Audio Tuning

Why is tuning so important?

Here at CEN Automotive we thrive at being able to give our clients the most accurate sound reproduction possible. Audio Tuning is a vital part of installation and is key to get the maximum sound quality out of your new products and equipment. 

When building a sound system in a vehicle to get the very best out of it you will require DSP (Digital Sound Processor) this allows you to Tune the equipment once installed and is crucial to reach new heights of listening pleasure.

We as a company over the years have invested a huge amount of time and money to give our clients the best possible system set up. 

The most common piece of equipment we commonly use during system set up is the Audison Bit Tune.

You can find our range of Digital Sound Processors and Amplifiers.

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Audison Tune

What is Audison Bit Tune? 

Audison Bit Tune allows calibration for all Audison and Hertz products that have DSP. The idea of this equipment when developed was to speed up the setting of basic parameters for the calibration of the DSP (time alignment, equalisation and levels), ensuring an excellent level of acoustic performance.

The set up of a vehicle once all the equipment is installed tends to take around 3 hours.

Thanks to the new PERCEPT ENFORCE AUDIO function it is possible to model the total system response proposed by the bit Tune auto-eq as desired.

HSM - Hearing Simulation Mic

This is the most important component and is where the Audison research team focused most of its work, along with the acoustic analysis software. It is a disc-shaped microphone with 5 high-quality microphone capsules arranged around half of its circumference. 

The most important design element of the HSM was to simulate the “head” of the listener from the listening position, hence the name Hearing Simulation. The simulation of human sound perception is accurate, thanks to precise design choices: the overall diameter of the disc shape approximates the distance between the two human ears.

LPM - Level and Polarity Mic. This is a single-capsule microphone, used for setting system levels and for checking the acoustic phase of the speakers.

CMU - Central Measurement Unit. This is the “brains” of the system, acting as an interface between the acquired/generated data and the PC based management software.

EMS - Electro-Magnetic Sniffer. Using the supplied probe and built-in speaker, this function allows you to identify areas of the car where electro-magnetic (radiated) noise is present, which can turn into unwanted noise present in the audio system (alternator noise, interferences of electronic control units, etc.). Once the “noisy” area is detected, it is possible to avoid noise by locating cables and/or devices away from the affected area. 


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Audison APM

What is Audison APM?

The development of Audison APM is the result of years of research and development into a complex topic, the evaluation of in-car sound quality. Many people in the industry have been talking about measuring acoustic performance without ever having achieved a tangible result up to now.

The bit Tune hardware platform implements APM functionalities providing the market as well as industry specialists with a complete tool, enabling two innovative types of analysis which objectively evaluate customized and OEM car audio systems.

Thanks to the capabilities of APM, sound quality evaluation is no longer influenced by the preferred music genre of the listener. The APM technology is able to replicate the auditory perception of humans and therefore to measure the system performance with a high level of precision.

APM measurements

The APM software is composed by two measurement tools: the FSA (Front Stage Analysis) and TMD (Total Music Distortion).

The asymmetric listening position affects the quality of in-car sound reproduction. Placing the front soundstage at the center of a car hi-fi system is the most critical and challenging element. For this reason, we have developed the FSA, a dedicated analysis tool for the automatic localization of the virtual sound image generated by a stereophonic configuration.

This technology has been made possible thanks to the dummy head, which allows the recreation of a HRTF (Head Related Transfer Function) and a new approach, based on binaural and monaural cue which was studied to simulate the human auditory perception of the sound image.

Thanks to the FSA, the front sound emission can be analysed as if your dashboard was the soundstage of a concert and this allows one to determine, with high level of accuracy, the centre stage on the two axis, providing the FSA score as result.

TMD (Total Music Distortion) is a tool that can measure the linear and non-linear distortions of the system’s frequency response using a real musical track unlike conventional methods of measurement.

This analysis can be performed at different sound pressure levels, which is very significant for the system’s performance identification when we push the system close to or over its distortion point, providing different TMD scores for different SPL categories.

All of the above tuning equipment has been used on our vast range of demonstration vehicles so if you really want to hear what can be achieved in your vehicle, contact us for a free consultation and vehicle demonstration today.