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Sound Performance Lab 9844 manual

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Table of contents for the manual

  • Page 1

    Model 9844 Manual V acuum T ube Microphone Preamplifier[...]

  • Page 2

    By Hermann Gier and W olf gang Aichholz V ersion 1.4 - 5/2000 The information in this document has been carefully verified and is assumed to be correct. Howev er Sound Performance Lab (SPL) reser v es the right to modify the product described in this manual at any time. Changes without notice. This document is the propert y of SPL and may not be co[...]

  • Page 3

    3 Co n t e n t s F oreword .................................................................................................. 3 Introduction ............................................................................................ 4 Hookup ..................................................................................................... 5 Ins[...]

  • Page 4

    4 The GoldMike is another jewel in the SPL T ube series. Like all SPL tube processors , the GoldMike combines the unique sonic qualities of tube technology with state-of-the-art manufac turing, meti- culous component selection and high-tech conception. This latest pr oduc t, a dual-channel tube microphone preamplifier with superb sonic qualities, i[...]

  • Page 5

    5 Carefully select a place for setting up the GoldMik e. The unit should be situated awa y from heat sources and direct sunlight. A void installing y our GoldMik e in environments exposed to vibra- tions, dust, heat, cold or moisture . Keep the unit away from trans- formers or motors or any other unit that c ould generate large variations in pow er[...]

  • Page 6

    6 The following graph shows the correct wiring for connecting un- balanced signals to the balanced XLR connectors. VERY IMPORTANT Phantom power must be switched off before unbalanced signals are connected! Otherwise short circuits cause damages! Built around a torroidal transformer , the power supply allows f or a minimal electromagnetic field with[...]

  • Page 7

    7 Adv antages of the SPL dual-stage preamplifier The GoldMike's engine is the newly designed SPL dual-stage preamplifier . During the first stage of amplification the signal is amplified by a semi-conductor circuit while the second stage applies tube electronics. We achiev e a high common-mode-r ejec- tion by using laser trimmed components. Li[...]

  • Page 8

    8 Sound optimization already during r ecording: FLAIR circuitry The FLAIR circuitry enhances the presence of vocals and acoustic instruments, FLAIR makes these elements cut better through a mix. It has proved to be superior in double-blind tests. Once a signal completes the semi-conductor amplification stage, it is then split and fed into the tube [...]

  • Page 9

    9 C ontrol elemen ts The MIC GAIN knob controls the input signal's amplific ation. The range extends to 72 dB of gain. The levels should be adjusted f or a meter reading around 0 VU to get the best signal-to-noise per for- mance. Please note that the meters show only an rms/average level, so keep your GoldM ike from pegging the meters' ne[...]

  • Page 10

    10 HIGHP ASS 5 F ilters problematic frequen- cies (rumble, etc.) Tips on how to use the phase reverse 30 dB pad By pressing the REVERSE button, you invert the microphone's polarity . When the REVERSE button is released (status LED off ) the signal is in phase. Pressing it switches the signal out-of-phase (LED on). Reasons for rev ersing the ph[...]

  • Page 11

    11 T rue to SPL's philosophy , the GoldM ike features the sound enhan- cing FLAIR circuitr y . More than simply a frequenc y-range manipu- lating tool, the FLAIR circuitr y is also a timebase shif ting (phase) device that enhances a sound's harmonic content. The close rela- tion between frequency- and amplitude-timebase and the source sig[...]

  • Page 12

    12 Audio F requency Response: ...................................... 10 Hz - 100 kHz, +/- 0.5 dB Common-Mode-Rejection at -20 dBu: ...... 1 kHz: -80 dBu ... 10 kHz: -73 dBu Harmonic Distortion Input level Gain THD -30 dB ................................... 30 dB ................... 0.175 % -60 dB ................................... 60 dB ..........[...]

  • Page 13

    13 Wa r r a n t y SPL electronics GmbH (hereaf ter called SPL) products are warranted only in the country where purchased, through the authorized SPL distributor in that country , against defects in material or workmanship. The specific period of this limited warranty shall be that which is described to the original retail purchaser by the authoriz[...]