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.
C
O 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
