Millennia Media will repair this product, free of charge, in the USA, in the
event of defect of materials or workmanship for one (1) year following
date of purchase. This warranty is extended only to the original purchaser. This limited warranty covers failures due only to defects in
materials and workmanship that occur during normal, intended use and
does not cover damage which occurs in shipment or failures which are
caused by products not supplied by Millennia. This limited warranty
does not cover failures which arise from accident, misuse, abuse,
neglect, mishandling, misapplication, faulty installation, improper adjustment, alteration or modification of product, incompatibilities, line-power
surges, acts of God, or service performed by anyone other than Millennia or its authorized agent. Vacuum tube failures are not covered under
warranty.
LIMITS AND EXCLUSIONS
There are no express warranties except as listed above. Millennia shall
not be liable for special, subsequent, incidental, consequential, or
punitive damages, including, but not limited to: damage to recordings,
broadcasts, microphones, mixing consoles, or any associated equipment, downtime costs, loss of goodwill, or claims of any party dealing
with purchaser for such damages resulting from the use of this product.
All warranties, express and implied, including the warranties of merchantability and fitness for a particular purpose are limited to the applicable
warranty period set forth above.
Some states do not allow the exclusion or limitation of incidental or
consequential damages, or length of time an implied warranty remains in
effect. As such, the above exclusions may not apply. This warranty gives
you specific legal rights and you may also have other rights which can
vary from state to state.
REAMP® is a registered U.S. trademark. REAMP technology is used
under license -- U.S. Pat no. 6,005,950.
Twin Direct
3
TABLE OF CONTENTS
GOVERNMENTAL NOTICES4
INSPECTION7
SAFETY PRECAUTIONS9
DESIGN CRITERIA11
QUICK START12
FRONT PANEL FUNCTIONS
Input Section13
Equalizer Section17
Routing Section19
REAR PANEL FUNCTIONS20
SIGNAL FLOW DIAGRAM26
GROUND LIFTING & ISOLATION28
JUMPER MAPS29
ASSEMBLY INSTRUCTIONS (Rack Mount, etc..)31
PERFORMANCE GRAPHS33
SPECIFICATIONS36
CONTACT INFORMATIONBack Cover
http://www.mil-media.com
TD-1
4
FCC NOTICE
INFORMATION FOR THE USER
This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment
does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by
one or more of the following measures:
1) Reorient or relocate the receiving antenna
2) Increase the separation between the equipment and receiver
3) Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
4) Consult the dealer of an experienced radio/TV technician
for help.
The user may find the following publication prepared by the
Federal Communications Commission helpful:
“How to Identify and Resolve Radio-TV Interference Problems” (Stock Number 004-000-00345-4)
Available exclusively from the Superintendent of Documents,
Government Printing Office, Washington, DC 20402 (telephone
202-512-1800)
FCC WARNING
Changes or modifications not expressly approved by the party
responsible for compliance to Part 15 of the FCC Rules could
void the user’s authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation
is subject to the following two conditions: (1) This device may
Twin Direct
5
not cause harmful interference, and (2) This device must
accept any interference received, including interference that
may cause undesired operation. This Product Certified to
meet the Standards in the categories: Audio/Video and Musical Instrument Apparatus for Household, Commercial, and
Similar General Use EMI: FCC Part 15 Class B; ICAN ICES-003
Class B; EN55022 Class B
CE NOTICE
INFORMATION FOR THE USER
This equipment has been tested and found to comply with the
limits for a Class B or Class 2 digital device, pursuant to EN
55022 Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will
be required to correct the interference at his own expense.
The user may find the following publication prepared by the
Federal Communications Commission helpful:
“How to Identify and Resolve Radio-TV Interference Problems” (Stock Number 004-000-00345-4)
Available exclusively from the Superintendent of Documents,
Government Printing Office, Washington, DC 20402 (telephone
202-512-1800
WARNING
Changes or modifications not expressly approved by the party
responsible for compliance to EN 55022 Rules could void the
user’s authority to operate the equipment.
TD-1
6
ICAN Class B Digital Equipment
This Class B apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les
exigences due Reglement sur le materiel brouilleur du
Canada
BZT Declaration (German)
Bescheinigung de Millennia Media, Inc. hiermit wird bescheinigt,
dass die Direct Box TD-1 “TWIN DIRECT” in Übereinstimmung
mit den Bestimmungen der VFG 523/1969, DIN 57871 / VDE 0871
/ 09.84, und DIN 75875 Part 1 A2 / 10.90 (Amtsblattvertugung)
funk-entstört ist.
Der Deutshchen Bundespost wurde das Inverkehrbringen dieses
Gerats angezeight und die Berechtigung zur Überprüfung der
Serie auf Einhaltung der Bestimmungen eingeräumt.
Einhaltung mit betreffenden Bestimmungen kommt darauf an,
dass geschirmte Ausführungen gebraucht werden. Für die
Beschaffung richtiger Ausführungen ist der Betreiber
Verantwortluich.
Dieses Gerät wurde sowohl einzelnals auch in einer Anlage, die
einen normalen Anwendungsfall nachbildet, auf die Einhaltung
der Funkentstörbestimmungen gerprüft. Es ist jedoch möglich,
dass die Funkentstörbestimmungenunter Ungunstigen
Umständen bei anderen Gerätekombinationen nicht Eingehalten
werden. Der Betreiber ist für die Einhaltung der
funkeutstörungsbestimmungen seiner gesamten Anlage
verantwortlich, in der dieses Gerät betrieben wird.
Millennia Media, Inc.
Twin Direct
7
INSPECTION
Congratulations on your purchase of the Millennia TD-1 TWIN DIRECT
recording channel. TD-1 is the culmination of meticulous listening tests
on innumerable circuit, topology, and packaging designs over decades
of audio product development experience. Your TD-1 is a finely tuned
instrument intended for critical professional applications — with the
added benefits of selectable vacuum tube DI amplifier, all discrete FET
solid state DI amplifier, variable input impedances, Speaker Soak
and REAMP®, we feel it offers the world’s best sounding and most
sonically versatile DI + recording path. With the emergence of 24+ bit
digital audio, recording engineers are faced with a new requirement for
undistorted dynamic range. Twin Direct meets this challenge exceptionally well.
NOTE: Any changes or modifications not expressly approved by
MILLENNIA MEDIA, INC. (Millennia) could void your authority to operate
this equipment under the EC, ICAN, or FCC rules.
1. Copyright: You acknowledge that no title to the intellectual property in
the TD-1 is transferred to you.
2. Inspection: Inspect packing box(es), TD-1, and cable(s) for damage,
unusual marks, or shortages. It is your responsibility to report damage,
shortage, or mis-shipments in a timely manner. Millennia and/or its
dealers will not be responsible for claims arising from damage in
shipping, nor will claims for shortage or mis-shipments be honored, more
than 10 days after ship date.
(tm)
,
3. Read this manual carefully and completely before attempting to use
the TD-1. Improper operation could result in damage to product. It is the
user’s responsibility to understand the safe use and operation of this
device.
4. The shipping box of the TD-1 system will include (1) Owner’s Manual,
(2) TD-1, (3) a UL approved power cord, (4) Owner’s Registration Card,
(5) Four rubber feet with mounting hardware, and (6) Steel carrying
handle with mounting hardware. Fill out the Owner’s Registration Card
and return to Millennia at your earliest ability.
The material contained in this manual consists of information that is
property of Millennia and is intended solely for use by the purchasers of
the equipment described in this manual. Without express written permis-
TD-1
8
sion, Millennia prohibits the duplication of any portion of this manual or
the use thereof for any purpose other than the operation and/or maintenance of the equipment described in this manual. This manual may not
be duplicated in whole or in part without the written consent of Millennia.
TD-1,TWIN DIRECT, Speaker Soak, and Twin Topology are trademarks of Millennia Media, Inc. All other trademarks are property of their
respective holders. TD-1 serial number is located on the rear left side of
each unit. We suggest that you record the serial number in the space
provided below. Refer to it whenever you call an authorized Millennia
repair facility or the manufacturer. Make sure that you return your completed warranty card immediately.
Serial No.
______________________________________________________________
Purchase Date
___________________________________________________________
Where Purchased
_________________________________________________________
Twin Direct
9
SAFETY PRECAUTIONS
For your safety and the safety of others, be sure to read and understand
all safety and operational instructions before attempting to use the TD-1.
WARNING: The TD-1 internal circuitry carries lethal voltages.
Carefully observe all warnings, precautions, and instructions on the TD-1
and as described in the instructions supplied with the unit.
1. WATER, MOISTURE, AND SPILLAGE
Do not attempt to use the TD-1 in, near, or around water or in unusually
moist environments, such as near a sink or swimming pool. Prevent liquids or any other materials or objects from spilling or falling into the TD-1
unit.
2. HEAT AND VENTILATION
Be sure to allow adequate ventilation to TD-1 and avoid using or installing
unit in close proximity to heat sources, such as heaters, stoves, radiators,
power amplifiers, spotlights, or other heat-producing appliances or equipment.
3. POWER SOURCES AND POWER CORD PROTECTION
The TD-1 Power Supply should be connected to a power source only of
the type described in the operating instructions or as marked on the Power
Supply. Route the power cord so that it is not likely to be walked on or
pinched by having objects placed on it. Pay particular attention to plugs,
receptacles, and the point where the AC power cord exits the TD-1.
4. GROUNDING
For your safety, it is extremely important that the grounding pin of the 3-wire
power cable (included with unit) be inserted into a grounding type 3-pin
power outlet. If you are unable to insert the plug into an existing outlet, contact an electrician to install a properly grounded 3-pin power outlet, preferably that with OFI / CFI protection, if available.
5. DAMAGE REQUIRING SERVICE
This unit should be repaired or serviced by qualified personnel whenever:
· The AC power cord has been damaged, or
· Objects have fallen or liquid has spilled into any TD-1 unit, or
· The unit does not function properly or exhibits a marked change in perfor-
· The unit has been abused, dropped, or damaged, or
mance, or
TD-1
10
· The unit has been exposed to rain or moisture
6. SERVICING
Lethal voltages are found inside the TD-1 chassis. The user should
not attempt to repair or service this unit. All servicing and/or repairs should
be referred to Millennia.
If, after reading all instructions, precautions, and warnings, you have remaining questions, please contact Millennia directly before attempting to
use your TD-1. Retain this owner’s manual as a record of your purchase to
aid positive identification in the event of loss.
Before connecting power to the TD-1, assure that the rear panel voltage
selection fuse block switch is set correctly. In the USA or Japan, TD-1 is
shipped with the voltage selection block set to 100-120 VAC. If you
change the voltage selection block to 200-240 VAC usage, be sure to
change both fuses to the correct types. See “Rear Panel” instructions for
proper fuse requirements.
The TD-1 enclosure measures approximately 8.5" wide x 3.5" high x
13.5" deep and is designed for mounting (in pairs) into a standard 2U,
19" equipment rack. If the TD-1 is mounted in a road case or other rack
which is prone to strong vibration or shock, it is highly recommended that
the rear of the TD-1 be supported or otherwise reinforced to withstand
such conditions. TD-1 contains high voltage vacuum tube and discrete
transistors, many running in Class-A bias. As such, the TD-1 TWINDIRECT runs quite warm and should be mounted for proper ventilation
with at least one rack screw space open above and below the unit.
TD-1 is designed on a common ground topology. For high quality
operation, and for your own safety and the safety of others, do not defeat
the power cord earth grounding pin. If required, earth ground can be lifted
safely via built-in switching, described later.
TD-1 FRONT-END PROTECTION: Millennia Music & Media
Systems enjoys a reputation for what many top engineers and producers
call the world’s most musically accurate and dynamically uniform
microphone preamplifier — the HV-3: an option on the TD-1. But this
thoroughbred design is not achieved without certain operating criteria.
Back-to-back Zener diodes protect the super-matched discrete bipolar
input transistors against high transient energy spikes common when
inserting and extracting XLR connectors. To maintain top performance
and protect the TD-1’s sensitive HV-3 front-end, it is advised that you do
Twin Direct
11
not insert or extract XLR connectors with power on. Get in the habit of
disabling AC power and waiting about ten seconds for the phantom
power to fully “ramp down” before inserting or removing a microphone.
This is good advice for protecting your microphone investments, as well.
DESIGN
The TD-1 TWIN DIRECT is a collection of core Millennia products
designed into a sophisticated recording channel + direct box. We
believe TD-1 is the world’s most versatile and absolutely best sounding
DI (direct injection) box — and much more. TD-1 offers numerous signal
path topologies (vacuum tube, discrete transistors, monolithics, three
different audio transformers, speaker soak, REAMPs, etc.) all sonically
optimized to their respective strengths.
TD-1 offers Twin Topology DI input stages which can be switched to
employ high voltage vacuum tube (12AT7) -or- 100% discrete transistor
(J-FET) amplifiers. The user may also select low, medium, or high input
impedance on both input topologies, making TWIN DIRECT the most
versatile DI available. The TD-1 also offers two bands of Millennia’s
acclaimed NSEQ-2 fully parametric equalization, used by top mastering
facilities around the globe, fully sweepable from 20 Hz to 25 kHz. The
NSEQ-2 bands are provided for high-resolution audio sculpting of
instruments such as guitar, bass and keyboard, or artistic and corrective
work — adding “air” and “punch,” removing “mud,” and so forth — all with
the natural, artifact-free audio qualities NSEQ is known for. Numerous
functions and routing paths are available, as noted by name:
1.) HV-3 discrete hybrid solid state microphone preamplifier (option)
2.) STT-1 ORIGIN vacuum tube DI Input with selectable impedances
3.) Class-A biased discrete J-FET DI input with selectable impedances
OK, let’s get started. Disconnect TWIN DIRECT power for now. Grab a
guitar or bass or some other source with a 1/4" phone jack output. Plug
your source into TWIN DIRECT’s front panel 1/4" jack. Connect any
TWIN DIRECT output to your destination, such as the line input of a
mixer. With the TT (Twin Topology) switch, select vacuum tube or solid
state input buffer amplifier. Turn gain knob fully CCW. Now connect
power to the unit. Let the unit “warm up” for a few minutes.
Turn the gain knob CW until a normal operating level is reached. If there
is too much level at the lowest gain setting, engage the PAD switch.
Press the TT switch a few times and listen to the sonic differences
between the tube and solid state DI paths. A short auto-mute of the signal
path is normal on certain switch selections, including TT. Next, check all
three input impedance switch positions for the best sounding input
loading. If no difference is detected, use the 2M position. Select the EQ
bands and make some normal EQ adjustments to see what effect they
have on your source. You’re rolling!
See the signal flow diagram later in this manual for TWIN DIRECT’s
extensive versatility. Mic input (option) is routed directly to an authentic
HV-3 microphone preamplifier with up to 65 dB of gain. Line input is
routed to a discrete-hybrid balanced receiver with +45 dB of gain.
Twin Direct
13
Instrument (DI) input is routed via TT switch to vacuum tube buffer amplifier or discrete solid state (FET) buffer amplifier, with triple input impedance selection switching on both topologies. Any input may be attenuated via a -20 dB pad switch. The DI input also offers a selectable guitar
amplifier Speaker Soaktm input and selectable buffered or unbuffered
“direct DI through” output. All inputs are followed by two bands of NSEQ-2
fully parametric EQ stages (20 Hz – 25 kHz). Numerous routing, output,
and grounding options round out the world’s most versatile and best
sounding “direct box.”
FRONT PANEL — INPUT SECTION —
INSTRUMENT DI / SPEAKER SOAKtm INPUT ¼” Unbal Phone Jack
The heart of TWIN DIRECT. A normalled ¼” mono Phone Jack which
accepts any unbalanced source, such as MIDI instrument (keyboard,
sampler, etc..), electric guitar, electric bass, piezoelectric acoustic guitar
pickup, etc.. This DI (Direct Inject) input will accept virtually any known DI
signal level, from very low output passive sources, to high output (>15
Volts RMS) active sources. This input is also designed to accept direct
feed from a power amplifier, such as a guitar amp (see “Speaker Soak”
switch, below). When inserting or extracting a connector from this input, it
is advised that your destination level be turned down or muted.
Most keyboards and MIDI instruments have electrically buffered outputs
exhibiting very low output impedance, generally under 150 ohms. On the
other hand, passive electric guitar pickups exhibit significantly higher
output impedance. To properly “couple” this diversity of instruments in
the most musically pleasing manner, TWIN DIRECT offers three differ-
ent input impedance settings that will help an artist “fine tune” the musicality of any instrument, pickup, or program. Each time you try a new instrument or MIDI device with the TWIN DIRECT, be sure to experiment with
different topologies and input impedances to find the ideal sonic performance (see “Twin Topology” and “Impedance Select” below). There is
no inherently “right” setting — use your ears and production goals to
determine the best impedance bridge and input topology.
TWIN DIRECT’s dual DI amplifiers offer rich musical variation with
electric instruments — vacuum tube amplifiers are well known to “couple”
electric guitar and bass pickups differently than solid-state amplifiers.
Vacuum tubes offer a unique “sound” that solid-state doesn’t, and visa
versa. Each amplifier topology offers complimentary sonic performance
to the other, and both are widely used in professional recording and
TD-1
14
TD-1 FRONT PANEL
Twin Direct
15
stage work. Taking full advantage of this sonic duality, TWIN DIRECT
offers Millennia’s Twin Topology® high voltage vacuum tube DI amplifier -and- all discrete J-FET transistor amplifier. Either topology is
selectable with the Twin Topology (TT) select switch. More information
on this unique technology is found in the “Input TT” section, below.
LINE INPUT + REAMP® INPUT Balanced Female XLR
Standard 3-pin XLR input (Pin 2 hot) which will accept any balanced or
unbalanced line-level signal. A 20 dB pad (attenuator) is included for
ultra-hot signals, but because of the TD-1’s extremely high native line
input headroom (+23 dBu) this pad should rarely be required (see “Pad”
switch, below). When inserting or extracting a connector from this input, it
is advised that your destination level be turned down or muted.
This input employs a discrete-hybrid, solid-state amplifier topology and
fixed input impedance (6,900 ohms x 2). One common use of this input will
be playback of recorded electric guitar or electric bass program. Guitar
and bass program can be recorded and then played back at a later
date directly into a guitar amplifier using TWIN DIRECT’s patented
REAMP feature. This allows an audio engineer to achieve the original
“coupling” characteristics of a guitarist and live guitar amplifier without the
guitarist’s presence, thus allowing more time for experimentation with
different guitar amps, room tones, and mic technique at any future time.
(See “REAMP” section, below.)
Of course, TWIN DIRECT’s Line Input is ideal for any other line-level
source, including mixer outputs, recording device outputs, samplers,
DAWs, synths, DACs, active instruments, outboard gear such as compressors and stand-alone instrument preamplifiers.
DI INPUT IMPEDANCE SELECT Dual pushbutton switches
A pair of switches which allow selection of three input impedances on the
¼” Instrument Input (above). Acoustic instrument pickups are especially
sensitive to load impedance. Each input impedance will couple instruments with varying sonic performance. Adjust these switches with each
new source to find the most musically satisfying setting. In some cases,
all three impedance settings will give very similar sonic results. In other
cases, the differences will be obvious. Remember, “musically correct” is
an artistic production judgement — only your ears can tell you which input
impedance is optimal for your instrument and artistic goals. Settings are
LOW (aprox 470 Kilohms), MEDIUM (aprox 2 Megohms), HIGH (aprox
10 Megohms). HIGH input impedance is achieved with both switches
TD-1
16
disengaged. DI input impedance is selectable only on DI input, not on
mic or line inputs. 2M is recommended as the default setting.
+48V PHANTOM POWER Pushbutton Switch (HV-3 Preamp option)
A switch which provides phantom power (+48 Volts DC) to the microphone when HV-3 mic preamp option is installed. 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 traditional 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.
Polarity on main outputs is flipped 180 degrees with respect to the input
when this switch is depressed and illuminated.
SPEAKER SOAKtm INPUT Pushbutton Switch
Twin Direct
17
A switch which allows the Instrument DI / Speaker Soak Input (above) to
accept signal directly from the output of a power amplifier connected to
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 amplifier 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 presence of that hum and hiss.
GAIN CONTROL
In standard configuration, gain control is a potentiometer offering up to 45
dB of discrete gain. With optional HV-3 preamplifier installed, gain
control can be a 12 position rotary gain-set switch (5 dB per step), or a
potentiometer, offering up to 65 dB of discrete gain.
— FRONT PANEL: EQUALIZER SECTION —
PARAMETRIC E.Q. 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.
Because of the equalizer’s unique network-shunt design, EQ bands
should have no detectable sonic signature when they are in circuit as
TD-1
18
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 E.Q. BOOST/CUT CONTROL
Conductive plastic rotary potentiometer (2 ea) offering up to 15 dB of
boost and cut. Frequency curve shape is peak/dip type (see “Q”). The
Boost / Cut potentiometer has 21 detent positions for accurate repeatability and session logging. Detents can be removed by the factory upon
customer request.
PARAMETRIC E.Q. FREQUENCY CONTROL
Conductive plastic rotary potentiometer (2 ea) which sweeps all center
frequencies from 20 Hz to 25 kHz. The low band (LF) sweeps 20 Hz to
250 Hz -or- 200 Hz to 2.5 kHz, depending on the status of Frequency
Range Switch (below). The high band (HF) sweeps 250 Hz to 2.5 kHz or- 2.5 kHz to 25 kHz, depending on the status of Frequency Range
Switch (below). This control is optionally available with 21-step detents
for accurate repeatability and logging.
PARAMETRIC E.Q. FREQ RANGE SELECT Pushbutton Switch “10X”
A switch (2 ea) which selects 1X or 10X parametric frequency multiplier.
When switch is depressed and corresponding LED is illuminated,
frequencies as shown on front panel legend are multiplied by 10X. When
switch is not depressed and LED is not illuminated, frequencies are as
shown on front panel legend.
PARAMETRIC E.Q. QUALITY CONTROL “Q”
Conductive plastic rotary potentiometer (2 ea) which sweeps “Q” (Quality
factor) from 0.4 to 4.0. “Q” is defined as the ratio of the center frequency to
the bandwidth. For example, a filter boost setting with “3 dB down” points
near 100 Hz and 1000 Hz exhibits a “Q” of approximately 0.4. To achieve
a reasonably equivalent response of shelving EQ, simply dial in the
broadest Q (0.4) and boost or cut near a typical frequency extreme (e.g.,
50 Hz or 10 kHz). This control is optionally available with 21-step detents
for accurate repeatability and session logging.
A switch which places the single (yes, only one) active EQ amplifier in the
signal path. Minimal signal path EQ topology assures consistently faithful
musical performance.
Twin Direct
19
— FRONT PANEL: ROUTING SECTION —
LED INDICATORS Power / SP / OL
Three LEDs (Light Emitting Diodes) which indicate the presence of DC
power (Amber), the presence of a nominal (-25 dBu) audio signal
(Green), and the presence of an audio signal which has exceeded +26
dBu at the balanced line level output (Red). Note that TWIN DIRECT’s
balanced line level output has a maximum output level of +32 dBu. As
such, when the red overload LED turns on, the TD-1 balanced line output
is not clipping, but has twice the reserve output voltage headroom
remaining before clipping. The OL LED is set to indicate a maximum
operating level in typical audio environments.
INPUT “TT” TWIN TOPOLOGY Pushbutton Switch
A switch which selects the amplifier topology used to buffer the DI
Instrument Input. When switch is depressed and illuminated, the Instrument Input is routed to an all-discrete, solid-state J-FET (field-effect
transistor) DI buffer amplifier providing musically accurate Millennia
audio performance. When switch is not depressed and not illuminated,
the Instrument Input is routed to a high voltage twin triode vacuum tube
(12AT7) DI buffer amplifier which can provide a softer, rounder tonal
coloration. Note that Twin Topology input amplifiers are available only
on the DI input, not on the Mic or Line inputs. Mic and Line inputs are
routed directly to a discrete-hybrid solid-state amplifier (see Signal Flow
Diagram).
INPUT SELECT Pushbutton Switch
A switch which selects between the Line/Mic and Instrument inputs. When
switch is depressed and illuminated, the Line/Mic Input is selected.
When switch is not depressed and non-illuminated, the Instrument DI
Input is selected.
PAD -20 dB Pushbutton Switch
A switch which attenuates (“pads”) all inputs (balanced or unbalanced)
by -20 dB, thus increasing the maximum input headroom. Pad is engaged when switch is depressed and illuminated. In most recording or
stage applications, this pad will not be necessary and is included only
for unusually hot sources.
TD-1
20
REAR PANEL
MICROPHONE INPUT “HV-3 MIC IN” (OPTION)
Millennia’s HV-3 microphone preamplifier is a world standard in classical and critical acoustic music recording. Now used to record well over
half of all major Hollywood film scores, chosen by countless recording
and touring artists, employed by numerous microphone manufacturers
for research and development, and found in more symphony and opera
halls than any other — we believe there is no better choice when musical
reality and dynamic uniformity are sonic priorities.
HV-3 input is a conventional 3-pin female XLR input jack for use with all
standard balanced microphones, both phantom and non-phantom
powered. Provides +48 Volts DC Phantom powering via front panel
switch. Input impedance is approximately 6,200 ohms with phantom
power switched in. When inserting or extracting a connector from this
input, it is advised that your destination level be turned down or muted.
Microphone Input shares the same internal signal path as the balanced
line level (front panel) input but is not designed as a mixing path. For
optimal performance when line input is in use, disconnect microphone,
and visa versa. To achieve a signal path that is identical to Millennia’s
HV-3B, HV-3C, or HV-3D units, use the active balanced line ouput (Main
Output #1, below).
Pin 2 is positive polarity. Pin 3 is negative polarity. Connector contacts
are Neutrik gold plated. It is suggested that XLR cable connectors used
with the TD-1 employ identical plating. Maximum microphone input level
is +23 dBu. For reference, a Neumann U87Ai directly in front of a screaming vocalist (127 dB SPL) will output approximately -6 dBu.
Unsatisfied with “off-the-shelf” DI transformer solutions, Millennia designed a superior DI-dedicated transformer from the ground up. This
superior large geometry transformer (Millennia type DIT-01) exhibits
better than 3 Hz to 300 kHz frequency response (-3 dB), very low distortion, and excellent phase uniformity.
Output employs conventional 3-pin male XLR connector providing the
transformer-coupled, fully “galvanically isolated” microphone level
signal. Pin 1 is ground. Pin 2 is positive polarity. Pin 3 is negative polarity. Output impedance is approximately 150 ohms, which is nominally
Twin Direct
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TD-1 REAR PANEL
TD-1
22
equivalent to most professional recording microphone. Ground (pin 1)
may be lifted by engaging (up position) the toggle switch to the right of
this XLR (see rear panel drawing).
Use this transformer-isolated output when (1) you require a microphonelevel signal or simply desire the coloration effect offered by certain
outboard mic preamps, (2) your application requires 100% galvanic
isolation, or (3) as a last resort if the Line Output (above) level is too hot,
or if your destination cannot handle line-level program. Output XLR
connector contacts are Neutrik gold plated. It is suggested that XLR
cable connectors used with the TD-1 employ identical plating.
TRANSFORMER OUTPUT GROUND LIFT Toggle Switch
A toggle switch which, when in the up position, lifts internal ground from
the Transformer-Coupled Output (above). When switch is in down
position, Transformer Output XLR Pin 1 sources internal analog ground.
MAIN OUTPUT #1 “BAL LINE OUTS”
Conventional three pin male XLR and 1/4" stereo phone connectors
wired in parallel, providing differentially balanced active line level output.
Can be used simultaneously with all other outputs. Pin 1 (sleeve) is
ground. Pin 2 (tip) is positive polarity. Pin 3 (ring) is negative polarity. See
Jumper Map for instructions on changing configuration for Pin 3 positive
polarity. This balanced line level output is capable of driving 600 ohm
loads and long, high capacitance cables with a maximum output level of
+32 dBu. Outputs may be configured in an unbalanced pin 2 (tip) hot
configuration by either grounding pin 3 (ring), or taking pin 2 directly as
an unbalanced signal while floating (not connecting) pin 3 (ring). In the
latter configuration, output is 6 dB lower than the former configuration.
XLR connector contacts are Neutrik gold plated. It is suggested that XLR
cable connectors used with the TD-1 employ identical plating.
MAIN OUTPUT #2 “UNBAL LINE OUTS”
Conventional three pin male XLR and 1/4" mono phone connectors wired
in parallel, providing unbalanced active line level outputs. Can be used
simultaneously with all other outputs. Pin 1 (sleeve) is ground. Pin 2 (tip)
is positive polarity. Pin 3 (ring) is ground. These unbalanced line level
outputs are capable of driving 600 ohm loads and long, high capacitance cables with a maximum output level of +26 dBu. Outputs are 100%
discrete solid state (total of seven Field Effect Transistors) and are fully
Class-A biased. These outputs will usually drive balanced / differential
destinations with no interface concerns. In the rare instance where a
balanced destination exhibits difficulty with an unbalanced source, use
Twin Direct
23
the balanced XLR or ¼” line output (above). XLR connector contacts are
Neutrik gold plated. It is suggested that XLR cable connectors used with
the TD-1 employ identical plating.
INSTRUMENT DI DIRECT OUTPUT “DIRECT OUT”
Conventional ¼” phone jack providing unbalanced output directly
(“multed”) from DI input — before vacuum tube or discrete transistor
impedance buffers. This output is taken directly from the ¼” DI input jack.
Direct Output can be used simultaneously with all other outputs. Ring and
Sleeve are ground. With a positive input polarity, Tip is positive-going
output polarity. This passive Direct Output can be also jumper selected
with active buffering from DI input. (See Jumper Map and Signal Flow
Diagram later in manual.) IMPORTANT: Using the Direct Output (buffered or unbuffered) will impact DI input impedance. Unless you have a
specific application for the direct output, it is best to leave this output
unconnected.
REAMP
Conventional 1/4" female phone connectors (2 ea) providing passiveguitar-pickup emulation via the patented REAMP technology (U.S. Pat
no. 6,005,950). Tip is signal positive polarity, Ring and Sleeve are
galvanically isolated ground. Millennia helped develop the original
REAMP concept, and now refines REAMP-ing technology to more
effectively emulate the output characteristics of Stratocaster
style single-coil pickups (REAMP Type I) and Les Paul® style dual-coil
“hum bucking” pickups (REAMP Type II). Both REAMP outputs can be
used simultaneously along with all other TWIN DIRECT outputs.
“Active sources” such as Tape Machine, DAW, and Hard Disk Recorder
provide an output impedance roughly 100 times lower than found on
passive electric guitar pickups. Driving a guitar amplifier from such
active sources will often result in a signal that sounds too “clean.” TWINDIRECT’s patented REAMP guitar simulation magnetics provide both
level and impedance matching characteristics which mimic traditional
electric guitar pickups, thus tricking the guitar amplifier to sound like a
live guitarist is playing. Use REAMP outputs to “re-amplify” a guitarist’s
performance at a later date, allowing unlimited time for experimentation
with different guitar amplifiers and miking techniques long after the
guitarist has gone home.
REAMP outputs are driven from specially wound shielded magnetics
designed to closely emulate the output characteristic of each guitar
pickup. TD-1 outputs can also be special-ordered with dual Les Paul or
®
OUTPUTS “REAMP I” & “REAMP II”
®
TD-1
24
dual Strat emulation transformers. As of this writing, other emulation
transformers (Jazz Bass, Precision Bass, etc..) are in development,
though REAMP Type II should perform adequately with most bass guitar
program.
With thanks to our local AES President, Tim Pratt, internal polarity
reversing jumpers are now provided on each REAMP output (see
Jumper Map for detail.) The recording engineer may encounter a
situation where reversing relative polarity of a REAMP output will give
improved artistic results. Note that the relative polarity of other TWINDIRECT outputs remain unchanged, and may be used simultaneously
with REAMP outputs to achieve a wide range of unique “mixed tonality”
effects. Hey, experiment and be daring — you might just find a sound with
“hit” written all over it.
Millennia is also indebted to Professor Steve Errede at the University of
Illinois (Urbana) for his brilliant research into the electro-physics of guitar
pickups. We’re constantly looking for ways to improve our products. If
there is an instrument pickup you would like Millennia to emulate, contact
us.
HEADPHONE OUTPUT “PHONES”
Conventional 1/4" phone jack providing monophonic headphone output.
Output level is adjustable via an inset “PHONES LEVEL” trimmer
potentiometer (below). Tip and Ring are signal positive polarity, Sleeve
is ground. Headphone output has been optimized for use with Sennheiser model HD-600, though any professional headphone will work
great.
HEADPHONE OUTPUT LEVEL “PHONES LEVEL”
Twenty-turn trimmer potentiometer which controls the Headphone
Amplifier Output level. To make a level adjustment, use only an insulated “trimpot wand” designed specifically for trimpot adjustment. Use of
a non-insulated screwdriver could damage your TD-1.
EARTH GROUND LIFT “EARTH LIFT” Pushbutton Switch
A switch through which Earth ground is connected to internal power and
audio ground. Depressing and illuminating this switch will lift Earth ground
from internal audio and power ground paths, and may cure a ground
“hum” problem. When using this switch, the integrity of the Earth-toChassis ground bond is never compromised. Do not lift or defeat the
Earth grounding pin on the AC power plug or receptacle.
Twin Direct
25
AC VOLTAGE MAINS SELECTION “100-120” or “200-240”
A power entry module with removable fuse holder block. This fuse
holder block is selectable for 100 - 120 Volt or 200 - 240 Volt worldwide
mains powering. The fuse block contains two fuses — one fuse is in
series with the hot power line while the other fuse is in series with the
neutral power line. Both fuses must be installed. To change the mains
voltage selection, remove IEC power connector and assure that the TD1 is not connected to mains power. With a non-conductive tool, gently pry
the fuse block away from the power entry module. Remove the two fuses
and replace both with type as shown below. Slide out the internal PC
Board, turn it over, and reinsert the PCB so that the desired AC mains
voltage appears in the viewing window. Double check that the fuses
installed correspond to the AC mains voltage range which appears in the
viewing window. Gently push the fuse block back until it snaps flush and
snug.
FUSES:
For 100-120 VAC mains, use two 5 x 20 mm, 1.0 A, slow blow (N.
America), 250 V, Littelfuse 218 or equiv.
For 200-240 VAC mains, use two 5 x 20 mm, 500 mA, slow blow (N.
American), 250 V, Littelfuse 218 or equiv.
POWER ENTRY “IEC Power Receptacle”
An IEC-type AC line-power receptacle for use with removable cords. Use
only the power cord provided with the TD-1 unit or equivalent U/L approved type SV, SVT, SJ, or SJT AC power supply cord. Never defeatthe third pin earth ground on the power cord. If earth ground lifting is
desired, use the Earth Lift switch (see above).
TD-1
26
Twin Direct
27
SIGNAL FLOW DIAGRAM
TD-1
28
GROUND LIFTS & ISOLATES
Grounding remains a subject of debate within the audio community, yet
standard grounding practices, such as outlined by Muncy, Atkinson,
Giddings, Windt, Fause, (et al) in their foundational AES Journal papers
(J. Audio Eng. Soc. Vol 43 No. 6 1995 June), define clearly the safest
and best performing grounding practices for both recording engineers
and product designers. Design inconsistencies among audio product
manufacturers, along with the variables of real-world recording environments (such as AC power irregularities in large auditoriums and old
churches) can present the recording engineer with “ground” far from zero
volts potential, or even multiple “AC power grounds” exhibiting varying
potential throughout a building or stage.
Because of these wide variations, a well-designed DI box must effectively anticipate all manner of audio and electrical systems. To remedy
most interface problems, TWIN DIRECT provides five different methods
of ground alteration options, allowing an unusually high level of user
control over hums and potential mismatch.
A WORD ON ISOLATION
Inside TWIN DIRECT are jumpers which allow Input and Earth Ground
Lift switches to be converted to Ground Isolation paths. Ground Lift is a
complete removal of all internal ground paths (earth, power, or audio)
from the targeted audio connector(s). Ground Isolation is a technique
whereby the ground path of targeted connector(s) is delivered in series
with certain passive components. Ground remains “sensed” at the
connector(s), yet it becomes “isolated” via series resistance. If pure
ground lifting does not cure a hum problem, isolation may be an effective technique.
Ground lift and isolation options are presented in the Rear Panel, Front
Panel, and Jumper Map sections of this manual. When encountering
hums or buzzes, try altering TWIN DIRECT’s internal grounding, as
follows: (1) Earth Ground Lift, (2) Input Ground Lift, (3) Using Transformer
Output, (4) Using Transformer Output with Ground Lift, (5) Input Ground
Isolate. By itself, the galvanically isolated DIT-01 transformer output will
provide an ideal source of ground isolation. For your personal safety
and the safety of others, never under any circumstance lift earth ground
before it enters the TWIN DIRECT’s IEC power connector. When IEC
earth ground is secured, earth-to-chassis safety integrity is preserved
under all circumstances, regardless of TWIN DIRECT’s internal ground
lift or ground isolation selections.
Twin Direct
29
JUMPER MAPS
INPUT PCB
For more on jumper options inside the TWIN DIRECT, please refer to the
Signal Flow Diagram and detail instruction pages. Remember, before
you remove TWIN DIRECT’s top cover, always assure that the IEC AC
power plug has been disconnected for at least five minutes. This will
allow potentially lethal voltages inside the TWIN DIRECT to dissipate to
a safe level.
TD-1
30
JUMPER MAPS
MAIN PCB
For more on jumper options inside the TWIN DIRECT, please refer to the
Signal Flow Diagram and detail instruction pages. Remember, before
you remove TWIN DIRECT’s top cover, always assure that the IEC AC
power plug has been disconnected for at least five minutes. This will
allow potentially lethal voltages inside the TWIN DIRECT to dissipate to
a safe level.
Intermodulation Distortion0.0009% typical mic / line, 0.03% typical vacuum tube
Frequency Response @ -3 dB points3 Hz to 300 kHz, typical. Varies with path & topology
Frequency Response @ -0.5 dB points7 Hz to 100 kHz, typical. Varies with path & topology
Frequency Response, DIT-01 TransformerBetter than 3 Hz to 300 kHz (+/- 3.0 dB)
Frequency Response, DI - Tube Path-1.0 dB, better than 10 Hz to 40 kHz
Frequency Response, DI - SS Path-1.0 dB, better than 5 Hz to 100 kHz
Maximum Balanced Mic Input Level+23 dBu (Pad not engaged)
Maximum Balanced Line Input Level+23 dBu (+43 dBu Pad engaged, or >100 Volts RMS)
Maximum DI Input Level (Tube & SS)+18 dBu (+26 dBu Pad engaged, or >15 Volts RMS)
Maximum Output Level+32 dBu active balanced outputs, +26 dBu unbal outputs
Maximum System Gain45 dB standard (65 dB with optional HV-3 mic preamp*)
Input Impedance (mic)6,200 ohms, nominal with phantom power engaged
Input Impedance (line)6,900 ohms, pad out.
Input Impedance (DI - Tube & SS)switchable: 470K ohms / 2M ohms / 10M ohms
Output Impedance24.3 (x2) ohms balanced. 49.9 ohms unbalanced
Noise (Mic) (EQ out, 60 dB gain)-128 dB EIN, 150 ohm source
Noise (Line) (EQ in, 10 dB gain)-105 dBu
Noise (DI) (EQ in, 10 dB gain)-90 dBu
Common Mode Rejection Ratio, mic in> 60 dB typical, 100 mV CM (10 Hz - 100 kHz)
Phase Error (EQ out)Less than +/- 5 degrees 50 Hz to 20 kHz, typical
Three-pin XLR PolarityPin 2 = positive polarity, Pin 1 = ground
¼” Phone Polarity (unbal)Sleeve = ground, Tip = positive polarity
¼” Phone Polarity (balanced)Sleeve = ground, Tip = pos pol, Ring = neg pol
SOLID STATE: All discrete J-FET amplifier (50V)
> 80 dB typical @ 60 & 120 Hz, 100 mV CM
EQUALIZER
Maximum Boost & Cut+/- 15 dB (21 step detent)
Parametric “Q” Adjustment RangeQ = 0.4 to 4.0, sweepable
Low Freq (LF) Parametric Sweep Freqs20 Hz to 220 Hz -or- 200 Hz to 2.2 kHz (sw selectable)
High Freq (HF) Parametric Sweep Freqs250 Hz to 2.5 kHz -or- 2.5 kHz to 25 kHz (sw selectable)
Bypass Selection on Each E.Q. Band?Yes
E.Q. IN / OUT Switch?Yes
E.Q. TopologySolid State
ELECTRO-MECHANICAL
Power Consumption35 Watts, nominal
Power Requirements100 VAC to 240 VAC, 50/60 Hz, selectable
Fuses (2 required) 100-120VAC Mains2 ea 1.0 A (5x20mm, U.S. slow-blow, 250V)
200-240VAC Mains2 ea 500 mA (5x20mm, U.S. slow-blow, 250V)
Internal DC Power+250V, +48V, +25V, -25V, +18V, -18V, +12.6V, +5V
Dimensionsapproximately 8.5" W x 13" D x 3.5" H
Net Weightapproximately 15 pounds
* Maximum HV-3 preamplifier gain can be factory modified up to 85 dB upon customer request.
Millennia Media reserves the right to change specification and delivery without notice.
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