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Manual
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P r e f e r e n c e M i c P r e
RackPack Module, Model 2711
Single-channel microphone preamplifier module
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Manual Preference Mic Pre Model 2711 Version 1.0 – 8/2007 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. Sound Performance Lab (SPL) continuously strives to improve its products
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Contents Important Security Information .................................... 4 Hook Up .............................................................. 6 Scope Of Delivery ................................................... 6 Introduction ......................................................... 7 Main Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Rear Panel/Connections ............................................ 8 Wiring
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Important Security Information Please note and retain this information. 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. The following information refers to modules built into the RackPack frame. Connections: Only use the connections as described. Other connec- tions can lead to health risks and equipment damage. Water And Humidity:
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Important Security Information Lightning: Before thunderstorms or other severe weather, disconnect the machine from wall power (but to avoid life threatening lightning strikes, not during a storm). Similarly, before any severe weather, dis- connect ALL the power connections of other machines and antenna and phone/internet cables which may be interconnected so that no light- ning damage or overload results from such secondary connections. Air Circulation: Chassis openings offer ventilation and
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Hook Up Fitting A Module The fitting and/or exchange of modules should only be carried out by qualified persons. Please read the manual of the RackPack frame. It contains all information needed to fit a module as well as all safety and notes and warnings. If you don‘t have the manual at hand, you can download it like all SPL product manuals from our web site http:// www.soundperformancelab.com. Symbols And Notes IN THIS MANUAL A LIGHTNING SYMBOL WITHIN A TRIANGLE WARNS YOU ABOUT THE POTENTI
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Introduction When recording acoustic instruments or vocals, using a microphone is inevitable. The actual output level of a microphone is very low and therefore has to be boosted to studio or line level (0 dB) with a pream- plifier. Sometimes signals have to be boosted by a factor of 2000 or more. As a consequence, the resulting sound quality provided by the preamp is of paramount importance, so a good microphone preamp that does not overdrive is the definitive requirement in order to reco
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Rear Panel/Connections W iring 8 R a c k P a c k : P r e f e r e n c e M i c P r e
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Rear Panel/Connections XL R Sockets, Channel S plit XLR Sockets Connect your microphone to the electronically balanced XLR input. The outputs of the Preference Mic Pre are electronically balanced, too. You can use both XLR output sockets simultaneously. XLR pin wiring: Pin 1 = ground Pin 2 = hot (+) Pin 3 = cold (-) The illustration shows the correct pin wiring of the balanced XLR sockets if an unbalanced wiring is required. Channel Split Since the Preference Mic Pre provides
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Control Elements Mic G ain, About L ev eling Mic Gain With the Mic Gain control you can regulate the preamplification of the microphone signal. It ranges from +14 dB to +72 dB. The input stage can handle input levels of up to 18 dB. The value set with the Mic Gain con- trol defines the output level equally for both Output 1 and Output 2. When you set the Mic Gain you have to co
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Control Elements V U Meter , PP M, -1 0 dB VU Meter 5 3 1 10 7 0 3 5 20 7 70 0 The VU meter displays the output level of the preamp. The gauge indi- 30 5 50 0 1 10 00 0 0 % VU cates levels from -20 dB to +5 dB. If necessary you can lower the sen- SIG OVL sitivity by 10 dB so that the gauge goes up to +15 dB output level (see “-10 dB” below and “About Leveling” on the previous page). The VU meter is custom made to meet SPL specifications and assures a balanced optical perception thanks to it’s
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Control Elements 48 V Phantom P o w er Supply , P ad 48 V Phantom Power Supply The Preference Mic Pre provides 48 volt phantom power for micro- phones requiring external current (generally condenser microphones). Such microphones are dependent upon a clean, consistent and noise-free power supply for optimal operation and audio quality. The Preference Mic Pre continuously delivers precisely 48 V and a maxi- mum current of 14 mA, which will power all microphones. IMPORTANT: All microphones wi
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Control Elements Phase R ev erse, High P ass Filter Phase Reverse With the phase reverse button you invert the polarity of the micro- phone signal. When not pressed (button is not illuminated) the polar- ity is in phase. After pushing the button (button is illuminated) the polarity is inverted. The phase reverse feature comes in very handy if you have to switch the polarity of the XLR input according to the polarity of the micro- phone or the microphone cable. The pin wiring of the XLR socket
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Technology SS M 2019, S er v o Driv e SSM 2019 The Preference Mic Pre is suitable for all common dynamic and con- denser microphones. It works along the principles of an instrumenta- tion amplifier which is a technology that is also used in measurement and medical equipment due to its high common mode rejection of stray pick-ups. It is based on the semiconductor SSM 2019 which sounds more balanced than available alternatives. Low noise and distortion values as well as a broad bandwidth and
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Technology Capacitors,Outputs, Channel S plit Foil And Styroflex Capacitors Only the best MKP and styroflex capacitors are used in the various cir- cuits. They sound more open and dynamic in contrast to the conven- tional ceramic capacitors. Outputs Both output stages are electronically balanced and can be used inde- pendently. They are capable of driving very long cables (up to a few hundred yards, depending on the capacity of the cables and the input stages on the other end). The maximum out
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Copy Master: Recall Settings Artist: . . . .. . . . . . .. . . . . . .. . . . . . .. . . . . . . .. . . . . . .. . . 5 3 1 7 0 10 3 20 5 70 70 50 50 1 100 00 30 0 % VU SIG OVL Album: . . . .. . . . . . .. . . . . . .. . . . . . .. . . . . . . .. . . . . . .. . . Title: . . . .. . . . . . .. . . . . . .. . . . . . .. . . . . . . .. . . . . . .. . . Engineer: . . . .. . . . . . .. . . . . . .. . . . . . .. . . . . .
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Block Diagram R a c k P a c k : P r e f e r e n c e M i c P r e 17
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Specifications Audio Frequency Range 10 Hz bis › 200 kHz CMRR -84 dBu (at 1kHz with -30 dBu input level and 30 dB Gain) THD & N @ 1 kHz Input Level Gain THD & N -30 dBu 30 dB 0,0035% -60 dBu 60 dB 0,047% Noise Gain Noise Level A-weighted 72 dB -57,0 dBu 60 dB -69,0 dBu 30 dB -91,7 dBu E.I.N. (Equivalent Input Noise) -129,0 dBu Dynamic Range 114,0 dB Input XLR connector, electronically balanced Impedance unbalanced ca. 1,6 kOhm Impedance balanced ca. 3,2 kOhm Max. Input Level +18 dBu, +3
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Measurements Sound Performance Lab CMRR 08/20/07 13:48:31 -50 -60 -70 d B u -80 -90 -100 10 20 50 100 200 500 1k 2k 5k 10k 20k Hz CMRR with -30dBu input level and vu = 30dB black = input -> output 1 grey = input -> output 2 CMRR -30dB.at27 Sound Performance Lab Frequency Response / THD+N 08/20/07 12:13:27 ratio +3 0.2 0.175 +2 0.15 +1 0.125 d +0 0.1 B % u 0.075 -1 0.05 -2 0.025 -3 10 20 50 100 200 500 1k 2k 5k 10k 20k 50k 200k Hz Frequency Response and THD + N ratio with -30dBu input level and
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Guarantee Guar antee, P r oduct R egistr ation All SPL products come with a two-year manufacturer’s guarantee against defects in material or assembly from the date of purchase. End users are supported in the two-year guarantee through their distribu- tor or dealer. In such cases, please contact your dealer for full guaran- tee conditions and service. Direct SPL product support requires product registration. Please fill out the guarantee card enclosed in the package legibly in printed let- ter
