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Manual Premium Mic Pre Model 2712 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.
Contents Important Security Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Hook Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Scope Of Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 connections can lead to health risks and equipment damage.
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, disconnect ALL the power connections of other machines and antenna and phone/internet cables which may be interconnected so that no lightning damage or overload results from such secondary connections.
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 website http://www. soundperformancelab.com.
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 preamplifier. Sometimes signals have to be boosted by a factor of 2000 or more.
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XLR Sockets, Transformers, Channel Split Rear Panel/Connections XLR Sockets Connect your microphone to the transformer balanced XLR input. The Output 1 of the Premium Mic Pre is transformer balanced, too. Output 2 is electronically balanced. You can use both XLR outputs simultaneously. XLR pin wiring: Pin 1 = ground Pin 2 = hot (+) Pin 3 = cold (-) 0VUQVU CBMBODFE VOCBMBODFE The illustration shows the correct pin wiring of the balanced XLR sockets if an unbalanced wiring is required.
Control Elements Mic Gain .*$ ("*/ E# Mic Gain, About Leveling With the Mic Gain control you can regulate the preamplification of the microphone signal. It ranges from +12 dB to +80 dB. The input stage can handle input levels of up to 10 dB. The value set with the Mic Gain control defines the output level equally for both Output 1 and Output 2.
VU Meter, PPM, -10 dB Control Elements VU Meter 10 20 The VU meter displays the output level of the preamp. The gauge indicates levels from -20 dB to +5 dB. If necessary you can lower the sensitivity by 10 dB so that the gauge goes up to +15 dB output level (see “-10dB” below and “About Leveling” on the previous page). % 0 7 5 30 50 3 1 0 70 100 100 SIG An especially interesting feature is the option to switch between two display modes: VU mode and PPM mode.
Control Elements 48 V Phantom Power Supply, Pad 48 V Phantom Power Supply 7 The Premium Mic Pre provides 48 volt phantom power for microphones 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 Premium Mic Pre continuously delivers precisely 48 V and a maximum current of 14 mA, which will power all microphones.
Phase Reverse, High Pass Filter Control Elements Phase Reverse With the phase reverse button you invert the polarity of the microphone signal. When not pressed (button is not illuminated) the polarity 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 microphone or the microphone cable.
Technology Triple Stage Preamp, Stage 1 – The Input Transformer Triple Stage Preamp The preamplifier circuitry of the Premium Mic Pre is composed of three stages: a transformer, a discrete differential amplifier stage and an instrument preamplifier all contribute (in different shares) to the main amplification. The three stage setup firstly ensures a load distribution that minimizes the risk of overloads.
Stage 2 – The Discrete Differential Amplifier Technology Even a voltage that has accidentally or through technical failure been connected to a ground line cannot be transmitted. So transformers can exclude even mishaps or problems in an installation reaching the categories “improbable” till “unbelievable” ... Further, the phantom powering of microphones does not require any condensers in the preamp socket which has further sonic advantages.
Technology Stage 3, Capacitors, Output Stages, Channel Split Stage 3 – The Instrumentation Amplifier An instrumentation amplifier is following the discrete differential amplifier to produce the output signal’s voltage. Functionally a summing amplifier it eliminates possible disturbing voltages and also contributes to the main amplification with an additional +6 dB. Foil and Styroflex Capacitors Only the best MKP and styroflex capacitors are used in the various circuits.
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Specifications Audio Frequency Range 10 Hz- 68 kHz (-3 dB) CMRR -87 dBu (at 1kHz with -30 dBu input level and 30 dB Gain) THD & N @ 1 kHz Input Level -30 dBu -60 dBu Noise Gain 30 dB 60 dB THD & N 0,0071% 0,078% Gain 80 dB 60 dB 30 dB Noise Level (A-wtd.) -48,3 dBu -64,2 dBu -89,0 dBu E.I.N. (Equivalent Input Noise) -128,3 dBu Dynamic Range 111,0 dB Input XLR connector, transformer balanced Impedance unbalanced ca. 2,0 kOhm Impedance balanced ca. 4,0 kOhm max.
Measurements Sound Performance Lab CMRR 08/20/07 12:03:48 -50 -60 d B u -70 -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 ratio 08/20/07 12:04:29 +3 0.2 0.175 +2 0.15 +1 d B u 0.125 +0 0.1 0.075 -1 0.05 -2 0.
Block Diagram 20 RackPack: Premium Mic Pre
Guarantee Guarantee, Product Registration 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 distributor or dealer. In such cases, please contact your dealer for full guarantee conditions and service. Direct SPL product support requires product registration.
