Jazzyvee.
Thanks's for the input. You bring up some excellent points.
I have been able to indirectly compare two non-alembic basses owned by a friend of mine one of which has ebony lams in the neck and the other of which does not. They were both thru-neck, custom basses made of similar woods, however, they were from different manufacturers.
Being a researcher by profession, I first played them with and without amplification and thought I heard and felt a difference (I emphasize the word thought since I was expecting a difference and the mind often perceives what it expects to perceive). Interestingly, the difference was more noticeable (to me at least) in the non-amplified mode.
I then had my friend play both instruments out of my sight both in amplified and non-amplified mode. The difference, if there was one, appeared very subtle.
So overall, my personal experience was that there was a subtle difference (I think). It appeared much more noticeable: (a) in non-amplified mode and (b) when I was actually playing the bass (i.e. holding it).
It was obviously a far less than perfect comparison as there were a number of confounding factors which I was unable to control (including the fact that the bass with the ebony lams had 3-ebony lams as opposed to the one that I am getting). By the way, my friend is 6'6 tall and weights about 240 lbs. The only way I could have ever played that bass for more than 5-minutes was in a sitting position.
In the end, I decided to go with the ebony laminates on the basis on what Mica had told me more than anything else. In my dealing with her and others at Alembic I have found that, if anything, they are incredibly honest.
By he way I did decide to go with the Crotch walnut front and back and the continuous wood backplates. Made the decision more on the basis on not wanting to regret leaving anything out since this will probably be the bass that sits next to my coffin when I eventually go to the never ending jam in the sky.