grace design m801
mk2
owner’s manual
4
Front Panel Controls
C
D
E
F
A
B
A
24 POSITION GOLD CONTACT GAIN SWITCH
Each gain control has 24 positions and adjusts
the voltage gain from 18dB to 64dB in 2dB steps.
For reference, the 9 o’clock position is 28dB, the
12 o’clock position is 40dB, and the 3 o’clock
position is 52dB.
B
BI-COLOR LED PEAK INDICATOR
The LED peak indicator, which monitors the
output signal, turns green at -14dB and switches
to red at +16dB (12dB before clipping). The
threshold level for peak indication is adjustable
on each channel (see page 8).
C
48V PHANTOM POWER SWITCH
The phantom power switch (l48V)
connects the +48V power supply to pins 2
and 3 on the XLR input connector. This switch
illuminates red. It should be noted that the LED
in this switch actually monitors the voltage at
the input. With no microphone connected, the
LED will continue to illuminate for approximately
10 seconds after the phantom power is turned
off as the filter capacitors discharge. As well,
even if the phantom power is switched off, the
LED will illuminate if voltage is being fed from an
external source (i.e. when using a direct split in a
remote recording application).
D
PHASE REVERSAL SWITCH
The phase reverse switch reverses the absolute
polarity of the music signal at the input of the
preamplifier. The switch illuminates green and
provides power for a sealed gold contact relay
located on the preamplifier circuit board. This
eliminates signal wiring to the front panel and
switch contact performance problems.
E
-20 PAD SWITCH
The 20dB attenuator switch attenuates the input
signal 20dB. The switch illuminates amber when
engaged. Like the phase reverse switch, this
switch controls a sealed gold contact relay on the
preamplifier circuit board. With the -20 switch
engaged, the effective gain range becomes -2dB
to 44dB.
F
RIBBON MIC MODE SWITCH
This switch activates a 10dB increase in overall
preamplifier gain while simultaneously disabling
the 48V phantom power circuit to protect
ribbon microphones. As well, the input coupling
capacitors are bypassed and input impedance is
increased to 20k Ohms.
