Ho ritrovato il link: https://line6.com/support/topic/32964-hx-effects-audio-artifacts/
Hello, all. It’s extremely rare (roughly 0.5%, or 1 out of every 200 HX Effects units sold), but certain specific combinations of HX Effects units populated with out-of-spec parts and amplifiers and/or hookup configurations can manifest notable white noise and/or other unsavory audio artifacts. If your particular setup happens to exhibit this behavior, please contact Line 6 customer support, as we currently have a solution. We have also updated our manufacturing and testing process to ensure no future units exhibit this behavior, regardless of configuration.
If you’ve already logged a ticket, sit tight—someone will be contacting you.
And if you’re one of the lucky 99.5%, continue playing as normal. Or depending on your chops, maybe better than normal.
We apologize for any inconvenience this issue may have caused.
Line 6 Customer Support
Ho seguito la faccenda perché avevo acquistato una delle primissime HX Effects arrivate in Italia. Sembrerebbe che avevano dei componenti errati.
I Clienti lamentavano proprio problemi di rumore in 4CM.
Qui c'è la risposta ufficiale di Frank Ritchotte
https://www.thegearpage.net/board/index.php?threads/new-line-6-hx-effects-multieffect.1904280/page-122
Ok guys on the hiss issue:
It’s extremely rare (roughly 0.5%, or 1 out of every 200 HX Effects units sold), but certain specific combinations of HX Effects units populated with out-of-spec parts and amplifiers and/or hookup configurations can manifest notable white noise and/or other unsavory audio artifacts. If your particular setup happens to exhibit this behavior, please contact Line 6 customer support, as we currently have a solution. We have also updated our manufacturing and testing process to ensure no future units exhibit this behavior, regardless of configuration.
If you’ve already logged a ticket, sit tight—someone will be contacting you.
And if you’re one of the lucky 99.5%, continue playing as normal. Or depending on your chops, maybe better than normal.
We apologize for any inconvenience this issue may have caused. The guys will let you know how sorry we/I am and we will make it right for you. Thank you for your patience. I know it seemed like we took a long time and that’s because we did. We wanted to make sure we replicated all the configs and were able to isolate the issue.
Spero di esserti stato d'aiuto.