A full range speaker?

Now think concentric driver with a whizzer for better off axis and phase plug for back wave distortion reduction.

My question is can you still keep the acoustic center of the two drivers and use the correct phase plug to stop the back wave (BASS), from the rear/side walls first reflection.

Hypothetically the HF driver would have to be set inside the phase plug or Open Baffle the HF driver backwards.. (I’ve seen that).. and it works if the rest of the driver system is in a box, bipoled the opposite direction.
(I haven’t seen that)


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Wayyy over my head, 
btw what is 
~~~HF~~~

I really have no idea what you are descriving.
Anyway. My DavidLouis 6.5 whizzer wide band just arrived , Up N running. 
Very nice gain over the DL4 incher wide band.
Added some bass, , mids are claener, highs not rolled off. = A WINNER.
$450 includes ship
 The Crescendo/Seas wasa HUGEEEE disappointment, Seas claims 92db, My tech hook it to his sens gadget,, maybe 85db, when i hooked it up to a  Mundorf 2.2 Supreme cap,,I COULD HARDLY HEAR IT ,, I;d say its more like 83db,,which means I have to ship it off to madisound for testing,, No way seas would lie.. We will find  out if something is wrong,,Bought it as new off ebay auction,

Anyway,,I'd say this DL 6.5 is the very best wide band in production
versus\
Fesatrex, 
AER
Voxativ.
Yep, thats my 2 cent opinion, The DL  at $450, needing NO HORN cabinet, just a  12 inch x 12 inch x 12 inch sanded ply from Home Depot, cut in 4 1 inch port hole at each corner = and you have a  $20 cabinet.
I just feel the big 3 labs will not hold up against the DL 6.5.
No have not heard the big 3 , all models,, only the Vox AC1A, 
The DL completely totally annihilates and destroys the Voxatiiv AC1A 's @ $2k.
Davidlouis Gold Standard in Wide band.
I'd take this DL6.5 over any Wislon and Vandersteen 

Enjoy

Some tech geek in china, knows how to build a  wide band. 

https://www.youtube.com/watch?v=-h8TRoILZEg

Concentric is two drivers in one chassis with the center being the High Frequency (HF) driver independent of the outer Lower Frequency (LF) driver. Tannoy speaker drivers.

Read what it says over a few times and it will make sense.. We want it, in your head, not over your head. :-)

Regards

Read what it says over a few times and it will make sense.. We want it, in your head, not over your head. :-)

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Yes I looked over the Tannoy's. Interesting,, Seas also has a  ~~Co-axil__.
Interesting if you read the descript, Seas says they designed this ~~concentric~~  with the highest regards for super high fidelity.
Again, interesting. 
But note, Seas says  bass is 150hz, more as a  midrange-tweet.

https://www.madisoundspeakerstore.com/coaxial/seas-excel-c18en002/a-e0060-6.5-coaxial-each/
I am sure the Seas along with a  Seas W22 Graphene would be a  nice speaker, caveat $$$$$$$$./
So I went with the 
DavidLouis wide band @ 91 ~~TRUE!!!~ sens and bass does in fact hit the 60hz, if not 50hz before roll off. 
Mids/vocals are accurate and nothing harsh nor  showing signs of stress at moderate db levels on gain.
Highs are there, rolling off, maybe like 13k/14kish. 
= highs are sweet and satisfactory.
So for $450 its right in my budget, vs the layout for the Tannoys  which I may have some issues with either in the bass/, mids or highs.
I have no issues whatsoever in the DL 6.5
This lil DL 6.5 is the speaker to beat out ina  shootout  IMHO/2 cents worth.

Here's another demo of the DL6.5 in action,.
Its everything i hoped for in a  speaker. My experiements , though costly, have paid off.

 The DavidLouis has no other YT  uploads except on my channel. I will be making a  long series of vids over the next weeks showing just what this speaker is capable.



https://www.youtube.com/watch?v=-h8TRoILZEg&t=2s

Dis the above DL video, This is DL part 2. I am telling you, this lil wide band delivers rich detailed  nass/mids/highs. 
I would not trade this DL6.5 for any speaker on the market.
Not even the Wilson top line.

https://www.youtube.com/watch?v=23SlH6meAQA

Keep in mind the 6550's have more than ~~~2k~~ hours,,
all the sheen is rubed off. Still in all, this lil wide band delivers stunning highs. Exteremely accurate, with no coloration , zero fatigue = 
SUCCESS!!!!
Did not come cheap. 
I am the only YTer showing off the DavidLouis.