ezeg said:
I used the same inductor values you did, with excellent results. I don't think the slightly larger wire gauge will cause any problems. I used Wells 12W resistors, instead of the spec'ed 10W, and all my caps are 400V Solens; upscaling voltage and wattage ratings a bit is also unlikely to cause problems here.
The optional network is made up of a 10-ohm resistor, 100 uF cap and 1 mH inductor in series, all across the input of the lowpass section. I used the same Jantzen, Solen and Wells components, but I doubt the parts here are particularly critical.
I've also been thinking about a 5.1 DDR solution, but I really don't know just how well that many dipoles will work together. A DDR center channel seems like it ought to be a good thing, though I wonder whether the Neo3PDR needs to be rotated 90 degrees.
Thanks Z33,
Z33 said: "...wonder whether the NEO3PDR needs to be rotated 90 degrees."
Good question, I hadn't thought of that. I called Parts Express,
and they said "...mount it vertically". I have e-mailed Bohlander Graebner with the same question -- no answer yet.
I have to learn to read. I found the optional network, after reading Dan's write up again. ...guess I'll order the parts and try it.
Z33 said: "...wonder whether the NEO3PDR needs to be rotated 90 degrees."
Good question, I hadn't thought of that. I called Parts Express,
and they said "...mount it vertically". I have e-mailed Bohlander Graebner with the same question -- no answer yet.
I have to learn to read. I found the optional network, after reading Dan's write up again. ...guess I'll order the parts and try it.
It would make sense to do so if for no other reason than it matching the other two speakers. Although I've not seen any graphs to back this up I suspect the BG has the same dispersion characteristic as other ribbons, that being, wider horizontal than vertical. I believe Dan makes reference to the limited vertical dispersion in his DDR write up.
Timn8ter said:
Makes sense to me. Kinda begs the question of which would actually be preferable for a center channel mated to DDR fronts, since the center BG is likely to be either somewhat above or below the screen, and therefore bit off optimal ear-height.
Casting about for open baffle sub ideas, I came across an interesting TL:
http://myweb.tiscali.co.uk/nuukspot/decdun/loudspeakers5.html
Something like this might be a good use for yet another Extremis per side, although I don't recall anyone yet using an Extremis in just this way. Might be fun to play with, though.
As is the case with nearly every center channel speaker. Since listeners are generally seated during the movie/session just tilt the speaker up or down depending on it's location. Can't be any worse than any other center channel and most likely better. Horizontal dispersion should be pretty good which is what you really want anyway.
This afternoon I finished the woodworking and assembly for my DDRs. Tomorrow I plan to prime and then paint the cabs.
I have about 1/2 the x-over components in house and the remainder will arrive probably by the end of the week. They should be playing music by sunday!
nate
I have about 1/2 the x-over components in house and the remainder will arrive probably by the end of the week. They should be playing music by sunday!
nate
Without a doubt! I feel that my current speakers are pretty good, but I am always looking to try something different. I have 110 watts of Audio Research tube power and I'm hoping that will be enough ;-)
The biggest problem that I've been having is how to implement my 15" Adire Tempest into this system! Any suggestions for an OB or LT design on a limited budget? I already have two channels of amplification, I just need a sub pre.
Nate
The biggest problem that I've been having is how to implement my 15" Adire Tempest into this system! Any suggestions for an OB or LT design on a limited budget? I already have two channels of amplification, I just need a sub pre.
Nate
Thanks tim-
yes I do have room, but I would like to stick with an ob or sealed lt design.
I've heard the Tempest horn and while it is quite good I don't think that it fits with my apartment lifstyle....
Nate
yes I do have room, but I would like to stick with an ob or sealed lt design.
I've heard the Tempest horn and while it is quite good I don't think that it fits with my apartment lifstyle....
Nate
One of Dan's suggestions was to put a sideways mounted Tempest at the base of each DDR panel. Since you only have one that doesn't seem like an option unless you want to purchase another Tempest. My concern with that idea is the side to side motion of the panel created by the sideways mounted Tempest. I'm going with the Linkwitz Dipole Woofer2.
A good sealed version of the Tempest will be a bit large. Mine currently resides in an 8 cu. ft. cab which gives it a nice low Q.
Perhaps you should just mock up some kind of separate OB for the Tempest and see how it goes.
A good sealed version of the Tempest will be a bit large. Mine currently resides in an 8 cu. ft. cab which gives it a nice low Q.
Perhaps you should just mock up some kind of separate OB for the Tempest and see how it goes.
Ezeg,
You would rather go DDR all around instead of Kit2641 and LCR?
I find the LCRs are outstanding for HT and do fine for music. Now, I'm really curious.
thanks,
Al
You would rather go DDR all around instead of Kit2641 and LCR?
I find the LCRs are outstanding for HT and do fine for music. Now, I'm really curious.
thanks,
Al
I added the optional network to the DDR's earlier this week.
During A-B hearing tests I thought the network diminished the
midrange a little -- very little, it could have been my
imagination. My wife has better hearing than me and she could't
hear any differance at all. The extra $30/speaker probably
not worth it for me.
Yesterday I started to make a DDR center channel cabnet. The baffel
will be 12 inches high and 27.5 inches wide. It will be open
on the sides and back, with some braceing of course so the TV
can sit on top.
Al,
I really like the Exodus LCR sound. The DDR's have a more open
sound that I enjoy. I will probably fire the LCR's and/or the 2641's
up again, when I replace the TV with a front projector. I
think, having a TV between the LCR's and/or 2641's may mess up the sound stage.
The Exodus 2641's were way too bright for me in my
small room. My front speakers sit 6 feet in front of my seating position.
However, I have added mid range absorbers since I
tried the 2641's. I'll probably try them again, with absorbers in place. I'm going
to ware out the Extremii, moving them from one cabinet to another.
During A-B hearing tests I thought the network diminished the
midrange a little -- very little, it could have been my
imagination. My wife has better hearing than me and she could't
hear any differance at all. The extra $30/speaker probably
not worth it for me.
Yesterday I started to make a DDR center channel cabnet. The baffel
will be 12 inches high and 27.5 inches wide. It will be open
on the sides and back, with some braceing of course so the TV
can sit on top.
Al,
I really like the Exodus LCR sound. The DDR's have a more open
sound that I enjoy. I will probably fire the LCR's and/or the 2641's
up again, when I replace the TV with a front projector. I
think, having a TV between the LCR's and/or 2641's may mess up the sound stage.
The Exodus 2641's were way too bright for me in my
small room. My front speakers sit 6 feet in front of my seating position.
However, I have added mid range absorbers since I
tried the 2641's. I'll probably try them again, with absorbers in place. I'm going
to ware out the Extremii, moving them from one cabinet to another.
ezeg, I'm going to be building a pair of DDR's, and am interested in your center project. will you be rotating the Neo3 to vertical for horizontal dispersion, or keeping it in the same configuration relative to the Extremii?
Eric
Eric
ezeg said:
I expect the usefulness of the impedance correction depends a lot on the amp. The UCD modules I've been playing with like the change, but it's not as simple as more or less mids. It's more that the lower mids seem smoother, sweeter somehow. It's as though the amps are responding not so much to the impedance peak itself, as to the slope of the peak, if you know what I mean. With the Ball amps, I heard no change at all.
I'm interested to hear how you like the DDR center. I've decided to go head with an Extremis-based TL sub design to extend the DDRs, and just got Martin's worksheets to do the modeling. I know what a big TL sub can do, and I'm real curious what a small one is capable of, given the quality and excursion capabilities of the Extremis. I think it can go all the way down, and with little coloration. That done, I intend to add a center as well.
Z33,
Have you considered Mpyre Audio's 65x 6.5" Subwoofer?
http://www.acoustic-visions.com/~acoustic/products/speakers/car_audio/mpyre65x.shtml
Have you considered Mpyre Audio's 65x 6.5" Subwoofer?
http://www.acoustic-visions.com/~acoustic/products/speakers/car_audio/mpyre65x.shtml
ezeg said:
I hadn't, but I think I will.
That looks like a little monster, XBL2 and all. Have you heard one?Z33,
No, I haven't heard the Mpyre Audio's 65x 6.5" Subwoofer.
I tried out the DDR center last night. With the extra baffel
area --TV, top, and Bottom -- it is way too bassey. I tried it on
top of the TV without the top on the cabnet; it was better
but still too much bass. Also, on top of the TV it caused some
magnetic picture distortion and picked some buzz. I'm not
sure what I'll do now.
No, I haven't heard the Mpyre Audio's 65x 6.5" Subwoofer.
I tried out the DDR center last night. With the extra baffel
area --TV, top, and Bottom -- it is way too bassey. I tried it on
top of the TV without the top on the cabnet; it was better
but still too much bass. Also, on top of the TV it caused some
magnetic picture distortion and picked some buzz. I'm not
sure what I'll do now.
ezeg said:
That 65x looks pretty impressive, but I'd expect to get a better timbre match using another Extremis. I'll model both and see what cooks. The 65x is purpose-built, and not that much more expensive.
I've been considering center placement options as well. My DDR fronts are actually a couple of feet in front of my screen. My current Polk CSI-5 center is under the screen, but I'm thinking the best DDR solution is to place the center panel either below and in front of the screen, or above, angled appropriately in either case. I don't think I'd add any sides to the flat panel; the DDR likes the open air, and space behind.
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