sound stage, imaging in 2 seater

The Lotus are a nice driver as well.  In fact, I believe Dyohn runs them in his car stereo.  They has one or two advantages over the Extremis, but in my admitidly biased but still honest opinion, the Extremis has many more advantages.

IIRC the AV5's are no longer available.  However a quick e-mail to Adire should clear that up.  But then, I would recommend simplifying the process and just run the Extremis up to the tweeters.  They have a nice response all the way up to 5 kHz without much issue.

Here's a good tweeter: http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-735  And here's it spec sheet: http://www.partsexpress.com/pdf/264-716s.pdf  It has very good extention on both ends as you can see by it's response.  I like that their measurements are at 94 dB.  Also if you notice on the waterfall plot, there aren't any bad stored energy ridges. 

Doh, my bad.  I should have looked up your model number.  Unfortunately I can't find any measurements on those speakers. 

The Extremis is a wide band driver capable of delivering great midrange performance.  You really don't need to add a seperate midrange to the equation as this will make things more complex with crossover design. 

That does bring up the next question; what are you going to do about the crossover?  Keep in mind that the crossover is THE most important part of any speaker system and will determine how good your final results are.

1) Thanks!  I don't recommend that to people as there was a lot of work involved.  Hopefully some day I will finally finish it though.

2)  Well then you are going to have to ask yourself how much difficulty you are ready to face.  Read the different levels of speaker designs I list in that above sticky and decide which one you want to take on.  However if they all look too difficult for you, then I would suggest a  pre-available speaker set from one of the many manufacturers.