Samson MPL 1204 Owner's Manual
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Samson MPL 1204 Owner's Manual

Samson MPL 1204 Owner's Manual

Samson owner's manual mixer mpl 1204
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SAMSON
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MPL 1204

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Summary of Contents for Samson MPL 1204

  • Page 1 MIXER SAMSON ® MPL 1204...

  • Page 2: Table Of Contents

    PFL/AFL Soloing 24 Applications Notes 25 Using The MPL 1204 As A Recording Mixer 25 Using The MPL 1204 As A Main Live Mixer 26 Using The MPL 1204 As A Keyboard Submixer 27 Linking The MPL 1204 With Other Mixers 28...

  • Page 3: Introduction

    Although the MPL 1204 is designed for easy operation, we suggest you first take some time to go through these pages so you can fully understand how we’ve implemented a number of unique features.

  • Page 4: Mpl 1204 Features

    • Bus inserts allow external signals to be submixed into any or all of the four buses and also enables linking of multiple mixers. • The MPL 1204 can be mounted in any standard 19" rack (taking four rack spaces), making it easy to integrate into any existing system.

  • Page 5: Guided Tour

    The following illustration shows an overview of the front panel of the MPL 1204: CH 1 CH 2 CH 3 CH 4 TRIM TRIM TRIM TRIM HIGH HIGH HIGH HIGH AUX 1 AUX 1 AUX 1 AUX 1 AUX 2...
  • Page 6 Soloing will be in either PFL (Pre Fade Listen) or AFL (After Fade Listen) mode, depending upon the setting of the PFL/AFL switch in the MPL 1204 main section. See #7 and #8 on page 7 and the “PFL/AFL Soloing” section on page 22 in this manual for more information.
  • Page 7 In practice, you will use the Level controls to continuously adjust the loudnesses of the various signals being blended together by the MPL 1204. The “0” (2 o’clock) position of the knob indicates unity gain (no level attenuation or boost).
  • Page 8 BUS 4 1: Auxiliary Return Level (orange) - These knobs determine the input level of signal arriving via the MPL 1204’s two stereo Auxiliary returns. The “0” (2 o’clock) position of each knob indicates unity gain (no level attenuation or boost).
  • Page 9 MPL 1204 is in PFL mode (see #8 below). The left center LED (labeled “AFL”) lights steadily red when the MPL 1204 is in AFL mode (see #8 below). The right center LED lights steadily green when the Phantom Power switch (see #9 below) is engaged and 48 volts phantom power is being delivered to all XLR mic connectors.
  • Page 10 48 volts phantom power, leave this switch off (its out position). 10: Meter switch - When out, the ten-segment MPL 1204 meter (see #6 on the previous page) shows the continuous output level of Bus 1-2; when pressed in, the meter shows the continuous output level of Bus 3-4.

  • Page 11: Rear Panel

    1: Power on-off switch - As you may have guessed, this is what you use to turn the MPL 1204 on and off. To avoid potential damage to your speakers, turn the MPL 1204 on before you turn on any connected power amps—and turn it off after the power amps are turned off.
  • Page 12 9: Tape/CD inputs (L, R) - Use this set of dual RCA jacks to connect the outputs of a tape or CD player to the MPL 1204. When the “Tape” switch (see #11 on page 8) is pressed in, signal connected here is routed to channels...

  • Page 13: Connecting The Mpl 1204 - General Suggestions

    Here are a few basic rules concerning MPL 1204 connections that will apply in most situations: • In general, it’s best to make all connections with the MPL 1204 and any connected power amplifiers turned off. If you must make connections with...
  • Page 14 RING (SEND) SLEEVE (GROUND) • The MPL 1204 Aux return jacks are unbalanced stereo inputs, with the tip carrying the left input signal and the ring carrying the right input signal (with the sleeve carrying common ground), as shown below. Insertion of a monophonic 1/4"...

  • Page 15: Setting Up And Using The Mpl 1204

    (you’ll usually connect the Main output to a power amp in live performance environments and the Control Room output to a power amp when using the MPL 1204 for recording). It is never a good idea to power up any amplifier that is not connected to loudspeakers.

  • Page 16: Setting The Correct Gain Structure

    (such as passive DI boxes) from the XLR mic jacks. ** If you’re using an instrument such as electric guitar or bass, we recommend that you connect it to the MPL 1204 with a direct injection box to ensure correct impedance.
  • Page 17 MPL 1204 Aux sends. The idea is to drive these devices as hot as possible (short of overloading them) and then to use the corresponding Aux return level to carefully adjust the amount of processed signal being blended with the dry signal.

  • Page 18: Grounding Techniques

    AC/DC adapters. If you’re using the MPL 1204 in a fixed location such as a recording studio, you may want to invest the time and money into creating a star ground network. This is by far the best technique for avoiding grounding problems.

  • Page 19: Busing, Submixing And Channel Muting

    For example, you may want to connect the MPL 1204 to a four-track cassette or open-reel tape recorder. One good way to do this is to route each of the four individual bus outputs to a tape input, and to bring each of the four tape outputs back to individual channels.

  • Page 20: Using Pan

    Using Pan The final Main output of the MPL 1204 is stereo—that is, there are two discrete Main output jacks (and two discrete Control Room output jacks), labeled “left” and “right,” which will normally be routed to two discrete speakers.* Because of this, you will usually be working with a stereo field that ranges from hard left to hard right.

  • Page 21: Using Equalization

    One of the most exciting aspects of using a mixer such as the MPL 1204 is the ability to shape a sound, using a process called equalization. But there are few areas of sound engineering more misunderstood than equalization, and, just as good EQ can really help a sound, bad EQ can really hurt it, so read on...

  • Page 22: Using Aux Sends And Returns

    MUTE BALANCE The MPL 1204’s two Auxiliary sends allow you to combine the signal from multiple channels and send the resulting mix to external devices such as effects processors. When an Aux send knob is at its 2 o’clock “0” position, the signal is routed with unity gain (that is, no boost or attenuation).

  • Page 23: Using Inserts

    BUS INSERTS UNBALANCED 75 +4dBu See the “Linking the MPL 1204 With Other Mixers” Application on page 26 in this MIXER LINKING manual for more information. All MPL 1204 insert jacks accept 1/4" TRS plugs, with the ring carrying the send signal and the tip carrying the return signal;...

  • Page 24: Pfl/Afl Soloing

    The main function of PFL is to allow you to check that a signal is actually arriving at a particular input. When the MPL 1204 is in PFL mode and a channel Solo switch is pressed in, the pre-fader (but post-eq) signal of that channel alone is routed to the headphone output.

  • Page 25: Using The Mpl 1204 As A Recording Mixer

    Application 1 - Using The MPL 1204 As A Recording Mixer The MPL 1204 is optimized for use as a recording mixer with multitrack digital or analog recorders. As shown in the illustration below, microphones and line level signals are connected to various channel inputs. Signal processors are connected to Aux sends and returns and to channel inserts as required, with Aux send 1 (which is pre-fader) driving a headphone amplifier for cue mixes.

  • Page 26: Using The Mpl 1204 As A Main Live Mixer

    Application 2 - Using The MPL 1204 As A Main Live Mixer Here, the MPL 1204’s Main output is connected to the input of a power amplifier, and, from there, to PA speakers. Microphones and line level signals are connected to various channel inputs, and a two-track tape deck is connected to the Tape/CD inputs.

  • Page 27: Using The Mpl 1204 As A Keyboard Submixer

    Application 3 - Using The MPL 1204 As A Keyboard Submixer Here, various keyboards and MIDI tone generators are connected to the channel line inputs of the MPL 1204. Signal processors are connected to Aux sends and returns and to channel inserts as required. The Main output can then be routed to a stereo input channel of a live performance or recording mixing console, with the performer having complete control over the blend of signals being provided to the sound engineer.

  • Page 28: Linking The Mpl 1204 With Other Mixers

    Application 4 - Linking The MPL 1204 With Other Mixers The provision of four rear-panel Bus inserts makes it easy to link multiple MPL 1204s or to link the MPL 1204 with other mixers, without the need to use up channel line inputs. As shown in this illustration, simply connect the main output of another mixer to one or two MPL 1204 Bus inserts (use two for stereo linking).

  • Page 29: Appendix A: Block Diagram

    PHANTOM SOLO Appendix A: Block Diagram...

  • Page 30: Specifications

    Specifications 1. Frequency Response (±3 dB) 2. Total Harmonic Distortion (20 Hz to 20 kHz, with 30 kHz LPF) 3. Signal to Noise Ratio (30 kHz LPF) 4. Maximum Voltage Gain (Trim min/max) 5. Residual Noise (with 30 kHz LPF, EQ center, Trim min) 6.
  • Page 31 Produced by On The Right Wavelength for Samson Technologies Corp. Copyright 1997, Samson Technologies Corp. Printed March 1997 Samson Technologies Corp. 575 Underhill Blvd. P.O. Box 9031 Syosset, NY 11791-9031 Phone: 1-800-3-SAMSON (1-800-372-6766) Fax: 516-364-3888...

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