Define better bass quality. The only reason why those same people say the newer 407 or 507 have better bass quality are comparing to LCD's or HD800's most of the time, comparison between it and the older line are only done by a handful bunch of people here such nerdling, Stax mafia and non active low count posters. Buy 404LE/507 (they use the same leather pads) put it any Lambda model and you will instantly have more bass.
As I said before, the old vintage Lambda models are more, balanced, neutral and realistic sounding then the modern Lambda garbage Stax has been producing since the last good Lambda and that was the LNS. The x02 series ain't half bad but Stax went back to the same old with the 207-507 with bumpung up the brightness to give users to perceive more detail retrieval.
I said it right in that quote - our fearless leader cited the 507 having cleaner bass response than other Lambdas. Whether this is a function of pads is beyond my guess, but members of the mafia also compared the 507 favorably against the 404LE (in fact someone may have preferred it). These are not from the typical headphone user but rather from experienced Stax ears.
In the investigation (not on this forum), Stax mafia also concluded that the 507 was as good a Lambda choice as any. With a pad swap the 407 shouldn't be any different and even the 307 might be more of the same.
In any case another member's allegation that most Stax veterans prefer the older series is untrue if we are all referring to the Stax mafia. Your impressions seem to be the odd one out here..
Yes the X07 series is a bit bright, but they don't exhibit the upper midrange etch present on most older Lambdas. Another issue with the X07 is the construction, as they are far heavier (denser plastic) and not as comfortable.
Edited by 3X0 - 2/21/14 at 7:31am