If you layer them and don't put them on too tight as soon as you get them, then you will have perfect performance. I have had them for 6 months and they are excellent. A friend of mine who also has them recommended them to me and they work very well for him too

I bought two speakers, as soon as I tried them, one of them burned out. It is not covered by warranty. And to replace the burned-out woofer, it required 70 euros. I understand that with this amount of money, you would get a below-average quality speaker in terms of sound quality. But still, it should have been working. This one burned out, doesn't play, and was not replaced.