ST 2100 - Car stereo Macrom - Free user manual and instructions

Product Type	2-channel power amplifier for car audio
Brand	Macrom
Model	ST 2100
RMS Power (4 Ω)	2 x 100 W
RMS Power (2 Ω)	2 x 200 W
RMS Power Mono (4 Ω)	1 x 400 W
IHF 202 Power	500 W
Input Impedance	22 kΩ
Input Sensitivity	200 to 4000 mV
Frequency Response	10 - 50,000 Hz (±1 dB)
Total Harmonic Distortion (THD)	0.08%
Signal-to-Noise Ratio (IHF A)	Greater than 100 dB
Power Supply	14.4 V DC (11 - 16 V allowed)
Dimensions (W x H x D)	212 x 67 x 405 mm
Weight	4.7 kg
High-Pass Filter (HPF)	30 - 600 Hz, 12 dB/octave
Low-Pass Filter (LPF)	30 - 600 Hz, 12 dB/octave
Pre-Out Output	Yes, with Flat/HPF/LPF selector
RCA Inputs	Yes, gold-plated
Check Control Status Indicator	White LED (off), green (normal), red (protection)
Built-in Protections	Overheating, overload, short circuit
Gain Adjustment	Continuous, from 200 mV to 4 V
External Bass Control (EBC)	Yes, with dedicated connection port
Fuse	Yes, replace with identical amperage
Maintenance	Clean with a dry cloth. Avoid solvents.
Safety	Disconnect battery before installation. Observe polarity.
Repairability	Refer to a dealer or authorized MACROM service center.

Frequently Asked Questions - ST 2100 Macrom

How do I adjust the input sensitivity (gain) of the amplifier?

Set the volume of your head unit to three-quarters of maximum output. Then turn the amplifier's input gain control until you achieve the highest sound level without distortion. The sensitivity ranges from 200 mV to 4 V.

What do the different colors of the Check Control LED mean?

White: unit is off. Green: normal operation. Red: protection mode (overheating, overload, or short circuit). Once the issue is resolved, the unit resumes normal operation.

What protections are built into the Macrom ST 2100?

It has three protections: overheating (temporary shutdown if temperature exceeds limit), overload (if impedance < 1 Ω), and short circuit at output. Each protects internal components.

What is the minimum speaker impedance I can use?

In stereo mode, minimum impedance 2 Ω per channel. In bridged mono mode, minimum 4 Ω. In 3-channel configuration, total impedance must not drop below 2 Ω.

How do I connect the amplifier to the head unit?

Use the gold-plated RCA input connectors to connect the Pre-Outs of the head unit. Connect the REMOTE-ON wire to the remote turn-on output or automatic antenna output of the head unit.

Can I use the amplifier in mono mode?

Yes, thanks to the Stereo/Mono selector. In mono mode, use the left input (Left) to drive the amplifier. Mono power is 1 x 400 W at 4 Ω.

How do I configure the crossover filter?

Use the crossover selector on the amplifier: Flat (full range), Low-Pass (low-pass), or High-Pass (high-pass). The cutoff frequency is continuously adjustable from 30 to 600 Hz.

What is the recommended power supply voltage?

The nominal voltage is 14.4 V DC, with an allowed range of 11 to 16 V DC. Connect the +BATT wire directly to the battery with a fuse in line.

Where should I install the amplifier in the car?

Choose a location with good air circulation and efficient heat dissipation. Avoid damp areas. The interior temperature should be between -10°C and +60°C before turning on.

What should I do if the amplifier does not turn on?

Check the REMOTE-ON wire connection, the fuse condition (replace with same amperage), and the battery voltage. Ensure the Check Control LED is not red. If the problem persists, contact an authorized MACROM dealer.

USER MANUAL ST 2100 Macrom

a 1 kHz < 0.08% THD+N a 4 ohms 2 x 100W

a 1 kHz<0.5% THD+N a 2 ohms 2 x 200W

a 1 kHz<0.5% THD+N Mono a 4 ohms 1 x 400W

Macrom, who strive continually to achieve the ultimate in sound quality, have traditionally been a synonym for the very best in European sound and music reproduction. The fact that you have chosen this product means that you share our opinion. After reading this manual you will be in an even better position to appreciate all the advanced features in this new Amplifier.

This Amplifier incorporates an exceptional set of technical features, and for this reason all signal sources, loudspeakers and interconnecting elements must also be of the very highest quality. We recommend the use of Macrom high quality main subassemblies, electronic crossovers, loudspeaker systems, connecting leads and accessories. Similarly, because integration of these products is an extremely complex task, we advise you to leave the installation of this amplifier to your authorised MACROM dealer.

This Amplifier has no commands or controls that can be adjusted by the user, so read this manual very carefully, to familiarise yourself with the special features and functions of your new MACROM product. If in any doubt, contact your authorised MACROM dealer.

PRECAUTIONS

1. Just one faulty connection could damage the unit, so read the connection instructions provided in this manual very carefully.
2. Connect the battery lead to the (+) battery terminal last of all, and only after having completed and checked all the other connections.
3. Take care to install the amplifier in a position where both good air circulation and heat dissipation are guaranteed.
4. The fuses must always be replaced with fuses of identical ampere rating in order to prevent serious damage to the components. You should also first have the voltage regulator of your car checked. Never attempt to repair the unit yourself. Entrust any necessary repairs to a MACROM distributor or your local MACROM service centre.
5. To ensure the highest possible performance from this unit, try to obtain a temperature of between -10^ and +60^ inside your car before switching on the amplifier.

FEATURES

• I nput mode selector
• Flat, low-pass or high-pass filter selector
• Pre-output with "Flat, High or Low-Pass Filter" selector
• Continuous external control of the low frequency gain
• Peak noise detector
  • Continuous frequency control
  • Continuous sensitivity control
  • Current feed with Mos-Fet

- " Check Control" status indicator

• R emote-controlled start and stop

• Gold-plated RCA input terminals

• Professional gold-plated screw-type terminals

CONTROLS AND INDICATORS

1 · RCA input connectors: To connect the Pre output leads of the main unit to the amplifier input. These inputs control the final stages.
2 • Adjustment of the gain of the Input: Adjusts input sensitivity of amplifier, which can vary between 200 mV and 4V.

To adjust sensitivity, proceed as follows:

a) Set the volume control of your unit to 3/4 of its maximum output
b) Adjust the amplifier input gain controls until the maximum possible acoustic pressure has been obtained without any distortion.

3 · Stereo/Mono switch: changes the output mode of the amplifier between Stereo and Mono. If Mono is selected, the corresponding Left (mono) input is used to operate the amplifier.

4 • Crossover switch: selects the output mode of the amplifier by activating the Low-pass or High-pass filter.

a) Flat: the amplifier will reproduce the complete audio range in relation to the signal applied to the input.

b) Low-pass: activation of the low-pass filter, i.e. determination of the finishing-point of the low frequencies present at the outputs.

c) High-pass: activation of the low-pass filter, i.e. determination of the starting-point of the high frequencies present at the outputs.

5 • Continuous adjustment/control of the Low-Pass or High-Pass frequencies: once the low-pass or high-pass filter is inserted, the crossover frequency can be adjusted in continuous mode between 30 Hz and 600 Hz.

CONTROLS AND INDICATORS

6 • Continuous adjustment of the Pre-output Low-Pass or High-Pass frequencies: once

the high-pass or low-pass filter is inserted, the crossover frequency can be

adjusted between 30 Hz and 600 Hz in continuous mode.

7 • Pre-output Crossover selector: selects the Pre-output mode, activating the Low-Pass or High-Pass filter.

a) Flat: a signal will be present on the Pre-output, in relation to the signal applied at the input of the amplifier.

b) Low-Pass: activation of the low-pass filter, i.e. determination of the finishing-point of the low frequencies present at the Pre-output Outputs.

c) High-pass: activation of the low-pass filter, i.e. determination of the starting-point of the high frequencies present at the Pre-output Outputs.

8 • Pre-output Output Connector: it is possible to connect a supplementary amplifier for use according to a previously selected mode.

15 • Selector switch for the External Low Frequency Control: this switch activates or deactivates the external control of the low frequencies.

External Bass Control

16 · Port for EBC connection: By means of the appropriate EBC control

External Bass Control

MAXIM Min Max Peak

it is possible to act on the level of the low frequencies between 0dB and -40dB.

CONTROLS AND INDICATORS

9 • Speaker connectors: Outputs for connecting the loudspeakers.

The amplifier allows the loudspeakers to be connected with a minimum impedance of 2 Ohm for a channel in stereo configuration, and with an impedance of 4 Ohm for a "bridged" mono connection.

If the 3 channel configuration is to be used, the total impedance should not exceed the minimum value of 2 Ohm.

Make sure that the polarity of the connection between the loudspeakers is correct. Do not allow inadequately insulated leads to come into contact with Ground, any metallic parts of the car, or with each other.

graph TD
    A["Top Funnel"] --> B["Bridgehead"]
    B --> C["Car Icon L"]
    B --> D["Car Icon R"]

3-channel configuration 2-channel configuration 1-channel configuration

10 • Fuses: When replacing fuses, make sure that they are replaced with fuses of the same ampere rating. Use of the wrong type of fuse could seriously damage the components.
11 • + BATT connector: Connect the positive "+" of the battery directly, by means of a fuse located nearby, and use a lead having a sufficiently large cross-section to allow passage of the current. Do not connect this terminal to the car's own electrical circuit.
12 • REMOTE-ON connector: Connect this to the remote-on start-up output lead (remote starting switch) or to the automatic antenna wire running from the main unit. It will now be possible to turn the amplifier on and off from the main unit.
13 • GND connector: Attach this Ground connector, using a lead of adequate section, to a clean point on any metallic part of the car chassis, if possible to an already-installed screw. Never attach this clamp directly to the negative point of the battery, which could give rise to an unpleasant buzzing noise while the car is being driven.
14 · Check control indicator: This LED indicates the amplifier functioning status.

WHITE: The unit is switched off

GREEN: The amplifier is functioning perfectly

RED: the unit is in a state of protection.

The amplifier is equipped with three protection devices:

• Overheating: If errors have been made during installation, and the amplifier overheats, the unit will enter into a state of protection before any damage can occur. Once the temperature returns to normal and the errors have been rectified, the unit will automatically start to function normally once again.
• Overloading: If several loudspeakers have been connected to the amplifier and the total impedance drops below the 1 Ohm limit that it can handle, the amplifier goes into a state of protection. The main unit will have to be switched off and on again in order to restore the amplifier to normal functioning.
• Short circuit in an output: In the case of a short circuit in the loudspeaker outputs, the unit will go into a state of protection to avoid serious damage to the final transistors. Normal functioning will be restored when the short circuit has been dealt with and the main unit switched on again.

TECHNICAL DATA

Power IHF 202 500W

RMS Power at (12.5 Volts DC)

at 1 kHz < 0.08 % THD+N at 4 Ohm 2 x 100W

at 1 kHz < 0.5 % THD+N at 2 Ohm 2 x 200W

at 1 kHz < 0.5 % THD+N Mono at 4 Ohm 1 x 400W

Pre-Out Sensitivity 2V

High pass control, (30-600) Hz

Low pass control, (30-600) Hz

Crossover slope 12 dB/Octave

Response in frequency +/- 1 dB 10 - 50.000 Hz

Total harmonic distortion 0.08%

Weighted IHF A Signal-Noise Ratio

Input sensitivity - Impedance

100 dB

200-4000 mV/22 kOhm

Loudspeaker impedances

Stereo

min. 2 Ohms

Mono

min. 4 Ohms

Power supply

14.4 V DC (11 - 16 V permissible)

Weight

4,7 kgrs

Dimensions

212(L) × 67(A) × 405(P) mm

Due to the continual incorporation of improvements in this product, the characteristics and design may be subject to variation without prior notice.

EINFÜHRUNG

External Bass Control

External Bass Control

MAXON Min Max Peak

External Bass Control

External Bass Control

MAX Min Max Peak

CONTROLES ET INDICATEURS

graph TD
    A["Top Panel"] --> B["Left Panel"]
    A --> C["Right Panel"]
    B --> D["Bridged"]
    C --> D
    D --> E["Base Station 1"]
    D --> F["Base Station 2"]
    D --> G["Base Station 3"]

3-channel configuration 2-channel configuration 1-channel configuration

External Bass Control

External Bass Control

MAGGCM Min Max Peak

graph TD
    A["Top Left Panel"] --> B["B-jugod"]
    A --> C["R"]
    B --> D["Left Block L"]
    B --> E["Right Block R"]
    C --> F["Left Block L"]
    C --> G["Right Block R"]
    H["Bottom Row 1"] --> I["Left Block L"]
    H --> J["Right Block R"]

3-channel configuration 2-channel configuration 1-channel configuration