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Summary of Contents for Aphex 228
- Page 1 22 8 nidirection a l udio nterfa ce 8-CH A N N E L C O N S U M E R to PR O LE V E L INT ERFA CE [-10dBV U NBALANCED I N to +4dBu BALANCED OUT] S Y S T E M S T H E SO LU TI O N DE L IV E RY S ERIES...
- Page 2 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. Printed by: Stuart F. Cooper Co., Los Angeles.
- Page 3 Even though the Model 228 is a relatively simple design there was a great deal of research and thought that went into its development. We trust that you will find its performance and features equal to what you have come to expect from all Aphex products.
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Page 4: Table Of Contents
6.0 APPENDICES - Page 11 Appendix A - Introduction to Balanced and Unbalanced Wiring Appendix B - Dealing With Ground and Hum Appendix C - Wiring Techniques Appendix D - Standard Cable Wiring Aphex Systems Ltd. Model 228 Page 3... -
Page 5: Quick Start
POWER SWITCH METER SELECT Selects channels to the meter. The metering window can be dimmed by pressing and hold- ing this button for over 1 second. Brightness is restored upon re-pressing the button. Page 4 Aphex Systems Ltd. Model 228... - Page 6 Set the gain of each interface channel: Fully clockwise, the gain is calibrated so a -10dBV unbalanced input produces a +4dBu balanced output. Fully CCW, the gain is unity. NOTE: No extra gain is provided for input levels below -10dBV. Aphex Systems Ltd. Model 228 Page 5...
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Page 7: Installation
3.3 AC LINE CONNECTION Observe the label to the right of the fused receptacle indicating the nominal AC supply voltage that your 228 is built for. If your supply voltage does not agree with this rating, you will have to consult the factory or an authorized distributor or representative about changing the line voltage of your unit. -
Page 8: Controls And Indicators
11.79dB. That precisely raises a -10dBV unbalanced input to a +4dBu balanced output. For matching hotter levels, simply reduce the gain trim setting. At -12dB, you get what is effectively a unity-gain unbalanced-to-balanced interface. Aphex Systems Ltd. Model 228 Page 7... -
Page 9: Specifications
Dimensions: 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. Page 8 Aphex Systems Ltd. Model 228... -
Page 10: Architectural Specifications
Power The unit shall have a self contained power supply operating from the ac line. Primary voltage, connectorization and agency listings shall meet the governing standards where units are sold. Aphex Systems Ltd. Model 228 Page 9... -
Page 11: 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 12: Appendices
Believe it or not, balanced lines are really easier to understand than unbalanced. There is no grounding issue with balanced, and the way it works is perfectly natural and simple. Balancing naturally rejects hum and noise and eliminates all sorts of complications in interfacing. Aphex Systems Ltd. Model 228 Page 11... - Page 13 When you are using unbalanced gear, it is a very good procedure to power all your equipment from one large power isolation transformer. At the very least, make sure all equip- ment is powered together off the same distribution panel circuit (same circuit breaker). Page 12 Aphex Systems Ltd. Model 228...
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Page 14: Appendix B - Dealing With Ground And Hum
For products that have 2-wire power cords, try reversing one of the power cords in the socket. That may reduce the ground current generated by the internal electronics of the offending gear. Redirect Ground Loops Aphex Systems Ltd. Model 228 Page 13... -
Page 15: Appendix C: Wiring Techniques
In addition to the three main contacts on an XLR there is also a grounding lug contact. This lug is connected to the connector’s case (shell). In all Aphex products audio ground and chassis ground are one and the same. - Page 16 In all Aphex products audio ground and chassis ground are one and the same. This is just good, common sense engineering practice (which is what you would expect from us, course). Unfortunately, many products are designed so that the noisy currents from the shield drain into signal ground instead of chassis ground.
- Page 17 Use Table 1 to match the contacts in Table 2 to the contacts on the connector you intend to use. For the exact wiring of the connectors used for each Aphex product - use the diagrams in the respective User’s Manuals.
- Page 18 NC Optional (see Note 6) anced) Wire: two conductor with a shield (twisted pair) Cross- Coupled POSITIVE (HIGH) Unity NEGATIVE (LOW) Balanced Balanced Balanced SHIELD (GND) Gain (Aphex Servo Bal- anced) NC Optional (see Note 6) Aphex Systems Ltd. Model 228 Page 17...
- Page 19 Diagram 3 Balanced to Unbalanced: This configuration should be used with equipment incorporating a conventional active balanced output stage. Most non-Aphex equipment uses this kind of output stage because of its simplicity and low cost. Therefore, you will find yourself using diagram 3 fairly often when interfacing typical equipment together. In this case, the interface gain will be 50% down, giving a 6dB loss of level.
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Page 20: Appendix D: Standard Cable Wiring
These different types of output circuits all look just about alike to any balanced line, but they act dif- ferently when driving an unbalanced line. You need to observe the proper cable wiring for each type of Aphex Systems Ltd. Model 228 Page 19... - Page 21 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 20 Aphex Systems Ltd. Model 228...
- Page 22 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 228 Page 21...
- Page 23 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 22 Aphex Systems Ltd. Model 228...
- Page 24 Notice Aphex is a registered trademark of Aphex Systems Ltd. Use without permission is strictly prohibited. S Y S T E M S Model 228 8-Channel Consumer - to - Pro Analog Audio Level Interface Typical Users & Applications • Airports •...
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