Manley MONO & DUAL MONO TUBE DIRECT INTERFACE MODELS - Manual (Page 5)

FRONT PANEL
A B C D E F
BASS FULL
BASS MEDIUM
GUITAR / SYNTH
GUITAR MEDIUM
GUITAR BRIGHT
POWER ON
O F F
IN ST R U MEN T
I N P U T
LIFT
G R O U N D
CONSOLE
BOOST
U N I T Y
A GROUND LIFT Disconnects chassis earth from Pin 1 on the XLR console output.
If at first it hums - switch this. In general, if there is an amp involved then the best
place to start is in the "LIFT" position.
B GAIN SELECT Selects low or high gain feeding the XLR "OUT TO CONSOLE".
Both labels "CONSOLE BOOST" and "UNITY" need explanation. "UNITY" refers
to power conversion similar to the way a good transformer works. The voltage is
lower and the current is stronger but the power stays the same. The voltage loss is 23
dB and in a good range for all console mic preamps to handle well. "CONSOLE
BOOST" mode adds 17 dB of voltage gain over "UNITY". The voltage loss is about
6 dB. This is a good setting when the instrument has a low output or when feeding
several consoles in a live setting due to losses in splitters.
C INSTRUMENT INPUT Standard 1/4 inch phono high impedance instrument input.
Input impedance is 1 meg ohm. This is not a "speaker" style input.
D INPUT SELECT Selects between five types of 6 dB per octave low frequency roll-
off: BASS FULL is the closest to a "flat setting". BASS FULL = 12 Hz / -3 dB,
BASS MED = 42 Hz, GUITAR/SYNTH = 100 Hz, GUITAR MED = 250 Hz,
GUITAR BRIGHT = 550 Hz. All settings have a gentle roll-off on the highs (15 kHz
-3 dB) to avoid some of the harshness of typical DI's and to better approximate a
clean amp-like sound. Do not feel that these basic labels will be the best for your
application. Use your ears and taste and go for the "feel" first.
E POWER SWITCH Switch up to turn on the power, down to turn the power off.
F POWER LED Illuminates when the preamplifier is powered up.
The Dual Mono Tube direct shares the same features as the mono unit only it
has two of everything....