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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 lter
(more effective and less intrusive than the more common 6 dB lters) and an “RFI” lter (radio frequency interference)
to eliminate unwanted noise. The XLR input jack is balanced and “microphone level”, with a usable 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.
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 amplier function as a 3 chan-
nel amplier. 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 –This red O/L LED senses the input signal to the preamp section and warns of input overload.
For the cleanest signal possible, this LED should only ash with the strongest signal peaks. Adjust this sensitivity with
the volume control of your instrument and the Shenandoah
®
Compak 300’s channel volume. Adjust the nal overall
volume with the amps master volume.
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 amplier
and can improve the playability of some instruments.
ON-BOARD STUDIO QUALITY DIGITAL EFFECTS – The Shenandoah
®
Compak 300 contains a studio
quality 24-bit, 15 program digital effects processor. Using pro audio industry digital processing hardware, we have
achieved realistic, high quality effects algorithms. Level differences are normal when switching between different ef-
fects; 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 more lush effects.
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