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Car Hifi Technologies
The most common and traditional analog amplifier concept. This technology is still unbeatable when uncompromising sound quality is a must. Though Class AB amps generate more heat compared to digital amplifier concepts and therefore require larger heat sinks and higher supply currents they will be audiophile’s preferred choice.
Digital amplifier designs based on Class D technology offer significantly better efficiency compared to traditional Class AB amplifiers. Besides lower heat dissipation, Class D amplifiers require lower currents from the power supply which means less stress for the car’s battery / alternator system as well – ideal for use in modern vehicles, especially BEV's.
Thanks to continuous technological advancements, today’s high-quality Class D amplifiers also achieve top-level performance in key audio parameters such as distortion (THD), bandwidth, and damping factor – making them fully competitive with classic analog designs.
Thanks to continuous technological advancements, today’s high-quality Class D amplifiers also achieve top-level performance in key audio parameters such as distortion (THD), bandwidth, and damping factor – making them fully competitive with classic analog designs.
Audiotec Fischer´s proprietary Class GD concept takes the efficiency of conventional Class D amps to the next level. By varying the internal supply voltage in several steps depending on the amplifier’s input signals, idle losses are significantly reduced and overall efficiency is close to maximum at any time. So heat dissipation is almost negligible, thus allowing smallest heat sinks and most compact form factors.
The unique Class HD concept combines the advantages of a Class H technology with the principle of a class D amplifier. The result is an unsurpassed efficiency which easily outperforms any conventional Class D amplifier. By continuously varying the internal supply voltage depending on the amplifier’s amplitude of the input signals, idle losses are significantly reduced and overall efficiency is close to maximum at any time.
Compared to conventional Class D amps, this concept achieves an extended frequency response to more than 40 kHz in combination with reduced distortion thanks to an advanced integrated feedback design. Ultra HD Class D achieves outstanding, “Class AB-like” sound quality combined with the efficiency of a Class D amplifier.
Highlevel speaker inputs for connecting factory radios or aftermarket radios without lowlevel line outputs.
Optical, digital stereo signal output in SPDIF format for connecting devices with digital input.
Amplifier Classes
Outputs
Inputs
The label "Made in Germany" has always been more than just a designation of origin: it is also a guarantee for unique car hifi concepts and technologies of the very finest. The goal of every innovation is not only to make products sound better and more reliable, but at the same time to simplify the operation and installation.
RCA / Cinch inputs for connecting signal sources, e.g. radios with pre-amplifier signals.
Optical, digital stereo signal input in SPDIF format for connecting signal sources with a digital audio output.
Electrical, digital signal input in SPDIF format for connecting signal sources with a digital audio output.
The HELIX Extension Card slot (HEC slot) allows adding further interfaces, such as a Bluetooth® Audio Streaming module or a High Resolution Audio USB soundcard.
The MATCH Extension Card slot (MEC slot) allows adding further interfaces, such as a Bluetooth® Audio Streaming module or a High Resolution Audio USB soundcard.
The HELIX Digital Input Module (HDM) slot allows extending amplifiers (depending on the amplifier model) with one or two optical digital inputs in SPDIF format including SPDIF Direc t In function.
Smart highlevel input ADEP.3 – Our latest version of our “Advanced Diagnostics Error Protection” circuit which can even handle the requirements of the latest generation of OEM car radios.
For the first time the circuit is also controlled by our integrated CoProcessor which allows to further interact with the diagnostic systems of modern radios.
Therefore the ADEP.3 ensures the best compatibility to most of all OE radios without loading the speaker outputs during high volumes unnecessarily.
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Smart highlevel input ADEP.2 – The latest generation of OE car radios incorporates sophisticated possibilities of diagnosing the connected speakers. If a common amplifier or signal processor will be hooked up, failure messages and loss of specific features (e.g. fader function) quite often appear.
Additionally, new power stage concepts in some radios may cause asymmetrical output signals which lead to distortion in the AD converters.
The ADEP.2 circuit avoids all these problems without loading the speaker outputs of the OE radio during high volumes unnecessarily.
Smart highlevel input – The latest generation of OE car radios incorporates sophisticated possibilities of diagnosing the connected speakers. If a common amplifier will be installed, failure messages and loss of specific features (e.g. fader function) will be the result.
The ADEP circuit avoids all these problems without loading the speaker outputs of the OE radio during high volumes unnecessarily.
DSP Features
Supports a lossless audio reproduction of High Resolution audio content.
Advanced 32 Bit CoProcessor platform (ACO) for a bunch of new system and DSP features. For example the unique DSP sound effects (Augmented Bass Processing, StageXpander,
RealCenter etc.), the speed advantages in data communication or the opportunity of software upgrades of all components of the DSP.
Internal Audio-DSP that have been developed specifically for processing music signals and, thanks to their high resolution of 56 Bit, are much superior to conventional multimedia DSPs in terms of sound reproduction.
Audio DSP with 64 Bit resolution inside. Complex filter settings may require more than 32 Bit word length in order to reliably avoid quantization distortion and noise. That’s why our DSP’s perform all calculations with the enormous resolution of 64 Bit, means acoustical artifacts will have no chance at all.
Two full 64 Bit DSP chipsets are used in this product to guarantee superior tuning capabilities. Doubling the processing power allows the implementation of a wide range input and output channels. The additional processing power ensures that also features like our “Virtual Channel Processing (VCP)” and “DSP Sound Effects (SFX)” are implemented as well.
The Input Signal Analyzer allows to measure the audio signal which comes from the car radio and to compensate this if necessary. By doing so it is possible to de-equalize any ex-factory sound settings which makes further manual adjustments of the DSP easier.
In opposite to previous methods the Virtual Channel Processing (VCP) is a multi-stage signal processing concept that enables the perfect configuration of complex sound systems, opening up completely new possibilities for sound tuning.
The function extends the previous scope of the device by an additional layer of processed channels, which is located between the inputs and outputs.
These channels behave like normal DSP output channels with EQ, Time and Phase adjustment. This ensures a much more flexible system design in complex car stereo systems as well as gives you the option to utilize functions like a GroupEQ, Rear Volume Attenuation and the flexible routing of the SFX functions.
The function extends the previous scope of the device by an additional layer of processed channels, which is located between the inputs and outputs.
These channels behave like normal DSP output channels with EQ, Time and Phase adjustment. This ensures a much more flexible system design in complex car stereo systems as well as gives you the option to utilize functions like a GroupEQ, Rear Volume Attenuation and the flexible routing of the SFX functions.
1 to 1 channel routing option – As soon as a vehicle is already equipped with a premium sound system ex works, whose amplifier often already has more than 6 channels, e.g. Burmester or Bang & Olufsen, in many cases, a replacement is no longer possible. Only an amplifier with the same number of highlevel inputs can be considered for upgrading such a system. Therefore all Audiotec Fischer amplifiers with 1 to 1 channel routing option provide at least a minimum of 8 highlevel inputs and just as many amplifier channels.
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This device supports Audiotec Fischers unique DSP sound algorithms like the “Augmented Bass Processing”, “StageXpander”, “RealCenter” etc.
Hardware Technologies
The TwinPower Link allows to run two amplifiers of the same model in series which more than doubles the output power (depending on the speaker configuration).
The Regulated power supply assures a 100 % stable internal supply voltage independent of the battery voltage and output load which provides stable output power under all conceivable operating conditions.
The SMD manufacturing technology (Surface Mounted Device) combines minimum space requirement with maximum reliability.
Very compact design for smooth integration into the vehicle.
The device provides an integrated, active crossover with various filter configuration options.
The Auto Remote switch allows to activate or deactivate the amplifier´s / signal processor´s automatic turn-on feature via the highlevel input.
Additional Features
The device allows easy installation into existing factory sound systems via optionally available Plug & Play cable harnesses.
The device is compatible with a MATCH Plug & Play subwoofer.
Individual DSP configuration with the professional and very user-friendly Audiotec Fischer DSP PC-Tool software.
The DSP PC-Tool software with its numerous adjustment options allows an extremely precise sound tuning even under most demanding acoustical conditions. Read more
Vehicle-specific sound setups are available in our sound setup database for the configuration of the internal DSP. These are optimized for the perfect sound experience in the respective vehicle.
This device is designed for use in cars with start / stop feature. Even during short voltage drops down to 6 Volts (e.g. while engine start) the functionality of the device remains stable and unaffected.
The Power Save Mode allows to significantly reduce the power consumption of the amplifier and / or signal processor in modern OEM integration installations. The integrated and / or connected amplifiers will be shut off when no music signal is detected for a specific time.
The connection of an optionally available remote control is possible which allows to adjust several features of the device e.g. the subwoofer volume.
Quality Made in Germany. All products with the “Made in Germany” button are developed, manufactured and tested at our headquarters in Schmallenberg, Germany.
Remote control is included in delivery.
The input equalizer is the kindred partner of the input signal analyzer (ISA). There are five bands available for each input channel, which can be freely defined as fully parametric equalizers, all-passes or shelving filters. This means that the signals from all factory radios can be linearized effortlessly. Even better – if there are already any time delay differences between the individual channels of the signal source, the input equalizer can also compensate for these, which e.g. is important if you want to sum several input signals for the subwoofer.
The correct setting of the time delay between the individual speakers in the vehicle is essential for a perfect stage image. The conventional method of manually measuring the speaker distances to the ear often provides imprecise results, especially with passive 2-way or 3-way systems, as it is impossible to predict which of the speakers should be used as the reference for the "mechanical" measurement. Automatic Time Measurement (ATM) solves these problems in an elegant way. With the help of a measuring microphone (e.g. our MTK1) and a special measuring signal, it precisely determines the correct time delay for each individual channel.
Multi-functional connector for accessory products like a remote control which allows to adjust several features of the DSP / DSP amplifier.
Depending on the connected product, its power supply is also provided via the Smart Control Port.
Depending on the connected product, its power supply is also provided via the Smart Control Port.
The amplifier allows to change its operation mode from 1-channel mono mode to 2-channel stereo mode by removing a jumper inside the device.
The DSP circuit board of the product is developed and manufactured in Germany. This ensures first-class quality and maximum sound performance, just as you would expect from an Audiotec Fischer product.
The DirectDSP function allows to bypass the amplifier's internal crossover and route the input signal unfiltered to the output stage of the amplifier.
The device is equipped with a Clipping LED which enables a fast and easy gain adjustment.
SOP Max – maximum power, regardless of supply voltage
SOP Max is a high-performance power supply technology that guarantees consistently high amplifier output – even under severe voltage fluctuations in the vehicle. Unlike conventional amplifiers, the output power remains completely stable, even during engine start or under extreme load. The result: full power at all times and maximum operational reliability, even in complex or powerful audio setups.
Stabilized Output Power (SOP) – consistently powerful performance
Our SOP technology ensures a stable output power even when the vehicle’s supply voltage fluctuates – such as during engine start-up or under heavy system load. Thanks to an intelligent voltage management in the power supply, the amplifier's performance remains consistent, delivering dynamic and precise sound at all times. Especially ideal for vehicles with dynamic alternator regulation and unstable voltage conditions.
The amplifier outputs of this device are bridgeable – meaning two channels can be combined into one more powerful channel. This allows, for example, a single subwoofer to be driven with significantly more power. This flexibility opens up additional options for system configuration and enables targeted power bundling – all without compromising sound quality.
The device is designed for operation in 24 Volts electrical systems.
Designed for use in electric vehicles. The extended input voltage range up to 18 V enables stable operation even with increased on-board voltages in modern vehicles.
The Advanced Input Signal Analyzer is a powerful measurement tool in our DSP PC-Tool software for fast and precise analysis of incoming audio signals. AISA can be used with a professional external audio interface such as the Audiotec Fischer AMI, or with devices featuring USB PerfectStream. It measures the frequency response of the input signal and reveals factory-applied audio processing such as EQ settings, high- or lowpass filters, and allpass filters. These measurement results provide a reliable basis for evaluating the input signal and optimally adjusting it with InputEQ, Time Alignment and DLC for further signal processing.
When every detail matters, conversion has to be reference-grade. That’s why this product features premium A/D and D/A converters from ESS Technology with HyperStream® IV architecture and SABRE HiFi® technology – widely regarded as a gold standard in high-end DAC and ADC design. The result is precise conversion with high dynamic range and extremely low distortion for maximum clarity, fine detail, and a natural sound signature.