Setting The Output Controls - Radial Engineering JDV Mk5 User Manual

®
True to the Music

seTTing The ouTPuT ConTRoLs

using the 180° polarity reverse
The JDV is equipped with a 180° polarity reverse that
toggles pin-2 and pin-3 on the XLR output. This func-
tion was originally intended to connect older vintage
equipment that did not employ the AES standard with
new gear.
This handy switch can also perform other various func-
tions. When used with an electric bass in a small venue,
reversing the polarity can be used to better align low
frequencies from the on-stage bass amp with the PA
system. When used with an acoustic instrument, it can be used to alleviate feedback without
reverting to dramatic EQ curves. When sound from the PA system, the on-stage amp, moni-
tors and the venue itself combine, huge frequency bumps that can cause resonant feedback
or phase cancellation will often occur. Reversing the polarity on the JDV can often move the
problem out of the way.
Lifting the ground and isolating the output
If you encounter hum or buzz, you can lift the ground on the XLR output by depressing
the ground lift switch. This is recessed in order to prevent accidental use when reaching in
behind the JDV. Use a small screwdriver to depress the switch.
You can also address noise problems by introducing an isolation transformer to the signal
path. The XLR output can be isolated via the rear panel switch, and the AUX output via the
side panel switch. It is good practice to employ a power bar to connect all of your amps, ef-
fects and the JDV so that they share the same electrical ground.
Try isolating the XLR fi rst, as this will disconnect the audio ground between the stage and
the PA or recording system. If you still hear hum, try reconnecting the XLR ground and then
isolating the AUX output. Ground problems can crop up for all kinds of reasons. Simply take
your time to try the various combinations until the noise goes away.
+20dB for direct recording
When recording direct, some players perfer to take the sound right off the JDV instead of
going through a mic preamp. Depress the +20dB switch to increase the JDV output from mic
level to line level.
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Radial Engineering Ltd. JDV™ Mk5 Active Direct Box