Connecting Power
Professional Series power amplifier power requirements are rated at:
a)“idle”
b)1/8th power (“typical” music conditions)
c)1/3rd power (“continuous” music conditions) d.) maximum rated power.
Never try to hold the power switch in the “ON” position if it won’t stay there itself! Always turn off the amplifier before changing operating modes!
The maximum power current draw rating is limited only by the front panel circuit breaker. Consult the specifications in the Appendices section for figures on the current that each amplifier will demand. Make sure the mains voltage is correct and is the same as that printed on the rear of the amplifier. Damage caused by connecting the amplifier to improper AC voltage is not covered by any warranty. Unless otherwise specified when ordered, Crest amplifiers shipped to customers are configured as follows:
North America | - | 120VAC / 60Hz |
Europe | - | 230VAC / 50Hz |
Asia | - | 220VAC / 50Hz |
Australasia | - | 240VAC / 50Hz |
South America | - | 120VAC / 60Hz or 220VAC / 50Hz |
Japan | - | 100VAC / 50Hz |
NOTE: Always turn off and disconnect the amplifier from mains voltage before making audio connections. Also, as an extra precau- tion, have the attenuators turned down during
Operation Modes
Stereo Operation
For stereo (dual channel) operation, turn the amplifier off and set the mode select switch to the stereo position. In this mode, both chan- nels operate independently of each other, with their input attenuators controlling their respective levels. Thus, a signal at Channel A’s input produces an amplified signal at Channel A’s output, while a signal at Channel B’s input produces an amplified signal at Channel B’s output. For models 9001 and 10004, the recommended minimum nominal load impedance for stereo or parallel operation is 2Ω per channel. For model 10001, the minimum is 1 ohm per channel. Note: The Model 7301 has no mode select switch; it always operates as a
Parallel Operation
For parallel
Bridged Mono Operation
Both amplifier channels can be bridged together to make a very powerful
Unlike the stereo and parallel modes, in which one side of each output is at ground, in the bridged mode both sides are hot. Channel A’s side is in phase with the input. For proper operation, both input attenuators must be in the same position. This keeps the load bal- anced between the channel outputs. As in the parallel mode, only Channel A’s input is active. Note: The Model 7301 cannot operate in bridged mono mode; it always operates as a
Bridged Mono Operation - Model 10004
The Model 10004 power amplifier is configured so that one or both pairs of channels can be bridged to mono. Using the rear panel mode select switches, follow the same procedures as outlined above to bridge channels A&B together and/or C&D together.
Crest Audio Pro Series Power Amplifiers | Page 11 |