Table of Contents
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Instruction Manual
P/N 999-4260
Revision 1
Released 02/04/2005
Manufactured by
Aphex Systems Ltd.
11068 Randall St.
Sun Valley, CA 91352
USA
S Y S T E M S
Copyright 2004 Aphex Systems Ltd. All rights reserved.
Produced by: Donn Werrbach. Creation tool: Adobe InDesign 2.0
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Summary of Contents for Aphex 207D
- Page 1 Revision 1 Released 02/04/2005 Manufactured by Aphex Systems Ltd. 11068 Randall St. Sun Valley, CA 91352 S Y S T E M S Copyright 2004 Aphex Systems Ltd. All rights reserved. Produced by: Donn Werrbach. Creation tool: Adobe InDesign 2.0...
- Page 2 Rather than being locked into a channel strip that has many functions but does few or none well, the Model 207D gets you the best possible preamplifier and the freedom to choose the best processing for your application. Loop the output of the processing back into the insert of the 207D and you have a complete front end without any compromises.
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Page 3: Table Of Contents
QUICK SETUP 1.0 CONTROLS & INDICATORS PLUS ................ 2.0 INTRODUCTION 2.1 What Distinguishes the Model 207D..................2.2 What Does the Tube Add? ....................2.3 What Else Is So Special? ...................... 2.4 What About The Digital Audio? ..................2.5 Block Diagram ........................ -
Page 4: Quick Setup
You can use any type of balanced, low impedance processors can be readily set to operate at this level. microphone from dynamics to ribbons to condens- ers. The 207D supplies a very clean and stable 48V HEADROOM METER phantom voltage source suitable for even the most As the level approaches 0dB, you run out of head- expensive microphones. -
Page 5: Quick Setup
Level settings. *Why You Shouldn’t Connect a 207D’s Output to a Mic Level Input. The bottom line: you will get a lot of noise and possibly a lot of distortion. The Model 207 is designed to generate a line level output from a mic level input. It optimizes the signal to noise ratio by giving you a strong signal far above the preamplifier’s basic self noise level. -
Page 6: Introduction
207D. competent job. We could have brought out such a “me too” design, but it is important to Aphex that we In addition to improving on the Model 107, the offer products that are more than just “competent”. -
Page 7: What Else Is So Special
There are no databook or textbook pre- With the superb audio quality of the 207D, it is obvi- amplifier circuits in the 207D. It’s all Aphex. ous that only a high grade ADC will be able to capture that quality and bring it into the digital domain. -
Page 8: Block Diagram
207d instruction Manual Introduction Page 8 Aphex Systems Ltd. Model 207D... -
Page 9: Installation And Interfacing
3.3 AC LINE CONNECTION Use only a power cord that carries approvals for use in your location. The 207D’s internal power supply is designed to operate from all nominal power sources from 100 to 240 volts a.c. at 50/60Hz without requiring the user to change any settings. -
Page 10: Operating Level Switch
Both outputs can be used at the same time. Signal ment. In the event that you are not familiar with the will be present if the 207D is set to any internal clock operating levels of the equipment in your system, you frequency or is externally clocked by a valid word should consult your manuals. -
Page 11: Using The 207D
FRONT PANEL VIEW 4.1 SPLIT INDEPENDENT PREAMP SECTIONS impedance. Therefore, we cannot recommend it for The Model 207D is a two channel unit. It contains any type of passive piezoelectric pickup. two separate, independent, preamplifier channels. Each channel operates as a mic preamp or an instru- That said, let’s look at this input a little further. -
Page 12: Using The Microphone Input
The “crosstalk” between mics fault with the mic preamp. may come through different delays due to the dif- fering distances from the sound. These sounds may Plugging and Unplugging a microphone when Page 12 Aphex Systems Ltd. Model 207D... -
Page 13: Using The Pad
Frequency, Hz preamp’s mic input into a line input. In the 207D, we provided a pad of 20dB. That means about every powered and passive microphone in exis- when the pad is on, the net gain of the preamp is tence. -
Page 14: Using Word Clock
This is a lesson not so much about the 207D as about 4.4.2 Internal WC digital editing and processing in general. It is always a In cases where you don’t need to use an external... -
Page 15: Bypassing The Console Altogether
It is not surpris- the 207D you can go direct to tape or disk or DAW ing that of all the parts of a mixing desk, it is mainly and eliminate an entire layer of electronics. -
Page 16: Spaced Pair Technique
Model on the width of the sound platform you want to 207D. When doing so, just be sure to set the gains of include. the two channels reasonably close and do not change them during the recording. - Page 17 Distance X Figure 4-4 SPACED PAIR 3 to 1 TECHNIQUE Stage Cardioid Mics Figure 4-5 X-Y TECHNIQUE Figure 4-7 BINAURAL MIC Stage (Example: Neumann KU-100) Cardioid Mid Bi-Directional Sides Figure 4-6 M-S TECHNIQUE Aphex Systems Ltd. Model 207D Page 17...
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Page 18: Warranty And Service
Any and all warranties are limited to the duration of the warranty stated above. EXCLUSION OF CERTAIN DAMAGES Aphex Systems’ liability for any defective unit is limited to the repair or replacement of said unit, at our option, and shall not include damages of any other kind, whether incidental, consequential, or otherwise. -
Page 19: Specifications
19” W x 1.75” H x 8.25” overall depth (482.6mm W x 445mm H x 209.6mm overall depth); depth behind front panel: 7.5” (190.5mm) Net Weight: Rack-mounted, 6lbs (2.73kg) Shipping Weight: 9lbs (4.1kg) All specifications are subject to change without notice. Aphex Systems Ltd. Model 207D Page 19... -
Page 20: Architectural Specifications
The device shall have a net weight of approximately 6lbs. (2.73kg) and is capable of mounting in a standard electronic equipment rack. Power The unit shall have a self contained power supply operating from the ac line. Primary voltage, connectorization and agency listings shall be appropriate to meet local requirements. Page 20 Aphex Systems Ltd. Model 207D... -
Page 21: Appendix A - Introduction To Balanced And Unbalanced Wiring
Since audio is an alter- plications in interfacing. nating voltage, swinging through negative and posi- tive polarity, the current through the two conductors Balanced transmission works something like this. changes direction each alternate half cycle. Which Aphex Systems Ltd. Model 207D Page 21... -
Page 22: Appendices
That’s why the Model 207D is equipped be reduced by shielding. You are going to find virtu- with a fully balanced I/O. Now that we’ve sold you on... - Page 23 It should be very low or zero. That will unbalanced piece of gear you use. When appropri- remedy 50 percent of the cases. ate, you may alternatively chose the Aphex Model 228 8-channel -10dBV unbalanced to +4dBu bal- anced converter.
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Page 24: Appendix C: Proper Wiring Techniques
This method and others The standard balanced line wiring recommendation are illustrated in Table 2. from Aphex Engineering is this: In the majority of cases maximum noise rejection occurs when the CONNECTOR WIRING STANDARDS shield is connected to the input ground only (espe- cially in locations with high levels of RFI). -
Page 25: Appendix D: Standard Cable Wiring
The following instructions show all the different ways consider impedance when dealing with interfacing you will probably ever need to hook up your 207D as pro line level equipment (impedance “matching” is well as any other equipment you may own. You will mostly a requirement of the past). - Page 26 XLR to 1/4” TRS Phone Balanced Cables From an Output To an Input Female XLR Male XLR To an Input From an Output No Connect Stops Ground Loops Stereo Phone Plug Stereo Phone Plug No Connect Stops Ground Loops Page 26 Aphex Systems Ltd. Model 207D...
- Page 27 Unbalancing loses no output level. You retain full gain. Ground Pin 3 Directly to Pin 1 Do Not Carry Pin 3 Through Cable and Ground Female XLR at Other End Mono Phone Plug Aphex Systems Ltd. Model 207D Page 27...
- Page 28 From Equipment Output Don’t Connect Pin 3 Mono (TS) Phone Plug To Equipment Input To 207 Ground Shield This End Only Insert Jack From Equipment Output Mono (TS) Phone Plug Ground Shield This End Only Page 28 Aphex Systems Ltd. Model 207D...
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Page 29: Patent Notice
20 7 d 2- c h tube mi c pre amp wi th a dc 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... - Page 30 207d instruction Manual Page 30 Aphex Systems Ltd. Model 207D...
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