Thanks for post - good info, even though I have a 50-watt OTS and not HRM version. I've only used a 1x12 cab with EVM12L Classic until recently purchased a Two Rock Sig Cab 1x12 with their 1265B.  Two Rock Sig Cab is very nice, 1265B seems to provide more mid range then the EVM12L, but does other things better, just not the cleans I get with EVM12L.  I just started messing around with using both cabs together and have found some nice compliments to each other.

My typo...long holiday season - I have the R, I felt sounded better with my 50-watt OTS, but have played through all TR speakers.

I like the B and the R speakers the best  - personally I like the EVM12L better than 1265 if that is a fair comparision - for a good clean speaker that is hard to break up?

The NEW 12-65B is the answer to those wishing the R speaker could handle more power- here it is! The 12-65B  has a warm and bright top end and great low mids and bass.The 12-65B is available in 8 or 16 ohms and is conservatively rated at 100 watts. Our New Favorite! Suitable for use with any Two-Rock amp, in 1- or 2-12 configuration. Higher powered Two-Rockers might try a 12-65 /65B combination in our Signature 2-12. It's the perfect balance and is standard equipment for the first time in our 10th Anniversary Package!

The 12-65R was developed for those Two-Rock enthusiasts desiring a livelier, brighter, lower power handling speaker. The R features a lighter, brighter cone, and offers more coloration when pushed.The 12-65R is available in 8 or 16 ohms and is conservatively rated at 75 watts. Suitable for use with any Two-Rock 50 watt amp(alone), with the Jet and Jet Signature,  or in  2-12 configuration. A popular option is the 12-65/65R combination in our Signature 2-12- the best of both worlds in one cab!

Arguably the best speaker for D style amps is FANE AXA 12 alnico.
100W, 101db. Sweet highs, awesome lows and mids.
But you have to give them at least 40 watt to open.

Here is the clip with FANE

Fane is still making speakers I believe, they make a host of high efficiency speakers,drivers,tweeters etc. I could only imagine that an old Cresendo would sound great with a d-style amp. Fane was like the Ev of Europe in the late sixties. I once read a review that was done,talking about testing all sorts of speakers with a d-clone. Fane tested the highest on the list for efficiency,Max Decibles,frequency handling and full range capabilities that also included an EvM-12-L,SRO, a Jenson Neo and tornado,JBL's and all sorts of celestion's and Webers too.