Single driver full range speakers

@total111

Assume your Rethms were the old cylindrical ones?  Never heard them, but newer ones, which are only ones I’ve heard, are supposed to be much better.  

So I took some time and looked up the thieves small parameters for your driver.

https://www.parts-express.com/Tang-Band-W8-1808-8-Neodymium-Full-Range-Driver-264-894?quantity=1

Based on those values the efficiency bandwidth product comes our to

 69.696969697 http://www.calculatoredge.com/new/bandwidth.htm

So that pretty much freedom of choice between a sealed or ported enclosure. There are a lot of tricks to come up with the Qts and -3db point you're looking (hoping) for. I didn't see your design specs so if this helps, good for you. If it isn't helpful, my apologies and best wishes best wishes!

My neighbour runs wide-bands over Ripol subs. Originally he had the same Tang-Bands. They are very nice! Good choice. He moved on to Lii Songs. And then, as in this picture to Lowthers. Now he has EMSpeaker electromagnets. I always loved the Tang Bands myself though.

PS: seems no pictures allowed here that are not url-based. Anyway, can provide more info somehow separately if wanted.

A Transmission Line design for the Cabinet will produce a improved structure to the Bass presence. 

A TL is also able to substantially reduce residual Bass energy where the Bass generated is more ESLSpeaker than Cabinet Speaker. 

Has your Speaker design been measured to see where it is rolled off. 

Bass may be present as needed but without the Colouration that some individuals need to experience.