Crown PIP-ATNB User manual

100667-1
9/96
© 1996 by Crown International, Inc., P.O. Box 1000, Elkhart, IN 46515-1000
U.S.A. Telephone: [phone]. Fax: [phone]. Crown P.I.P. modules
are produced by the Professional Audio Division of Crown International, Inc.
Trademark Notice: Crown
®,
Com-Tech
®,
Macro-Tech
®and
P.I.P.
®are
registered trademarks of Crown International, Inc. Other trademarks are the
property of their respective owners.
0
dB .512
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3050∞
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dB .512
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Programmable
Input Processor (P.I.P.)
+– –
ATTENUATION ATTENUATION
ATN
B
CH-2 INPUT CH-1 INPUT
+

Page 2
P.I.P.–ATNB
0
dB .512
3
4
5
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11
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18
21
24
3050∞
0
dB .512
3
4
5
6
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8
9
11
12
14
16
18
21
24
3050∞
Programmable
Input Processor (P.I.P.)
+– –
ATTENUATION ATTENUATION
ATN
B
CH-2 INPUT CH-1 INPUT
+
BABA
Fig. 1.2 Bottom View
Fig. 1.1 Front View
D
S2 S1
FLAT
50 Hz
100 Hz
300 Hz
ON
OFF
EQ2
OFF / ON
EQ1
OFF / ON
DC

Page 3
P.I.P.–ATNB
Facilities
A. Balanced Input
These removable barrier-block con-
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
bequicklyunpluggedand,ifdesired,
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(Figure1.2)controlsthesub-
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-directivityhornequalization.
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.
1 Welcome
Thank you for purchasing the Crown
P.I.P.–ATNB accessory. P.I.P.
® (Pro-
grammable Input Processor) mod-
ules are designed to quickly install in
the rear panel of Crown Com-Tech
®,
Macro-Tech
®or
StudioReference se-
ries amplifiers. Their versatile fea-
tures expand the capabilities of your
amplifier and enable you to custom-
ize it for your particular needs.
Youshouldfindtheseitemswhenyou
unpack:
P.I.P.–ATNBModule
Two8-32PhillipsMachineScrews
TwoLock Washers
TwoQuick-Disconnect Barrier
Blocks
ThisReferenceManual
Features
❏Balanced inputs with 1:1 isolation
transformers tominimize inputnoise.
❏RFI filter for attenuation of unwanted
ultrasonic frequencies. The RFI filter
isa 12dB/octave,Bessel-tuned low-
pass filter with a 3 dB roll-off point at
33kHz.
❏Switchable subsonic/bass filter with
thefollowing settings:flat, 50,100, or
300Hz roll-off.
❏Switchable constant-directivity horn
equalizationnetwork.
❏Calibrated 21 position attenuators
give accurate level control of the in-
putsignal.
❏Removablebarrier blockconnectors
provide greater wiring flexibility and
easyinstallation.

Page 4
P.I.P.–ATNB
Fig. 2.3 Installation into a
Standard P.I.P. Amplifier
Fig. 2.1 Constant-Directivity Horn
Equalization (with RFI filter)
Fig. 2.2 Subsonic/Bass Filter Settings
2 Installation
Before installing this P.I.P. module, it
will need to be configured. The first
two steps in the installation proce-
dure focus on this. A phillips screw-
driver is required.
CAUTION: Before installing this or
any
P.I.P. in your amplifier, it is impor-
tant to turn down the amplifier’s level
controls,turn offthe amplifier and dis-
connect the AC power. Even though
the amplifier is off, there could still be
enough energy in the circuitry to
cause electric shock.
Please note: The RFI filter is always
on—it cannot be switched off.
1. Adjusttheconstant-directivityequal-
izationjumper of eachchannel to be
ON or OFF (see Figure 1.2). Figure
2.1 shows the frequency response
throughthe P.I.P.–ATNB when this fil-
ter is on.
ter is set in each of its four modes
(Flat, 50 Hz, 100 Hz, 300 Hz).
3. Turn the Attenuator controls of the
P.I.P.–ATNB full counterclockwise to
∞(fullor infinite attenuation).
4. Turndown theamplifier levelcontrols
(fully counterclockwise), turn off the
amplifier, and unplug it from the AC
powersource.
5. Removethe existing P.I.P. module or
panel(two screws).For PIP2 amplifi-
ers, this may involve disconnecting
the P.I.P. from a PIP2 input adapter
(see Figures 2.4 and 2.5). If a PIP2
input adapter is already present, do
not remove the ribbon cables from
the adapter. Otherwise you will have
toreconnect themin the nextstep.
6. Standard P.I.P. Amplifiers: Align the
edges of the P.I.P.–ATNB in the P.I.P.
card rails and firmly push the unit in
until it is seated against the mount-
ing bracket (see Figure 2.3).
P.I.P.
MODULE
BACK PANEL
OF AMPLIFIER
2. Select the desired position for the
Subsonic/Bass filter switch for each
channel. Sliding the switch to the
FLAT position switches off the filter.
Theswitch positionsareidentifiedon
the circuit board between the two
switches(see Figure1.2). Figure2.2
shows the frequency response
throughthe P.I.P.–ATNB when this fil-
100 1 K 10 K 20 K
FREQUENCY (Hz)
dB
+12
+6
0
–6
HORN EQ
NO HORN EQ
10 100 1 K
FREQUENCY
(
Hz
)
dB
0
–6
–12
–18
FLAT
50 Hz 100 Hz 300 Hz

Page 5
P.I.P.–ATNB
P.I.P.
MODULE
BACK PANEL
OF PIP2
AMPLIFIER
PIP2 ADAPTER
A
B
B
A
18 PIN (B)
20 PIN (A)
PIP2 ADAPTER
FROM AMPLIFIER
Fig. 2.4 PIP2 Input Adapter
Connection
Fig. 2.5 Installation into a
PIP2 Amplifier
PIP2 Amplifiers: (Requires the PIP2
ADAPTER.) Connect the PIP2 input
adapterto thetwoinput cablesof the
amplifier(see Figure2.4). Noticethe
PIP2 input adapter should be posi-
tionedwith the P.I.P. edge connector
ontop andfacingaway fromtheam-
plifier. The 20 pin cable (A) is con-
nectedfirst, thenthe 18pin cable(B)
is connected. Both ribbon cables
should extend below the PIP2 input
adapter.
Next, insert the edge connector of
the P.I.P.–ATNB into the PIP2 input
adapter (see Figure 2.5) and insert
the assembly into the P.I.P. opening
in the back of the amplifier.
7. Secure the P.I.P.–ATNB with the two
screws and lock washers provided.
The lock washers are important be-
cause they bond the P.I.P. to ampli-
fier chassis ground to ensure
electrical and mechanical integrity
forsafety and performance.
8. Reconnect the amplifier to the AC
power and turn it on.
9. Connect the audio signal wiring to
the XLR connectors of the P.I.P.–
ATNB accordingtothe instructionsin
youramplifier’s ReferenceManual .
10.Adjust the amplifier level controls to
the maximum desired level. This
should be the maximum setting you
everwant theamplifier touse incase
theAttenuation controlsonthe P.I.P.–
ATNB are ever set to 0 (zero) dB at-
tenuation.
11.Use the Attenuator controls on the
P.I.P.–ATNB .to adjustthe inputaudio
signal level. Note: If you do not want
to use the Attenuator controls on the
P.I.P., turn them to 0 dB (full clock-
wise)and usethe amplifierlevelcon-
trols to adjust the input audio signal
level.
Do NOT change the circuitry. Unau-
thorized circuit modifications, void
the warranty.
Remember: Crown is not liable for
damage resulting from overdriven
components in your sound system.

Page 6
P.I.P.–ATNB
Only one
channel shown
Electronic image for this figure
were not included due to quality
considerations. Please refer to
the printed documentation.

Page 7
P.I.P.–ATNB
J0723-7 Rev. A
Notes:
1. All resistors are in ohms, 0.25W, 1%, unless specified otherwise.
2. All capacitors are in microfarads unless specified otherwise.
Electronic image for this figure
were not included due to quality
considerations. Please refer to
the printed documentation.

Page 8
P.I.P.–ATNB
and horn equalization off. High-pass
(subsonic/bass) filter has selectable
–3 dB roll-off points of 50, 100 or 300
Hz (see Figure 2.2). Constant-direc-
tivity horn equalization network has 3
dB rise at 3.2 kHz with 12.5 dB peak
at24kHz(seeFigure2.1). Both these
filters can be switched off if desired.
A permanent RFI filter with a –3 dB
roll-off at 33 kHz also affects the re-
sponse.
Attenuation: 21 position attenuator
for each channel. The attenuation
settings are: 0, .5, 1, 2, 3, 4, 5, 6, 7, 8,
9, 11, 12, 14, 16, 18, 21, 24, 30, 50
and ∞(infinite) dB.
Dimensions: 6 3/8x 1 7/8x 3 7/8in
(16.2 x 4.8 x 9.8 cm).
Weight: 12 ounces (340 grams).
3 Specifications
Note: All specifications referenced to
a 0.775 V input signal.
Signal to Noise: Better than –85 dB
(equivalentinput noise) from20Hz to
20 kHz.
Common Mode Rejection: Better
than 60 dB at 1 kHz.
Crosstalk: –82 dB at 1 kHz.
Input Impedance: Nominally 10
kohm.
Recommended Source
Impedance: 1 kohm or less.
Maximum Input Level: +20 dB at 1
kHz.
Nominal Gain:Unity.
Frequency Response: ±1 dB from
20 Hz to 20 kHz when filters set flat
ForTechnicalSupportcontact:
Crown Audio Division Technical Support Group
Plant2 SW, 1718 W.Mishawaka Rd., Elkhart, Indiana46517 U.S.A.
Phone: [phone] (North America, Puerto Rico and Virgin Islands) or 219-294-8200
Fax: [phone] Fax Back: 800-294-4094 (North America only) or 219-293-9200
Internet:http://www.crownintl.com