TD-1 Twin Direct Recording Channel Instruction Manual © 2007, Millennia Media, Inc. 032107 All rights reserved.
TABLE OF CONTENTS 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.
FCC NOTICE INFORMATION FOR THE USER CE 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.
CAN Class B Digital Equipment INSPECTION This Class B apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. 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.
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. SAFETY PRECAUTIONS TD-1, TWIN DIRECT, Speaker Soak, and Twin Topology are trademarks of Millennia Media, Inc. All other trademarks are property of their respective holders.
10 11 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.
12 13 TWIN DIRECT has four available audio inputs: a discrete-hybrid balanced receiver with +45 dB of gain. Instrument (DI) input is routed via TT switch to a 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.
14 15 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 TD-1 FRONT PANEL Standard 3-pin XLR input (Pin 2 hot) which will accept any balanced or unbalanced line-level signal.
16 17 +48V PHANTOM POWER Pushbutton Switch 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.
18 19 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 EQ 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).
20 21 REAR PANEL MICROPHONE INPUT “HV-3 MIC IN” Millennia’s HV-3 microphone preamplifier is a world standard in classical and critical acoustic music recording.
22 23 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.
24 25 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 TWIN DIRECT outputs remain unchanged, and may be used simultaneously with REAMP outputs to achieve a wide range of unique “mixed tonality” effects.
26 27 SIGNAL FLOW DIAGRAM MIC 2 IN (option) FEMALE XLR (rear panel) LINE IN +48V Phantom OL SP PHANTOM MIC-LINE / INST SELECT -20 dB AUTO-BALANCED ATTENUATOR -20 dB PAD +35 dB DISCRETE BIPOLAR AMPLIFIER SOAK INPUT MUST BE USED WITH SPEAKER CONNECTED! OPTIONAL HV-3 PREAMP TRIODE VACUUM TUBE AMPLIFIER SPEAKER SOAKtm SINGLE-ENDED AUDIO PATH 250V DIFFERENTIAL AUDIO PATH DI / INSTRUMENT IN TT SELECT TT SELECT 1/4“ PHONE JACK (front panel) 470K 2.
28 29 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.
30 31 JUMPER MAPS MAIN PCB Signal polarity is selected via jumpers pairs. When jumpers are on their own headers, polarity is normal. When jumpers straddle two headers, polarity is reversed.
32 33 PERFORMANCE GRAPHS ASSEMBLY OF FOUR RUBBER FEET Locate four large rubber feet and four #10-32 x 5/8" pan head phillips mounting screws, included with TD-1 shipping box. Using a #2 phillips screwdriver, attach each rubber foot with a single #10-32 x 5/8" pan head screw and tighten snug. Rubber feet attach at each corner on the TD-1 bottom, per diagram below. Note that the four provided mounting screws must be used to mount rubber feet.
34 35 TD-1 Line / Mic THD (Active Balanced +27 dBu output) TD-1 Mic Path Phase Response 0.009 0.007 +30 0.005 0.004 +20 0.003 0.002 +10 d e g % 0.001 +0 0.0007 -10 0.0005 0.0004 -20 -30 20 20 50 100 200 500 1k 2k 5k 10k 20k 100 Hz 1K 10K 20K 50k Hz TD-1 Instrument Path (Tube Topology) THD 0.5 0.2 0.1 0.05 % 0.02 0.01 0.005 0.002 0.001 0.0004 20 20k Hz TD-1 TD-1 Instrument Path (Solid State Topology) THD 0.5 0.2 0.1 0.05 % 0.
36 TWIN DIRECT TD-1 SPECIFICATIONS GENERAL Instrument / DI Input Amplifier Topology THD + Noise, 20 Hz - 30 kHz (35 dB Gain) Intermodulation Distortion Frequency Response @ -3 dB points Frequency Response @ -0.
