I run a CX210/CX115 with the Legacy 800. Until today, I have not had any issues with either cabinet but I noticed when up around the 7th fret on the lower strings it sounds as though the speaker is blown making the "farting" noise. With this in mind, I am having second thoughts on moving forward with the CX410 or the RBH410 or if I should just sell the CX series and move on to something else. I am not 100% sure what caused the issue, I am a moderate player with no real need to BOOM. Any feedback is welcomed.
So this is something that suddenly started happening? Try playing through one cabinet at a time to see if one or both are causing the bad sound. If you're playing an active bass, replace its battery. A low battery can do odd things to your sound. Try playing a different bass through your rig.