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P.I.P.–ATNB
1 Welcome
Thank you for purchasing the Crown
P.I.P.–ATNB accessory. P.I.P.
grammable Input Processor) mod-
ules are designed to quickly install in
the rear panel of Crown Com-Tech
Macro-Tech
®
or Studio Reference se-
ries amplifiers. Their versatile fea-
tures expand the capabilities of your
amplifier and enable you to custom-
ize it for your particular needs.
You should find these items when you
unpack:
P.I.P.–ATNB Module
Two 8-32 Phillips Machine Screws
Two Lock Washers
Two Quick-Disconnect Barrier
Blocks
This Reference Manual
Features
Balanced inputs with 1:1 isolation
transformers to minimize input noise.
RFI filter for attenuation of unwanted
ultrasonic frequencies. The RFI filter
is a 12 dB/octave, Bessel-tuned low-
pass filter with a 3 dB roll-off point at
33 kHz.
Switchable subsonic/bass filter with
the following settings: flat, 50, 100, or
300 Hz roll-off.
Switchable constant-directivity horn
equalization network.
Calibrated 21 position attenuators
give accurate level control of the in-
put signal.
Removable barrier block connectors
provide greater wiring flexibility and
easy installation.
Facilities
A. Balanced Input
These removable barrier-block con-
®
(Pro-
nectors (Figure 1.1) make it quick
and easy to attach an input cable
with just three screws. Once the
®
,
cable is attached, the connector can
be quickly unplugged and, if desired,
moved to a different amplifier.
B. Input Attenuators
Each channel has a calibrated at-
tenuator (Figure 1.1) for accurate
level adjustment. They have 21
detented positions which "click" into
place for ease of use.
C. Subsonic/Bass Switch
A 4-position slide switch for each
channel (Figure 1.2) controls the sub-
sonic/bass filter. This filter is an 18
dB/octave Butterworth high-pass fil-
ter which can be selected to attenu-
ate frequencies below 50 Hz, 100 Hz
or 300 Hz. It can also be switched off
(FLAT). The switch positions are la-
belled on the circuit board between
the two switches.
D. Horn Equalization Jumper
A jumper is provided for each chan-
nel (Figure 1.2) to enable/disable the
constant-directivity horn equalization.
The jumper for channel 1 (EQ1) is
shown in the ON position while the
channel 2 jumper (EQ2) is shown in
the OFF position. This equalization
circuit is a 6 dB/octave shelving net-
work with a 3 dB rise at 3.2 kHz and
a peak boost of 12.5 dB at 24 kHz.
Page 3
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