of this brief
period, as the protection circuitry is deactivated and the unit begins
delivering signal to the connected speakers. It is normal for the Protection
LED to fade gradually after the amplifier is powered off.
- Thermal Protection:
Abnormally high heat sink temperatures will engage the protection circuitry
for the overheating channel only. An output relay disconnects the speakers
until normal temperature range is restored. The Protect indicator will light
to show the protection circuit is active. To guard against this problem,
make sure the unit receives adequate ventilation on all sides and that both
the front and rear panels are unobstructed. If the power transformer gets
too hot, its thermal switch will disconnect all of the secondary power and
disconnect both channel outputs.
- Short Circuit: If
output is shorted due to faulty wiring, the thermal circuitry will
automatically protect the amplifier. If this occurs, the load will be
disconnected by the thermal protection circuitry.
- DC Voltage Protection:
If an amplifier channel detects DC voltage at the speaker output, the output
relay will immediately open to prevent speaker damage.
- Subsonic Filter: The
built-in High Pass Filter provides subsonic frequency protection for each
- Current Limiting: At
the amplifier's full power limit, or clipping point, the limiter circuitry
will be activated. This is indicated by illumination of the Clip LED. The
channel gain is automatically reduced, protecting the speakers from high
power. Uncontrolled feedback, oscillations, or improper equipment gain
setting may activate this circuitry, which is virtually transparent in
operation as full signal bandwidth is maintained.
LED Indicators: Front panel LEDs indicate power, clip, protect, and
- Active: These blue LED's indicate that AC power is connected and
the amplifier is turned.
- Signal: These blue LED's will illuminate to indicate that a
signal is present at the amplifier input, and that the signal is being
- Clip: These red LED's will illuminate at the clipping threshold.
These lights should not light up during normal use as they indicate signal
outside of the amplification range of the amplifier. When a signal is
"clipped" and the clip indicator illuminates, it means that the signal is
being distorted at the output stage. Prolonged clipping can not only damage
your amplifier, but also your speakers, so be careful to monitor the clip
indicator during setup and use. If the clip indicator is illuminated then
simply lower the channel gain or input signal until the indicator does not
- Protection: These red LED's indicate that the channel is in
Protect mode. When the channel goes into protect mode all output for that
channel will be muted. The protect LED's light when overheating or other
severe problems occur. This is to protect any speakers connected to the
channel. The LED's also light for approximately five seconds whenever the
unit is powered on and fade slowly when the amplifier is powered off.
Flow-Through Cooling: The CV-Series power amplifier is
cooled by a
rear-mounted fan. Cool air flows through the front fan filter, reducing the
temperature of internal components while forcing the heat out the rear vent.
Never block the vent and keep it clear at all time.
Rack Mountable: The CV-Series power amplifier can be mounted in any
standard 19" rack thanks to its integrated rack mount ears.