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
dissipation.
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
• LOW-PASS FILTER THAT CAN BE SET AT THE END SECTION
• PRE-OUTPUT WITH “FLAT, HIGH- OR LOW-PASS FILTER” SELECTOR
• CONTINUOUS AND INDEPENDENT ADJUSTMENTS OF THE FREQUENCY CUTOFFS
• INPUT MODE SELECTOR: MONO, STEREO OR MIX
• CONTINUOUS ADJUSTMENT OF INPUT SENSITIVITY
• MOS-FET POWER SUPPLY
• “CHECK CONTROL” STATE INDICATOR
• REMOTE ON AND OFF
• GOLD-PLATED RCA INPUT CONNECTIONS
• PROFESSIONAL GOLD-PLATED SCREW-TYPE SUPPLY TERMINALS
6
CONTROLS AND INDICATORS
600Hz30Hz
150Hz
33Hz
36Hz
45Hz
70Hz
100Hz250Hz
340Hz
470Hz
520Hz
580Hz
Flat Low
Flat Low
20Hz 20kHz
20Hz 30>600Hz
L(mono) ST L+R
L(mono) ST L+R
L(mono) ST L+R
20Hz 20kHz
20Hz 30>600Hz
Flat Low High
Flat Low High
Flat Low High
30>600Hz 20kHz
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.
7
CONTROLS AND INDICATORS
++
+
BRIDGED
LR
++
+
BRIDGED
LR
++
+
BRIDGED
LR
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.
8
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