Manual Auditor Model 2910 120 volts headphone amplifier
Manual Auditor Model 2910 Version 1.0 – 5/2009 Designer: Wolfgang Neumann This user‘s guide contains a description of the product. It in no way represents a guarantee of particular characteristics or results of use. The information in this document has been carefully compiled and verified and, unless otherwise stated or agreed upon, correctly describes the product at the time of packaging with this document.
Content Symbols & Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Scope of Delivery & Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Important Security Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Hook Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols and Notes IN THIS MANUAL A LIGHTNING SYMBOL WITHIN A TRIANGLE WARNS YOU ABOUT THE POTENTIAL FOR DANGEROUS ELECTRICAL SHOCKS – WHICH CAN ALSO OCCUR EVEN AFTER THE MACHINE HAS BEEN DISCONNECTED FROM A POWER SOURCE. AN EXCLAMATION MARK (!) WITHIN A TRIANGLE IS INTENDED TO MAKE YOU AWARE OF IMPORTANT OPERATIONAL ADVICE AND/OR WARNINGS THAT MUST BE FOLLOWED. BE ESPECIALLY ATTENTIVE TO THESE AND ALWAYS FOLLOW THE ADVICE THEY GIVE.
Important Security Information Please note and retain this manual. Carefully read and follow all of the safety and operating instructions before you use the machine. Be doubly careful to follow all warnings and special safety instructions noted in this manual and on the unit. Connections: Only use the connections as described. Other connections can lead to health risks and equipment damage.
Important Security Information Air circulation: Chassis openings offer ventilation and serve to protect the machine from overheating. Never cover or otherwise close off these openings. never place the machine on a soft surface (carpet, sofa, etc.). Make sure to provide for a mounting space of 4-5 cm/2 inches to the sides of the unit when mounting the unit in racks or cabinets. Controls and switches: Operate the controls and switches only as described in the manual.
Hook Up Power Connection Be very careful to check that the rear chassis power selection switch is set to the correct local line voltage position before using the unit (230 V position: 220-240 V/50 Hz, 115 V position: 110-120 V/60 Hz)! When in doubt about a source, contact your dealer or a professional electrician. Before connecting any equipment make sure that any machine to be connected is turned off. Follow all safety instructions on page 5 and 6. Placement Place the unit on a level and stable surface.
Introduction There is more than meets the eye in working with headphones. A reason for this surely lies in that modern audio production often necessitates decentralized processes. In turn, production phases following such plans more often take place in acoustically questionable rooms.
Introduction The End of Ear Fatigue With headphones, ear fatigue can begin relatively soon, and there are several causes. First, some cans themselves may not be that comfortable to wear... Moreover, a standard headphone amplifier is often an additional important reason for premature ear fatigue. Almost without exception, present-day headphone amplifiers employ comparatively undemanding IC’s.
Power switch Make sure that the voltage switch setting reflects the correct local power line voltage. Power supply connection 10 Input & output left channel The Auditor can be fed from any stereo signal path via its rear panel XLR sockets. Headphone connection on the front panel.
Sockets & Switches Rear Panel/Connections Voltage The rear panel voltage selector switch serves to let the user switch to the local line voltage standard. IMPORTANT ADVICE: Before you use the Auditor, make sure that this switch setting reflects the correct local power line voltage (115 V position: 110-120 volts/6o Hz, 230 V position: 220-240 volts/50 Hz). Power Connection and Fuse Connect the included power cord to the rear power supply socket.
Rear Panel/Connections XLR Connections Switch off the unit before you begin the process of making the first or any subsequent connections (rear panel On/Off switch). Neglecting this can damage either or both your ears and your headphones! Connect the monitoring signal to the left and right channel XLR input sockets. Both XLR outputs transmit the monitoring signal unaltered so that no additional monitoring output is needed for insertion of the Auditor. Input and output stages are electronically balanced.
Front Panel/Connection Headphone Connection You can use all dynamic headphones from 20-600 ohms (connection impedance). Connect your headphones to the standard 1/4" (TRS) stereo jack plug on the front panel. Make sure that the plug is firmly seated for a solid connection. Pin wiring TRS jack: Tip=left channel, ring=right channel, sleeve=ground. Recommendations Unplug the headphone when you switch off the Auditor. Otherwise discharging residual voltages can cause beeping sounds.
Control Elements Usually already a short contemplative moment should be sufficient to get a general idea of the Auditor’s user interface and it’s control elements. Once more the advantages of a consequently purist design approach are becoming obvious – writing and reading the actual operational instructions just takes two beats. Mono The MONO switch creates a sum of the left and right channel, so you can listen to stereo sources also in mono.
Protect Your Hearing Always reduce volume before you put on headphones or before you remove or plug in the headphone. This excludes louder clicks and pops reaching the ear. In addition, this can avoid unpleasant surprise that follows when a headphone’s lower impedance suddenly reproduces a much higher – even painful – level. Always take care of your hearing when monitoring – especially with headphones.
Measurements Audio Precision Auditor Phase/FC 05/14/08 13:23:13 +10 +150 +8 +100 +6 +4 +50 d e g +2 +0 +0 -2 -50 -4 -100 -6 -150 -8 20 d B u 50 100 200 500 1k 2k 5k 10k 20k 50k 100k -10 Hz Phase Response Input vs. Output, Left and Right Channel Measuring output and input 600 Ohm, Volume control Auditor 0 dB. This measurement shows the minimum deviation of phase in the upper frequency range.
Specifications Audio Frequency response: ‹5 Hz to ›200 kHz ( -3 dB) CMRR: -80 dBu (@1 kHz, 0dBu input level and unity gain) Crosstalk @ 1 kHz: -84 dB THD @ 1 kHz: 0,001 % (@1 kHz, 0dBu input level and unity gain) Noise (A-weighted): -97 dBu Dynamic range: 129 dB (@ connection with 600 Ω impedance) Inputs (XLR sockets, electronically balanced) Impedance: ca. 20 kΩ balanced ca.
Guarantee & Product Registration Please note the terms on the guarantee card enclosed in the package. Direct SPL product support requires product registration. Please fill out the guarantee card in printed letters and send it directly to SPL. Or use the online registration form that may be reached at www.spl.info.
