Genz-Benz shen 150lt ユーザーガイド

 – 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. 

 – 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.  

 – 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.

 – 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.

 – 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-

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.