42.26 - Car radio Macrom - Free user manual and instructions

Product Type	Car audio power amplifier
Model	42.26 (variant of models 42.15/42.17)
Brand	Macrom
Stereo output power (max)	70 W x 2 (42.15) / 100 W x 2 (42.17)
Bridged output power (max)	150 W (42.15) / 200 W (42.17) at 4 ohms
RMS stereo power (4 ohms, 1 kHz, 1% THD)	45 W x 2 (42.15) / 65 W x 2 (42.17)
RMS stereo power (4 ohms, 20 Hz-20 kHz, 0.05% THD)	35 W x 2 (42.15) / 50 W x 2 (42.17)
Speaker impedance stereo	4 or 2 ohms
Speaker impedance bridged	4 ohms
Frequency response	10 Hz - 50 kHz (+0/-1 dB)
Signal-to-noise ratio	105 dB (IHF A-weighted)
Input sensitivity	500 mV (center position), adjustable from 100 mV to 2 V
Input impedance	10 kOhms
Power supply	14 V DC (11-16 V tolerant), negative ground
Fuse	20/25 A
Net weight	1.3 kg (42.15) / 1.5 kg (42.17)
Dimensions (W x D x H)	Approximately 200 x 150 x 50 mm (estimation)
Protections	Soft start, overheat, output short circuit
Input connectors	Gold-plated RCA
Power connectors	Professional gold-plated screw terminals
Speaker connectors	Gold-plated screw terminals
Power supply type	MOSFET
Power supply filter	Capacitive/inductive for RF interference reduction
Input mode	Selector: STEREO, L-MONO, L+R

Frequently Asked Questions - 42.26 Macrom

How to properly install the amplifier?

Install the amplifier in a well-ventilated area, preferably in the trunk. Avoid covering it. Secure it with the provided screws using a ground screw on a metal part of the chassis for good contact.

What is the maximum output power?

In stereo, the maximum power is 70 W x 2 (model 42.15) or 100 W x 2 (model 42.17). In bridge (mono), it reaches 150 W (42.15) or 200 W (42.17) at 4 ohms.

How to adjust the input sensitivity?

Set the car radio volume to 3/4 of maximum. Turn the gain control with a screwdriver until you achieve the maximum sound level without distortion. The center position corresponds to 500 mV.

What to do if fuses blow?

Replace fuses with the same amperage (20/25 A). If the problem persists, check all electrical connections and have the car's voltage regulator checked by a professional.

How to connect speakers in bridge (BTL)?

Select L-MONO mode. Connect the speaker between L+ (left channel positive) and R- (right channel negative). Use a second amplifier for the other speaker if you want a stereo image.

What types of protection does the device have?

The amplifier is equipped with three protections: Soft Start (gradual start), overheat (shutdown if temperature too high), and output short circuit (transistor protection).

Where to place the amplifier in the car?

Place it in a location with good air circulation, such as the trunk, to avoid overheating. Do not cover it with carpet or other objects. Ensure the interior temperature is between -10°C and +60°C before turning it on.

Can I use the amplifier with any car radio?

Yes, the adjustable input sensitivity (100 mV to 2 V) allows connecting the amplifier to most car radios with RCA outputs. For car radios without RCA outputs, you can use a speaker-level adapter.

How to connect the remote turn-on wire (REMOTE)?

Connect the REMOTE terminal to the car radio's power antenna output. If your car radio does not have this output, install an SPST switch between a +12 V source and the REMOTE terminal to manually turn on the amplifier.

What is the difference between models 42.15 and 42.17?

The 42.17 model offers higher power: 100 W x 2 stereo (max) compared to 70 W x 2 for the 42.15, and 200 W bridged compared to 150 W. The weight is also slightly higher (1.5 kg vs 1.3 kg).

USER MANUAL 42.26 Macrom

Abstract black geometric shapes on white background (no text or symbols)

CONTENTS / INHALT / TABLE DE MATIERES / INDICE

• INSTALLATION / EINBAU / INSTALLATION / INSTALLAZIONE / INSTALACION .... 3
• CONTROLS AND INDICATORS / BEDIENUNGSELEMENTE UND ANZEIGEN / COMMNDES ET INDICATEURES / CONTROLLI E INDICATORI / CONTROLES E INDICATORES 4
• CONNECTIONS / ANSCHLUSSE / CONNEXIONS / COLLEGAMENTI / CONEXIONES 4
- SYSTEM CHART / SYSTEM-DIAGRAMM / EXAMPLES DE SYSTEME / DIAGRAMMA DI SISTEMA / DIAGRAMA DEL SISTEMA 5-6

"ENGLISH"

INTRODUCTION 7
PRECAUTIONS 7
FEATURES 8-9
CONTROLS AND INDICATORS 9
INSTALLATION 9
CONNECTIONS 10
REGULATION AND SWITCH 11
TECHNICAL DATA 12

" DEUTSCH "

CONNECTIONS / ANSCHLUSSE / CONNEXIONS COLLEGAMENTI / CONEXIONES

Fig. 3./ Abb. 3.

SYSTEM DIAGRAM / SYSTEM-DIAGRAMM / EXEMPLES DE SYSTEME DIAGRAMMA DI SISTEMA / DIAGRAMA DEL SISTEMA

3-CHANNEL CONFIGURATION

Left channel

Right channel

graph TD
    A["Mono"] --> B["BRIDGET"]
    B --> C["L"]
    B --> D["R"]
    C --> E["Output"]
    D --> F["Output"]

Left Right

2-CHANNEL CONFIGURATION

Left channel

Right channel

Left Right

1-CHANNEL CONFIGURATION

Left channel

Note: For the other channel another amplifier must to be used in same way.

SYSTEM CHART / SYSTEM-DIAGRAMM / EXEMPLES DE SYSTEME DIAGRAMMA DI SISTEMA / DIAGRAMA DEL SISTEMA

Two channel configuration

graph TD
    A["57.00"] --> B["Speaker 1"]
    C["59.10"] --> D["Speaker 2"]
    E["59.16"] --> F["Speaker 3"]
    B --> G["Power Amplifier 42.24 - 42.26"]
    D --> G
    F --> G
    G --> H["Audio Signal"]
    H --> I["Speaker 1"]
    I --> J["Speaker 2"]
    J --> K["Speaker 3"]
    K --> L["Speaker 4"]
    M["LEFT RIGHT"] --> N["Speaker 1"]
    O["Left Right"] --> P["Speaker 2"]
    Q["Left Right"] --> R["Speaker 3"]

Three channel passive configuration

graph TD
    A["Speaker 57.00"] --> B["95.83 95.83"]
    C["Speaker 59.10"] --> B
    D["Speaker 59.16"] --> B
    B --> E["Audio Signal"]
    E --> F["Power Amplifier 42.24 - 42.26"]
    F --> G["Coil 5mH"]
    G --> H["Left Right MONO"]
    F --> I["59.25"]
    F --> J["59.25"]
    F --> K["57.00"]
    F --> L["59.10"]
    F --> M["59.16"]

INTRODUCTION

For us at MACROM the achievement of the best sound quality is one of our greatest concerns. In buying the Digital Ready amplifier MACROM 42.24/42.26 we realize that this is also your concern. This unit offers 60/80 Watt max. per channel at 4 Ohm or 125/156 Watt max. when mono-bridged with pure and stable sound qualities.

This instruction manual has been prepared in order to help you to make the most of the outstanding performances and the advanced features and functions of your new amp.

We advise you to read these instructions carefully to familialise yourself with all the special feature of your 42.24/42.26

Please report any problem to your nearest MACROM dealer.

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. Due to the power of the 42.24/42.26 it is imperative that all connections are clean and secure in order to avoid damage to the unit.
4. Be sure to install the amplifier in a position with good air circulation and good heat dissipation.
5. 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. 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.
6. In order to obtain 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

The amplifier can be operated as a stereo or a as mono-bridged amplifier thus doubling the output power independently from the input mode; the power can be subdivided as follows, according to your needs:

a) 60/80 Watts for each one of the two channels
b) 60/80 Watts for two stereo channels, and 125/156 Watts mono
c) 125/156 Watts for one mono channel

• INPUT MODE SELECTOR

This switch allows the user to specify the input signal to the amplifier.

a) STEREO MODE
b) LEFT MODE (L - MONO)
c) LEFT + RIGHT MODE (L+R)

• END STAGE WITH DISCRETE COMPONENTS (TRANSISTORS)

• HIGH PERFORMANCES, LOW NOISE LEVEL, PASSIVE AND ACTIVE COMPONENTS

• NO CURRENT LIMITATIONS

The current limitation circuits incorporated in traditional amplifiers may cause untimely clipping and a low transient response. The absence of such circuits assures a low T.I.M. effect, an excellent transient response and a perfect sound quality.

• RCA INPUT SENSITIVITY

The new amp has a 500mVsensitivity for ideal coupling with MACROM sources and, however, it is possible to regulate the sensitivity from 100mV to 2V to facilitate coupling with any other source present on the market.

• REMOTE ON AND OFF

On switching the head unit on or off, the amplifier is automatically switched on or off.

- ON/OFF INDICATOR

• THREEFOLD PROTECTION

Your unit is provided with three different protection devices, as befits all high-end products. SOFT START: the amp powers gradually in order to avoid damage to the speakers in case the head unit is switched on with the volume control set to maximum.

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.

OUTPUT SHORT CIRCUIT: in case of a short circuit at the speaker outlets the unit enters the protection mode in order to avoid serious damage to the end-stage transistors. Normal operation is resumed on eliminating the short circuit.

• CAPACITIVE/INDUCTIVE POWER SUPPLY FILTER

This filter reduces radio frequency interferences (RFI) and cuts off system noises (i.e. the whine of the alternator).

FEATURES

• MOS-FET Power Supply

The 42.24/42.26 's great power is obtained by means of a special C-Mos-Fet supply unit which offers constant efficiency and requires low electrical input. The results are excellent performances, a linear and wide frequency response with high dynamics.

• GOLD-PLATED RCA INPUT CONNECTIONS

• PROFESSIONAL GOLD-PLATED SCREW-TYPE SUPPLY TERMINALS

• GOLD-PLATED SCREW-TYPE SPEAKER OUTPUT CONNECTIONS

• SPEAKER IMPEDANCE

4 or 2 Ohm for stereo operation, 4 Ohm if mono-bridged

CONTROLS AND INDICATORS

CONTROLS AND INDICATORS (Fig. 2, page 4)

1 ON/OFF indicator

2 Stereo or Mono input signal connector

3 Stereo or Mono input signal selector

4 Input gain control

5 Speaker output connector board

6 Fuse

7 Power supply connector board

INSTALLATION

INSTALLATION (Fig. 1, page 3)

Due to the high output power of the amplifier a great amount of heat is generated when the unit is in use. It is therefore necessary to install the unit in a position with good air circulation otherwise the amp will enter the protection mode. The best place to install the amplifier is in the trunk; avoid covering the amp.

1. Place the amplifier at the point of installation chosen and mark the position of the four securing screws provided.
2. Drill the screw holes.
3. Place the amp in the correct position and fit the four tapping screws in.

NOTE: Connect the ground lead to a screw already fixed to the metallic chassis of the car (indicated by *) in order to ensure a good ground contact.

CONNECTIONS

CONNECTIONS (Fig. 3 Pag. 4)

① Positive output terminal for left speaker or positive output terminal if used in MONO
② Negative output terminal for left speaker
③ Positive output terminal for right speaker
④ Negative output terminal for right speaker or negative output terminal if used in MONO
⑤ RCA-type input connector, left channel or mono
⑥ RCA-type input connector, right channel
⑦ 20/25 Ampere fuse
⑧ Feed terminal + 12 V to the battery
Connect this terminal directly to a positive (+) terminal of the battery by means of a lead responding to the amplifiers power requirements.
⑨ Terminal for the connection of the negative ground lead
⑩ Terminal for REMOTE switch-on

1. Battery lead. Connect this terminal (+BAT) ^⑧ directly to the battery cable of the car, by using an adequately sectioned cable (yellow).
   Do not connect this lead to circuits existing within the electric system of the car. In order to avoid damage to the car it is imperative that this lead be fitted with a fuse (not supplied) as near as possible to the car's battery. This connection is to be carried out last.
2. REMOTE switch-on lead (blue). Connect this lead to the remote switch-on lead or connect the control lead of the power antenna coming from the head unit to the REMOTE terminal ⑩.
   NOTE: If this lead is not connected, the amplifier will not be switched on when the head unit is switched on. If your head unit is not fitted with an outlet for a power antenna, a quick-break lever switch (SPST) should be installed between the power source (+12 V) and the remote switch-on lead and connected to the REMOTE ⑩ terminal so as to allow the manual activation of the amplifier.
3. Ground lead. Secure the ground lead to a clean spot on the car chassis and to the GND terminal ⑨. Make sure that there is electric continuity between this spot and the negative terminal of the battery. Use the shortest possible ground cable and if more than one amp should be used, connect the relative ground to one sole point.
4. FUSE. In case of fuse replacement be sure to use fuses of the same amperage.
   The use of fuses with the wrong amperage may seriously damage the components of the unit.
5. SPEAKER OUTLET TERMINALS. Be sure to keep the right polarity and phase in connecting the speakers. This includes the control of the right polarity, positive (+) and negative (-). NOTE: Avoid any contact between stripped wires and the ground lead.
6. RCA INPUT CONNECTORS. The line output leads of your head unit should be connected to the RCA input connectors, respectively RCA right ≈ and RCA left ⑤, by means of a RCA extension cable (e.g. 90.05-90.10-90.25-90.50 by MACROM). Be sure to respect the right channel designation: left (white) and right (red).

ADJUSTMENTS AND SWITCHES

INPUT SELECTOR SWITCH

a) STEREO MODE. Select the "ST" (mid) position when the amplifier is used as a 2-channel stereo system.
Note: Even in this case the connection is possible L + R -.

b) LEFT MODE "L - MONO". Select the "L - Mono" position when the amplifier is used for only one channel of the stereo system or for one bridged channel.

Note: Connect the leads coming from one speaker to the terminals (L+ R-) in order to obtain a BTL-connection. In case stereo output is requested, connect a second 42.24 / 42.26 in the same way to the other speaker.

c) L + R MODE. Select the "L+R" position when the amplifier is used for a subwoofer system using the right and left channels. Thus, the two inputs are blended into one mono output signal divided between 2 channels or, one double power channel if the Sub Woofer is connected to the central channel L + R.

INPUT GAIN ADJUSTMENT CONTROL

In the mid position an input sensitivity of 500 mV is selected corresponding to the preamplified outputs of MACROM products.

If 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) Adjust the volume control of your head unit to 3/4 of a turn from the maximum output level.
b) Turn the input control by means of a screwdriver and adjust the input gain from 0.1 V to 2 V to the maximum sound level where no distortion occurs.

TECHNICAL DATA

42.24 STEREO Power Output

Maximum power 60Wx2

Nominal RMS 4 Ohm, 20 Hz to 20 kHz at 0,05% THD ..... 45Wx2

Nominal RMS 2 Ohm, 20 Hz to 20 kHz at 0,05% THD ..... 75Wx2

BRIDGED Power Output

Maximum power, 4 Ohm, 1 kHz 125W

42.26 STEREO Power Output

Maximum power 80Wx2

Nominal RMS 4 Ohm, 20 Hz to 20 kHz at 0,05% THD ..... 65Wx2

Nominal RMS 2 Ohm, 20 Hz to 20 kHz at 0,05% THD ...... 80Wx2

BRIDGED Power Output

Maximum power, 4 Ohm, 1 kHz 156W

Frequency response +0, -1dB 10-50,000 Hz

S/N (signal to noise ratio) INFA-weighted 105 dB

Input sensitivity/Impedance

(for nominal power output)

Control in mid position 500 mV/10k Ohm

Variable control 100-2,000mV/10k Ohm

Speaker impedance 4 or 2 Ohm (stereo)

4 Ohm (bridged, mono)

Power supply (negative ground) 14.0V DC (11-16 V permissible)

Net Weight

42.24....1.6 kg

42.26....1.8 kg

Chassis size

42.24....217(L)x50(H)x150(P) mm

42.26....217(L)x50(H)x190(P) mm

Due to continuing improvement, the features and the design are subject to change without notice.

EINFÜHRUNG

Maximum, 4 Ohm, 1 kHz 200W

42.15 150(L)x50 (H)x217(P) mm

42.17 180(L)x50 (H)x217(P) mm

Nominale RMS 4 Ohms, 1 kHz at 1% THD 45Wx2

Nominale RMS 4 Ohms, 20Hz to 20 kHz at 0.05% THD ..... 35Wx2

Power Output a PONTE

Nominale RMS 4 Ohms, 1 kHz at 1% THD 65Wx2

Nominale RMS 4 Ohms, 20Hz to 20 kHz at 0.05% THD ..... 50Wx2

Power Output a PONTE

42.15 150 (L) x 50 (A) x 217 (P) mm

42.17 180 (L) x 50 (A) x 217 (P) mm

Nominal RMS, 4 Ohms, 1 kHz a 1% THD 45Wx2

Nominal RMS, 4 Ohms, 20 Hz a 20 kHz a 0,05% THD ..... 35Wx2

Nominal RMS, 4 Ohms, 1 kHz a 1% THD 65Wx2

Nominal RMS, 4 Ohms, 20 Hz a 20 kHz a 0,05% THD ..... 50Wx2

42.15 150(L)x50(A)x217(P) mm

42.17 180(L)x50(A)x217(P) mm