Precision Power PPI4240 User Manual

Thank you for choosing PPI audio epuipment. Now, HANG ON! PPI
products are engineered and manufactured to deliver a wild ride of
performance, sound quality, and reliability. This PPI product reflects our
commitment to offer you versatility and quality for years of incredible power
and listening enjoyment!
SERVICE
Do not attempt to service PPI products yourself. Performing exploratory
surgery on your audio equipment yourself will void the warranty. All parts of
your PPI gear have been built to our specifications. These parts are not
made available to any unauthorized PPI dealer nor are they for sale. Our
goal is to make sure that your PPI product will always perform as good as
the day it was purchased. Contact your authorized PPI dealer about obtain-
ing any warranty service through PPI . (See Warranty inside back cover.)
CAUTION!
The extended use of a high powered audio system may result in hearing loss
or damage. While PPI systems are capable of "Concert Level" volumes,
they are also designed for you to enjoy at more reasonable levels all of the
creative expressions made by musicians. Please stay seated while driving
and observe all local sound ordinances.

Precision Power PPI4240 Specifications

General

Channels	4
RMS Power at 4 Ohms	60W x 4
RMS Power at 2 Ohms	120W x 4
Bridged RMS Power at 4 Ohms	240W x 2
Frequency Response	20Hz - 20kHz
THD at Rated Power	<0.05%
Input Sensitivity	200mV - 6V
Crossover Frequency	50Hz - 500Hz
Crossover Slope	12dB/octave
Bass Boost	0 - 18dB

Summary

Service and Safety Information

Do Not Attempt Self-Service

Performing exploratory surgery on your audio equipment yourself will void the warranty.

Caution: Hearing Loss Risk

Extended use of a high powered audio system may result in hearing loss or damage.

Product Features and Specifications

Key Product Features

Details key technical capabilities like variable crossover and bass boost.

Amplifier Technical Specifications

Lists parameters like power bandwidth, S/N ratio, distortion, and impedance.

Amplifier Model Dimensions

Provides length, width, and height for specific PPI models.

Power Output and Crossover Settings

PPI Model Power Output

Shows RMS wattage for various channel configurations and impedances.

Crossover Frequency and Type

Specifies crossover types (FULL/HPF/LPF) and frequency ranges for channels.

Recommended Fuse Ratings

Lists the maximum fuse rating in Amps for each PPI amplifier model.

Wiring Guide

Formula for Determining Current Draw

Provides a formula to calculate total input wattage and current draw.

Wire Gauge Recommendations

Table shows recommended wire gauge based on current draw and wire length.

Wiring Installation Steps

Proper Routing of Power and Signal Cables

Advises on routing cables to avoid noise and damage, and using grommets.

Battery Connection Safety

Emphasizes disconnecting the negative battery terminal before work.

Remote Turn-on and Grounding

Connecting the Remote Turn-on Lead

How to connect the signal to turn the amplifier on.

Proper Grounding Techniques

Details selecting a metal area, drilling, and attaching ground wires securely.

Endplate Diagram Overview

PPI4240 and PPI5440 Endplate Connections

Identifies numbered terminals for power, ground, speakers, and LEDs.

Bridging and Mono Wiring Configurations

Achieving 4-Ohm Mono Output via Bridging

Explains how to bridge channels for mono operation.

Mixed Mono Operation Configuration

Describes using filters for mixed stereo and mono modes simultaneously.

PPI4240 Endplate Connections

Front RCA and Speaker Inputs

Details where to connect front input signals and speaker cables.

Crossover and Gain Controls

Explains controls for crossover frequency, QBASS, and gain settings.

PPI4240 Endplate Controls

Rear Input and Output Settings

Describes rear channel input, crossover, and output configuration switches.

PPI5440 Endplate Connections

Front, Rear, and Subwoofer Inputs

Identifies RCA and speaker input locations for all channels.

Control Functions for PPI5440

Details gain, crossover, and QBASS controls for the 5-channel model.

PPI5440 Endplate Controls Continued

Input and Output Crossover Switches

Explains selecting FULL/HPF/LPF for various input and output signals.

System Adjustments

Setting Amplifier Input Gain Levels

Steps to adjust gain to avoid distortion and minimize noise.

Crossover Settings Explanation

How to select frequency and type (FULL/HPF/LPF) for speaker output.

QBASS™ Bass Boost

How the Bass Boost Circuit Works

Explains the QBASS control for adding boost centered at 40Hz.

Noise Reduction via Balanced Inputs

Describes how balanced inputs eliminate noise without special cables.

Troubleshooting Common Issues

No Sound Troubleshooting Guide

Steps to diagnose issues when no sound is produced, checking LEDs and connections.

Amplifier Shut-off Causes

Explains Short Circuit and Thermal Protection modes.

System Diagram - System One and Two

System One Configuration

Diagram showing a single PPI amplifier with subwoofer and speakers.

System Two Configuration

Diagram illustrating a system with an EQ, crossover, and amplifier.

System Diagram - System Three

System Three Configuration

Diagram showing a multi-amplifier setup with coaxial and midbass speakers.

System Diagram - System Four

System Four Configuration

Diagram for a 5-channel amplifier system with various speaker types.

Block Diagram PPI4240

Signal Flow for Front Channels

Shows signal path, filters, QBASS, and gain for front RCA input.

Signal Flow for Rear Channels

Illustrates signal path, filters, QBASS, and gain for rear RCA input.

Block Diagram PPI5440

Signal Path for Front and Rear Channels

Details signal processing, filters, QBASS, and gain for front and rear.

Signal Path for Subwoofer Channel

Shows signal flow, filters, QBASS, and gain for the subwoofer input.

Frequency Charts

Front and Rear Channel Crossover Frequencies

Table mapping detent positions to specific crossover frequencies for front/rear.

Subwoofer Channel Crossover Frequencies

Table mapping detent positions to specific crossover frequencies for subwoofers.

3-Year Limited USA Warranty

Warranty Terms for Authorized Installations

Details warranty for units installed by authorized dealers (3-year parts/labor).

Warranty Terms for Non-Authorized Installations

Outlines warranty for units installed by non-authorized dealers (1-year parts).