THX Certified | Arendal Sound


Each speaker must pass a set of 400 measurements

All our 1723 speakers are Certified by the very strict testing protocols of THX Ultra where each speaker must pass a set of 400 measurements. The THX Certification does not mean it is a dedicated home speaker, but rather a guarantee of tight consistency within well-established acoustic parameters. THX Certification is as much about music, as for movies.

The engineers at THX Labs utilize a proprietary scientific testing methodology to ensure the
highest audio fidelity possible. All 1723 speakers passed the THX Ultra Certification without any change to the products, meaning our standards already exceed THX Ultra level out of the box!

Key tests in this program are as follows:

  • Axial frequency response
    This describes a loudspeaker’s ability to reproduce audio accurately. The test confirms if the axial frequency response is balanced and flat within tight tolerances.
  • Vertical and horizontal dispersion
    Not everyone gets the middle seat when watching a movie. THX measures the off-axis response to confirm if it is smooth with no audible comb filtering. A pass at THX Ultra ensures every seat in the room is served just like the sweet spot.
  • Output versus distortion
    This tests the speaker’s ability to reach the SPLs necessary to achieve the THX Reference Level within certified limits of distortion at the listening distances required by THX Ultra.


It might be the right time to alert your neighbours.