Macrom 44.13 - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The MACROM 44.13 is a programmable power amplifier designed for car audio systems, offering versatile output configurations and advanced features for high-quality sound reproduction. It is bridgeable for simultaneous stereo/mono output, features 2/4 input and 2/3/4 output options, an electronic crossover, a MOS-FET power supply, and discrete components in its final stage.

Function Description:

The 44.13 amplifier is engineered to deliver pure and stable sound qualities. It can operate in various channel configurations:

4/3/2 Channel Operation:
- 4-channel mode: 30 Watts RMS per channel.
- 3-channel mode: 30 Watts RMS on two stereo channels and 60 Watts RMS mono.
- 2-channel mode: 60 Watts RMS on two stereo channels.
No Amperage Limitations: Unlike traditional amplifiers that incorporate amperage limitation circuits, the 44.13 avoids untimely clipping and low transient response. This design ensures a low T.I.M. (Transient Intermodulation Distortion) effect, excellent transient response, and perfect sound quality.
Input Mode Selector: Allows the user to choose between 2 or 4 input signals to the amplifier, providing flexibility for different head unit setups.
Output Mode Selector: Enables the user to specify the number and configuration of the outputs, adapting to various speaker setups.
Independent Selectors for Crossover Frequencies: This control allows for independent selection of Low Pass and High Pass crossover frequencies at 80 or 120 Hz, enabling precise audio filtering for different speaker types (e.g., woofers, tweeters).
Remote ON/OFF: The amplifier automatically switches on or off in conjunction with the head unit, simplifying operation.
RCA Input Sensitivity: The input sensitivity is adjustable from 100 mV to 2 V, with a central position set at 500 mV for optimal coupling with other MACROM sources. This wide adjustment range ensures compatibility with various head units available on the market.
Status Indicator: An LED provides visual feedback on the amplifier's current status:
- Green (fixed): Unit is operating perfectly.
- Green (blinking): Unit is in protection mode, indicating an issue.
- White: Unit is off.
Triple Protection: The unit incorporates three protection devices to safeguard against damage:
- Soft Start: Powers gradually to prevent damage to speakers when the head unit is switched on with high volume.
- Overheating Protection: Enters protection mode if temperatures become too high due to improper installation. Normal operation resumes once the temperature returns to normal.
- Output Short Circuit Protection: Enters protection mode in case of a short circuit at speaker outlets, preventing damage to end-stage transistors. Normal operation resumes once the short circuit is eliminated.
Final Stage with Discreet Components (Transistors): Utilizes individual transistors in the final stage for enhanced performance and sound quality.
MOS-FET Supply Unit: A highly sophisticated C-MOS-FET supply unit provides constant performance, high efficiency, lower current consumption, a linear and ample frequency response, and high dynamics.
Capacitive/Inductive Power Supply Filter: This filter reduces radio frequency interferences (RFI) and eliminates system noises, such as alternator whine.
Gold-Plated RCA-Connectors: Ensures optimal signal transfer and corrosion resistance.
Gold-Plated Screw-Type Speaker Output Connections: Provides secure and high-quality connections for speaker wires.

Important Technical Specifications:

Maximum Power: 45 Watts x 4
Nominal RMS Power (4 Ohm, 20Hz to 20 kHz at 0.1% THD):
- "4 CH Output" mode: 30 Watts x 4
- "3 CH Output" mode: 30 Watts x 2, 60 Watts x 1
- "2 CH Output" mode: 60 Watts x 2
Frequency Response: +0, -1dB, 10 - 45,000 Hz
S/N IHF-A-weighted: 100 dB
Crossover Frequencies:
- LOW-PASS: 80-120 Hz
- HIGH-PASS: 80-120 Hz
Crossover Slope: 12dB/oct.
Input Sensitivity/Impedance (for nominal power output):
- Control in central position (click): 500mV/10 kOhm
- Variable control: 100-2,000 mV/10 kOhm
Speaker Impedance:
- 2CH 4 Ohm
- 3CH 2 Ohm 4 Ohm (bridged, mono)
- 4CH 2-4 Ohm
Power Supply (negative ground): 14.0V DC (11-16V permissible)
Net Weight: 3.2 kg
Chassis Size: 235(W) x 50(H) x 217(D) mm

Usage Features:

Flexible Input/Output Configurations: The amplifier supports 2 or 4 input channels and 2, 3, or 4 output channels, allowing for various system designs, from a simple 2-channel stereo to a multi-amplifying system with dedicated subwoofer outputs.
Crossover Control: Independent high-pass and low-pass crossover selectors (80 Hz or 120 Hz) enable users to optimize sound distribution to different speakers, such as directing low frequencies to subwoofers and medium-high frequencies to full-range or component speakers.
Gain Control: Input gain adjustments ensure compatibility with different head unit output levels, allowing for maximum sound level without distortion.
Bridged Mono Output: The amplifier can be configured to bridge channels for a powerful mono output, ideal for driving subwoofers.
User-Friendly Setup: The manual provides clear instructions for connecting leads and setting up the amplifier, including specific configurations for 4CH input/output, 3CH output, and 2CH output modes.

Maintenance Features:

Fuse Replacement: In case of fuse replacement, it is crucial to use a fuse of the same amperage to prevent damage to the unit's components. Repeated fuse blowing indicates an underlying electrical issue that requires professional inspection.
Proper Installation for Heat Dissipation: The amplifier must be installed in a location with good air circulation and heat dissipation (e.g., the boot, uncovered by carpet) to prevent overheating and ensure optimal performance.
Secure Connections: All connections, especially power leads, must be clean and secure to avoid damage to the unit. The positive battery lead should be the last to be connected, and a fuse (not provided) should be installed as close as possible to the battery.
Grounding: The ground lead must be securely connected to a clean spot on the car chassis, ensuring electrical continuity with the battery's negative terminal.
Professional Repair: Users are advised not to attempt repairs themselves. Any issues requiring repair should be handled by a MACROM dealer or authorized service station.
Operating Temperature Range: For best performance, the internal car temperature should be between -10°C and +60°C before switching on the unit.