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Inputs
Input Section:
The JD7 has two inputs allowing a second
guitar to be used without having to
reconnect instruments. Input clipping is
monitored with a red LED indicator. Under
normal use, a typical electric guitar should
not cause the LED to illuminate. If you have
a very high input level and it does
illuminate, either turn down the level or
reconnect using input-2. This input is
outfitted with a switchable 8dB pad.
Input-2
is dual function. It is used for a
second guitar and to access the rear XLR
female input jack. This is a switching jack
with front panel priority. When the front
1/4" input jack is used (has a jack
connected), it becomes active. When it is
not used, the rear XLR female input jack
becomes active when the selector is
depressed. See the 'Balanced Low-Z output
and input' section in thismanual for details
on using these features.
Drag Control:
™
Drag control is a simple yet extremely musical function that allows you to simulate the way your guitar
reactswhenconnected directly to your amplifier.
After many months of listening tests, we found that the particular sound of a guitar is in fact made up of the way the
amplifier's input section 'sees' or loads down the guitar. This effect
and
is compounded by the guitar cable used. For instance, a low output single coil pick-up has less 'drive voltage'
than a humbucking pick-up and is therefore more prone to these effects, while active guitars and basses (and
keyboards) will be virtually unaffected.
Drag control lets you 'dial-in' the natural relationship between your guitar and amplifiers with a simple, yet very
musical one dial interface.
To start, set the Drag control to 12 o'clock, which is about normal for a PAF humbucker. A Strat to a Twin sounds
'normal' at about 10 o'clock. To add Drag for a darker sound, turn counter-clockwise. For less Drag, turn the knob
the other way. Once you have found the sound that best matches your set-up, leave the control where it is. There is
no 'plastic' finger knob on the JD7 as Drag will normally not be used once you have your set-up dialed in. You will
find that the JD7 will quickly become a centerpiece in your studio and you will be using it all the time. We made the
Drag control hard to adjust so that it will not be changed inadvertently.
This is not to say that you cannot use Drag control. In fact, the more you play with it, the more you will hear the
subtleties that make the function both unique and musical. Opening up the Drag (clockwise) will give your sound
more 'air' while going counterclockwise will darken the tone. Use your ears!
A note about grounding:
Since guitar circuits are high-gain and high impedance, RF noise, hum and buzz are easily induced. Connecting
equipment with different grounding schemes often results in ground loops and more noise. The Radial JD7 addresses
these problems by employing a floating ground architecture which requires an earth ground. This is accomplished via
the Channel-1 output. Channel-1 provides an electrical ground from the JD7 chassis to the primary guitar amplifier,
therefore
always connect Channel-1 to a guitar amp with a 3-prong grounded A/C power cord
ground and keep noise out. If a Channel-1 connection is not desired, another ground path is necessary to minimize
noise. This can be achieved by grounding chassis to chassis using a ground lug and wire attached to (eg.) one of the
chassis assembly screws.
'Drag' cont rol
8dB pad for Input-2
Overload LED indica tor
Input selec tor swit ch
Primary guit ar input
JD7 Instrument inputs, Channel-1 & Channel-2 outputs.
depends greatly on the type of guitar pick-ups
Channel-1 on-off swit ch
Channel-1 on/off indica tor
Channel-1 output
Direc t coupled
Second ins trument input
to enable a proper
3
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