Peavey PA 120 User's Manual
Contents
1. PA 120 The new PA 120 is a compact portable sound rein forcement MIXER AMPLIFIER featuring a rugged 100 Watt power stage This compact but powerful unit is capable of handling most any club or lounge perfor mance as well as the smaller concerts Because of the super heavy duty silicon output devices and the large aluminum heat sink the PA 120 has the extra measure of durability required for demanding commercial applications The PA 120 is a four channel mixer amplifier with the capability of handling up to four microphones or instruments because of its extremely wide dynamic range Each channel of the 120 features separate volume bass treble and reverb controls to enable the operator to control each microphone or instrument s tone and response characteristics The master section of the PA 120 provides overall volume and main reverb controls for added flexibility These master controls enable the operator to more fully control the output in order to create a more balanced sound The reverb effect is controllable from the optional remote footswitch 1 The volume control serves to vary the gain of the preamp The preamps of the new 120 PA are of the variable feedback type which allow lowest noise and maximum performance 2 The reverb control is used to vary the amount of reverb signal from the individual channels The con tinuously variable control allows the operator to mix in any amount of reverb desired The reverb signa2. how much of the delayed reverb signal is blended back into the master mixer The master reverb is a return level control and must be turned up before any reverb effect is heard at the output The master reverb level should be set so that the individual reverb send controls on each of the channels have adequate control variation 7 The master volume control controls the gain of the master mixer by use of variable negative feedback The use of active mixing allows your 120 PA Mix er Amplifier to perform as well as many studio mixing consoles This method is the same used on the latest recording mixers and yields the lowest distortion and noise than any other method The master volume sets the level for the entire system The master volume should be set approximately in the middle position 4 6 and fine adjustment in volume should be made with the individual controls on each channel 8 The reverb footswitch jack provides a method for reverb cut off by use of the optional remote footswitch Any footswitch with the proper plug stan dard phone plug and a shielded cable will work with this jack 9 The pilot light indicates when power is applied to the amplifier 10 The three wire line cord has been provided for your protection and should be connected to the proper line voltage as indicated on the back panel DO NOT REMOVE GROUND PIN ON PLUG 11 The fuse is located within the cap of the fuse holder and should be replaced with one of
3. e setting and normal operation will be restored when the unit reaches safe operating temperatures If thermal shutdown is apparent then you are overloading the system and continued use in this manner will damage the system Never use less than a 4 ohm total load on the 120 module The output voltage available from this unit is approximately 22 VRMS into 8 ohms with proper line input 14 The large line cord retainers on the rear panel are provided for your convenience in storing the AC line cord during transport of the unit
4. l is mix ed into the delay line by rotating the reverb control clockwise until adequate reverb is obtained Remember that the master reverb control must be turned up before individual reverb takes effect 3 The bass control determines the low frequency response of the individual channel The 120 PA bass control is a type of electronic crossover which acts as a volume control for the low frequencies Because of the design of this control it is possible to obtain both bass boost and cut The vertical position between 5 and 6 will yield a flat response Clockwise operation results in a boost and counter clockwise operation results in a cut 4 The treble control determines the high frequency response of the individual channel The treble control is part of an electronic crossover and functions as a volume control for the high frequencies The vertical position between 5 and 6 yields flat response while clockwise settings boost highs and counter clockwise settings yields a treble cut 5 The input jacks are designed to accept a high impedance microphone or instrument MASTER SECTION Field experience has proven that a professional PA mix er amplifier must be equipped with a full set of master controls While the bass treble and reverb controls enable good tonal mix in the individual channels it is difficult to obtain a good overall balance unless the master controls are present 6 The master reverb is the control that determines
5. the proper value if it should fail It is necessary that the proper value fuse be used to avoid damage to the equipment and to avoid voiding the warranty Models that have circuit breakers can be reset by depressing the red button If the breaker trips repeatedly take the unit to a qualified service center for inspection 12 The line power switch is of the three position type with the center position being off The three posi tion switch has two on positions which are used to ground the amplifier properly One of the on positions will yield the least hum or popping when the microphone is touched and this is the position that should be used 13 The speaker output jacks are designed to be used with a total load of FOUR OHMS Speaker systems of higher impedance can be used with a slight loss in output power Speaker systems with less than a total of four ohms can be used with the risk of overloading the power amplifier Slightly less power will be delivered to lower impedances because of the uni que limiting action of our integral protection system The power amplifier is built on a large aluminum heatsink to cool the output devices A thermostat is connected to this heatsink to shut the system down in case of overheating Low speaker impedances tend to cause the amp to run hotter than normal and could cause the automatic cutoff to operate if the output stage becomes hot enough to endanger the output devices The ther mostat is self r
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