Speck MicPre 5.0 Reference Manual

Microphone preamp & mix node
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MicPre 5.0
Microphone Preamp & Mix Node
Reference Manual

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Summary of Contents for Speck MicPre 5.0

  • Page 1 MicPre 5.0 Microphone Preamp & Mix Node Reference Manual...
  • Page 3 Warranty Speck Electronics products are warranted to the original owner to be free of defects in material or workmanship. This warranty does not apply to any product subject to accident, misuse, neglect or failure to comply with normal maintenance procedures or if the serial number has been defaced, altered, or removed;...
  • Page 4: Table Of Contents

    Mechanical installation ............Physical placement of adjacent equipment ......Cleaning ................Repacking for shipment ............Basic connections to the MicPre 5.0 ........The Input / Output connectors ..........Insert jacks ................Mixoutput jacks ..............Wiring the MP 5.0 to unbalanced inputs.......
  • Page 5 Rear Panel ................. Microphone input ..............Preamp output ..............O.S.P. switch ................. Insert jacks ................Pre Out-B / Line In jacks ............. Mix output jacks ..............Mix Link connector .............. Aux DC output ..............Power switch ................ AC power inlet..............Fuse ..................
  • Page 7: Chapter 1 Introduction

    „ In this manual the MicPre 5.0 will also be referred to as the MP 5.0. The signal path consists of a matched discrete transistor front-end, premium IC's, and transformer output stage.
  • Page 8: Standard Accessories

    The ground pin of the power cord is internally connected to the chassis. For safety reasons, do not lift the ground on the power plug by using a ground lift adapter. The MicPre 5.0 should never be exposed to rain or moisture.
  • Page 9: Removing The Cover

    MP 5.0 and never operate the MP 5.0 without the cover properly installed. The MP 5.0 with its internal power supply contains voltages that can cause serious injury or death. Refer all repairs to a qualified service technician, or directly to Speck Electronics.
  • Page 10 Chapter 1 Introduction Section ~ This page left intentionally blank ~...
  • Page 11: Chapter 2 Installation

    Chapter 2 Installation Section Installation General The following information should give you the basics on how to install the MP 5.0. The proper installation of the MP 5.0 as part of a larger system requires a clear understanding of audio wiring, AC distribution, grounding, and shielding techniques.
  • Page 12: Mechanical Installation

    Chapter 2 Installation Section To avoid electrical shock, plug the MP 5.0 into a properly wired receptacle. The ground pin of the power cord is internally connected to the chassis. For safety reasons, do not lift the ground on the power plug by using a ground lift adapter. Mechanical installation The location of the MP 5.0 should be such that the operator has a clear, unobstructed view of the front panel from his/her normal...
  • Page 13: Cleaning

    Repacking for shipment If the MP 5.0 is to be shipped to Speck Electronics for service or repair, attach a tag to the product identifying the owner and indicating the service or repair to be accomplished. Include the model number and serial number of the product.
  • Page 14: Basic Connections To The Micpre 5.0

    Chapter 2 Installation Section Basic connections to the MicPre 5.0 LINE IN PRE OUT-B speck MicPre 5.0 electronics AUX DC OUT INSERT RTN INSERT SEND O.S.P . NORMAL MIX LINK MIX LEFT MIX RIGHT OUTPUT INPUT DIRECT Input / Output connectors The XL mic input and XL pre output are the primary connections to the MP 5.0.
  • Page 15: Wiring The Mp 5.0 To Unbalanced Inputs

    A selection of standard and custom interface cables used to link the MP 5.0’s are available from Speck Electronics or may be assembled using standard 8 pin RJ45 modular plugs and 4 conductor cable.
  • Page 16: Connecting The Mp 5.0 To The Asc Equalizer

    Model ASC EQ With only a few simple connections, the MP 5.0 can be combined with the Speck Electronics "Model ASC" 4 band equalizer to form a single channel strip. The following illustration shows how to interface the ASC equalizer to the insert send/return jacks of the MP5.0 and how to power the ASC...
  • Page 17 PRE OUT-B speck CAUTION LINE IN PRE OUT-B speck OPEN OR EXPOSE TO RAIN OR MOISTURE. OPEN OR EXPOSE TO RAIN OR MOISTURE. MicPre 5.0 MicPre 5.0 electronics electronics AUX DC OUT AUX DC OUT 115V (.2A) 115V (.2A) 230V (.1A) 230V (.1A)
  • Page 18: Interfacing More Than Two Mp 5.0'S

    PRE OUT-B speck CAUTION LINE IN PRE OUT-B speck OPEN OR EXPOSE TO RAIN OR MOISTURE. OPEN OR EXPOSE TO RAIN OR MOISTURE. MicPre 5.0 MicPre 5.0 electronics electronics AUX DC OUT AUX DC OUT 115V (.2A) 115V (.2A) 230V (.1A) 230V (.1A)
  • Page 19: Interfacing Two Mp 5.0'S

    PRE OUT-B speck CAUTION LINE IN PRE OUT-B speck OPEN OR EXPOSE TO RAIN OR MOISTURE. OPEN OR EXPOSE TO RAIN OR MOISTURE. MicPre 5.0 MicPre 5.0 electronics electronics AUX DC OUT AUX DC OUT 115V (.2A) 115V (.2A) 230V (.1A) 230V (.1A)
  • Page 20 Chapter 2 Installation Section ~ This page left intentionally blank ~...
  • Page 21: Chapter 3 Operation

    Operation General In this section we hope to give you basic information on the operation of the MicPre 5.0 and adequately describe its controls, switches, and connectors. The information in this section of the manual is intended to help with the technical process when using your MP 5.0. Words alone could not adequately describe how to adjust the controls for every situation you might encounter with the MP 5.0.
  • Page 22: Front Panel Controls

    Chapter 3 Operation Section Front Panel Controls This 11 position rotary switch adjusts the mic gain in 5dB steps 1. Gain switch from +10dB to +60dB. When the Mic/DI switch is selected for D.I., the gain range is from -10dB to +40dB in 5 dB steps. 2.
  • Page 23: Phantom Switch

    Chapter 3 Operation Section 6. 48V Phantom The phantom switch supplies a DC voltage of +48 volts to pins 2 and 3 of the XL mic input connector for powered microphones that do not use their own external power supply. A red LED indicates the operation of the phantom power.
  • Page 24: Filter Bypass Switch

    MP 5.0. The Mix Section The mix section of the MicPre 5.0 provides a separate left and right mix output with level, pan and mute. The source of the mix level may be the mic input, the DI input, or any line level signal that is connected to the line in jack on the rear panel.
  • Page 25: Mix Level Control

    Chapter 3 Operation Section 13. Mix level control This control adjusts the level being sent to the mix outputs. The operation of this control does not affect the signal at the main XL output connector. Level Level The pan control allows the mix 14.
  • Page 26: Rear Panel

    This microphone input XL connector is used to connect a low impedance microphone. The mic input is selected with the Mic/DI switch on the front panel. Before speck MicPre 5.0 electronics connecting your microphone, it is recommended to set the O.S.P.
  • Page 27: O.s.p. Switch

    Chapter 3 Operation Section 18. O.S.P. The Output Signal Path (O.S.P) switch gives you the choice of two (Output Signal Path) paths for the signals originating at the mic or D.I. inputs and exiting at the XL preamp output. When set to the “Normal” position, the mic or D.I. signal will pass through the main preamp stage, the insert send and return jacks, and high pass filter section before passing to the XL output connector.
  • Page 28: Insert Jacks

    Chapter 3 Operation Section 19. Insert Send and The MP 5.0 provides balanced TRS insert send and return jacks for Insert Return jacks line level interstage access after the mic preamp stage and before the high pass filter section. The insert jacks may be used to connect limiters or equalizers. The Insert Send jacks are wired as shown below in Figure 10.
  • Page 29: Pre Out-B / Line In Jacks

    Chapter 3 Operation Section The signal flow diagram below (Figure 12) shows two separate signal paths with the "mic to pre out" shown in a dashed line and the "line in to mix out" as a solid bold line. "Line In to Mix Out" signal path "Mic input to Pre Out"...
  • Page 30: Mix Link Connector

    This connector is available to provide a source of dual regulated 23. Aux DC output connector DC voltage to the Speck ASC equalizer and future Speck products. An optional DC interface cable (p/n ASC-DCI) and instructions for connection are available from Speck.
  • Page 31: Specifications

    Chapter 3 Operation Section Specifications Gain Range (Mic) +10 to +60dB in 5dB steps 70 dB total -10/+10 variable trim Gain Range (D.I.) -20 to +40 dB in 5 dB steps .002% nominal THD+n (Gain +40, Output +12dBu) Noise EIN (22Hz-22kHz) -126 dBu (150 ohm load, 60dB gain) Freqency Response...
  • Page 32: Chapter 4 Wiring And Other

    Wiring & Other General The following information is not specific to the operation of the MicPre 5.0, but rather general information regarding the “care and feeding” of an audio system. A general discussion about AC, AC grounding, audio grounding, EMI, and quality wiring is discussed in this section. These...
  • Page 33: Ac Distribution And Safety

    Chapter 4 Wiring and Other AC Distribution and Safety Proper AC grounding When you are evaluating voltage and current requirements for your audio system, it is important that your MP 5.0 and/or audio system does not exceed the capacity of your AC service. You should make certain that the earth (green) wire for the AC system makes a reliable earth connection, and determine as best as possible that the AC system is free of noise that could generate unwanted audible...
  • Page 34: Audio Earth

    Chapter 4 Wiring and Other Given the same circumstances, if the AC safety ground has been defeated with a ground lift or the AC service is incorrectly wired, the equipment's chassis and quite possibly everything attached in that rack would be "live" with 120 volts. In an electronics context, an earth provides a path for unwanted Audio earth EMI noise to be carried away from your audio equipment.
  • Page 35: Sources Of Emi

    Chapter 4 Wiring and Other EMI and RFI The occurrence of EMI (Electro Magnetic Interference) and RFI (Radio Frequency Interference) in a contemporary studio system should be of great concern and not overlooked when installing the MP 5.0. EMI is defined as any unwanted signal which adversely affects the operation of the MP 5.0 or your audio system.

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