"I've been using their sound effect since many years now and all i can say is it's quality works, this brand is in constant research and development in order to provide the best equipment for sound system, used and approved by Blackboard Jungle sound system"

"Yes this is mark from iration steppas !yes we use Klementz efx box & this is one of the new generations of Electronics builders & we recommend this french men as good new technicians for our soundsystem future for all .👍"

"I have a 4-band stereo parametric filter with gain/freq/Q per band developped and built by Klem. Nothing to say about the audio qualities of the product. It's perfect to seek the frequencies and add the sound system touch to our new setup without denaturing the music"