DESCRIPTION
The ALTEC 15948 Power Amplifier delivers up to
100
watts of output power for all Types of sound reinforcement
Systems. It remains stable with operating conditions of
varylng line voltages and with all types of loads, including
long, unloaded speaker lines having considerable capacitance.
Frequency response and output power characteristics are
shown in Figures 1 through
4.
A switchable, two
-
section highpass filter is provided to pro
-
tect driver loudspeakers from excessive low
-
frequency power
demands.
ALTEC's Active Dissipation Sensing Circuit provides fail
-
safe protection for the output transistors. Circuit action is
immediate and effective at all frequencies within the pass
-
band of the amplifier, limiting only that portion of proyam
material that would damage or degrade the output
transistors.
ACCESSORIES
A
plug.in 15095A or 15335A Line Transformer is available
to provide line isolation. Input sensitivity for full
-
rated
amplifier output
ir 0.2V rms with the 15095A Transforiner
and
0.8V rms with the 15335A Transformer.
The 42526 Shelf Mount Cover
is
available to enclose the
15948 for shelf use. It tilts the 15948 for easy accesr to
front panel controls. The sides and top extend beyond the
front panel
to preventaccidental changes
of
control settihgs.
The cover provides easier handling for portability and it is
sturdy enough to support lightweight equipment placed on
top of it. Four polyethylene feet prevent marring of sur
-
faces. The ALTEC green finish matches the front panel of
the
15948.
INSTALLATION
The 15948 may be installed in a standard 19
-
inch equip
-
ment rack, or in the 42526 Shelf Mount Cover accessory
for shelf
use.
Vertical space requkred
1s
7
inches (four rack
units).
RACK INSTALLATION
Step
1.
Remove four screws securing front panel. Open
and lower panel
as
shown in Figure 5.
Step
2. Install 15948 in equipment rack with appro
-
priate four screws supplied.
Step 3.
Close front panel and secure with four screws
Rreviously removed.
SHELF INSTALLATION
The
15948 may be shelf mounted as desired after installing
the ALTEC 42526 Shelf Mount Cover (refer to 42526
Installation Instructions).
VENTILATION
The 15948 generates minimal heat during normal use. Al
-
though the amount of heat
is
relatively low, the amplifier
POWER DRIVER PCB
POWER DRIVER BALANCE CONTROL
PRIMARY POWER TERMINAL BOARD
"QN
BA
LANCE
CONTROLS
PCB
S\'il'/tl~
CONNtLlO11
(J21
Figure 5. Front View With Hinged Panel Open
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