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ATTENTION 24i USERS!
• Connecting unbalanced -10 dB inputs
• Volume control for the analog main outs
CONNECTING -10 dB INPUTS
The 24i has balanced +4 inputs. However,
these inputs also support unbalanced -10 dB
inputs from devices such as synthesizers,
samplers, drum machines, etc.
Adding 6 or 12 dB boost via software
The 24i driver has the ability to add 6 or 12
dB of gain to any input on the 24i (or any
other interface connected to the PCI-324
card). To boost an input in this manner:
1
Launch the Cue Mix Console software
(placed on your hard drive by the 24i
software installer).
2
Use the horizontal scroll bar in the mixer
to scroll to the desired input strip(s) as
shown below in Figure 1.
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If you have multiple MOTU audio
interfaces connected to your PCI-324 card,
the mixer shows the inputs of all connected
interfaces. Inputs for each interface are
identified by their labels across the top of the
mixer.
3
For each input, choose the desired level of
boost from the pop-up menu provided in
each strip as shown in Figure 1.
Dynamic range for boosted input signals
The inputs on the 24i provide a dynamic
range of 111 dB for a balanced signal. When
you boost an unbalanced input signal via the
software as just described, the dynamic
range is still close to 100 dB — well above the
dynamic range of most devices with
unbalanced -10 dB output.
Input labels (if multiple interfaces are present)
Figure 1: Boosting input level by 6 or 12 dB. This can be done
for any inputs on the 24i, as well as the inputs of any other
MOTU interfaces connected to your PCI-324 card.
A few things that are not affected by
software input boost
Boosting the input as just described has no
effect on direct input/ouput routing through
the PCI-324 card (by choosing inputs from
Input Source
the
window). Also it has no effect on the level
meters on the front panel of the 24i; instead,
the level meters continue to display the
original strength of the input signal.
menus in the 324 Console
VOLUME CONTROL FOR THE 24i’s
MAIN ANALOG OUTS
From the factory, the main analog outputs of
the 24i ship with a fixed output level that
matches the 24i’s digital S/PDIF outputs.
There is, however, a jumper inside the 24i
that allows you to change the front panel
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headphone volume knob curcuit so that it
also controls the volume of the 24i’s main
analog outputs. This lets you control the
volume of the 24i’s main analog outputs
directly from the front panel volume knob.
To m ake thi s simpl e mo difi cat ion to y our 24i ,
follow this procedure:
1
Obtain a standard phillips head
screwdriver.
2
Switch off and unplug the 24i.
Failure to do so may result in serious
☛
shock or injury.
3
Remove the screws found on the left-hand
and right-hand sides of the 24i’s metal
chassis.
4
Carefully lift the cover off the 24i, pulling
it towards the rear of the unit as you lift to
avoid damaging any of the connectors on the
rear of the circuit board.
7
Before touching the jumper, touch the
metal face-plate of the 24i to discharge any
static electricity that may have built up since
you last handled the unit.
Figure 3: The volume knob jumper.
8
As directed by the instructions on the
circuit board, move the jumper to the right
so that it straddles the center and right-hand
columns of pins.
5
Locate the volume knob jumper as shown
below in Figure 2.
Figure 2: The volume knob jumper is located near the
headphone knob.
6
Position the 24i so that you can read the
jumper instructions printed on the circuit
board as shown in Figure 3. The rear panel of
the 24i should be facing you; the front panel
should be facing away.
©1999 Mark of the Unicorn, Inc.
BEFORE AFTER
Figure 4: Moving the jumper to the right.
9
Place the cover back on the 24i, paying
careful attention to the connectors on the
rear panel to make sure that they fit through
each hole.
Make sure that none of the connectors
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are jammed against the metal cover; they
should extend comfortably through their
respective holes.
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Before you reattach the screws, test the
volume knob by running some audio
through the main outs.
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