Studio Technologies AN-2 - Manual (Page 4)

Issue 3 AN-2 User Guide
Page 6 Studio Technologies, Inc.
Mono Compatibility
In many applications, especially recording
and broadcast, it is critical that any stereo
signal produced can be summed (L+R)
without adverse effects. The AN-2 was
designed so that the simulated stereo signal
produced is completely mono compatible.
No setting of the controls or circuit anoma-
lies ever produce a problem in this area.
The AN-2 uses the classical technique of
creating comb filters, as shown in Figure 1.
The transfer function of the upper network
is H(z) = 1 – z
–n , resulting in dips at 1/T,
2/T, 3/T, etc. The lower network is merely
the complement of the upper; where the
upper network has an amplitude peak, the
lower has an amplitude dip. If the two out-
puts are summed, it can easily be seen that
the delay line is cancelled out, leaving only
the direct, or mono, unaltered signal.
Installation
The AN-2 is rack-mountable, requiring one
1.75-inch (4.45cm) rack space. It weighs
five pounds (2.27kg), and operates on
either 115Vac or 230Vac. Refer to the
Specifications section for more complete
electrical and physical specifications.
Placement
If you wish to mount your AN-2 near other
equipment, make certain that it is not near
the power transformer of another unit. The
AN-2 is well shielded, but some of the
circuitry is sensitive to high levels of EMF
from outside sources.
Connecting the Unit to Power
The AN-2 may be operated from either
100-125 or 200-250Vac power, 50/60Hz.
Units shipped to North America are factory
selected for 115V operation and are sup-
plied with a 0.5A 3AG fuse. Units shipped
outside North America are factory selected
for 230V operation and supplied with a
0.25A 5 x 20mm fuse. Before connecting
the AN-2 to power, determine the actual line
voltage and check to see that the voltage
selector switch (located on the back panel
of the unit) is set to the appropriate voltage.
Please note that an incorrect setting could
seriously damage the unit. Should it be
necessary to change the voltage selection,
insure that the correct fuse value is used:
0.5A for 115V, 0.25A for 230V.
The AN-2 utilizes an IEC standard connec-
tor to mate with the line cord. The line
cord supplied has a North American stan-
dard plug at one end and an IEC connector
at the other. In non-North American app-
lications the plug must be cut off and an
Figure 1
For musical reasons, the AN-2 uses a
network after the delay line to randomize
the peaks and dips. However, the peaks
and dips are still interleaved and the mono
sum is also the same as the input signal.