Thanks for the reply. My understanding is that year & month is stamped on each of these. For me, matching months would be enough (likely to be same manufacturing batch). I know more advanced "matching" is possible. As there's nothing at all mentioned on this website, I can't buy with any...

Were the valves paired/matching dates? Always stopped myself from ordering there because it doesn't state one way or the other what happens if you order 2+. Thanks.

Agreed, you are not going to 'feel' the bass on these.   Bass and volume are different things. The slider won't impact on the bass, just the volume (and since it's super sensitive, maybe the left/right channel separation).

Quote: If my replacements did not have the same issue, I would have said it was a one off and not had a problem (these things happen). But poor service, where I had to chase them to send me the replacement, and then having the replacement with the exact same issue is what has raised major...

Quote:   Hmmm, ask me in about a month. Should have a better idea by then.   Quote: What the E1 is not good enough? lol.

Quote:   Ensure you check for cosmetic defects if buying from this seller. I got two black versions (5905BK) that had obvious surface issues with the band that goes across the top arch. I would consider them factory seconds because of it. On top of this, sloppy service and needing to...

I thought I should finally join after dropping into the forum for years.   Current equipment is as stated:   Sennheiser HD-600s, bought about 13 years ago. Finally getting new foams for them, as the old ones deteriorated whilst in storage for a few years.   Sennheiser CX-400 IIs, my...