42.29 - Car stereo Macrom - Free user manual and instructions

USER MANUAL 42.29 Macrom

Low Pass HighPass Low Pass HighPass O/M 42.29 26/06/02 10:19 Page 56 INTRODUCTION The name of MACROM has always been the synonym of tradition, of a European acoustic and musical tradition in the pursue of the topmost sound quality and the fact that you chose to buy this product makes it clear that you due agree with us. With the help of this manual you will be able to maximise the enjoyment that you will get out of your new 42.29 Mono Amplifier. This amplifier incorporates many advanced technical features and performances. Therefore, it is essential that all signals sources, speakers and interconnection devices are of the highest sonic quality. We strongly recommend the use of MACROM head units, power amplifiers, speaker systems, high-quality interconnection cables and accessories, because the integration of all these products is very complex. We therefore advise that you have installed the 42.29 by your MACROM dealer. This product has no user-adjustable controls; read this manual carefully in order to become well acquainted with all the special features and functions of your new MACROM 42.29. Do not hesitate to contact your MACROM dealer should you have any problem. PRECAUTIONS

1. The unit may be damaged by wrong lead connection, therefore read carefully the

instructions of this manual for the correct connection of the leads.

2. The last lead to be connected is the one to the positive (+) terminal of the battery; connect

this lead only after having completed and checked all other connections.

3. Be sure to install the crossover in a position with good air circulation and good heat

4. In case of fuse replacement make sure to replace it with a fuse of the same amperage. If

fuses blow more than once, carefully check all electrical connections. Also have your car’s voltage regulator checked. Do not attempt to repair the unit yourself. If repairs are ever needed, take the unit to your MACROM dealer or to your nearest MACROM service station.

5. In order to get the best possible performance from this unit, make sure that the

temperature inside your car is within the range of -10° C and +60° C before you switch the unit on. Good air circulation is essential to prevent heat build-up inside the unit. FEATURES

1 • RCA INPUT CONNECTORS: connect the pre-output leads of the head unit to the input connectors. 2 • INPUT MODE SELECTOR: allows to select the amplifier’s configuration as follows: a) STEREO “ST” when the amplifier is used as a two-channel stereo system (right + left); b) MONO (L mono) when the amplifier is driven by one input signal “Left” and outputs are mono-bridged. NOTE: in this configuration, no signal is present at the “Right” pre-output RCA output connection; c) MIX “L+R”: when the amplifier is designed to drive one or more subwoofers according to the 1-, 2- or 3-channel configurations. Thus, the inputs signals will be blended into one signal. NOTE: anyway, the signals present at the Pre-output outputs will always be stereo. 3 • INPUT GAIN ADJUSTMENT CONTROL: input sensitivity ranges from 200 mV to 2V. Set the mid position for all MACROM units. In case the amplifier is to be connected to a head unit that is not of MACROM make but is fitted with preamplified RCA outputs, proceed as follows: a) set the volume control of your head unit to 3/4 of maximum ouput level; b) set the input gain control to the point where the maximum sound level with no distortion is obtained. 4 • LOW-PASS SELECTOR SWITCH: it allows to select the amplifier’s output mode by activating the Low-Pass crossover. a) Flat: the amplifier reproduces the whole range of frequencies from 20 Hz to 20kHz b) Low: the amplifier reproduces low frequencies only. 5 • LOW-PASS FREQUENCY ADJUSTMENT: allows the continuous adjustment of the low-pass frequency between 30 and 600 Hz, to determine the end point of the audio range present at the amplifier’s outputs and at the Pre-output outputs should the low-pass filter be selected. 6 • HI-PASS FREQUENCY ADJUSTMENT: allows the continuous adjustment of the high-pass frequency between 30 and 600 Hz, to determine the starting value of the audio range present at the Pre-Output outputs. 7 • PRE-OUTPUT SELECTOR SWITCH: allows to select the Pre-output output mode as follows: a) FLAT: a signal having the same form and amplitude as the input signal is present at the Pre-output outputs; b) LOW: a low-pass signal is present at the Pre-output outputs in order to drive an additional amplifier. Frequencies can be adjusted by means of the LOW-PASS FREQUENCY “5” control; c) HIGH: a high-pass signal is present at the Pre-output outputs in order to drive an additional amplifier. Frequencies can be adjusted by means of the HIGH-PASS FREQUENCY “6” control. 600Hz30Hz 150Hz 33Hz 36Hz 45Hz 70Hz 100Hz 250Hz 340Hz 470Hz 520Hz 580Hz Flat Low Flat Low 20Hz 20kHz20Hz 30>600Hz L(mono) ST L+R L(mono) ST L+R L(mono) ST L+R 20Hz 20kHz20Hz 30>600Hz Flat Low High Flat Low High Flat Low High 30>600Hz 20kHz O/M 42.29 26/06/02 10:19 Page 78

CONTROLS AND INDICATORS

8 • PRE-OUTPUT RCA OUTPUT CONNECTORS: connect to an additional amplifier to be used according to the mode previously selected. 9 • SPEAKER CONNECTOR: outputs for speakers connection. The amplifier allows to connect speakers with minimum 1-ohm impedance per channel in stereo configuration and with minimum 2-ohm impedance in mono-bridged configuration. Should the 3-channel configuration be used, total impedance must not exceed the minimum 2-ohm value. Be sure to keep the right polarity and phase in connecting the speakers. Avoid any contact between poorly insulated wires and the car’s ground or metal pieces and between the wires themselves. 10 • FUSE: in case of fuse replacement make sure to use fuses of the same amperage. The use of fuses with the wrong amperage may seriously damage the components of the unit. 11 • BAT + CONNECTOR: to be connected directly to battery + by means of a fuse located close to the battery itself. Utilize a cable having an adequate section. Do not connect this cable to the car’s electrical system wiring (eg.: dome-light circuit, car radio etc.) 12 • GND CONNECTOR: connect the ground terminal to a clean base metal part of the vehicle chassis (if possibile, to an existing screw). Utilize a cable having an adequate section. 13 • REMOTE-ON CONNECTOR: to be connected either to the remote switch-on output lead or to the output lead of the power antenna coming from the head unit. As a resul, the 42.29 will be switched on and off simultaneously with the head unit. 14 • CHECK CONTROL LED: this led shows the amplifier’s status of operation: WHITE: the unit is off GREEN: the unit is working OK RED: the unit has entered the protection mode The 42.29 is equipped with three different protection devices: Overheating: in case of wrong installation the unit enters the protection mode before being damaged. As soon as the temperature returns to normal values, the unit resumes normal operation. Overload: if several speakers are connected to the amplifier and the total impedance decreases below the allowable threshold (0.5 - 1 ohm), the amplifier enters automatically the protection mode to avoid any damage. To restore normal operation the head unit has to be switched off and then on again. Output short circuit: in case of a short circuit at the speakers outputs, the unit enters the protection mode to avoid serious damage to the end stage transistors. Normal operation is restored by eliminating the short circuit and by switching on the head unit again.