Martin Audio C4.8T User manual

The Martin Experience
C4.8T, C.6.8T, C8.1T
User’s Guide
All material © 2007. Martin Audio Ltd. Subject to change without notice.

All material © 2007. Martin Audio Ltd. Subject to change without notice.
Installation Guide
Martin Audio Ceiling Loudspeakers C4.8T, C6.8T, C8.1T
Description
Martin Audio C4.8T, C6.8T and C8.1T ceiling loudspeakers are all 2-way designs using
soft dome tweeters for the widest dispersion and excellent off-axis performance. All
models have perforated steel grilles, UL94 V-0 baffle materials, steel back cans and
feature rising clamp connectors that accept up to 2.5sqm conductors.
Unpacking
Thank you for purchasing a Martin Audio ceiling loudspeaker system. Every Martin
Audio product is built to the highest standard and thoroughly inspected before it leaves
the factory. After unpacking, examine the product carefully. Inform your dealer if transit
damage is found. We suggest that you retain the original packaging so that the system
can be repacked at a future date if necessary. Martin Audio and its distributors cannot
accept responsibility for product damaged through the use of non-approved packaging.
Compliance
These products conform to:
EMC Directive 89/336/EEC
Low Voltage Directive 73/23/EEC
These products comply with UL2043 Fire Tests for
Heat & Visible Smoke Release for Discrete
Products and their Accessories Installed in Air
Handling Spaces.
Listed UL1480 General Signaling Speakers.
SUITABLE FOR USE IN AIR HANDLING SPACES
See page 3 for recommended ceiling hole sizes >>

A steel cover plate with a clamped cable entry protects the input
connector against fire in accordance with BS5839: Part 8, Section
10.3.
All models are fitted with a thermal fuse to prevent the loudspeaker
from short circuiting and disabling other loudspeakers in its group
under the influence of fire.
Model Drivers Dispersion
C4.8T 4” (100mm) LF 180deg
0.75” (19mm) HF
C6.8T 6.5”(165mm) LF 150deg
0.75” (19mm) HF
C8.1T 8”(200mm) LF 90deg
1” (25mm) HF
The exceptionally wide mid-high dispersion of the Martin Audio
C4.8T and C6.8T makes them particularly suitable for low ceilings.
Voltage & power settings
All models are 16ohms direct or via line transformers selected with a
baffle-mounted switch for 100V or 70V operation as follows:
Baffle switch Baffle switch location
(C6.8T shown)
Model 16ohm 100V operation 70V operation
C4.8T 40W 25W, 12.5W, 6W 25W, 12.5W, 6W, 3W
C6.8T 75W 40W, 20W, 10W 40W, 20W, 10W, 5W
C8.1T 125W 60W, 30W, 15W 60W, 30W, 15W, 7.5W
All material © 2007. Martin Audio Ltd. Subject to change without notice.

All material © 2007. Martin Audio Ltd. Subject to change without notice.
Note that all models are protected with a PTC (positive temperature coefficient) device and
will quieten, if overdriven. The PTC device will reset itself once the signal is reduced to a
more sensible level.
Installation
Ceiling loudspeaker with C-bracket
and tile rails (foreground)
Please note carefully
Martin Audio ceiling loudspeakers must be installed by experienced ceiling
loudspeaker installation personnel using the full installation kit provided
The installer must check with all relevant local, national and international electrical,
fire and building safety authorities to ensure that all regulations are being complied
with
Every ceiling loudspeaker must be fitted with a steel safety wire between its rear
can safety tag and a suitable overhead supporting structure to provide backup
support in the event of ceiling damage
When installed in an air handling space the steel cover platesmust be sealed
to the loudspeaker back canswith firestop putty or a suitable alternative to ensure
plenum tight enclosure of the electrical connections
Step 1
Cut the ceiling hole as follows using the template provided:
C4.8T 178mm dia cut-out
C6.8T 224mm dia cut-out
C8.1T 308mm dia cut-out

Suitable hole cutting methods will depend on the ceiling structure,
local conditions, personnel, equipment etc and must be determined
by the installer.
Step 2
Place a tile rail either side of the ceiling hole and clip the C-bracket
over the upright edges of the tile rails.
Note the rail orientations –outwards for the C4.8T and C6.8T,
inwards for the C8.1T.
C4.8T & C6.8T rail orientation C-bracket clipped over rail
(rails placed outwards)
C8.1T rail orientation C-bracket clipped over rail
(rails placedinwards)
All material © 2007. Martin Audio Ltd. Subject to change without notice.

Note that the tile rail ends may be reshaped to suit your particular
ceiling structure.
Tile rail end
Step 3
Screw the C-bracket to the tile rails with the screws provided.
C-bracket screwed to tile rail
Step 4
Place the loudspeaker into the ceiling hole (and through the centre of
the C-bracket) from the underside. Align the loudspeaker so that an
imaginary line between the woofer and tweeter runs along the
corridor or concourse. This provides the smoothestsound coverage.
All material © 2007. Martin Audio Ltd. Subject to change without notice.

2-way ceiling loudspeaker orientation
Make sure that the C4.8T and C6.8T swivel-tabs do not coincide with
the C-bracket gap.
Loudspeaker in place.
Note swivel-tab positionsbefore fully tightening
It is permissible for one of the five C8.1T swivel-tabs to coincide with
a C-bracket gap in order to maintain driver orientation.
All material © 2007. Martin Audio Ltd. Subject to change without notice.

Step 5
Screw the loudspeaker to the C-bracket by tightening the screws
from the underside of the baffle.
Tightening the swivel-tab screws
Step 6
Connect your pre-installed amplifier cable to the ceiling loudspeaker.
Amplifier power input is via a 4-pin rising clamp plug providing
+ and –inputs and + and –Loop Through connections at the top
of the loudspeaker can.
Input & Loop Through connector
All material © 2007. Martin Audio Ltd. Subject to change without notice.

The input and loop connectors must be fireproofed using the steel
cover and screws provided. This cover has a 0.75” (19mm) knockout
and a clamped cable entry.
Ceiling loudspeaker rear can
–fireproof steel cover fitted
Step 7
Fit a steel safety wire between its rear can safety tag and a suitable
overhead supporting structure to provide backup support in the event
of ceiling damage.
Safety tag location
All material © 2007. Martin Audio Ltd. Subject to change without notice.

Step 8
Push the grille into position ensuring that the grille is properly located
in the baffle slots.
Locate grille tags into slots
Your Martin Audio ceiling loudspeaker is now ready for use.
Warranty
Martin Audio ceiling loudspeaker 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 its 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.
All material © 2007. Martin Audio Ltd. Subject to change without notice.