User manual PEAVEY M-300

[. . . ] WARNING: When using electrical products, basic cautions should always be followed, including the following: Do not use this apparatus near water. Do not block any of the ventilation openings. install in accordance with manufacturer's instructions. Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus (including amplifiers) that produce heat. [. . . ] If the heat sinks get too hot, a sensing circuit will activate the protective muting system to protect the amplifier. When the internal temperature reaches a safe level, the amplifier will automatically return to normal operation. It is important that both the front and rear of the unit have enough space to allow the cooling air to enter and escape. If the amp is rack mounted, do not use doors or covers on the front of the rack; the intake air must flow without resistance. If you are using racks with closed backs, make sure that there is one (1) standard rack space opening for every three mounted power amplifiers. If not rack-mounted, allow 6" of clearance on all sides. 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. Note: Always turn off and disconnect the amplifier from mains voltage before making audio connections. also , as an extra precaution , have the attenuators turned down during power-up. 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. (8) Channel A/B Output Selector (Low Z or 70 Volt) This slide switch allows channels A and B of this amp to be configured for either conventional Low Z or to a 70 Volt distribution loudspeaker system. (9) Channel C/D Output Selector (Low Z or 70 Volt) This slide switch allows channels C and D of this amp to be configured for either conventional Low Z or to a 70 Volt distribution loudspeaker system. The fan automatically switches to high-speed when the unit requires additional cooling. When the amplifier is relatively cool and at idle, the fan should operate at low speed. The fan should never stop unless the amplifier is switched off or the AC mains power source is interrupted. These modules should be selected by installation requirements. for details , refer to the individual MMA Module Operation Guide. Caution: MMA Plug-in Modules should not be inserted or removed while the amplifier is turned on. Normally balanced inputs are wired using two-conductor shielded cable as shown in the following diagram. For un-balanced (single-ended) inputs, the single conductor is wired to Pin 1; and the shield is connected to Pins 2 & 3 as shown in the following diagram. The output of each module may be assigned to any channel and in any combination of channels. [. . . ] ) Both channel level controls (in this example, A & B) MUST be used to control the signal level and both MUST be set at the same position. The input level controls are detented to match these settings precisely. note: Due to the unique input topology , the module ports CAN NOT be set up to drive the amplifier in Bridged Mode. The loudspeaker load is connected only to the designated positive (+) output terminals of the bridged channels. [. . . ]