I think it was badman who did some testing of dome tweeters in small waveguides, so I mounted a ScanSpeak 9700 into a little 1" Parts Express waveguide. Holy smokes, that thing came alive - way too much for the little 2 way I was planning, but a fun test.
There are also some well regarded beryllium dome tweeters out there, SB and ScanSpeak both make some I think, if the OP wants Be
Here's the article, FWIW (the author posts as badman here)
http://www.enjoythemusic.com/diy/0311/supertweeter.htm
Wow, look what's written here!
06-13-2015, 08:35 AM
http://www.audioheritage.org/vbullet...Monitor/page51
Could somebody please have the (exact) dimensions of this WG
Port or Noport, that's the question.
K2 and Everests have rear ports. Why?
(i make curved back, if it makes any difference, in terms of port tuned to 27Hz)
M2 has front-mounted ports, obviously, they are used often in Theatres as well, while installed directly to the wall, same with Sub18, there is no question.
While drawing CNC files got opportunity reduce the height of monsters significally and measures overall, just inside construction went complicated.
Especially mounting long front ports.
Rear mounting allows install straight ports with ease, looking spead like DD60000.
Or go to sealed (!?) - what I get is minus 6db at 32Hz.
The M2 is a equalised bass reflex system. The K9900 and the DD67000 are not.
The later rely on the proximity of room boundaries to augment the bass extension and bass output below 100 hertz. The rear placement of the port supports this function as the rear ports are closer to the room boundaries than a front firing port.
For my “Project Widget” project, since I was attempting to create an ultimate system, I mocked up everything prior to the final build.
I mocked up baffle shapes around the mid horn, relative driver placement, and I built both sealed and ported enclosures of different sizes for both the 10” TAD midbass driver and the JBL Sub1500.
For my drivers in this application, sealed was the way to go for the Sub1500.
Widget
Got the internal structure in place.
Measures are not monsters anymore; If compared to the real beasts.
Maybe Fountec UHF ribbons, maybe even round shape to keep options open, vertical or horisontal.
The point is if you are going the diy route you are more likely to achieve the optimal bass response with some low frequency EQ using a 2216nd woofer. Being reliant on enclosure placement with a rear port to achieve optimal bass is very much a hit and miss affair. You might sacrifice imaging for good bass or visa versa.
The 2216nd will take a stack of power and has ample cone excursion for electrical EQ.
In my own experience using room boundaries to obtain a satisfactory bass response requires movement of the woofer in a 3D axis. Moving an enclosure back and force and or sideways can work but the distance of the woofer from the floor can also effect boundary coupling and impact on higher frequencies.
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