JCF Audio Latte User Manual - Front Panel Controls
Front Panel Controls
The numerous front panel controls are arranged to be as user friendly as possible. DMT functions are towards the
left side of the front panel and the A/D functions are towards the right.
L Lev, R Lev
- This is the attenuator between the preamp and line amp blocks in the DMT section of the device. It
will affect the output level of the BAL outputs and AUX outputs (in high level mode) This control should also be used
as a vernier adjustment between the pad values when using the device as a mic pre. The fully clock wise position
provides no attenuation and the fully counter-clockwise position provides approximately 13 db of attenuation.
D/A Locked
- This LED indicates that the input signal from either the AES 1 jack or the TOSLINK input is valid
depending on which signal is selected from the D/A input switch. This LED does NOT indicate anything about the
status of the AES 2 signal.
L Pad, R Pad
- These switches attenuate the signal coming in from the MIC/TAPE jacks on the rear. 0 (no attenua-
tion), -10db, -20db, -30db are selectable. When using the devices as Tape machine electronics both of these switches
should be set to 0 or no attenuation. The pads have no effect when using the DMT section as a D/A; however there
will be the residual resistive load of the pad on the mic line regardless of whether or not the signal is used.
L Pol, R Pol
- The switches change the polarity of the signal from the MIC/Tape jacks on the rear. They have no
effect when using the DMT section as a D/A.
L Phan, R Phan
- These switches engage a common mode voltage of approx. 37vdc on the “MIC/TAPE” input
jacks for purposes of phantom powering condenser microphones. (the source resistance of the phantom power has
been adjusted to give a comparable amount of power to microphones designed to work from 48 volts)
Phantom should not be engaged when using this section as TAPE machine electronics. No harm will come to the
connected tape head provided the cables are wired properly, but it is a very poor idea to allow a voltage near your
tapes in this manner.
MIC / D/A
- This switch decides whether the D/A or the MIC / Tape circuit (mic/tape input, pad, phantom, polar-
ity) feeds the DMT section of the unit.
A/D Offset L,R
- A multi-turn trimmer controls the amount of DC offset in the A/D circuit which is accessible
with a "tweaker" or small screwdriver through the front of the unit. A digital meter with enough resolution should be
connected to the LATTE AES output in order to adjust this control properly. This control should not be adjusted un-
less the unit has been on for at least an hour and has temperature stabilized.
A/D Lev
- A multi-turn trimmer controls the amount of signal input to the A/D circuit. This control is accessible
with a "tweaker" or small screwdriver through the front of the unit. This "pot" will fully attenuate the input signal if
adjusted to do so. Fully clockwise will adjust the the unit such that a +4 dBu signal at the line input will yield ~-10.5
dBFS digital level (with the line input configured as it is in shipping).
A/D input
- Also referred to as “Cascade”. This switch controls the input signal to the A/D section. In line the line
input will feed the A/D attenuator. In -> mode, the output of the DMT section will feed the A/D input. Care must
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