SamsonメーカーMPL 1204の使用説明書/サービス説明書
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MIXER SAMSON ® MPL 1204.
Intr oduction 3 MPL 1204 Features 3 Guided T our 5 Overview 5 Channels 6 Main Section 8 Rear Panel 11 Connecting The MPL 1204 - General Suggestions 13 Setting Up and Using the MPL 1204 15 Setting the .
Intr oduction / MPL 1204 Featur es Congratulations on purchasing the Samson MPL 1204 four-bus microphone/line mixer! The MPL 1204 is optimized for use in both live performance and recording applications, and it can be used wherever there are a number of microphone or line-level sources that need to mixed down to two or four outputs.
MPL 1204 Featur es • Electronically balanced XLR Main stereo outputs as well as an independent electronically balanced stereo Control Room output (with dedicated level control) for connection to a power amplifier and studio monitors. • A phantom power switch enables you to use the MPL 1204 with high-quality condenser microphones.
Guided T our - Over view The following illustration shows an overview of the front panel of the MPL 1204: 5 LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL MUTE 3/4 LEFT RIGHT .
Guided T our - Channels 1: Trim (black) - This knob determines the input level of the connected signal. Continuously adjustable from +4 dB to -50 dB (for mic inputs) or +24 to -30 dB (for line inputs), the input signal is boosted when the trim is turned clockwise and attenuated when turned counterclockwise.
Guided T our - Channels 7: Level (white) - This knob (purposely made a little bigger than the others so you can find it easily in low-light situations) controls the volume of the channel input. In practice, you will use the Level controls to continuously adjust the loudnesses of the various signals being blended together by the MPL 1204.
8 Guided T our - Main Section 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).
9 Guided T our - Main Section 3: Stereo Auxiliary Return Balance (brown) - These knobs determine the relative levels of the left and right input signals connected to the MPL 1204 ’ s two stereo Auxiliary returns. When the knob is placed at its center (detented) position, both left and right input signals for that Aux return are at equal strength.
Guided T our - Main Section certain that one or more connected mics require 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.
Guided T our - 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.
12 Guided T our - Rear Panel 7: Aux Returns (1/2, 3/4) - These unbalanced 1/4" TRS inputs allow you to route signal from external devices such as effects processors to either of the two stereo Aux Returns.
13 Connecting The MPL 1204 - General Suggestions The actual connections you ’ ll make to and from the MPL 1204 will vary according to the environment you use it in and the particular equipment you have. In the “ MPL 1204 Applications ” sections at the rear of this manual, you ’ ll find some suggested setups.
14 • NEVER connect a microphone and line level input to the same channel simultaneously — use one or the other. You can have some channels connected to microphones and others to line level signals.
15 Setting up your MPL 1204 is a simple procedure which takes only a few minutes: 1. Remove all packing materials (save them in case of need for future service) and decide where the unit is to be physically placed — it can be mounted in any standard 19" rack, requiring four rack spaces, or used on a tabletop.
16 You ’ re now ready to establish the correct gain structure — the key to getting the best performance from the MPL 1204, or from any mixer, for that matter.
17 Setting the Cor r ect Gain Str uctur e h. Once you ’ ve set the optimum level in step (g) above, continue playing the instrument and slowly raise the level of your power amplifier until you reach the desired listening level. Repeat step (g) above for each instrument connected to the MPL 1204 channel line inputs.
18 Gr ounding T echniques Hum and buzz are the biggest enemies you face when interconnecting a large number of different pieces of equipment to a central audio mixer.
19 Busing, Submixing and Channel Muting As we ’ ve seen, the MPL 1204 uses a system of four buses — pathways through which signal can be routed. The four MPL 1204 bus faders control the overall level of the signal being output through the four buses.
20 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.
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.
22 Using Aux Sends and Retur ns 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).
23 Using Inser ts In addition to using Auxiliary sends and returns to access outboard devices, the MPL 1204 also provides channel inserts for each of its twelve input channels.
24 PFL/AFL Soloing The MPL 1204 provides two options for soloing input signals in headphones connected to the front panel headphone jack — Pre Fade Listen ( PFL ) and After-Fade Listen ( AFL ). The Solo switch in the main section (#8 on page 7) allows you to choose between these two modes of operation.
25 Applications Here are four suggested applications for the MPL 1204; bear in mind that your particular circumstance may dictate changes in these suggested signal connections and routings. Application 1 - Using The MPL 1204 As A Recor ding Mixer The MPL 1204 is optimized for use as a recording mixer with multitrack digital or analog recorders.
26 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.
27 Application 3 - Using The MPL 1204 As A Keyboar d 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.
Applications 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.
29 Appendix A: Block Diagram SUM SUM SUM SUM LOW HIGH MID 3 BAND EQ LEVEL + H.A TRIM MIC(CH1-10) BALANCED -50dBU --- +4dBU PAN LINE (CH1-10) -30dBU INSERT (CH1-10) +4dBU AUX 2 AUX 1 AFL L BUS 1 AFL R SOLO ON/OFF PFL L PFL R B+ BUS 2 BUS 3 BUS 4 LOW HIGH MID 3 BAND EQ LEVEL + H.
30 Specifications Normal Limit 1. Frequency Response (±3 dB) Mic in to Main out DC ~ 65 kHz 20 Hz - 50 kHz Mic in to Aux Send DC ~ 65 kHz 20 Hz - 50 kHz Aux return to Main out DC ~ 160 kHz 20 Hz - 50 kHz Tape in to Main out DC ~ 65 kHz 20 Hz - 50 kHz 2.
Produced by On The Right Wavelength for Samson Technologies Corp. Copyright 1997, Samson Technologies Corp. Printed March 1997 Samson Technologies Corp.
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Samson MPL 1204を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はSamson MPL 1204の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
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