Genz-Benz shen 300lt ユーザーガイド

 - The Shenandoah 300-LT is equipped with two types of input jacks. The ¼” input is unbalanced and 

“line/instrument level” with a useable sensitivity from 50 mV to 1 volt. The input impedance is 150 k ohms. The ¼” input 

will also accept most active balanced line sources, automatically unbalancing them by recognizing the tip portion of 

the balanced signal.  If an instrument offers an unbalanced output it should be connected to the unbalanced input of 

the Shenandoah amp. Additionally, the precision input scaling preamp contains a 45 Hz, 12 dB/octave high pass filter 

(more effective and less intrusive than the more common 6 dB filters) 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 is not a line level input.  It contains a precision full range differential microphone preamp with 

phantom power. For use with higher-level sources (such as the balanced line level output from a keyboard or other 

instruments), a balanced pad network will be necessary to use the balanced input.  For instance, a Rapco “Pad Blox”, 

-20 or -30 pad or similar product could be used.

 - An internal phantom power source (13.6 volts) is provided for use with condenser mics. This 

power source is on at all times and does not affect the standard operation of the amp, even when a condenser mic 

is not used. We use the DIN 45-596-P12 volt standard, which will operate virtually all of the live sound reinforcement 

condenser microphones on the market. Some “boutique” externally biased condenser mics will not be compatible and 

will require 48 volt phantom power. Some suggested live sound condenser mics: AKG (C4500B, C4000B ,Elle C, C5), 

Audio Technica (AT3035, 3032, ATM 710), CAD (C195-P12), Shure (SM2-86, SM 48) and Crown (CM-200A, CM200-

ASW, CM-310A, CM-310ASW).

 – This level control sets the amount of gain at the input of the preamp.  Use this 

control to set the input level in conjunction with the overload LED indicator. 

 – The red overload 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 gain control.  

 – Each input 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.

 – Each input channel is provided with a pan control, which adjusts the balance of the input signal 

between the left and right output amplifiers. This control does not affect the assignment of the effects send signals.

 – A unique feature of the Shenandoah 300-LT 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.

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