Certain speakers are more prone to tonal changes during break-in, and the Creambacks certainly fall in that category. Buy a pair (or quad) of the 65s or 75s brand new out of the box and many find themselves ditching them before they are properly broken in for all the tonal descriptions in this thread: flat, thin, boxy, etc. Plug into a cab of well broken-in Creambacks and that’s how Celestion continues to tell Creambacks. Once broken in, the 75 is definitely the smoother, more modern sounding of the two, where the 65 definitely has more of the vintage vibe and bigger midrange going on. I have found that a well broken in 75 offers quite a bit of what people who like VIntage 30s like about Vintage 30s - they seem to share quite a bit of the same sonic real estate - smoother overdrive, more scooped mids, more top end, more ‘modern’ sounding. While mixing the 75 with the V30 can sound good - I personally heard a bigger difference and a bigger ‘compliment’ when pairing the 65 with the V30. Where a pair of 65s can be a bit mid / low mid heavy and a bit raspy on top, the V30 adds some smoothness, doesn’t fight for the same sonic mid-range territory, and adds some sparkle that many find the 65 lacks. I have a 65/V30 pair in a ported 2x12 and dam that cab sounds nice with any amp in my collection.