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I could put some of these tweeters on top and back.Two ports are a pro audio solution, usually in hi fi is used just one larger duct to reduce breath noise.
Only has one tweeter surrounded by midrange drivers
"Proprietary controlled directivity - acoustically superior proprietary polygon-oriented, triple-ring radiator high frequency array. This array disperses a precisely focused acoustical power pattern of that of a horn or waveguide without the audible ringing influence of horn flare walls constraining the soundwave for acoustically superior mid-range high frequency performance "
Any patents or science to back that up?
U.S. Patent 9247339
And let’s not forget Donald North’s (engineer at Aurasound) loudspeaker design: http://www.dnaudio.com/DNA%20Speaker.html
$20,000 for a few drivers mounted on boards. Sheesh.
The patent imho does not back up his contention that this is a CD design. In fact, the patent is a little strange and essentially says that light weight transducers should be used for the “faithful reproduction of musical instruments, etc...https://patentimages.storage.googleapis.com/ef/3b/8b/91cfa120a70f05/US9247339.pdfAs much as it is challenging to obtain a patent, and expensive as well, it is important to see if said patent is directly relevant and/or supportive and if he has indeed improved loudspeaker design as it exists today. I don’t see it as so. I see his assertion being obvious and only a small aspect of loudspeaker design. What I think he has done is to patent that assertion for marketing purposes.
What does the impedance curve look like?This is the version with 2 woofers (still called a Double Impact):As epected it goes to 4 ohms or less where there ar e2 woofers, but the big bump at the XO is not going to make a SET happy.dave