Martin Audio Screen Channel User manual

Martin Audio – CINEMA SERIES
CONTENTS (ENGLISH) Page No
1 INTRODUCTION 2
2 UNPACKING 2
3 ASSEMBLY OF HORN SUPPORT 3
4 INPUT CONNECTIONS 4
5 SAFETY FIRST 4
6 SYSTEM CONNECTIONS 5
6.1 Wiring recommendations 5
6.2 Power amplifier requirements 6
7 CMX1A/CMX2A/CMX3A OPERATION 6
8 SPEAKER PLACEMENT 7
8.1 Vertical placement 7
8.2 Horizontal spacing 7
8.3 Horn aiming 8
8.3.1 Vertical Plane 8
8.3.2 Horizontal Plane 8
9 WARRANTY 9
10 TECHNICAL SPECIFICATIONS 10
MARTIN AUDIO
LONDON
The Martin Experience
All material © 2007. Martin Audio Ltd. Subject to change without notice.

1 INTRODUCTION
Thank you for purchasing a Martin Audio Cinema Series, Screen Channel
system. As film industry technology produces increasingly wide-ranging
digital sound tracks, accommodating ever more complex special effects,
traditional 2-way sound reinforcement systems are hard pushed to translate
the full movie experience to audiences in the auditorium.
Martin’s entry to cinema sound has been nothing short of revolutionary.
The adaptation of new 3-way technology by Martin’s design team, honed to
meet the real demands of cinema installation today, has resulted in the
dedicated Martin Audio Cinema Series. The core products, Screen 2, 4, 5
and Screen Sub 1 loudspeakers are built to accommodate the various
digital formats of modern film, providing the essentials of low distortion,
wide bandwidth and uniform coverage.
Martin Audio Surrounds, including the Effect 5, 3 and 3R complete the
picture.
Your screen channel system is shipped in two cartons. One carton
containing the low frequency section and the second containing the
mid/high section, bracket and hardware.
2 UNPACKING
Each Martin Screen Channel System is built to the highest standard and
thoroughly inspected before it leaves the factory. After unpacking the unit,
examine it carefully for any signs of transit damage and inform your dealer
if any such damage is found. It is suggested that you retain the original
packaging so that the unit can be repacked at a future date if necessary.
Please note that Martin Audio and its distributors cannot accept
responsibility for damage to any returned product through the use of non-
approved packaging.
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This equipment conforms to the requirements of the
EMC Directive 89/336/EEC, amended by 92/31/EEC
and 93/68/EEC and the requirements of the Low
Voltage Directive 73/23/EEC, amended by 93/68/EEC.
Standards Applied EMC Emission EN55103-1:1996
Immunity EN55103-2:1996
Electrical Safety EN60065:1993
All material © 2007. Martin Audio Ltd. Subject to change without notice.

3 ASSEMBLY OF HORN SUPPORT
The horn support (mounting bracket) supplied with your Screen system
provides a simple way to mount and install the mid/high horn on top of the
low frequency section.
The Screen 2 support (fig 1) is a two piece support, which combines a
driver plate and a U shaped support as shown. You will need to fit the
driver plate between the horn and the compression driver using the two
compression driver M6 stud fittings.
Then simply attach the plate to the Ushaped support via the 2 x M6 fixings
and then using the M8 thumbwheel/bolt attach the completed assembly to
the bass cabinet.
The Screen 4 support (fig 2) is a one piece Ushaped support that
connects to the horn section with 2 x M6 fasteners and then locates on to
the bass section with a single M8 thumbwheel. This arrangement provides
simple adjustment of both vertical and horizontal aiming angles. The horn
can also be moved backwards and forwards. In position A, the horn is
close to the screen. In position B, the horn mouth is flush with the front of
the bass enclosure.
The Screen 5 support (fig 3) is a two piece support, which combines a
saddle support and Ushaped support as shown. This combination
connects to the horn section with 2 x M6 fasteners and then to the bass
section (see inset, fig 4. on next page) using two thumbwheels at Cand D.
The kidney shape at D offers +/- 10oof horizontal adjustment. Each hole in
the saddle section provides adjustment of the vertical aiming angle of the
horn in 5oincrements.
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212mm
282mm
A B C D
70mm
180mm
Screen 4 Screen 5
Fig1. Screen 2 horn support
Fig 2. Screen 4 horn support Fig 3. Screen 5 horn support Assembled
Screen 4 Screen 5
Fig 4. Side view of Screen 4/5 support, showing mounting positions
All material © 2007. Martin Audio Ltd. Subject to change without notice.

4 INPUT CONNECTIONS
Screen systems come with input panels mounted on the side of the cabinet
for easy access and are configured as follows:
Screen 2P and Screen 4P
The Screen 2P and Screen 4P are single input passive only enclosures.
The Full Range input is on a single set of binding posts and the output for
the mid/high horn is available from the XLR connector adjacent (cable
supplied).
Screen 2/4/5B
The Screen 2/4/5B are bi amped driven enclosures. Their main inputs are
on a dual set of binding posts for both Low and High inputs and the output
for the mid/high horn is available from the XLR connector adjacent using
the cable supplied.
Screen 4T and Screen 5
The Screen 4T and Screen 5 are both tri amped enclosures. Their main
inputs are on a triple set of binding posts for Low, Mid and High inputs, the
output for the mid/high horn is available from the NL4 connector adjacent
using the cable supplied.
Note: Speaker terminal connections
Screen 2/4/5 HF connections White Wire + terminal
Grey Wire - terminal
Screen 4/5 Mid connections Brown Wire + terminal
Blue Wire - terminal
5 SAFETY FIRST
It is important that loudspeaker systems are used in a safe manner.
Please take some time to review the following points concerning safe use
of Cinema Series Screen 2/4/5 loudspeakers.
Professional loudspeakers are capable of producing extremely high sound
levels and should be used with care. Hearing loss is cumulative and can
result from levels above 90dB if people are exposed for a long period.
Never stand close to loudspeakers driven at high level.
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All material © 2007. Martin Audio Ltd. Subject to change without notice.

6 SYSTEM CONNECTIONS
System block diagrams
6.1 Wiring Recommendations
When connecting Screen systems to an amplifier, it is recommended that
the return resistance of the cable used is less than one tenth of the nominal
impedance of the system or systems in parallel. The table below gives an
indication of the maximum permissible cable runs for various conductor
cross-sectional areas driving 4, 8 and 16 ohm loads.
Conductor CSA Maximum Cable Run
4 ohms 8 ohms 16 ohms
1.5mm217m 34m 68m
2.0mm222m 44m 88m
2.5mm229m 58m 116m
4.0mm244m 88m 176m
6.0mm266m 132m 264m
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Outputs from THX / Tri amp Processor
Inputs from Processor
Outputs from Processor
Low Mid High
Screen 2/4/5B Bi amp connect
Screen 4T/5 Tri amp connecti
Screen 2P/4P Passive connect
Amplifiers
Amplifier
Amplifiers
+---+++-----+-++++
CMX1A/2A
INPUTSOUTPUTS
Inputs from Processor
Screen 2/4/5B Bi amp connection
Outputs from THX/Tri amp Processor Amplifiers
Low Mid High
Amplifiers
Amplifier
Outputs from Processor
Screen 4T/5 Tri amp connection
Screen 2P/4P Passive connection
OUTPUTS INPUTS
CMX1A/2A
All material © 2007. Martin Audio Ltd. Subject to change without notice.

6.2 Power Amplifier Requirements
Martin Audio Screen systems are designed to be used with professional
power amplifiers capable of producing 400-650 watts per channel into 4
ohms.
Lower power amplifiers than those recommended may be used if care is
taken to avoid amplifier clipping, although they will not allow the full
performance of the system to be realised. It is important to understand that
a low power amplifier driven into clipping is more likely to damage a
loudspeaker than a higher power amplifier used within its ratings. This is
because music signals have a high peak-to-average "crest" factor. When
an amplifier is severely overdriven its output waveform is clipped (its peaks
are squared off) - reducing the crest factor. In extreme cases, the waveform
can approach that of a square wave. An amplifier is normally capable of
producing far more power under these conditions than its undistorted rated
power output.
7 CMX1A/CMX2A/CMX3A OPERATION
The CMX1A cinema controller is a 3 input/6 output controller used to
optimise the performance of the Martin Audio Screen 4 bi-amped system.
The CMX2A is the corresponding controller for the bi-amped Screen 5B.
Likewise the CMX3A is the corresponding controller to the Screen 2 bi-
amped system.
The controller provides the correct crossover, delay and screen
compensation equalisation. The nominal through gain of the controller is
0dB at the centre position of the trimpot, plus and minus 6dB of gain
variation is available to optimise the relative levels of the bass and mid/high
outputs per channel. All six trimpots are accessible through the front panel.
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All material © 2007. Martin Audio Ltd. Subject to change without notice.

8 SPEAKER PLACEMENT
The following guidelines will help in providing optimal aiming and placement
to best match the perceived location of the sound to the picture on the
screen.
8.1 Vertical Placement
The mid/high horn should be mounted approx. 2/3 of the total screen height
when the screen is masked for the tallest film format. For optimum HF
transmission the MF/HF horn should be placed 100mm (4") from the
perforated screen.
8.2 Horizontal Spacing
For a 3-channel (L,C,R) system, L and R speaker channels should be
placed equidistant from centre of the screen image area, so that they are
just inside the screen area when screen is masked for the widest format
(typically 2.35:1). Acoustically transparent side masking should be used to
prevent blocking of HF when side masking is moved in for "flat" picture
format. For 5-channel systems, Left-extra and Right-extra should be placed
equidistant between Left and Centre, and Right and Centre.
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2/3 of screen height
Perforated Screen
CRCLCLR
1.85:1
2.35:1
Platform Height
2/3 of Screen height
minus
(Screen 5) 1750mm
(Screen 4) 1300mm
(Screen 2) 907mm
Rear wall behind screen
CRCLCL R
1.85:1
2.35:1
All material © 2007. Martin Audio Ltd. Subject to change without notice.

8.3 Horn Aiming
8.3.1 Vertical Plane
In typical cinemas, best coverage is usually attained by aiming the high
frequency horn at the last row of seats. In more steeply raked "stadium"
style theatres, the horns may not require any tilt at all; in these cases, care
should be taken to minimise acoustically reflective surfaces in the rear wall
and ceiling surfaces.
8.3.2 Horizontal Plane
All screen speakers should be aimed to converge at a point about 2/3 of
the length of the room.
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Seating Area
2/3 1/3
All material © 2007. Martin Audio Ltd. Subject to change without notice.

9 WARRANTY
Martin Audio Cinema Series products are warranted against manufacturing
defects in materials or craftsmanship over a period of 5 years from the date of
original purchase. During the warranty period Martin Audio will, at it's
discretion, either repair or replace products which prove to be defective
provided that the product is returned in its original packaging, shipping
prepaid, to an authorised Martin Audio service agent or distributor.
Martin Audio Ltd. cannot be held responsible for defects caused by
unauthorised modifications, improper use, negligence, exposure to inclement
weather conditions, act of God or accident, or any use of this product that is
not in accordance with the instructions provided by Martin Audio.
Martin Audio is not liable for consequential damages.
This warranty is exclusive and no other warranty is expressed or implied.
This warranty does not affect your statutory rights.
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All material © 2007. Martin Audio Ltd. Subject to change without notice.

10 TECHNICAL SPECIFICATIONS
SCREEN 2
DRIVERS 1 x 15" (380mm) low frequency
1 x 1" (25mm) exit HF compression driver
FREQUENCY RESPONSE 45Hz-20kHz ± 3dB
RATED POWER LF: 550W AES, 2200W peak
HF: 60W AES, 240W peak
SENSITIVITY LF: 98dB 1 Watt/1 metre
HF: 110dB 1 Watt/1 metre
CROSSOVER 1.2kHz
IMPEDANCE LF: 8 ohms
HF: 8 ohms
DISPERSION 90 degs horizontal x 90 degs vertical
DIMENSIONS LF: (W) 650mm x (H) 765mm x (D) 307mm
(W) 25.6ins x (H) 30.1ins x (D) 12.8ins
HF: (W) 285mm x (H) 344mm x (D) 185mm
(W) 11ins x (H) 13.4ins x (D) 7.1ins
WEIGHT LF: 39kg (86lbs)
HF: 4.5kg (9.9lbs)
SHIPPING DIMENSIONS (W) 700mm x (H) 1000mm x (D) 350mm
(W) 27.6ins x (H) 39.4ins x (D) 13.7ins
SHIPPING WEIGHT 47kg (103.6lbs)
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All material © 2007. Martin Audio Ltd. Subject to change without notice.