True to the Music
®
Radial Engineering Ltd.
JDX 500 Module
3
FUNCTION DETAILS
180º Reverse
This switch inverts the signal at the JDX output to align
the polarity with a microphone so they may be combined
at the mixing console without phase cancellation.
Lift
This ground lift switch works with the transformer isolation
to help eliminate hum and buzz caused by ground loops.
For the vast majority of amplifi ers this switch is set to the
inward position (ground lifted). However, some amplifi ers
may need to have the lift switch set to the outward
position (ground not lifted). Try both settings and use the
one that eliminates the most noise.
LPF Tone Shift
This variable low pass fi lter rolls off the high end to
tame the aggressive edge from overly bright sounding
amps. To engage the fi lter depress the LPF switch and
adjust the TONE SHIFT control for the best high-end
response.
LF-EXT
Or Low Frequency Extension, extends the frequency
response of the speaker emulation circuit downward
to emulate the sound of a 15” speaker for added bass.
When the LF-EXT switch is depressed the low frequency
cutoff shifts from 200Hz down to 100Hz.
Guitar
This recessed switch toggles the front panel 1/4” jacks
between “amp mode” and “guitar mode”. When “guitar
mode” is engaged this feature allows instruments to be
connected directly to the front panel 1/4” HEAD jack for
quiet recording without an amp. Engaging guitar mode
causes the LED to fl ash and changes the input sensitivity
of the ¼” HEAD jack to accept instrument level signals.
Do not connect a speaker-level signal to the 1/4”
HEAD jack when the GUITAR switch is engaged and
the LED is fl ashing.
300W
This recessed switch allows high power guitar and bass
amps (up to 300 watts) to be used with the JDX without
overloading the output stage. In the outward position the
sensitivity of the ¼” HEAD input jack is set for 100 watt
or less amps. When set to the inward position the input
sensitivity is reduced to accept 300 watt amps and the
LED indicator illuminates.
Outward position: amp mode
Inward position: guitar mode
(LED
fl
ashes)
