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Summary of Contents for Symetrix 304
- Page 1 ® User’s Guide www.SymetrixAudio.com...
- Page 2 User’s Guide: 304 Headphone Amplifier 6408 216th St. SW | Mountlake Terrace, WA 98043 | USA | Tel: +1 (425) 778.7728 | Fax: +1 (425) 778.7727 ®...
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Page 3: Before You Begin
Symetrix product. In case of failure, customers inside the U.S. Use only with the cart, stand, should refer all servicing to the Symetrix factory. tripod, bracket, or table speci- Customers outside the U.S. should refer all fied by the manufacturer, or servicing to an authorized Symetrix distributor. -
Page 4: Fast First Time Setup
304 Headphone Amplifier Introduction: First Time Setup Introduction The Symetrix 304 Headphone Amplifier is a 1-in / 4-out signals, which feed the left and right outputs. Switching amplifier designed to drive multiple headphones of to mono with a stereo input provides a quick check of the any impedance. -
Page 5: Front And Rear Panel Overview
7-pin DIN Connector Connect the 7-pin DIN plug end of a Symetrix PS-3 (115 VAC) or PS-3E (230 VAC) here. Connect the AC power connector end of the PS-3 or PS-3E to an AC power source that is of the correct voltage and frequency as marked on the PS-3 or PS-3E. -
Page 6: Impedance, Sensitivity, Loudness
The minimum operating impedance, or maximum load, for each output of the 304 is 8 Ohms. Use as many pairs Proprietary high voltage driver technology allows the 304 of headphones as desired, as long as the total combined to drive even high impedance headphones to maximum impedance (per output) does not fall below 8 Ohms. - Page 7 ® Applications The 304 can be used in the following applications. Please note that this list is far from comprehensive and your imagination may create new uses that we haven’t listed here. Project Studio: Let the 304 expand your mixer’s headphone capacity. You can drive it via a tip-ring-sleeve to dual tip-sleeve cable from your mixer’s headphone jack,...
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Page 8: Block Diagram
User’s Guide: 304 Headphone Amplifier Block Diagram HIGH HIGH VOLTAGE VOLTAGE HEAD- HEAD- PHONE PHONE LEVEL 1 LEVEL 1 HIGH HIGH HEADPHONE HEADPHONE VOLTAGE VOLTAGE OUTPUT 1 OUTPUT 1 HIGH HIGH VOLTAGE VOLTAGE HIGH HIGH HIGH HIGH LINE LINE FILTER... -
Page 9: Troubleshooting Chart
Check input signal levels. The 304 is intended to operate at or near “line” level (+4dBu is nominal) Make sure that the signal you are feeding to the 304 is a line level signal, not mic level. Make sure that all systems components are on the same AC ground. -
Page 10: Architects And Engineers Specifications
The headphone amplifier shall be capable of delivering 35 volts peak-to-peak into a 2000 Ohm load (or greater). The unit shall be capable of operating by means of a Symetrix PS-3 or PS-3E external power supply connected to 115 VAC nominal (95 to 130 VAC), 50/60 Hz or 230 VAC nominal, 207 to 253 VAC, 50 Hz where applicable. -
Page 11: Warranty And Service
4. Write the RA number on the outside of the box. With respect to products purchased by consumers for personal, family, 5. Ship the unit to Symetrix, freight prepaid. We do not accept freight collect or household use, Symetrix expressly disclaims all implied warran- shipments. - Page 12 304 Headphone Amplifier User’s Guide © 2008 Symetrix, Inc. All rights reserved. Printed in the United States of America. The information in this document is subject to change without notice. Symetrix, Inc. shall not be liable for technical or editorial errors or omissions contained herein; nor is it liable for incidental or consequential damages resulting from the furnishing, perfor- mance, or use of this material.
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