IM Series Modules for MPA Series Amplifiers


Crossover modules in the IM Series include the IM10 MPA Crossover and the IM11 MPA Sub-Bass Crossover and the IM12 Cinema Crossover.


IM10 MPA Crossover Module
IM10 Specification Sheet (Adobe Acrobat, 72kb)

Key Features:

When a basic crossover function is desired, this module offers a very compact and cost-effective solution. Ten crossover frequencies, four transducer delays, and horn correction are all selectable via internal dip switches.

The XLR output connectors can be programmed to transmit either the highpass signal or the lowpass signal. the internal crossover to amplifier connection can also be programmed as either highpass or lowpass using a simple dip switch.

Specifications
Inputs and Outputs: Two balanced inputs (from std. input module), two ground compensated outputs
Input Impedance: more than 20K ohm
Output Impedance: less than 100 ohm
Crossover Frequencies: 80 Hz, 120 Hz, 500 Hz, 800 Hz, 1.2 kHz, 7 kHz
THD + Noise: Less than 0.009% (+4 dB in)
Signal to Noise Ratio: Typ. 106 dBu
Input and Output Levels: nominal +4 dB, max. +20 dBu
Low Frequency Alignment Times: off, 0.35 mSec, 0.71 mSec, 1.0 mSec
Horn Correction: proper EQ for JBL 2360 or 2380 horns
Rear Panel XLR Assignment: individual channel highpass or lowpass select
MPA Slot Type: upper slot (connects to standard lower input module)
Current Consumption: typ. 55 mA (+15v / -15v)


IM11 MPA Sub-Bass Crossover Module

Key Features:

When a sub-bass speaker is used, this module divides the frequencies so that only low frequencies are fed into the "host" amplifier, while all other frequencies are fed to the external XLR connectors for use by another amplifier.

This module offers crossover frequencies of 80 Hz, 120 Hz, or 250 Hz, as well as the ability to eliminate sub-sonic frequencies if needed. A sub-sonic filter can be set to cut-off frequencies from either 30 Hz or 40 Hz.

Specifications
Inputs and Outputs: Two balanced inputs (from std. input module), two ground compensated outputs
Input Impedance: more than 20K ohm
Output Impedance: less than 100 ohm
Crossover Frequencies: 80 Hz, 120 Hz, 250 Hz
THD + Noise: Less than 0.009% (+4 dB in)
Signal to Noise Ratio: Typ. 106 dBu
Input and Output Levels: nominal +4 dB, max. +20 dBu
Sub-sonic Filter: 30 Hz or 40 Hz
Rear Panel XLR: two channel higpass output
MPA Slot Type: upper slot (connects to standard lower input module)
Current Consumption: typ. 55 mA (+15v / -15v)


IM12 Cinema Crossover Module
IM12 Specification Sheet (Adobe Acrobat, 198kb)

Key Features:

The IM12 Cinema Crossover module is designed to work with JBL MPA-Series power amplifiers to provide signal processing for JBL cinema loudspeaker systems. The IM12 uses state-of-the-art electronic circuitry to provide the required cinema signal processing functions. The IM12 also provides addition valuable functions to those which are normally used in cinemas, such as transducer alignment delay and limiting to make the cinema sound system sound even better. The functions are configurable to match the exact requirements of the system. All settings are selectable via DIP switches and are protected from tampering once the IM12 is installed.

Specifications
Crossover Frequency: 500/800 Hz
Crossover Slope: 24 dB/octave, or Dual Slope Cinema Roll-off
Infrasonic Filter: 30/80 Hz
Low Frequency Delay: 1.9 mS (JBL "large-horn" system)
0.7 mS (JBL "small-horn" system)
0 mS (Bypass)
Subwoofer Output: 80 Hz (disables Infrasonic filter function)
CD Horn EQ: JBL "large-horn" system
JBL "small-horn" system
Bypass
Screen Loss EQ: In/Out
HF Level Balance: Continuously Variable
HF Limiter Range: Adjustable threshold, Limiting to -19 dB
JBL Amplifiers: MPA275, MPA400, MPA600, MPA750, MPA1100

Functions:


Copyright 2001 JBL Professional.
All rights reserved.