Crest Audio Crest CLh Serie Manual Del Proprietário página 24

Rear Panel cont.
REMOTE AND SEQUENTIAL POWER CONNECTORS
5
The CLh™ Series comes standard with remote-controllable sequential turn on enabled by setting the front
power switch to ENABLE. The amplifier is activated by applying a voltage between 12 to 24 volts DC to the
rear-mounted, 4-pin plugable terminal, and connecting the ENABLE terminal to the 12-24 VDC+ terminal.
When no voltage is present or the ENABLE connection is opened, the amplifier will switch off. Other CLh Se-
ries amplifiers can be "daisy chained" by connecting all 12-24 VDC+ terminals together, all ground terminals
together , and connecting the ENABLE OUT to the ENABLE IN of the next amplifier. A mating connec-
tor is shipped with the amplifier.
SPEAKER CONNECTORS
6
SPEAKER OUTPUT CONNECTIONS
Speakers are connected using the output barrier strip connector. Spade lugs, ring tongues or bare wire may be
connected to the output barrier strip elements. The barrier strip can accommodate up to two 10 gauge wires
per terminal. Make sure the amplifier is turned off before you change any output connections or jumpers.
Consult the Wire Gauge Chart to find a suitable wire gauge to minimize losses of power in the speaker cables.
Connect each loudspeaker load to its own channel of the amplifier as shown on the chassis. Do not connect
the output terminals together. Refer to the specification sheet for the correct allowable load impedances. Use
proper speaker wire and class 2 wiring.
These CLh amplifiers contain a unique balanced speaker output. Do not connect the minus (-) terminals to-
gether or to any ground terminal. These terminals contain half of the speaker output and must be connected
only to their respective speaker load.
SIGNAL LEVEL ATTENUATORS
7
Whenever possible, set the attenuators fully clockwise to maintain optimum system headroom. The input
attenuator controls, (one for channel A, one for channel B), adjust gain for their respective amplifier channels
in all modes. See the specifications at the end of this manual for standard voltage gain and input sensitivity
information.
HIGH-PASS FILTER ENABLE
8
When set to the in position, the channel has a 18dB per octave roll off of frequencies below 70Hz. Activate the
filter when using 70V or 100V loudspeaker transformers. This will help prevent transformer and amplifier
overload. The filter will also limit subsonic signals to the loudspeaker, making more power available for the
intended frequency range.
SIGNAL INPUT AND PATCH CONNECTORS
9
Both channels have a balanced terminal block input. Balanced connections are preferred in most applications
to reduce radiated noise that may be induced into the input cables. Short cables may be used in an unbalanced
configuration. If unbalanced is necessary, connect the shield to ground as well as to the - terminal with a
jumper wire. Additional terminals are provided for patching to a second amplifier. If a balanced input is used,
the patch must also be balanced.
For mono applications, patch the channels together via this connector. Do this when driving two speakers
with one input signal. This will retain separate control of both channels' gain and filtering. Do not connect the
output terminals together.