What makes our technology special

We look at the interior of a vehicle from an acoustic perspective. In order to design our audio technology for the special acoustic conditions, we have examined, driven, measured and, above all, LISTENED to countless construction and agricultural machines, forestry machines, mining vehicles, passenger cars, aircraft interiors, etc. We know what hardware and software must be able to do in order for music, radio and radio to work in very good quality.

We have not only listened to the vehicles, but also to the drivers to understand why the current technology is not satisfactory. We understood that many drivers need high-quality hands-free communication because the driver’s seat is also the office. We have understood that communication with colleagues is essential. We understand that the shortage of skilled workers is immense and that good drivers place a high value on comfort in the workplace.

To make the audio experience of the future a reality, you need speakers, microphones, a hardware platform, sensors and much more. Almost all components have been developed by us. We know exactly what the hardware needs to be able to do in order to meet the environmental conditions in vehicles and at the same time create a unique audio experience.

Audio software is our hobby. All algorithms are home-made and can be customised. We have the greatest expertise in ANC algorithms. This is where we set new standards.


Technical data

  • Storage temperature min:
    Condensation protection:
    Use in earthquake areas:
    Interference emissions 75 – 400MHz, BB:
    Approval according to:
    Vibration resistance according to DIN EN 60068-2-64/-27 – Random vibration:
    Current injection test (BCI) according to ISO 11452-4:2011:
    Interference emissions 30 – 75 MHz, BB:
    Cleanliness according to clean room cleanliness class:
    Distance of headrest rods (centre to centre) min:
    Vibration resistance according to DIN EN 60068-2-64/-27 – Shock vibration:
    Interference resistance test against ESD according to ISO 10605:2008:
    Operating voltage max:
    Operating temperature min:
    Test pulses on supply power according to ISO 16750-2:2012 – Start pulse:
    Interference emissions 400 – 1000 MHz, BB:
    Reverse polarity protection:
    Storage temperature max:
    Test pulses on supply powers according to ISO 7637-2:2011, ISO 7637-3:2007:
    Operating temperature max:
    Short-circuit resistance:
    Supply cable connection:
    Relative humidity max:
    Distance of headrest rods (centre to centre) max.:
    Protection class Enclosure:
    Test pulses on supply power according to ISO 16750-2:2012 Load dump pulse:
    Power consumption:
    Diameter of headrest rods max.:
    Operating voltage min:
    Headrest width max:
    Range of use Frequency band:
    Application range Sound level:
    Overtemperature cut-off:
    Headrest rod diameter min:


  • -55°C
    54 – 65 dB (µV/m)
    EMC Directive 2014/30/EU, EN ISO 13766-1:2018, EN ISO 14982:2009
    up to 2.97 g
    Class A
    64 – 54 dB (µV/m)
    112 mm
    up to 25 g
    Class A
    24 V DC
    -40 °C
    Class A
    65 dB (µV/m)
    105 °C
    1: Class C, 2a: Class A, 2b: Class C, 3a: Class A, 3b: Class A, a + b: Class A
    70 °C
    560 x 250 x 230 mm
    German DT06-6S-CE 13, 6-pole
    193.5 mm
    Class C
    120 W
    14 mm
    8 V DC
    30 cm
    3.5 kg
    50 to 500 Hz
    1x A2B, 1x CAN bus, 1x Ethernet, 1x RS232, 1x USB
    up to 100 dB(A)
    from 75 °C with 10 °C hysteresis
    10 mm


+ User-centric entertainment zone
+ Heavy Machinery special speakers
+ Designed for real-world environments
+ Optimal connectivity
+ Maximum comfort: no wearable necessary
+ Adaptive volume control


+ Maximum range via Bluetooth
+ Multiple microphones
+ Designed for real environmental conditions
+ No battery-related downtime
+ Maximum comfort: No wearable necessary
+ Highest safety: "Hands-Free"


+ User-centred CB radio zone
+ Long range
+ Replaceable antenna
+ No registration, no usage costs
+ Maximum comfort: no handset required
+ Adaptive volume control


+ Robust reception without noise
+ No need to scan stations
+ Designed for real-world environments
+ Easy operation via app
+ More stations
+ Digital sound for a better sound experience

FAQ - Technology

You have a question? We are here to answer it! If your question is not answered, please send us an email via our contact form.

ANC stands for Active Noise Cancelling. Sometimes Active Noise Control is also used as a synonym.

ANCOR means Active Noise Cancelling Offered by Recalm. We have named our first product ANCOR.

RNC stands for Road Noise Cancelling or Road Noise Control. This primarily reduces tyre rolling noise for the driver’s ear.

First, microphones pick up sound waves from a primary noise source, e.g. loud engine noises. With the help of the developed ANC software, signals with opposite polarity to this source are then generated. These are output as counter-sound by our ANC system, which is attached to the headrest. These anti-noise signals neutralise disturbing sounds for the human hearing by means of “destructive interference”. This means that both sound waves cancel each other out and a wave with a significantly smaller residual amplitude (residuum) is created.

ANC is particularly effective in the low-frequency range. Our technology achieves a reduction between 50 Hz and 500 Hz. If tonal components are included in the noise, ANC works even better.