A logo for frislev with a speaker in a circle.

The technology behind
CONCENTUS ONE, TWO & SONIC

The speakers deliver relentless high sound quality.

The speakers in Concentus One, Two, and Sonic.

A close up of a black speaker on a black background.

FRONT - LEFT

Amplifier 100W
Electronic crossover filters and DSP.
1 x 8" Woofer, 1 x Tweeter.kant.

A close up of a black speaker on a white background.

FRONT - RIGHT

Amplifier 100W
Electronic crossover filters and DSP.
1 x 8" Woofer, 1 x Tweeter.

Connect your turntable


The amplifier allows you to enjoy the authentic sound of vinyl records. To connect a turntable, you'll need a RIAA preamp. The RIAA preamp acts as the link between your turntable and the amplifier. You connect the turntable to the RIAA preamp and then the RIAA preamp to the AUX input. This ensures that the weak signal from the turntable is properly amplified and delivers a rich and detailed sound experience.

With this setup, you can enjoy the music as the artist originally intended.

A record player is playing a green record

This is how we measure the sound.

When the robot performs measurements of 4000 points on the bookshelf over a period of two days, it suggests a thorough and comprehensive analysis of the bookshelf's condition and characteristics. These points could represent various parameters such as temperature, humidity, load, or other measurements of the bookshelf's physical or environmental states. This extensive data provides in-depth insight into the bookshelf's performance and enables precise adjustments to enhance its functionality.

Once the data is collected, the process moves to the speaker tuning phase. Tuning the speaker is a critical part of optimizing sound quality and the performance of the speaker system in the bookshelf. This tuning process can be broken down into two main stages:

Electronic Tuning: This step involves fine-tuning the electronic parameters of the speaker system. It may include adjusting equalizer settings, amplifier parameters, or other electronic components to achieve the desired sound quality and balance. This electronic tuning ensures that the speaker system delivers the optimal sound experience in alignment with the measured data from the robot’s observations of the bookshelf.

Listening Tuning: In addition to technical adjustments, the tuning process also involves a subjective evaluation of the sound quality through listening. Listening tuning involves experienced audio technicians or engineers who carefully listen to the speaker system and make adjustments based on their perception of the sound's clarity, balance, and spatial characteristics. This step ensures that the sound meets the desired requirements and creates a pleasing listening experience for the users.

Together, these two phases of the tuning process form a comprehensive approach to refining the sound quality and performance of the speaker system in the bookshelf. By combining both objective data from the robot's measurements and subjective evaluations from audio technicians, it ensures that the speaker system operates at its highest level and delivers an exceptional audio experience for users.

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