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00 NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. BEFORE USING THIS APPLIANCE. READ BACK COVER FOR FURTHER WARNINGS. L.A. 400L OPERATING GUIDE GENERAL DESCRIPTION The LA-400’“ produces 210 watts RMS system into a 4 ohm load and features many new ideas which our R & D program has designed to enhance the warmth and smooth operating characteristics normally found only with tube amplifiers. The LA-400™ also features our Gain Block'“ which consists of three controls; pre gain, Saturation'“ and post gain. This Gain Block'“ allows the player total control of the overall texture of harmonic content and overload characteristics by varying the amount of drive of the pre gain and the Saturation'“ control and finally, adjusting the post gain to the desired output level. The combination of the input dynamics, Saturation™ effect, and the extremely effective equalization circuit enables the LA-400™ to quite literally simulate almost any guitar sound available from any amp, old or new. This unit also features a second normal channel that is footswitch selectable and incorporates our unique automatic switching circuitry now being copied by so many of ourcompetitors. In addition to theabove, we have included our Black Widow®/Super Structure™ loudspeaker (#1203-4) whose characteristics have been carefully matched to complement the frequency response, power output, and damping factor of the LA-400's™ power amplifier. Since the LA-400™ is an extremely powerful single unit amplifier, we have included our patented DDT® compression circuit. As applied to this particular amp, the DDT® feature will allow the power amp to operate at optimum levels without distortion. When distortion is utilized within the Gain Block™, however, the DDT® circuit allows the preamp to generate the warm tube-like harmonics without the harshness created by the power amp. wm Z+ • POWER SWITCH (ON/OFF): The AC power switch is the conventional rocker type which indicates off at the bottom and on at the top. GROUND LIFT SWITCH: This switch is the three-position type with the center position completely removing the internal grounding capacitor from the circuit. This position is normally recommended for situations where the AC power recepticle is known to contain a properly grounded third wire. If properly grounded AC mains supply is not available, suitable ground lift adaptor should be used. The (+ and -) positions are used to ground the amplifier properly when only two-wire services are available. One of these positions will yield the lowest amount of residual hum or 'popping" when the instrument is touched. PILOT LED: The pilot LED indicates when the unit is receiving electrical supply from the mains and is operational MASTER REVERB CONTROL: The master reverb control determines the desired amount of reverberation from the internal reverb system Clockwise rotation increases the reverb effect and counterclockwise decreases the effect. ■ PRESENCE CONTROL: The presence is an active high frequency EQ with cut and boost capability. This control may be used similarly to a bright boost for the upper range of frequencies when additional bite is desired. ■ HIGH/PULL THICK: The high EQ control is similar in operation to a typical passive treble control and varies response of the high end at frequencies below the effect of the presence control. The pull switch on the high control activates the "thick" mid range boosted tonality which is very popular with rock players. Notice that the bass and mid controls have little effect when pull thick is activated. • MID SHIFT CONTROL: The vital mid frequencies are controlled by this unique concentric (stacked) system of potentiometers. Please be aware that mid frequencies contribute, to a large degree, to the overall tone color of the guitar in all forms of music. Although this is a new type of system for controlling themids. it should present no problem in operation. The inner (top) control determines the amount of mid frequencies. Rotating this control clockwise increases the mids for a greater degree of "fat" tonalities while counterclockwise rotation will cause the overall tone color to become "thin." The outer (bottom) control allows the player to "passively" shift the band at which the mid frequencies will operate. After experimenting with these controls, the player will be able to determine "where" and "how much" of the mid-range tonalities best suit his/her playing style and technique. • LOW FREQUENCY CONTROL: The low frequency control adjusts the tonality for the amount of smoothness and offers extended bandwidth on the low end of the tonal range. Care should be taken to not overboost with this control to avoid muddiness and premature overdriving of the power amp. Extreme overboosting of bass frequencies tends to distract from the projection capability of the amplifier and confuses material which should be heard for lead guitar lines ■ NORMAL GAIN CONTROL/PULL BRIGHT: The normal gain control determines the ...
Questo manuale è adatto anche per i modelli :Strumenti Musicali - L.A. 400 (1.56 mb)