FRONT PANEL
INPUTS
– The Shenandoah™ Acoustic 150LT is equipped with 2 types of input jacks. The ¼” input is unbalanced
and “line level” with a useable sensitivity from 100 mV to 1 volt. The input impedance is 150 k ohms. The ¼” input will
also accept most active balanced line sources, Additionally, the precision input scaling preamp contains a 50 Hz, 12
dB/octave high pass filter and an “RFI” filter (radio frequency interference) to eliminate unwanted noise. The XLR input
jack is balanced and “microphone level”, with a useable sensitivity from –60dBv to –30 dBv. It contains a precision full
range differential microphone preamp with phantom power.
INPUT CLIP LED
– The Red Clip LED senses the input signal to the preamp section and warns of input
overload. For the cleanest signal possible this LED should only flash with the strongest signal peaks. Adjust this
sensitivity with the input volume control and master volume.
COMBINING XLR & ¼” INPUTS
– A unique feature of the Shenandoah™ Acoustic 15LT is the ability to mix the
XLR balanced and ¼” unbalanced inputs on each channel. In many situations, this effectively makes the
amplifier function as a 4 channel amplifier. The most effective way to use this feature is to set the volume on the
channel using the XLR microphone input and then adjusting the level control on the instrument itself (assuming that it
has one) to blend levels between the 2 inputs. Equalization will be common to both inputs on the channel.
PHASE SWITCH
– Each channel is provided with a phase reverse switch. By reversing the phase of the input
signal, feedback tendencies can be reduced if caused by sympathetic vibrations between the speaker and the
instrument. Under some conditions, changing the phase can drastically improve the output from the amplifier and can
improve the playability of some instruments.
ON-BOARD STUDIO QUALITY DIGITAL EFFECTS
– The Shenandoah™ 150LT contains a studio
quality 24-bit, 15 program digital effects processor. We chose to use an industry leader in digital processing for realis
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tic, high quality effects algorithms. Level differences are normal when switching between different effects; just adjust
the channel send and master level controls accordingly. The effects level control on each channel adjusts the send
level to the digital effects processor. The digital effects level in the master section controls the effects return level from
the processor. In general - Turning up the channel effects send will yield lusher effects response. Running the channel
effects send lower and the master level higher will yield softer effects response.
