Crown PIP-ISO User manual

P.I.P.-ISO
125354-1
10/97
© 1997 by Crown International, Inc., P.O. Box 1000,
Elkhart,Indiana46515-1000U.S.A.Telephone:219-294-
8000. Crown P.I.P. modules are produced by the
Professional Audio Division of Crown International, Inc.
Trademark Notice: Com-Tech
®,
Crown
®,
Amcron
®,
Macro-Tech
®and
P.I.P.
®are registered trademarks of
Crown International, Inc. Other trademarks are the
property of their respective owners.
®
E106377
Applies only to North
Americanunits.
ISO
Programmable
Input Processor (P.I.P.)
—WARNING—
THIS P.I.P. PROVIDES FULL ISOLATION
FOR ISO-MODIFIED AMPLIFIERS ONLY!
DO NOT CONNECT THE OUTPUT GROUND
LUG TO THE INPUT COMMON OR CHASSIS
GROUND. REFER TO P.I.P.–ISO OWNER’S
MANUAL FOR FURTHER INFORMATION.
+–
CH-2 INPUT
+–
CH-1 INPUT

P.I.P.-ISO
Page 2

P.I.P.-ISO
Page 3
1 Welcome
Thank you for purchasing the
Crown P.I.P.-ISO accessory.
P.I.P.
®modules are designed to
quickly install in the rear panel of
many Crown amplifiers. P.I.P.
stands for “Programmable Input
Processor.” Their versatile fea-
tures expand the capabilities of
your amplifier and enable you to
customize it for your particular
needs.
The P.I.P.-ISO is intended for use
with ISO-MODIFIED Com-Tech
®
series amplifiers. If it is used with
an amplifier that is not iso-modified
it will not have full isolation. In such
a case, only the input (not the out-
put) will be isolated from ground.
The P.I.P.-ISO comes with a “ISO-
MOD KIT” so a Com-Tech ampli-
fier can be iso-modified. (These
kits are also available separately.)
The amplifier modification
should be performed only by a
qualified technician. Once an
amplifier has been iso-modified, it
should not be used with any other
P.I.P. modules except the P.I.P.-
ISO
. (It is also possible to iso-
modify a Macro-Tech
®series am-
plifier but the procedure is differ-
ent. Contact the Crown Technical
Support Group for more informa-
tion, if required, at 219/294-8200
or 800/342-6939.)
An iso-modified amplifier with a
P.I.P.-ISO has completely isolated
outputs—the output voltage avail-
able between the positive and
ground terminal is not referenced
to earth ground. Even if either out-
put terminal is continuously
shorted to the earth ground (chas-
sis), no damage will occur to the
amplifier or any equipment inter-
connected to it.
The amplifier inputs are isolated
by means of input transformers.
The transformers are designed for
1 kVAC breakdown isolation and
have less than 25 pF of primary to
secondary capacitance yielding
excellent common mode rejection.
In addition to isolation, the P.I.P.-
ISO includes a switchable high-
pass filter to attenuate unwanted
Fig. 1.1 P.I.P.-ISO
ISO
Programmable
Input Processor (P.I.P.)
—WARNING—
THIS P.I.P. PROVIDES FULL ISOLATION
FOR ISO-MODIFIED AMPLIFIERS ONLY!
DO NOT CONNECT THE OUTPUT GROUND
LUG TO THE INPUT COMMON OR CHASSIS
GROUND. REFER TO P.I.P.–ISO OWNER’S
MANUAL FOR FURTHER INFORMATION.
+–
CH-2 INPUT
+–
CH-1 INPUT

P.I.P.-ISO
Page 4
subsonicsorlowfrequenciesanda
RFI(RadioFrequencyInterference)
filtertoattenuateultrasonicfrequen-
cies.
You should find the following items
when you unpack:
P.I.P.-ISOmodule
Two8-32PhillipsMachine Screws
TwoLock Washers
TwoQuick-Disconnect BarrierBlocks
ThisOwner’s Manual
OneISO-MOD KIT containing:
OneIsolation Network
One P.I.P. connector KeyingPlug
Onepiece ofself-stick FishPaper
OneISO-MOD Warning Sticker
ISO-MODInstruction Sheet
1.1 Features
❏Fail-safe output isolation allows
either side of outputs to be
shorted to chassis ground with
no worries.
❏EMI (Electro-Magnetic Inter-
ference) shielding provides
additional gain margin under
fault conditions.
❏Balanced inputs with 1 kVAC
breakdown 1:1 isolation
transformers.
❏Excellent common mode
rejection.
❏RFI filter which attenuates
unwanted ultrasonic
frequencies that would
otherwise waste amplifier
power. The RFI filter is a
12 dB/octave (2nd order),
Bessel-tuned low-pass filter
with a 3 dB roll-off point at
33 kHz.
❏Switchable subsonic/bass filter
with 50, 100 or 300 Hz roll-off
frequencies.
❏Quick-connect barrier block
connectors provide greater
wiring flexibility and make
installation easier.
Fig. 2.1 Front View
ISO
Programmable
Input Processor (P.I.P.)
—WARNING—
THIS P.I.P. PROVIDES FULL ISOLATION
FOR ISO-MODIFIED AMPLIFIERS ONLY!
DO NOT CONNECT THE OUTPUT GROUND
LUG TO THE INPUT COMMON OR CHASSIS
GROUND. REFER TO P.I.P.–ISO OWNER’S
MANUAL FOR FURTHER INFORMATION.
+–
CH-2 INPUT
+–
CH-1 INPUT
AA

P.I.P.-ISO
Page 5
2 Facilities
A. Balanced Input
With these special quick-connect
barrier-block connectors, it’s
quick and easy to attach each in-
put cable with just three screws.
Once the cable is attached, the
connector can be quickly un-
plugged and, if desired, moved to
a different amplifier.
B. Subsonic/Bass Switch
A 4-position sliding switch is pro-
vided for each channel to control
the subsonic/bass filter. This filter
is an 18 dB/octave (3rd order)
Butterworth high-pass filter which
can be selected to attenuate low
frequencies below 50 Hz, 100 Hz
or 300 Hz. It can also be switched
off (Flat). A label on the side of
each switch identifies the settings.
Fig. 2.3 Side View
Fig. 2.2 Bottom View
BB
CH 2 CH 1
B
FLAT
50 Hz
100 Hz 300 Hz

P.I.P.-ISO
Page 6
3 Installation
The P.I.P.-ISO provides input iso-
lation with any P.I.P. -compatible
amplifier but it will only provide
output isolation with an amplifier
that has been ISO-MODIFIED.
Only a Crown-authorized service
technician should attempt to
modify an amplifier. Instructions
for iso-modifying Com-Tech ampli-
fiers are included in each ISO-
MOD KIT.
Before installing this P.I.P. module,
you’ll want to adjust its subsonic/
bass filters to best serve your
needs.
Thisiseasilyaccomplishedwiththe
four-position sliding switch located
at either side of the
P.I.P.-ISO (see
Figure 2.2 and 2.3). The switch on
theleftcontrolsthefilterforChannel
2 and the switch on the right con-
trols the filter for Channel 1. Each
switch is clearly labelled (Flat, 50
Hz, 100 Hz, 300 Hz). Figure 3.1
shows the low-frequency response
throughtheP.I.P.-ISO for each filter
position.
Note: The RFI filter is always on.
3.1 Installation Procedures
You may need a phillips screw-
driver to remove the existing P.I.P.
moduleorpanel fromyouramplifier.
CAUTION:CAUTION:
CAUTION:CAUTION:
CAUTION: Before connecting this
or any P.I.P. to your amplifier, it is
important to turn its level controls
down,turn it off and removethe AC
power. Don’t touch the circuitry.
Even though the amplifier is off,
there could still be enough energy
remainingtocauseelectricshock.
1. Turn down the level controls (full
counterclockwise), turn off the
amplifier and unplug it from the
AC power source.
2. Remove the existing P.I.P.
module or panel (two screws).
For PIP2 amplifiers, this may
10 100 1 K
FREQUENCY (Hz)
dB
0
–6
–12
–18
FLAT
50 Hz 100 Hz 300 Hz
Fig. 3.1 Subsonic/Bass Filter Settings

P.I.P.-ISO
Page 7
A
B
B
A
18 PIN (B)
20 PIN (A)
Q43528-1
FROM AMPLIFIER
P.I.P.
MODULE
BACK PANEL
OF PIP2
AMPLIFIER
PIP2 CONNECTOR
BOARD
Fig. 3.3 PIP2 Input Adapter
Connection
Fig. 3.4 Installation into a
PIP2 Amplifier
P.I.P.
MODULE
BACK PANEL
OF AMPLIFIER
Fig. 3.2 Installation into a
Standard P.I.P. Amplifier
involve disconnecting the P.I.P.
from a PIP2 input adapter (see
Figures 3.3 and 3.4). If a PIP2
inputadapterisalreadypresent,
donotremovetheribboncables
fromtheadapter.Otherwiseyou
willhavetoreconnecttheminthe
nextstep.
3.
Standard P.I.P. Amplifiers : Align
theedgesofthe P.I.P.–ISO inthe
P.I.P. card rails and firmly push
theunitinuntilitisseatedagainst
the mounting bracket (see
Figure 3.2).
PIP2 Amplifiers: (Requires a
PIP2 input adaptor. Crown part
number Q43528-1.) Connect
the
PIP2 inputadaptertothetwo
inputcablesoftheamplifier(see
Figure 3.3). Notice that the
PIP2
input adapter should be
positioned with the P.I.P. edge
connector on top and facing
away from the amplifier. The 20
pin cable (A) is connected first
then the 18 pin cable (B) is
connected. Both ribbon cables
should extend below the
PIP2
input adapter.
Next, insert the edge connector
of the
P.I.P.–ISO into the PIP2
input adapter (see Figure 3.4)
and insert the assembly into the
P.I.P. opening in the back of the
amplifier.
4. Secure the
P.I.P.–ISO with the
two screws and lock washers
provided.(Thelockwashersare
important because they bond
the
P.I.P. to the chassis ground
of the amplifier.)
5. Connectinputandoutputwiring.
6. Plug in the amplifier and turn it
on. Adjust its level controls to a
desired setting.
Do not tamper with the circuitry.
Circuit changes made by unautho-
rized personnel, or unauthorized
circuit modifications are not al-
lowed.

P.I.P.-ISO
Page 8
Remember: Crown is not liable for
any damage resulting from over-
driving other components in your
sound system.
Figure 3.5 shows how to wire a bal-
anced and unbalanced source or
daisy-chain output to the barrier
blockconnectors.
Important:Ifthe amplifier is used in
either Bridged-Mono or Parallel-
Monomode,you mustturnthe Ch.2
amplifierlevelcontroloff(fullycoun-
terclockwise). The input and level
control of Ch. 2 are not defeated in
monomodesoanysignalapplied to
Ch. 2 will beat against the signal in
Ch.1.
Refer to the amplifier Reference
Manual for more information about
Bridged-Mono or Parallel-Mono
modesofoperation.
Fig. 3.5 Audio Wiring
– + – +
BALANCED
SOURCE UNBALANCED SOURCE

P.I.P.-ISO
Page 9
filtersetto flat. Less than 0.5% THD
for +18 dBm input above 100 Hz
with bass filter set to flat.
Input Impedance: Nominally 10 K
ohm.
Maximum Source Impedance for
Proper Isolation: 600 ohms.
Maximum Input Level: +20 dB at
1 kHz.
Nominal Gain: Unity.
Frequency Response: ±1 dB
from 20 Hz to 15 kHz when sub-
sonic/bass filters set flat. The sub-
sonic/bass (high-pass) filters have
selectable –3 dB roll-off points of
50, 100 or 300 Hz (see Figure 3.6)
and can be switched off if desired.
A permanent RFI filter with a –3 dB
roll-off at 33 kHz also affects the
response.
Dimensions: 6 3/8 x 1 7/8 x 3 7/8 in
(16.2 x 4.8 x 9.8 cm).
Weight: 14 ounces (397 grams).
®
E106377
4 Specifications
Note: All specifications referenced
to a 0.775 V input signal.
Signal to Noise: Better than –90
dB (equivalent input noise) 20 Hz
to 20 kHz.
Common Mode Rejection: 85 dB
at 1 kHz; 78 dB at 10 kHz; 68 dB at
15 kHz.
Crosstalk: –85 dB at 1 kHz; –82
dB at 10 kHz; –80 dB at 15 kHz.
Harmonic Distortion: Less than
0.01% THD for 0 dBm input at 1
kHz with bass filter set to any posi-
tion. Less than 0.5% THD for +10
dBm input above 50 Hz with bass
Applies only to
North American
units.