P.I.P.-ATN - Uncategorized CROWN - Free user manual and instructions

Product Type	Programmable Input Processor (P.I.P.) module for Crown Com-Tech® and Macro-Tech® series amplifiers
Brand	Crown (also exported as Amcron®)
Model	P.I.P.-ATN
Dimensions	16.2 x 4.8 x 9.8 cm (638 x 178 x 378 in)
Weight	12 ounces (340 grams)
Input Impedance	20 kohm nominal
Maximum Input Level	+20 dB at 1 kHz
Nominal Gain	Unity
Frequency Response	±1 dB from 20 Hz to 20 kHz (filters off)
Signal-to-Noise Ratio	Better than -85 dB (equivalent input noise) from 20 Hz to 20 kHz
Common Mode Rejection	Better than 60 dB at 1 kHz
Crosstalk	-82 dB at 1 kHz
Input Attenuator	32-step calibrated attenuator per channel: 1 dB steps (0-16 dB), 2 dB steps (18-24 dB), 3 dB steps (27-36 dB), 4 dB steps (40-60 dB), and infinite
Subsonic/Bass Filter	18 dB/octave Butterworth high-pass filter, selectable roll-off at 50 Hz, 100 Hz, 300 Hz, or Flat
Constant-Directivity Horn EQ	6 dB/octave shelving network, 3 dB rise at 3.2 kHz, 12.5 dB peak at 24 kHz; switchable on/off per channel
RFI Filter	Permanent 12 dB/octave Bessel low-pass filter, -3 dB at 33 kHz
Input Connectors	Quick-disconnect barrier blocks (balanced inputs with 1:1 isolation transformers)
Recommended Source Impedance	10 kohm or less
Installation	Quick install in rear panel of Crown Com-Tech® or Macro-Tech® amplifiers; requires Phillips screwdriver
Safety Note	Turn off amplifier and disconnect AC power before installation; avoid circuit tampering
Warranty	Voided by unauthorized modifications

Frequently Asked Questions - P.I.P.-ATN CROWN

What is the Crown P.I.P.-ATN?

The P.I.P.-ATN is a Programmable Input Processor module that installs in Crown Com-Tech® or Macro-Tech® amplifiers to add balanced inputs, filtering, and level control.

Which amplifiers are compatible with the P.I.P.-ATN?

It is designed for Crown Com-Tech® and Macro-Tech® series amplifiers that have a P.I.P. slot.

How do I install the P.I.P.-ATN?

First, turn off the amplifier and disconnect AC power. Remove any existing module, align the edge connector with the card rails, push firmly, and secure with two screws and lock washers. Then reconnect power and set attenuators.

What is the purpose of the subsonic/bass filter?

It is an 18 dB/octave high-pass filter that can be set to 50 Hz, 100 Hz, 300 Hz, or off (Flat) to reduce low-frequency noise or rumble.

How do I adjust the constant-directivity horn equalization?

Use the on-board jumper (J1 for channel 1, J2 for channel 2) to enable or disable the EQ. When on, it provides a 6 dB/octave shelving boost with a 3 dB rise at 3.2 kHz and a peak of 12.5 dB at 24 kHz.

Can I bypass the RFI filter?

No, the RFI filter is permanent and always active. It is a 12 dB/octave low-pass filter with a -3 dB point at 33 kHz.

What is the maximum input level?

The maximum input level is +20 dB at 1 kHz.

How should I clean the P.I.P.-ATN?

The manual does not specify cleaning instructions. Typically, use a dry or slightly damp cloth. Avoid solvents and do not tamper with circuitry.

What is the warranty coverage?

Crown does not cover damage from overdriven components or unauthorized circuit modifications. Tampering voids the warranty.

How many steps does the input attenuator have?

It has 32 detented steps: 1 dB increments from 0 to 16 dB, then 2 dB, 3 dB, 4 dB steps, and infinite attenuation at the final step.

USER MANUAL P.I.P.-ATN CROWN

Simple line drawing of a crown inside a rounded square frame (no text or symbols)

P.I.P.-ATN

PROGRAMMABLE INPUT PROCESSOR

OWNER'S MANUAL

Exported to select countries as Amcron®

©1994 by CROWN INTERNATIONAL, INC.

P.O. Box 1000, Elkhart, IN 46515

Telephone: [phone]

Amcron ^® , Crown ^® , Com-Tech ^® , Macro-Tech ^® and P.I.P. ^® are registered trademarks of Crown International, Inc.

Fig. 1.1 Front View

Thank you for purchasing the Crown P.I.P.-ATN accessory. P.I.P. ^® modules are designed to quickly install in the rear panel of Crown Com-Tech ^® or Macro-Tech ^® series amplifiers. P.I.P. stands for “Programmable Input Processor.” Their versatile features expand the capabilities of your amplifier and enable you to customize it for your particular needs.

You should find these items when you unpack:

P.I.P.-ATN Module

Two 8-32 Phillips Machine Screws

Two Lock Washers

Two Quick-Disconnect Barrier Blocks

This Owner's Manual

Features

☐ Balanced inputs with 1:1 isolation transformers to help keep the input noise-free.
☐ RFI filter which attenuates unwanted ultrasonic frequencies. 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.
☐ Constant-directivity horn equalization network which can be switched on or off.
☐ Calibrated 32-step attenuators give precise level control of the input signal.
☐ Quick-connect barrier block connectors provide greater wiring flexibility and make installation easier.

Facilities

A. Balanced Input

With these special quick-connect barrier-block connectors (Figure 1.1), it's quick and easy to attach each 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 Attenuator

A calibrated precision attenuator (Figure 1.1) provides accurate level adjustment. It has 32 detented steps which "click" into place for ease of use. Positions 1–17 advance in 1 dB increments. Positions 18–21 advance in 2 dB increments. Positions 22–25 advance in 3 dB increments. Positions 26–31 advance in 4 dB increments. The last step is infinite attenuation.

C. Subsonic/Bass Switch

A 4-position sliding switch for each channel(Fig. 1.2) controls 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 switch settings.

D. Constant-Directivity Horn Equalization Jumper

A jumper is provided for each channel (Figure 1.2) to enable/disable the constant-directivity horn equalization. The jumper for channel 1 (J1) is shown in the "OFF" position while the jumper for channel 2 (J2) is shown in the "ON" position. The constant directivity horn equalization is a 6 dB/octave shelving network with a 3 dB rise at 3.2 kHz and a peak boost of 12.5 dB at 24 kHz.

2 Installation

Before installing this P.I.P. module, you'll want to configure it.

Note: The RFI filter is always on and cannot be switched off.

1. Adjust the constant-directivity equalization jumper of each channel to be either "on" or "off" (see Figure 1.2). Figure 2.1 shows the frequency response through the P.I.P.-ATN when this filter is on.
2. Select the desired position for the Subsonic/Bass filter switch for each channel. Pushing the switch all the way forward toward the front of the module switches the filter off ("Flat"). A label is affixed to the inside of the switch to show what the positions do (see also Figure 1.2). Figure 2.2 shows the frequency response through the P.I.P.-ATN when this filter is set in each of its four modes (Flat, 50 Hz, 100 Hz, 300 Hz).

Now you are ready to install the P.I.P. in the amplifier.

IMPORTANT: Before connecting this or any P.I.P. to your amplifier, it is important to turn its level controls down, turn it off and remove the AC power from it. Even though the amplifier is off, there could still be enough energy in the circuitry to cause electric shock.

You need only a phillips screwdriver to connect your P.I.P.-ATN.

1. If present, remove the cover over the level controls. 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) and pull straight out with firm pressure.
3. Align the edge connector of the P.I.P. circuit board into the P.I.P. card rails (Figure 2.3).
4. Firmly push the P.I.P.-ATN all the way in until it is seated against the mounting bracket.
5. Secure it with the two screws and lock washers provided. The lock washers are important because they bond the P.I.P. to the chassis ground of the amp.
6. Turn the input attenuators to zero attenuation (full clockwise).
7. Plug in the amplifier and turn it on. Adjust the level controls of the amplifier to the maximum desired setting. If a cover panel was installed over the level controls, reinstall it.
8. Make minor level adjustments using the precision attenuator controls on the P.I.P.-ATN.

If you do not want to use the attenuator controls on the P.I.P., you can skip steps 6–8 and turn them to zero. In this case use only the level controls of the amplifier to adjust the signal level.

Do not tamper with the circuitry. Circuit changes made by unauthorized personnel, or unauthorized circuit modifications, void the warranty.

Remember: Crown is not liable for damage resulting from overdriven components in your sound system.

Fig. 2.1 Constant-Directivity Horn Equalization (with RFI filter)

Fig. 2.2 Subsonic/Bass Filter Settings

Fig. 2.3 P.I.P. Installation

crown

P.I.P.-ATN

P.I.P.-ATN

crown

Only one channel shown

Schematic

J0362-4 rev. B

Notes:

1. All resistors are in ohms, 0.25W, 1%, unless specified otherwise.
2. All capacitors are in microfarads unless specified otherwise.

Schematic

3 Specifications

Signal to Noise: Better than -85 dB (equivalent input noise) from 20 Hz to 20 kHz.

Common Mode Rejection: Better than 60 dB at 1 kHz.

Crosstalk: -82 dB at 1 kHz.

Input Impedance: Nominally 20 kohm.

Recommended Source Impedance: 10 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 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-directivity horn equalization network has 3 dB rise at 3.2 kHz with 12.5 dB peak at 24 kHz (see Figure 3.1). 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 response.

Attenuation: 32-step attenuator for each channel:

Attenuation	Step Size
0 – 16 dB	1 dB
18 – 24 dB	2 dB
27 – 36 dB	3 dB
40 – 60 dB	4 dB
∞	Infinite

Dimensions: 638 × 178 × 378 in (16.2 x 4.8 x 9.8 cm).

Weight: 12 ounces (340 grams).

Note: All specifications referenced to a 0.775 V input signal.

crown®

THE PROFESSIONAL AUDIO DIVISION OF CROWN INTERNATIONAL, INC.

57620 C.R. 105, Elkhart, Indiana 46517 USA

TEL: [phone] (USA) or 219-294-8200 FAX: [phone]