User manual CREST AUDIO CPA

[. . . ] PROFESSIONAL POWER AMPLIFIERS -6 -10 -15 -30 -80 0 dB -1 -3 ACL Signal -6 -10 -15 -3 CP A -1 Protect Active -30 -80 0 dB 1 800 Ch A Cinema Power Amplifier Ch B -6 -10 -15 -30 -80 0 dB -1 -3 ACL Signal -6 -10 -15 -3 CP A -1 Protect Active -30 -80 0 dB 1 200 Ch A Cinema Power Amplifier Ch B -6 -10 -15 -30 -80 -1 0 dB -3 ACL Signal Protect Active Cinema Power Amplifier -6 -10 -15 -30 -80 -1 0 dB -3 CP A 900 Ch A Ch B -6 -10 -15 -30 -80 -1 0 dB -3 ACL Signal Protect Active Cinema Power Amplifier -6 -10 -15 -30 -80 -1 0 dB -3 CP A 600 Ch A Ch B -6 -10 -15 -30 -80 -1 0 dB -3 ACL Signal Protect Active Cinema Power Amplifier -6 -10 -15 -30 -80 -1 0 dB -3 CP A 400 Ch A Ch B OWNER' S MANUAL Important Precautions This symbol is used to alert the operator to follow important operating procedures and precautions detailed in documentation. This symbol is used to warn operators that uninsulated "dangerous voltages" are present within the equipment enclosure that may pose a risk of electric shock. 10. Power down and disconnect units from mains voltage before making connections. Never hold a power switch in the "ON" position if it won't stay there itself! [. . . ] The fan speed increases only as required by heat sink temperatures, keeping fan noise to a minimum. Under extreme thermal load, the fans will force a very large volume of air through the heat sinks. If either heat sink surpasses the maximum allowed temperature, the sensing circuit will open the output relay, disconnecting the load from that channel. If the power transformer overheats, another sensing circuit opens both channel output relays until the transformer cools to a safe temperature. IMPORTANT: To ensure optimum cooling, periodically clean the amplifier fan filters (removable without tools). Also make certain that there is enough space around the front of the amplifier to allow the cooling air to escape. If the amplifier is rack-mounted, do not use doors or covers on the front of the rack; the exhaust air must flow out without resistance. If the amplifiers are to be housed in racks with closed backs, allow at least one (1) standard rack space of opening in the front of the rack for every four amplifiers. Crest Audio CPA Series Power Amplifiers Models CPA400, CPA600, CPA900, CPA1200, CPA1800 Page 9 Connecting Inputs. Use either the XLR or 1/4-inch input connectors on the rear to supply audio signals to your Crest Audio CPA Series amplifier. (The CPA Series amplifiers are configured standard with "Pin 2 hot" on XLR inputs. Please note that some other Crest Audio amplifiers are configured with "Pin 3 hot"). The unused connector can be used to jumper the audio input to another amplifier input. For more information, see the sections on Balanced 1/4" (TRS) & XLR Input Connectors, Input XLR Polarity, and Input Sensitivity. Speakers are connected using 5-way Output Binding Posts or Speakon connectors, depending on version supplied. Please note that on the 5-way Output Binding Post version of the CPA1800, two pairs of 5-way binding posts are provided for each channel, so that paralleling of speakers is possible. For more information, see the Output Connectors and Mode Selection sections. Page 10 Crest Audio CPA Series Power Amplifiers Models CPA400, CPA600, CPA900, CPA1200, CPA1800 Mode Selection. The three-position, recessed Mode Select switch (located on the rear panel) configures the amplifier for either Stereo, Parallel or Bridged Mono Mode. In Stereo Mode, both channels operate independently, with their input attenuators controlling their respective levels. Signal at Channel A's input produces output at Channel A's output, while signal at Channel B's input produces output at Channel B's output. Recommended minimum nominal load impedance for stereo operation is 4 ohms per channel. When set to Parallel Mode, a signal applied to Channel A's input will be amplified and appear at outputs for both Channels A & B. Either the 1/4" (TRS) input or the XLR input on Channel A may be used. Bridged Mono Mode straps both amplifier channels together to make a very powerful, single-channel monaural amplifier. [. . . ] User Responsibility Your CPA Series amplifier is very powerful and can be potentially dangerous to loudspeakers and operators alike. It is your responsibility to read the section titled "Important Precautions" and make sure that the amplifier is installed, wired, and operated properly as instructed in this manual. Many loudspeakers can be easily damaged or destroyed by overpowering, especially with the high power available from a bridged amplifier. Read the section on Speaker Protection and always be aware of the speaker's continuous and peak power capabilities. [. . . ]