S
ETTING
-
U
P
T
HE
M
ODEL
S
EVEN
Unless the high-pass crossover is built into the electronics, (see page 3) the M5-HP
crossover is required in all systems. Using the speakers without a properly config-
ured M5-HP crossover in place will cause severe and costly non-warranty damage to
the midbass drivers.
T
HE
M5-HP C
ROSSOVER
The Model Seven uses a unique crossover and sub-
woofer amplification configuration to provide the true
benefits of bi-amplification and reduce the current de-
mands on the main amplifier. By inserting a passive high-
pass crossover between the preamplifier and the main
amplifier then connecting the Model Sevens like conven-
tional bi-wired speakers, the main amplifier remains in the
signal path to the subwoofer, but its current demands are
reduced. This insures sonic continuity as the main ampli-
fier’s characteristics that are evident through the upper fre-
quencies are maintained to the deepest bass, but with the
power and control of the Model Seven’s internal 400 watt
amplifier.
The M5-HP is the high pass crossover for the mid-bass
driver and must be installed in the system between the pre-
amplifier and power amplifier before the Model Sevens are
used. (The only exception is in systems with a high-pass
amplifier as noted below.) Properly configured to match the
input impedance of the amplifier, the M5-HP will roll off
the low frequencies going to the amplifier so that they are
-3db at 100Hz referenced to 1kHz. To compensate for the
low-frequency roll-off induced by the crossover, the re-
sponse of the Model Seven’s amplifier is contoured to re-
store the low frequencies to the proper level as shown in the
illustrations to the left. The M5-HP is a totally mono de-
sign, two are required for a stereo pair of Model Sevens.
M5-HPs are available in both balanced and single ended
configurations to match any system.
C
ONFIGURING
T
HE
M5-HP C
ROSSOVER
Before you use the M5-HPs, each unit’s internal set of
ten dip switches must be set to match the input impedance
of your main amplifier. Information on your amplifier’s
input impedance should be in its manual or available from
its manufacturer.
If you do not have accurate information
on your amplifier’s input impedance, do not use your
Model Seven speakers until you get the information or
have a competent technician determine the input imped-
ance by the method described on the next page.
With
balanced amplifiers, the M5-HP crossover must be set to
match the sum of the positive and negative legs of the input.
(The individual legs must each be exactly one half the im-
pedance.) If the individual legs do not both have the same
These examples show the interaction between the external cross-
over, the main amplifier and the Model Seven subwoofer section.
20 60 100 140 180 220 260 HZ
Response of the main amplifier and mid-
bass driver with the low-frequency roll-off
induced by the external crossover.
Output of the Model Seven amplifier. The
contour is the opposite of the low frequency
roll-off induced by the crossover.
Response of the Model Seven’s sub-
woofer. The contour in its amplifier
boosts the frequencies below the cross-
over point back to flat and rolls-off the
subwoofer above the crossover point.
Superimpose the response of the Model
Seven subwoofer over the response of the
midbass driver and the crossover point is
evident.
Midbass
Driver
Model Seven
Subwoofer
Midbass
Subwoofer
Combined
Response
V
ANDERSTEEN
A
UDIO
2
True balanced amplifiers will have the same impedance value on the positive and
negative legs of the inputs. An amplifier with different impedance values on the posi-
tive and negative legs of the inputs is not truly balanced and is not compatible with
the balanced version of the M5-HP crossover.
