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.
C
A 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
