To summarize (I will keep slightly tweaking the scores as I keep swapping around cups):
1 (4pt).Sub-bass quantity: Bamboo, Rosewood/PH, Zebra, Teak
2.(3pt)Sub-bass quality: Zebra/Teak, Rosewood/Bamboo, PH
3.(5pt)Upper-bass quantity: Bamboo, PH, Teak, Zebra, Rosewood
4.(4pt)Upper-bass quality: Zebra/Teak, Rosewood, PH, Bamboo
5.(3pt)Lower-mids quantity: PH, Rosewood/Zebra/Bamboo, Teak
6.(3pt)Lower-mids quality: Zebra/Teak, Rosewood, PH/Bamboo
7.(5pt)Upper-mids quantity: Zebra, Teak, Rosewood, Bamboo, PH
8.(5pt)Upper-mids quality: Zebra, Teak, Rosewood, Bamboo, PH
9.(5pt)Highs quantity: PH, Teak, Zebra, Rosewood, Bamboo
10.(5pt)Highs quality: Teak , Zebra, Rosewood, PH, Bamboo
11.(4pt)Timbre: Zebra, Teak, Rosewood, PH/Bamboo
12.(5pt)Soundstage: Teak, Bamboo, Zebra, Rosewood, PH
13.(3pt)Sound localization for gaming: Zebra, Bamboo/PH/Rosewood,Teak
14.(4pt)Layering: Zebra/Teak, Rosewood, Bamboo, PH
15.(4pt)Overall perceived detail: Zebra, Teak, Rosewood, PH/Bamboo
16.(3pt)Potential genre specific fun factor (due to colouration): Bamboo/PH, Rosewood, Teak/Zebra
Overall score
Teak: 49/65
Rosewood: 36/65
Purpleheart: 32/65
Zebra: 52/65
Bamboo: 34/65
Personal choice ranking:
#1 Zebra
#2 Teak
#3 Rosewood
#4 PH/Bamboo
*Update: Essentially it comes down to Zebra or Teak for jack of all trades detailed performance so far. Teak certainly has smoother/liquid mids as stated by Tyll Hertsens, I also find the highs slightly more detailed and smoother than the Zebra's. Teak's soundstage plays nicely with certain tracks though I find it's localization a tad bit off/unrealistic at times. What this last part means is that I am sometimes having a hard time telling how close or far a sound is due to a somewhat blurry image, maybe this is also partly has to do with the left/right nature of the Teak wood: Zebra sounds like the sound comes from the front, while as with the Teak this can be incossistent and can sound left/right. I am sure Teak's overall warmer character should be preferred by most though. I however, prefer the more analytical and dry character of the Zebra wood which taps slightly more into the upper midrange and allows certain textures to come forward and be exposed. Zebra wood also is a bit more neutral, especially sub-bass to it's mids. The highs are a tad bit less nuanced/detailed and not as smooth compared to the Teak's so they are more the tracking type (impact over detail). The Teak thus truely excells with it's higher frequencies, in fact I never heard such beautiful and detailed highs before in a headphone. Though concerning perfection, for my tastes, at times the highs of the Teak wood are a bit too forward into the mix. This is where the Zebra simply takes the lead for me, it's entire frequency response is so well balanced and integrated that it is for me, the jack of all trades and the master of bass. These above observations are all with the Sharp Roll-Off/no delay digital filter paired with the SMSL SP-200 AMP and Topping E-30. The digital filter mentioned above is supposedly provides the most neutral frequency response, a slow roll-off filter can make an analytical pair sound more organic due to sounds being able to linger longer in the headphone's chamber. In my own experience, the slow roll-off filter sacrifices some control in the bass and higher frequencies for a smoother listening experience. The Zebra cups are the only cups I enjoyed BOTH digital filters with, the other cups simply played better with the Sharp-Roll off filter.