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M 8 MIXER






M 8 MIXER




MANUAL


















Operation Manual V1.0
Copyright 1998
Professional Sound Corporation Printed in the U.S.A.


Introduction


Professional Sound Corporation is a leading manufacture and distributor of
professional audio products for the film and video industries. Since 1986, Professional
Sound Corporation has provided excellence in product engineering, assembly and
service. Many Professional Sound Corporation product innovations originated from our
customer's ideas based upon their own field equipment requirements. With the help of
our many valued customers, we are continually developing new and more efficient
products to add to our line. Our products cover virtually every aspect of the production
audio for film and video. These products include: audio mixers, boom poles, phone
interfaces, RF antennas, microphones, microphone power supplies, distribution
amplifiers, equipment carts, cables adapters and more.


At Professional Sound Corporation, we believe that you, our customers, are our
most important asset. We continually strive to offer you superior product support both
before and after the sale. Our staff is always available to assist you in any way
possible. We want you to feel free to call upon us anytime for product information,
dealer location or simply to offer you comments or suggestions regarding the
Professional Sound Corporation product line. Additionally, our world wide network of
dealers have been carefully chosen to provide you with the best possible product
support.


In addition to our own line of products, Professional Sound Corporation is a
Master Distributor for the Electro-Voice line of Broadcast Microphones. These
exceptionally rugged microphones are used extensively throughout the ENG, television
and radio industries and have set the standards by which others are judged.


Finally, Professional Sound Corporation is the exclusive U.S. distributor for the
van den Bergh line of carbon fiber boom poles. Due to a combination of superior
strength, rigidity and light weight construction, VDB have become number the one
boom pole sold in America for nearly a decade.

You may contact us at:


Professional Sound Corporation
28085 Smyth Drive
Valencia CA 91355

PHONE (661)295-9395
FAX (661)295-8398


E-mail sales@professionalsound.com
Homepage www.professionalsound.com

Copyright 1998 Professional Sound Corporation, all rights reserved, no portion of this manual may be
reproduced or used for commercial purposes without the express written permission of PSC. Entire
contents, descriptions, specifications and photos are the exclusive property of PSC. PSC, the PSC logo,
and M8 are registered trademarks Professional Sound Corporation.

TABLE OF CONTENTS

1.
DESIGN
OVERVIEW
PAGE
1

2. INPUT
SECTION:

2.01
TRANSFORMER
INPUTS
PAGE
2
2.02
MICROPHONE
POWER
PAGE
2
2.03
INPUT
LEVELS PAGE
3
2.04
PHASE
REVERSAL
PAGE
3
2.05
PREAMP
GAIN PAGE
4
2.06
HI
PASS
FILTERS
PAGE
4
2.07
LIMITERS
PAGE
4
2.08
EQUALIZATION
PAGE
4
2.09
CHANNEL
ASSIGNMENTS
PAGE
5
2.10
CHANNEL
FADER
PAGE
5
2.11
AUXILARY
ASSIGNMENTS
PAGE
5
2.12
PRE
FADER
LISTEN
PAGE
5

3. OUTPUT
SECTION:

3.01
BALANCED
OUTPUTS
PAGE
6
3.02
AUXILARY
OUTPUTS PAGE
6
3.03
MIXER
HEADPHONE
OUTPUT
PAGE
6
3.04
BOOM
HEADPHONE
OUTPUTS
PAGE
7
3.05
DIRECTOR
HEADPHONE
OUTPUT
PAGE
8
3.06
REFERENCE
OSCILLATOR
PAGE
8
3.07
SLATE
MICROPHONE PAGE
8
3.08
PRIVATE
LINE PAGE
9
3.09
BOOM
COMMUNICATIONS
PAGE
9
3.10
REMOTE
ROLLS
PAGE
10
3.11
TAPE
RETURNS
PAGE
10
3.12
LITTLITE
TM
PAGE
10

4. POWERING:

4.01
INTERNAL
BATTERIES
PAGE
11
4.02
EXTERNAL
POWERING
PAGE
11
4.03
RECHARGEABLE
BATTERIES
PAGE
11
4.04
GROUNDING
PAGE
12
4.05
OVERLOAD
PROTECTION
PAGE
12

5. METERING:

5.01
METER
STANDARDS PAGE
12 5.01
LCD
METERS
PAGE
13





6. MONITOR
SPEAKERS:


6.01
POWER
AMPLIFIERS PAGE
13
6.02
INTERNAL
SPEAKERS
PAGE
13
6.03
EXTERNAL
SPEAKERS
PAGE
14
6.04
DRIVING
EXTERNAL
AMPLIFIERS
PAGE
14

7. CONSTRUCTION:

7.01
CHASSIS
PAGE
14
7.02
CIRCUITRY
PAGE
15
7.03
COMPONETRY
PAGE
15

8.
MODIFICATIONS








8.01
MIXER
MODIFICATIONS
PAGE
15

9. CONNECTORS

9.01
CONNECTOR
PIN
OUTS
PAGE
16

10.
SPECIFICATIONS
PAGE
17



























INPUT SECTION:

2.01 TRANSFORMER INPUTS

The M8 mixer uses a transformer coupled input preamp design topology. Transformer
coupled inputs were chosen for their "forgiving" abilities in field production. First and
most importantly, they provide a high level of galvanic isolation which simply stated,
means your equipment and you may live should the M8 inputs come into contact with
incompatible sources (high voltages!). Secondly, because they provide this isolation,
transformer coupled inputs are inherently less susceptible to ground loop induced hum.
Lastly, transformers, if properly applied provide pleasing sound characteristics.

The transformers used in the M8 Mixer feature a 1:4 step up ratio and six sided Mu
Metal shielding. Additionally, they are printed circuit board mounted types and thus, do
not suffer from unshielded, noise sensitive leads common to the transformers used in
other mixers. All transformers are tested prior to being inserted and soldered to the
printed circuit boards. It should also be noted that the transformers are operated well
below their design limits in order to provide improved sound quality and performance.


2.02 MICROPHONE POWER:

The M8 Mixer provides all standard types of condenser microphone powering. The
front panel mounted three way selectable switch allows the user to select "12T",
"Dynamic" or "48PH" All microphone powering provided by the M8 Mixer is well
regulated, filtered and meets or exceeds DIN specifications.

"12T" or Tonador powering is an older standard favored in Hollywood before the days
of efficient DC to DC converters. Though none of the newest microphone designs
operate on "12T", many older microphones as well as existing designs such as the
Sheops CMC4 tm and the Sennheiser MKH416T tm continue to be manufactured and
represent a substantial part of the microphone market. In the past, "12T" existed under
two standards. The first standard, popular in the USA, was called none other than
"standard phase". Standard Phase refers to the 12Vdc operating voltage being applied
between pins 2 and 3 with pin 2 being positive with respect to pin 3. To the best of our
knowledge, this standard was adopted by Sennheiser for all new microphones shipped
in the USA. The second and less popular standard of "12T' microphone powering is
referred to as "red dot". Microphones wired to operate on "red dot" are wired so that
pin 3 is positive with respect to pin 2. Additionally, it was a practice in Hollywood to
paint the Sennheiser case retaining screw "red" as to identify the microphone as being
wired to red dot standards. In 1992, the Audio Engineering Society formally announced
that "Standard Phase" would from that day forward be accepted and used. The A.E.S.
standards also refer to a positive pressure transient applied to a microphone traducer
causing a resulting positive voltage output signal on pin 2. Enough trivia, the M8 mixer
delivers "12T" to the A.E.S standards of pin 2 positive. Owners of "red dot" wired microphones can easily power them from the M8 Mixer using a phase inverting barrel
(PSC part # FPSC0010C) or a phase reversing cable (PSC part # FPSC1017).




Page 2
Dynamic of "DYN" powering actually refers to no power being supplied. It is used with
all dynamic microphones such as those from Electro-Voice, Sennheiser, Shure, and
others. The mixer should also be set to "DYN" when ever a line level input is
connected such as a wireless receiver, lavilier microphones with barrel style supplies,
disc players or another mixer.

48 Phantom or "48PH" has