
FRONT PANEL
INPUTS – The Shenandoah® Compak 300 is equipped with 2 types of input jacks. The ¼” input is unbalanced and “line level” with a usable sensitivity from 100 mV to 1.6 volt. The input impedance is 270 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, 12dB/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 usable sensitivity from
COMBINING XLR & ¼” INPUTS – A unique feature of the Shenandoah® Compak 300 is the ability to mix the XLR balanced and ¼” unbalanced inputs. In many situations, this effectively makes the amplifier function as a 3 chan- nel amplifier. The most effective way to use this feature is to set the volume on the channel using the XLR microphone input and then adjust 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.
INPUT O/L LED
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 acoustic output from the amplifier and can improve the playability of some instruments.