User manual CREST AUDIO CC

[. . . ] Intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. WARNING:To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture. Before using this appliance, read the operating guide for further warnings. WARNING: When using electrical products, basic cautions should always be followed, including the following: Do not use this apparatus near water. [. . . ] If the amp is rack mounted, do not use doors or covers on the front of the rack; the exhaust air must flow without resistance. If you are using racks with closed backs, use fans on the rear rack panel to pressurize the rack and ensure an ample air supply. Make certain that there is enough space around the front and rear of the amplifier to allow the heated air to escape. Suggestion: In racks with closed backs allow at least one standard-rack-space opening for every four amps. 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. Although the CC Series amplifiers have AUTORAMPTM circuitry, which raises the signal level gradually after the output relay closes, it is always a good idea to have the gain controls turned down during power-up to prevent speaker damage if there is a high signal level at the inputs. Whether you buy or make them, use good-quality connections, input cables and speaker cables, along with good soldering technique, to ensure trouble-free operation. Consult the Wire Gauge Charts to determine proper gauges for different load impedances and cable lengths. Remember that cable resistance robs amplifier power in two ways: power lost directly to resistance (I2R loss), and by increasing the impedance of the load presented to the amplifier, thereby decreasing the power demanded of the amplifier. Always turn off and disconnect the amplifier from mains voltage before making audio connections. Also, as an extra precaution, turn the attenuators down during power-up. The input overload point is high enough to accept the maximum output level of virtually any signal source. Cables can be connected with banana plugs, spade lugs, or bare wire to the five-way binding posts. Hazardous energy may be present in the enclosure when the power switch is in the off position. If the switch shuts off during normal use, push it back to the ON position once. For parallel (dual-channel/single input) operation, turn the amplifier off and set the mode switch in the parallel position; both amplifier channels are then driven by the signal at channel A's input. Channel A's and channel B's input connectors are strapped together to allow patching to another amplifier. Both input attenuators remain active, allowing you to set different levels for each channel. Power and other general performance specifications are the same as in the stereo mode. Both amplifier channels can be bridged together to make a very powerful single-channel monaural amplifier. Use extreme caution when operating in the bridged mode; potentially lethal voltage may be present at the output terminals. [. . . ] Some poor quality fuses have a significant series resistance that could degrade the amplifier's damping of the speaker's motion and may even deteriorate the system's sound quality. If you elect to use fuses, check with the speaker manufacturer to determine the proper current rating and time lag required. Do not drive any low-frequency speaker enclosure with frequencies lower than its own tuned frequency. The reduced acoustical damping could cause a ported speaker to bottom out even at moderate power. [. . . ]