Some preamplifiers, power amplifiers, integrated am-
plifiers and multi-channel processors can be configured
by the user or the manufacturer to provide the low-
frequency roll-off required by the Model Sevens. Incor-
porating the high-pass crossover into the system elec-
tronics eliminates the need for M5-HP crossovers.
3 Model Seven Operation Manual
The high-pass section of the applicable unit must be con-
figured to these specifications:
Frequency Response: -3db at 100Hz
6db per octave (First order)
As you set up your Model Sevens, you will be prompted several times to evaluate some aspects of
their performance with reference quality music recordings. We find that natural instrument jazz
recordings generally offer the most realistic and accurate sonic reproductions. They are usually of a
small group yet cover a wide frequency range. Most are straight through recordings with a mini-
mum of processing or acoustical manipulation. If you are not really familiar with these types of re-
cordings, your Vandersteen dealer and/or other experts can help you select some. Once you have
established your reference recordings, you can maintain consistency by using these recordings to
evaluate all component, wire and placement changes. Without reference recordings, it is easy to fall
into the trap of trying to retune the system for every different recording.
impedance, the amplifier must be used in single- ended
mode or with a complex, custom crossover the amplifier’s
manufacturer may be able to provide.
To set the M5-HPs in either a balanced or single ended
system, please follow these procedures.
1. Locate the value closest to the input impedance of
your amplifier in the chart located on the top cover
of the M5-HP. If you amplifier’s input impedance
is between values, use the lower value. Note which
switches to turn on to match the input impedance
value.
2. Remove the cover from an M5-HP and locate the
internal set of ten dip switches.
3. Turn on the switches listed for the value you found.
The numbered side is “ON”. A switch is on when it
is depressed on the side of the numbers.
4. Repeat the procedure for the second M5-HP.
Reinstall the covers.
If you are unable to find the amplifier’s input imped-
ance or if you are not completely sure you have the cor-
rect input impedance, you should have a competent tech-
nician at your dealer determine the proper setting for the
M5-HPs by the following method.
1. Connect a signal generator to the input of an M5-HP
crossover, the output of the M5-HP to the input of
I
NSERTING
T
HE
M5-HP I
NTO
T
HE
S
YSTEM
1. Connect the outputs from the properly configured
M5-HPs to the inputs of the main amplifier.
2. With a high-quality cable, connect the left channel
preamplifier output to the input of the M5-HP that is
connected to the left channel of the main amplifier.
your main amplifier and the output of the amplifier to an
oscilloscope as shown in the diagram below.
Signal
Generator
2. Set the M5-HP’s internal dip switches for 50k imped-
ance value as noted on the chart. If the -3db down
point is above 100Hz, try a lower setting. If the -3db
down point is below 100Hz, try a higher setting. When
the -3db down point is at 100Hz, the M5-HP is set to
match your amplifier. (If the oscilloscope is not cali-
brated in db, find the setting where the voltage at
100Hz is .707 of the voltage at 1kHz.) This setting is
the input impedance of your amplifier. It is a good idea
to write it down for future reference.
3. Set the second M5-HP to the same setting.
The M5-HP contains a battery that continuously biases
some of its components. The battery is mounted on the
PC board and has a life expectancy of 7+ years. Please do
not attempt to measure the output of the battery as the
measurement process will drain the battery more than sev-
eral months of normal use. Written on each battery is the
year that it should be replaced to insure continuous opti-
mum performance
.
M5-HP
AMPLIFIER
OSCILLOSCOPE
4. In multi-channel systems, insert the M5-HP between
the processor L&R outputs and the amplifier inputs.
3. With a high-quality cable, connect the right channel
preamplifier output to the input of the M5-HP that is
connected to the right channel of the main amplifier.
H
IGH
-P
ASS
P
REAMPLIFIERS
, A
MPLIFIERS
A
ND
M
ULTI
-C
HANNEL
P
ROCESSORS
