p-5
Setup Instructions
Monitoring Distance = 1 to 2 meters
After carefully unpacking the PM841 /
PM641 Professional Studio Monitor, it is
now time to set up the monitors for the best
acoustic performance in your studio.
The PM841 / PM641 was designed to be
used at a monitoring distance of 1 to 2
meters, typically referred to as the near-
field.
Monitoring Height = the acoustic center
aimed at seated ear height
It is recommended that the PM841 / PM641
be located in such a way that the acoustic
center is located at, or about, seated ear
height (see Figure 1). If this is not possible,
it may be necessary to tilt/aim the monitor
at the listeners ears.
Monitoring Angle = 60 Degrees
The monitoring angle between the left and
right monitors and the listening position
should equal 60 degrees. The easiest way
to determine this is to place the speakers in
such a way that the distance between the
left and right monitor is equal to the moni-
toring distance / listening position (see
Figure 2). It is also recommended that both
speakers be "toed-in" towards the listening
position.
Additional Information
The PM841 / PM641 was designed to be
mounted vertically. This provides for the
most accurate frequency response,
reduces acoustic boundary interference
and provides optimum cooling performance
for the heat sink that is located
on the back
of the studio monitor.
Figure 1
Figure 2
Center of the tweeter/mid range
Center of the woofer
Mid-point of the woofer and tweeter/mid range
Reference listening position
B: loudspeaker base width
D: monitoring distance
Left
Right
B
30˚
D = B
= B
Unpacking
Introduction
Thank you for purchasing the Fostex PM841
/ PM641 Professional Studio Monitor. As with
all Fostex products, the PM841 / PM641 has
been designed to provide superlative perfor-
mance, unquestioned reliability and excep-
tionally high value.
Dedicated 60W (50W: PM641) power
amplifier for 8” (6 1/2”: PM641) woofer,
18W for 4” midrange and 18W for 3/4”
tweeter are individually built-in for high
efficiency and low distortion playback.
The built-in channel divider provides ideally
overlapped frequency crossovers for
smooth connections between the drivers.
Prior to unpacking your Fostex PM841 / PM641 Studio Monitor, carefully inspect the packing mate-
rial for excessive damage. Once it has been determined that the packing material has not been com-
promised, carefully unpack the PM841 / PM641 Studio Monitor and inspect it carefully for obvious
damage. Fostex takes great care in designing packing materials that will survive most expected
impacts during shipping. If any damage is discovered during the inspection process, contact your
Fostex dealer so that this issue can immediately be addressed.
The midrange and tweeter drivers are positioned symmetrically on the Left and Right to minimize
the physical height of the enclosure boxes as well as to minimize the affect of diffraction.
The woofer and the midrange drivers are housed in an individual chamber respectively. The
woofer driver delivers rich and speedy lows in the two-ported bass-reflex chamber. The midrange
driver delivers quality middles in the closed chamber. As the tweeter driver is also sealed struc-
ture itself, there is little interference among the drivers for ideal driving environment.
3-step level adjustments are provided for HIGH FREQ at +1/0/-1 dB and LOW FREQ at +3/0/-3
dB.
The diaphragm for the woofer and midrange is highly rigid with moderate internal loss being made
of highly elastic Kevlar papered by Fostex’s original engineering to perfectly reproduce pulsing
music to sensitive one.
The tweeter diaphragm is UFLC (Urethane Film Laminated Cloth) soft dome type to reproduce
various types of highs keeping its own transparency.
The PM841 / PM641 conforms to ErP directive and pursues energy efficiency. Thus, when
no-signal condition continues for about 25 minutes, it will automatically go into the stand-by mode
and its power withdrawal will become less than 0.5W. During this mode, the power LED color will
change from Blue to Red.
Please take the time to thoroughly read this manual so that you may take full advantage of all the
benefits of the Fostex PM841 / PM641 Professional Studio Monitor.
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PM 841 LEFT CABINET
PM 841 RIGHT CABINET
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