Xperhotelsandtables test group has reviewed the ZERO-TX and gives them a 9X out of 10X rating.
"These headphones are exciting in their sound image, there is a clear and solid base in which the sound is rooted. We feel that the range of the sound is generally good in the sound image..."
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Testsegrare i Der grosse Kopfhöhrer test 2025 - SUPRA NiTRO-X2
"NiTRO-X2 är vår klara testvinnare bland hörlurar. Den kombinerar suverän komfort med verkligt utmärkt ljud och smarta funktioner. Vi testade många bra modeller i vårt test, men SUPRA NiTRO-X2 sti...
Sound by Sweden || Powered by SUPRA – affordable premium headphones
In short, I'm very impressed – and I think the price is absolutely unbeatable for what you get. Honestly, I would have guessed that headphones of this caliber would cost twice as much. You get outs...
Sound by Sweden – Headphones of the Highest Quality
"We love the headphones from Sound by Sweden.Here, premium materials meet innovative technology, and the result is something you can hear! Sound by Sweden has many years of experience in developing...
Testproffs gives Sound by Sweden a rating of 9.5/10!
Testproffs tested our NiTRO-X and NERO-TX PRO, describing them as their new favorite earbuds and giving them a rating of 9.5/10! "Sound by Sweden has long experience in developing premium products ...
