TD-1 Twin Direct Recording Channel Instruction Manual Rev A3, 6/03 (2500) © 2003, Millennia Media, Inc. All rights reserved. Litho in U.S.A.
ONE YEAR WARRANTY 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.
TABLE OF CONTENTS GOVERNMENTAL NOTICES 4 INSPECTION 7 SAFETY PRECAUTIONS 9 DESIGN CRITERIA 11 QUICK START 12 FRONT PANEL FUNCTIONS Input Section 13 Equalizer Section 17 Routing Section 19 REAR PANEL FUNCTIONS 20 SIGNAL FLOW DIAGRAM 26 GROUND LIFTING & ISOLATION 28 JUMPER MAPS 29 ASSEMBLY INSTRUCTIONS (Rack Mount, etc..) 31 PERFORMANCE GRAPHS 33 SPECIFICATIONS 36 CONTACT INFORMATION http://www.mil-media.
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.
not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.
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.
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.
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.
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.
· 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.
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.
1.) Line Input (XLR, front panel) 2.) HV–3 Mic Preamp Input (XLR, rear panel, optional) 3.) DI Instrument Input (1/4" phone, front panel) 4.) Amplifier / Speaker Soak Input (1/4" phone, front panel) TWIN DIRECT has nine different rear-panel audio outputs: 1.) 2.) 3.) 4.) 5.) 6.) 7.) 8.) 9.
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).
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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.
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.
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.
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.
— 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.
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.
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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).
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.
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.
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.
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SIGNAL FLOW DIAGRAM Twin Direct
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.
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.
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.
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PERFORMANCE GRAPHS Twin Direct
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TWIN DIRECT TD-1 SPECIFICATIONS GENERAL Instrument / DI Input Amplifier Topology TUBE: Selected dual triode vacuum tube (250V) SOLID STATE: All discrete J-FET amplifier (50V) THD + Noise, 20 Hz - 30 kHz (35 dB Gain) 0.0005% typical mic / line, 0.03% typical vacuum tube Intermodulation Distortion 0.0009% typical mic / line, 0.03% typical vacuum tube Frequency Response @ -3 dB points 3 Hz to 300 kHz, typical. Varies with path & topology Frequency Response @ -0.5 dB points 7 Hz to 100 kHz, typical.
