So today i received 2 of James' Tenores. His good pair is the best i've listened to so far. Here is a bass comparison between it and the rest of the pairs using a splitter, test tones and left/right db adjustments through my soundcard:
HZ --------- 40| 60| 80| 100| 120| 140| 160| 180| 200|
James' Bassy -4| +7| +3| +4| +3| +2| +1| +2| 00
My first pair +1| +4| +2| +1| +2| +1| 00| 00| 00
My 2nd pair -2| +3| +1| +2| +2| +1| 00| 00| 00
Despite the fact James' reference pair produces more bass from 40hz and below, it sounds the flattest by far. The difference between my two pairs seems small but it's audible, my 1st pair sounds bassier. The drums reproduction issue is present with every pair i've tested to a certain degree. FR aside, there are common factors like sub bass elevation and longish decay times. Echo before attack in the transients also seems longer than average.
I would conclude that the Tenore driver is simply not equal to the tuning, a faster driver would handle the sub bass elevation more gracefully. In retrospect, a gentle roll off from 120hz and bellow would have made the slowness of the driver a lot less noticeable.
As for QC, it's simply atrocious. No two pairs share the exact same cable length. Bass tuning is as inconsistent as it gets. Members get pairs with channel imbalance or pairs that stop working after a few days. Testing with tones also shows some mild channel imbalance in the lower frequencies of most of the pairs i've tried. I love the Tenore, i truly do, but now that i had the opportunity to test a larger sample, i feel it would be irresponsible to recommend it to anyone when there are so many issues and inconsistencies with it.
I discovered that the "warm" pair wasn't really warm, it just produces some kind of distortion in the lower regions that threw my measurements off. The distortion isn't the same in the left and the right driver so that's also what caused the strong impression of channel imbalance in the lower region. The rest of the pairs don't seem to have those issues and only exhibit 1-3 db variations between them, which is acceptable. Sorry for the false alarm .
Edited by SkiesOfAzel - 7/5/14 at 4:38am