Millennia TD-1 Twin Topology Half Rack Recording Channel User Manual
Page 9
TD-
Twin Direct
1
a speaker cabinet. Note that the power amplifier must be plugged into
speakers designed for the full power rating of the amplifier whenever the
power amplifier is feeding the TWIN DIRECT. A typical application would
be taking a parallel feed from a guitar amplifier or speaker cabinet during
live or studio performance. Power amplifier output should be wired in
“parallel” with speakers and the TWIN DIRECT’s Instrument Input jack.
TWIN DIRECT will not effect the sound or performance of the power am-
plifier or speakers. TWIN DIRECT will accept power amplifier input when
this switch is depressed and illuminated. Insert a power amplifier into
the TWIN DIRECT only when this switch is depressed and illuminated.
Failure to do so could result in serious damage.
Wonderfully rich and spacious electric guitar recordings can be achieved
by using a pair of microphones on a guitar speaker cabinet, along with a
direct feed into TD-1’s Speaker Soak input — with all three signals mixed
together. Try using a pair of sonically dissimilar microphones, such as a
Royer 121 and Josephson 606 (two of our favorites). Place each mic in a
different position to maximize its unique strengths. One trick to maximize
tonal “fullness” is to focus your ears on the “hum” and “hiss” of an idle
guitar amp speaker, then position mics to maximize the depth and pres-
ence of that hum and hiss.
GAIN CONTROL
A potentiometer offering up to 65 dB of gain for the mic input and 45 dB
for instrument and line .
— FRONT PANEL: EQUALIZER SECTION —
PARAMETRIC EQ BAND IN/OUT Pushbutton Switch “IN”
A switch (2 ea) which places its associated Eq band in circuit or out of
circuit. There are two bands of fully parametric equalization on the TD-1.
Frequency bands are labeled LF [20 Hz - 2.5 kHz] and HF [250 Hz - 25
kHz]. An Eq band is in circuit when its associated band switch and main
Eq on/off switch (below) are depressed and LEDs are illuminated. Be-
cause of the equalizer’s unique network-shunt design, Eq bands should
have no detectable sonic signature when they are in circuit as long as the
boost/cut control is set at zero. Band In/Out switches are provided both
for comparing a single Eq band setting versus flat-band response, and for
bypassing the Eq band entirely.
PARAMETRIC EQ BOOST/CUT CONTROL
Conductive plastic rotary potentiometer (2 ea) offering up to 15 dB of
+48V PHANTOM POWER Pushbutton Switch
A switch which provides phantom power (+48 Volts DC) to the micro-
phone. When this switch is depressed (illuminated red), phantom power
is applied simultaneously through dual 6.81k ohm resistors to pins 2
and 3 of the rear panel three pin female XLR mic input connector. Use
phantom power with condenser and other microphones requiring tradi-
tional phantom supply. Do not use phantom with ribbons, moving coil,
and other microphones which do not require phantom power. Use care,
as well, not to insert or extract mic cables from the TD-1 when phantom
power is active. This could damage both microphone and the sensitive
HV-3 front end.
INPUT GROUND LIFT / ISOLATE Pushbutton Switch
A switch which removes the ¼” Instrument (DI) Input ground from TWIN
DIRECT’s internal audio grounding. This switch also employs an internal
jumper which selects true ground lift, or ground “isolation” via resistive
and capacitive coupling (See Jumper Map). When jumper is installed and
this switch is depressed, ground is isolated via series resistance. When
jumper is not installed (factory default), and switch is depressed, ground
is lifted. A momentary pop may occur when lifting grounds – you may wish
to remove power from the TWIN DIRECT when experimenting with any
ground lifting technique.
Note that Input Ground Lift / Isolate should only be used in cases
where a ground loop cannot be corrected by first lifting earth or output
grounds. Lifting earth ground from power ground will usually correct
ground loops and hum problems. Of course, for safety, never defeat the
earth/chassis power cord ground bond. Always assure that the “third pin”
(earth ground) on the IEC power cord remains connected to the TWIN
DIRECT’s IEC input connector. If you must lift earth ground, you may do
this via the rear panel switch. (See “Earth Ground / Isolate Lift” switch
and “Output Ground Lift” switch, below.)
POLARITY REVERSE Pushbutton Switch
A switch which reverses polarity of the TD-1 signal path immediately after
the gain adjustment amplifier. See Signal Flow Diagram for detail. Polar-
ity on main outputs is flipped 180 degrees with respect to the input when
this switch is depressed and illuminated.
SPEAKER SOAK
tm
INPUT Pushbutton Switch
A switch which allows the Instrument DI / Speaker Soak Input (above) to
accept signal directly from the output of a power amplifier connected to