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In Reply to: RE: Transmission line? posted by Lew on August 15, 2014 at 20:04:19
I was thinkin' it looks like driver(s?) go down there .....
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But what would be the good of placing drivers there? We'll have to wait for a response.
The internal volume is separated into two chambers, one for the top/frontfiring woofers, and one for the bottom/rear/upfiring woofers.The upfiring woofers get more boundary reinforcement than the frontfiring ones, and of course we take advantage of that.
Both chambers are reflex loaded, with two pluggable ports. So each chamber can be wide open, one port plugged (which lowers the tuning frequency), or both ports plugged (sealed box). That gives, what, nine different combinations per speaker (if my late-night arithmetic is correct) that you can mess with to fine tune the speaker/room interface at low frequencies. I want the low end to be sufficiently adjustable to work up against the wall, or well out in the room, or with Ralph's amps, or (heaven forbid) with someone else's.
Also your bass sources are spread out in all three dimensions, which should help the in-room bass end up a bit smoother even without all the port options.
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Edits: 10/02/14
you would not want to close the ports, that would affect the rear impedance of the speaker air interface undesirably. you want an open port which is then presented as the inverse of the port impedance on the back of the speaker.
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
If so, I agree. Those ports would be open or else no TL.
I've built two pair of TL woofer systems in my day, one pair of which I dug out of storage to use with my Beveridge 2SW speakers. Mine mimic the classic Bailey design as implemented by Irving M Fried. However, the shape of Duke's cabinet shown in the photo leaves open a question as to what goes where, but odds are that it's a TL, of some kind, IMO.
The splash drivers face upwards and assist with soundstage imaging.
They work quite well too! Duke demonstrated the concept at RMAF last year and again at Newport- they had the speaker set up with a switch so the drivers could be shut off. The soundstage, while still good, is smaller and less focused without them.
I'll bet those do sound nice .... :)
Besides being one of the nicest guys in audio, Duke is also an adventurous and innovative manufacturer. I would love to hear those speakers.
True that.
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I was, and glad we do not disagree :), closing up the port with a driver would be a strange thing. If they are half wave length...well that would lead some interesting discussions about driving it from both ends.....
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
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