Analog Control And I/O - Electro-Harmonix Forty-five thousand User's Reference Manual

Analog Control and I/O

SECTION A
LEFT and
Plug your instruments into these high impedance audio input
jacks. In mono mode, either input can be recorded onto any of
the 4 tracks. In Stereo Mode, the Left Input will record to either
Tracks 1 or 3, the Right Input will record to either Tracks 2 or 4.
The input impedance presented at each INPUT Jack is 1MΩ.
INPUT L and
Adjust the amplitude of the signal before it goes into the A/D
Converter. The L knob adjusts the signal level of the LEFT Input
and the R knob adjusts the level of the RIGHT Input. The INPUT
knobs should be adjusted to the point where maximum level
causes the CLIP LEDs to barely blink or not light up at all. The
trick to achieving the best quality digital audio is to record the
hottest possible signal without clipping the A/D converter. You
do not want to record a signal that is too low in volume or a
signal that clips very often (unless that is the sound you are
going for). When recording in mono, both the Left and Right
Inputs are summed together and recorded onto the active
track. To minimize hiss when recording in mono mode, it is
best to turn down all the way the unused Input knob.
CLIP L and
Light up when the audio signal clips the A/D Converter. In
other words, the CLIP LEDs light when the signal's amplitude
is greater than what the A/D Converter can properly handle.
The L LED lights when the LEFT Input clips, the R LED when the
RIGHT Input clips.
AUX IN Jack
This stereo input is mixed with the stereo output of the 45000
in the analog domain and is output through the LEFT and
9
RIGHT INPUT Jacks
R Knobs
R LEDs
L L L L INPUT INPUT INPUT INPUT R R R R
CLIP CLIP CLIP CLIP
DRY DRY DRY DRY
OUT OUT OUT OUT
NEW NEW NEW NEW
LOOP LOOP LOOP LOOP
RIGHT OUTPUT jacks, the Headphone and the MONITOR OUT
jacks. You could connect an mp3 player, mixer, drum machine
or any other device with a line output and mix it directly with
the 45000's loops. The 45000 does not record audio from
the AUX IN Jack. The Input Impedance presented at the AUX
IN Jack is 9.5 kΩ, so it is best suited for line outputs. You will
need to set the output volume on the AUX IN device to mix it
properly with the 45000 output.
LEFT and
These are the main outputs from the 45000. Connect these
outputs to your amplifier, mixer, computer, tape recorder
or any other suitable device. The Output Impedance at each
OUTPUT Jack is 400 Ohms. The LEFT and RIGHT OUTPUT jacks
contain the loop audio from all four main tracks, the Mixdown
track, the DRY OUT audio channel and audio from AUX IN. It
does not produce the CLIX LEVEL metronome beat nor is it
affected by the setting of the Headphone volume knob.
HEADPHONES OUTPUT
Plug your preferred headphones into the 1/4" Stereo
Headphones jack. Each channel of the HEADPHONES Output
jack can deliver 0.1W into 16 ohms. The HEADPHONES Output
jack contains the loop audio from all four main tracks, the
Mixdown track, the DRY OUT audio channel, audio from the
AUX IN jack and the CLIX LEVEL metronome beat. The volume of
the audio at this jack is set by the Headphones volume knob.
HEADPHONES VOLUME
The headphones knob adjusts the output volume for the
HEADPHONES output jack and the MONITOR OUT jack. The
HEADPHONES volume knob is an analog knob after the 45000's
D/A Converter, it has no bearing on the level of the recorded or
played back audio that is saved on the SD card. The signal at
the MONITOR OUT jack originates from the headphones ampli-
fier so you must turn up the HEADPHONES Volume knob in
order to hear audio come out of the MONITOR OUT jack.
A
RIGHT OUTPUT Jacks
Jack
Knob
B
C