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Aphex 207D Instruction Manual Download Page 29

207d

instruction Manual

Aphex Systems Ltd. Model 207D

Page 28

207d

2-ch tube mic preamp with adc

Page 29

Aphex Systems Ltd. Model 207D

Patent Notice

This product is protected under one or more of the following Aphex 

patents.

4,578,648
4,633,501
4,843,626
4,939,471
5,115,471
5,155,769
5,334,947
5,359,665
5,422,602
5,424,488
5,450,034
5,463,695
5,483,600
5,485,077
5,612,612
5,737,432
5,848,167
5,896,458
5,898,395
5,930,374
6,266,423

Summary of Contents for 207D

Page 1: ...ems Ltd 11068 Randall St Sun Valley CA 91352 USA S Y S T E M S two channel tube mic And Instrument preamplier Solution Delivery Series Copyright 2004 Aphex Systems Ltd All rights reserved Produced by...

Page 2: ...and the manufacturing quality of the Model 207D We love to hear from you our customers about your experiences with any of our products Our customer support is unmatched in the industry so please do no...

Page 3: ...Power 4 3 2 Using the Polarity Switch 4 3 3 Using the Pad 4 3 4 Using Low Cut 4 3 5 Using MicLim 4 4 Using Word Clock 4 4 1 External WC 4 4 2 Internal WC 4 5 Using Digital Audio S PDIF Output 4 6 Repl...

Page 4: ...llows you to insert any kind of line level equip ment into the signal path between the 207D s front end preamps mic and instrument and tube output stage The operating level at this jack is in the vici...

Page 5: ...oise floor of the 207 That will result in a very poor signal to noise ratio Always use the most gain possible in the 207 and adjust your mixer s fader or line input gain to accept it and never feed a...

Page 6: ...received high acclaim among some of the world s top sound engineers Meanwhile our Model 107 remained a solid prod uct in the marketplace because of its low cost high 2 0 Introduction performance and v...

Page 7: ...d expensive d c operated sealed bifurcated gold contact relays to switch these functions These relays never oxidize and can remain stationary for many years without contact distortion Next let s look...

Page 8: ...TCHED 48V PHANTOM POWER POLARITY PAD MiCLiM LDR DISCRETE NPN FRONT END LOW CUT FILTER 1 4 TRS PHONE INSERT JACK MiCLiM CONTROL RPA DISCRETE TUBE AMPLIFIER OUTPUT HEADROOM METER DRIVER OPERATING LEVEL...

Page 9: ...end stage and the tube output stage This is clearly shown in the 207D s block diagram at left The inter connect is unbalanced by way of a stereo TRS I O jack on the rear panel You will need a conventi...

Page 10: ...is assumed that the user will likely intermix home hi fi equipment such as cassette decks and CD play ers Most professional recording gear and live sound equipment operates at 4dBu 3 9 OUTPUT TRIM In...

Page 11: ...t active pickups piezo and otherwise are most suited to a 1 megohm impedance at the amplifier input Since we wanted to design the Model 207D to meet the widest requirements we gave it a 1 megohm input...

Page 12: ...Using the 207D interfering with the audio signal carried on the same wires The industry standard phantom power source is posi tive 48 volts d c supplied to pins 2 and 3 through precision low noise 6...

Page 13: ...r possible Even though it is outstanding as a rumble fixer you will notice its presence We suggest as a matter of good practice that you always try isolating the mic from unwanted vibrations instead o...

Page 14: ...ould first double check this setting The Model 207D does not source out its internal word clock so you won t be able to use it for a master clock 4 4 3 Multiple 207D Clocking If several 207D s are to...

Page 15: ...preamps require a lot of circuitry that just won t fit inside Let s not forget too that a really great mic preamp requires its own ingenious circuitry and design It is not surpris ing that of all the...

Page 16: ...ording we believe you will truly appreciate the outstanding performance benefits afforded by the Model 207D their work The low noise and highly detailed open sound of the 207D delivers breathtaking re...

Page 17: ...7 Aphex Systems Ltd Model 207D Distance X 3X Stage Figure 4 4 SPACED PAIR 3 to 1 TECHNIQUE Stage Figure 4 6 M S TECHNIQUE Cardioid Mid Bi Directional Sides Figure 4 5 X Y TECHNIQUE Stage Cardioid Mics...

Page 18: ...ting from accident misuse abuse neglect unauthorized product modification or failure to follow instructions contained in the User s Manual 3 Resulting from repair or attempted repair by anyone not aut...

Page 19: ...us OUTPUT TRIM loss Same Same Same Same infinity to 38dB minus OUTPUT TRIM loss AUDIO Frequency Response EIN Crosstalk THD Tube Type 0 0 5dB 30Hz 30KHz 129dBu Input Shorted 10Hz 22kHz 79dB or better 1...

Page 20: ...gnal before any amplification to prevent input overload The input stage shall be transformerless and actively balanced The preamplified microphone signal shall be sent through an INSERT jack to the ou...

Page 21: ...tutorial will teach you about the principles of balanced and unbalanced lines wiring standards and how to effectively interface them Standards Professional audio equipment usually comes equipped with...

Page 22: ...nds The principle is that the outer shield conductor shields the inner conductor from induced noises This can only work well if the cable is relatively short and the ground at each end of the cable is...

Page 23: ...u re on the same leg by measuring the ac voltage between the hot slots of the different outlets you ve chosen It should be very low or zero That will remedy 50 percent of the cases 6 0 Appendices Chec...

Page 24: ...he picture The standard for terminat ing ground is Pin 1 Sleeve But which ground It could be connected to audio signal ground or chassis ground depending on the method of grounding used by the equipme...

Page 25: ...ECTOR WIRING STANDARDS 3 Pin XLR 1 4 TRS Phone Standard Wiring Convention Balanced Pin 1 Sleeve Ground Shield Earth Screen Pin 2 Tip Positive Signal High Hot Pin 3 Ring Negative Signal Reference Retur...

Page 26: ...nd of balanced output you are dealing with Simply treat it generically Appendices PART 1 BALANCED OUT to BALANCED IN OK for Microphones Standard store bought cable Shield grounded at both ends Positiv...

Page 27: ...PLIFIED SCHEMATIC Voltage Balanced Outputs Used on the 207 Mono Phone Plug Female XLR SIMPLIFIED SCHEMATIC Don t Ground or Connect Pin 3 Ground Pin 3 Directly to Pin 1 Alternatively Carry Pin 3 Throug...

Page 28: ...4 UNBALANCED OUT to BALANCED IN Mono TS Phone Plug Stereo TRS Phone Plug Standard Method Standard Cable Guitar Cord Mono TS Phone Plug Stereo TRS Phone Plug Enhanced Method Pseudo Balanced Advantage R...

Page 29: ...ice This product is protected under one or more of the following Aphex patents 4 578 648 4 633 501 4 843 626 4 939 471 5 115 471 5 155 769 5 334 947 5 359 665 5 422 602 5 424 488 5 450 034 5 463 695 5...

Page 30: ...20 7d instruction Manual Aphex Systems Ltd Model 207D Page 30...

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