Acoustic Preamp operating instructions
Contents
1. Acoustic Preamp operating instructions CE MONITOR Di OUTPUT OUTPUT LEVEL LEVEL AC GND Q O bs FIRST Set Monitor and DI Output levels fully anti clockwise 0 output Connect the supplied power adapter plug to the 12V AC input socket By inserting and twisting 90 clockwise the plug will lock in position To remove twist the plug 90 anti clockwise For connection to recording desk or PA system plug a standard XLR microphone lead into the DI output socket For connection to stage monitor amplifier use a standard guitar lead from the monitor output to the amp input 7 BASS TREBLE HEAT LEVEL ae ot n 0 a gt 5 ma i f 7 QO C4 1i50Hz KHZ 2 INPUT MID CONTROL PATCH Connect the guitar output lead to the input socket www dennismarshall co uk EFFECTS FX PATCH AND PROGRAMME PROG CONTROLS Effects patches are selectable by rotating the FX PATCH switch to the desired number and the parameter of the selected patch can be edited by rotating the PROG control The depth of effect can be set by using the FX LEVEL control 1 HallReverbi Reverb Decay Time Chorus gt Delay gt Room Delay Time 4 HallReverb2 Reverb Decay Time 6 Room Reverb3 Reverb Decay Time Reverb Decay Time 8 Nonlinear Reverb _ Reverb Decay Time 9 Chorus Chorus Depth __ a me mm t aa _ me _ a Reverb Decay Time Delay ___ Delay Time Reverb Decay Time Reverb Decay T2. ime The HEAT control varies the current flowing through the valve and when increased will add warmth and definition to the guitar tone This control is very effective in defining mid range frequencies www dennismarshall co uk TONE CONTROLS The tone controls are divided into three bands bass treble and parametric mid The bass control works at 100Hz the treble control works at 10KHz The mid control is parametric and works between 150Hz 3KHz as shown below Ni pen pmo All tone controls are either boost or cut with the 12 o clock position no effect www dennismarshall co uk OUTPUT LEVELS The DI Output Level is Line Level The PA desk input should be padded to reduce any floor noise The Monitor Output is also Line Level and the monitor amplifier input level should be set as low as possible The Ground Lift control will counter any ground loop interference SPECIFICATIONS Power Input Source 12V AC ONLY Input impedance 50KOhms Output impedance DI 600 Ohms Output impedance Monitor 10KOhms Bass Control 14dB 100Hz Treble Control 14dB 10KHz Mid Control 14dB 150 3KHz The complete unit measures 150 x 100 x 50 mm and weighs approx 1 kilo The power supply plugs directly into a normal wall mains socket Power consumption is 6VA The Preamp comes loaded with a JJ Gold pin ECC83S valve and the solid state circuitry uses OP amps that are of the highest audio quali
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