I completely agree that the cab plays a major role in the performance of the speaker. I have some small experience in designing and building speaker enclosures for multi-driver full range audio, and am fairly comfortable with how the various types of enclosures can affect the power handling and frequency response.
Based on the responses to this thread, and others pursuing a similar goal (that of great sound from a Ceriatone OTS through a 1x12), I plan to build my own cab to best suit that goal. So far the clips of the EVM-12L through the Hermidia ported cab are in first place IMHO.
I have found the exterior dimensions for that cab, and can get very close on the diam. of the ports from the images. I may have to play a bit with the length of the port tubes, but that is not hard to do.
My largest concern centered on the power handling of the EVM-12L (200W) and if that would negatively effect its quality at lower volumes. In many high-fi audio drivers high power handing is achieved with very stiff cones and surrounds, resulting in poor low volume performance and the side effect of lowering speaker efficiency. Although I have not been able to find a db SPL rating for the EVM, based on the very large magnet and cast aluminum basket, it appears these are the way EV has gone to maintain high efficiency and power handling at the same time. If that is the case, the driver "should" still sound good at lower levels...
Since I still have 9 weeks left until my OTS is delivered, the search continues!

JT

Marin,
Since I plan to build my own 1x12 for whatever speaker this search results in, I have been reading a variety of web articles. While this one is a bit basic for my needs, I did find it a chuckle.

http://www.colomar.com/Shavano/speaker_design.html

JT

I want to second Marin's comments here. I love these clips of a EVM12-L in a 1x12 (different D-clone though), but wonder if such a high wattage capable speaker will sound this good at low volumes too...

http://www.soundclick.com/bands/default.cfm?bandID=120568&content=songinfo&songID=6458429 -Clean tone
http://www.soundclick.com/bands/default.cfm?bandID=120568&content=songinfo&songID=6458866 -Blues tone

Thoughts?
JT

AS an added note, I have heard that the Celestion G12-65 works really well with this amp so I went shopping for one. Seems Celestion has done a reissue of this model calling it the Heritage and I'm wondering if anyone here has experience with it, or can compare to the original G12-65.

Thanks,
JT

After some small communications with Nik, placed my order for Overtone special today. As I have built furniture, gun stocks, and other items for many years, I ordered the unit without cab, and will build my own.
Thought I would share one item that may be of interest to those modding the Overtones.
Nik's response to a question relating to "most current design" was, "We did change a resistor and pot value for smoother overdrive".
Suspect this is the OD level pot to 100K and pre OD resistor from 150K to 220K change that has had some discussion on this board.

Now for the next 9 weeks...
JT