Steg K4.02 Car Audio Amplifier
520,00 €
The Steg K4.02 is a four-channel car audio amplifier designed to power a multichannel or bridged system. According to the seller, it supports 1-ohm stereo and 2-ohm bridged operation. Its 0.2-5 V RMS input sensitivity helps match the gain to the audio source, while dual crossover frequency adjustment allows the reproduced frequency ranges to be adapted to the connected speakers.
The Steg K4.02 amplifier is a four-channel car audio power amplifier. It is designed for systems that need to drive several pairs of speakers or a bridged load. The main factors to consider when choosing this model are its different load configurations, dual crossover frequency adjustment, and wide input sensitivity range.
The stated power ratings apply at a supply voltage of 11-14.4 V. These measurement conditions must therefore be considered when comparing this model with other amplifiers. The specifications for this exact model have not been independently verified and are presented according to the seller’s information.
Purpose and Channel Planning
Four channels allow the left and right front and rear speakers to be driven separately. A pair of channels can also be used in bridged mode with a 2-ohm load.
For 1-ohm stereo operation, the stated output is 2 × 420 W RMS. This figure must not be interpreted as four-channel output into a 1-ohm load. That distinction is important when planning the speaker wiring arrangement and deciding how the available channels will be used.
Power and Permitted Loads
Into a 4-ohm load, the amplifier delivers a stated 4 × 115 W RMS. With a 2-ohm load, the specified output is 4 × 210 W RMS. Lower impedance allows more power to be produced, but it also places a greater load on both the amplifier and the vehicle’s electrical system.
Before connecting several speakers to one channel, calculate their combined impedance. Parallel and series wiring change the resulting load in different ways. The selected wiring arrangement must comply with the requirements of the specific stereo or bridged operating mode.
Connections and System Expansion
Serial Power is a separate connection for the STEG system. It should not be confused with an audio signal input or speaker output. This connection is relevant when planning a corresponding chain of STEG equipment.
The Steg Link connection was designed to link the amplifier to a personal computer. This setup method requires the correct cable and compatible software. Compatibility of that software with modern operating systems is not guaranteed.
SMMS stands for STEG Multiway Modular System. It allows the amplifier to be planned as part of the manufacturer’s modular audio system. Additional modules should not be assumed to be included as standard equipment.
Input Sensitivity and Crossover Setup
The input sensitivity can be adjusted from 0.2 to 5 V RMS. It should be matched to the output voltage of the source unit. This adjustment is intended for signal-level matching and must not be treated as a volume control.
Begin with a lower gain setting corresponding to a higher voltage value. Then increase the gain gradually while monitoring the clarity of the sound. This approach reduces the likelihood of incorrect level matching and distortion occurring prematurely.
The crossover provides dual frequency adjustment. Choose the initial settings according to the operating range of the connected speakers. Afterward, adjust the frequencies in small steps and listen to how the frequency ranges reproduced by the individual channels blend together.
The amplifier can store user and installation data. Stored data can be protected with a password. This is useful when carefully tuned settings need to be protected against accidental changes.
Power Supply and Protection Management
The stabilized power supply maintains stabilization at an 11 V battery voltage. Protection functions are managed by a microprocessor. This helps monitor the amplifier’s operating condition, but it does not replace a correctly installed power circuit in the vehicle.
The power cable cross-section must be selected according to the system load and cable length. A protective fuse must be installed close to the battery. The amplifier also uses a dual forced IntelliSpeed system.
Installation Location
The 340 × 56 × 232 mm enclosure requires sufficient mounting space as well as room for connecting the cables. The amplifier weighs 6.47 kg, so it must be secured to a rigid mounting surface.
Do not cover the enclosure with carpet or place it inside a completely sealed compartment. Leave adequate clearance around the amplifier for air circulation. It is also advisable to route signal cables away from the main power cables.
This model is made in Italy and is equipped with a digital serial number.
Technical Specifications
| Model | Steg K4.02 |
|---|---|
| Type | Four-channel car audio power amplifier |
| Power into 4 ohms | 4 × 115 W RMS at 11-14.4 V |
| Power into 2 ohms | 4 × 210 W RMS at 11-14.4 V |
| Power into 1 ohm | 2 × 420 W RMS at 11-14.4 V |
| Stereo mode | Supports a 1-ohm load according to the seller |
| Bridged mode | Supports a 2-ohm load according to the seller |
| Input sensitivity | 0.2-5 V RMS |
| Crossover | Dual frequency adjustment |
| Serial Power | Yes |
| Steg Link | Connection for a personal computer |
| Modular system | STEG Multiway Modular System, SMMS |
| Power supply | Stabilized at an 11 V battery voltage |
| Protection management | Microprocessor-controlled |
| Data storage | User and installation data |
| Data protection | Password protection |
| Identification | Digital serial number |
| IntelliSpeed | Dual forced system |
| Dimensions | 340 × 56 × 232 mm |
| Weight | 6.47 kg |
| Country of manufacture | Italy |
FAQ
What type of car audio system is this amplifier designed for?
It is suitable for a system requiring four independently controlled channels. The channels can be assigned to front and rear speaker pairs. Bridged mode provides another way to use a pair of channels.
How should I choose the correct speaker impedance?
First decide whether the speakers will be connected in stereo or bridged mode. Then calculate the final load on each channel. Do not mix the impedance ratings specified for different operating modes.
How should I set the input sensitivity?
Match the 0.2-5 V RMS sensitivity range to the output voltage of the audio source. This setting is used to match signal levels and is not a volume control.
When should bridged mode be used?
Use it when a pair of channels needs to drive one load with a suitable impedance. According to the seller, this model supports a 2-ohm load in bridged mode.
Can the amplifier be configured with a computer?
A Steg Link connection is provided for this purpose. The correct cable and working software are required. The presence of the connection alone does not guarantee compatibility with a current operating system.
Where should it be installed in the vehicle?
Choose a rigid mounting surface with adequate air circulation. Allow enough room for the 340 mm-long enclosure and the connected cables. The installation location must not be damp.
Is it suitable for a home stereo or home cinema system?
No. This is a car amplifier intended for an 11-14.4 V power system. It must not be connected directly to a household mains supply.
When is password protection for the settings useful?
It helps preserve tuned user and installation data. This is particularly useful when several people may have access to the system controls.
