Martin M156i Manual de Usario

Martin Vocero M156i

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Installation Series
u s e r m a n u a l
r evi si o n d
M 7 2 i
M 8 2 i
M125i
M127i
M129i
M154i
M156i
M 1 5 0 2 m k 2
2 Mach Installation Series
D E S I G N C O N C E P T
The Mach Installation Series is designed
especially for fixed installations in discos,
theatres, bars etc. The Installation Series con-
sists of two different speaker types.
Medium throw top-boxes
The M127i, M129i, M154i & M156i are
designed for placement up to 20 meters (65
feet) from the listener. Horn dispersion of 90°
by 40° ensures good coverage in the horizon-
tal plane while reducing distorting reflections
from floor and ceiling in the vertical plane.
Near field top-boxes
The M72i, M82i & M125i are designed for
placement up to 10 meters (32 feet) from the
listener. Their wide 120° by 120° dispersion
allows them to be flown on either axis and
makes them ideal near field monitors in ven-
ues with low ceiling height.
Top-box frequency range
All top-boxes are tuned to work from the
upper sub-bass and up. For ideal performance
they must be supported by a subwoofer.
The idea behind this design is that in fixed
installations, the speakers are typically flown.
Flying provides less support for the audio
energy below 100 Hz, reducing the sub-bass
output. Instead of forcing the speaker to per-
form where the acoustic environment is work-
ing against it, our top-boxes are designed with
a roll off in the sub-bass. The advantage com-
pared to full-range boxes is smaller size,
higher sensitivity and power handling.
CO N N E C T I O N S
The top-boxes in the Installation Series come
standard with a passive crossover. In passive
mode they are connected with the 1+, 1- pins
on the Speakon® terminal.
For correct phase, verify that + (red) on the
amplifier is connected to 1+ on the Speakon®
terminal. Likewise, - (black) on the amplifier
must be connected to 1-.
When driven active, the woofers are con-
nected to the 1+, 1- pins and the horns are
connected to the 2+, 2- pins. Upgrading to
active mode is done by removing the Spea-
kon® terminal and re-connecting the wires.
Please refer to page 5.
C A B I N E T F E A T U R E S
Removing the grill
The cabinets in the Installation Series are
built around a solid aluminum frame. Apart
from making the cabinet very strong, the
frame is the mounting point for the grill. The
grill is made of heavy 2 mm steel with 8 mm
holes for maximum air-to-metal-ratio. The
grill is removed by inserting a cable tie or like
through the holes in the grill and pulling it
outwards. This gives access to the drive units.
Figure 1: Removing the grill
user manual 3
Rotatable horn
The M129i features a rotatable horn that
allows the speaker to be flown vertically or
horizontally. The default horn angle is for
horizontal applications. For vertical applica-
tions, rotate the horn 90° to maintain the 100°
x 70° coverage pattern.
Flying system
The M72i, M82i, and M125i are flown with
customized brackets. All other boxes - and the
M125i - are flown using M10 flying bolts
mounted into the flying points on the top and
bottom plate of the cabinets. To fly the box,
simply remove the bolts and mount the flying
bolts. The certified load for each flying bolt is
4000 kilograms (8800 pounds).
The flying points are placed so that the
speaker will fly without tilt. If tilt is needed,
wires can be connected to the rear or bottom
flying points.
The M125i 127i, & 154i have been prepared
for a top hat adapter that allows the speaker to
be placed on a tripod. The top hat adapter
must be ordered separately. Multi- and U-
brackets are available for all models except
the M154i, M129i & M156i.
H O R N P R O T E C T I O N
The horns features a thermal protection cir-
cuit that increases impedance when the cur-
rent exceeds a safe level. The increased
impedance reduces current to the horn, thus
protecting it from damage. The audible result
is lower output from the horn. When this hap-
pens, do not increase the high frequency level
on the EQ or tone control, as this may cause
damage to the protection circuit and eventu-
ally damage the diaphragm.
When the current returns to a safe level, the
protection circuit restores full signal current
to the horn, and the audio output returns to
normal.
The thermal protection is very effective as it
combines good protection with excellent
sound quality. The components in the protec-
tion circuit are all linear and thus have no
influence on the sound when not engaged.
CA B L E S
High quality cable must always be used.
Cables with high capacitance, high induc-
tance and high impedance have a strong nega-
tive influence on sound quality as well as
amplifier reliability.
We recommend the 2 x 4 mm (11 AWG) or 4
x 4 mm (11 AWG) Mach speaker cable. This
M129i, horizontal flying
M129i, vertical flying

Especificaciones del producto

Marca: Martin
Categoría: Vocero
Modelo: M156i

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