Coaxials: Another DIY Group Project. - Page 55 - AVS Forum | Home Theater Discussions And Reviews
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post #1621 of 1759 Old 05-09-2019, 12:47 AM
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post #1622 of 1759 Old 05-09-2019, 01:15 AM
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Quote:
Originally Posted by Erich H View Post
What type of cabinets do you guys think the 12" coaxial should start with? Cube shape? Large bookshelf? Monkey coffin? Towers?
Towers


With a much simpler square option for those looking for high end surrounds.
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post #1623 of 1759 Old 05-09-2019, 11:00 AM
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Also voting for towers, but...


Assuming a vertical tower with the driver near the top, and a horizontal center channel with the driver near the center, how much would the sound change between the two?

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post #1624 of 1759 Old 05-10-2019, 02:00 PM
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Quote:
Originally Posted by Erich H View Post
What type of cabinets do you guys think the 12" coaxial should start with? Cube shape? Large bookshelf? Monkey coffin? Towers?
I'm sure I'm in the minority, but I'm a fan of the monkey coffin form factor. It's also the only one that would work in my room. But I'm a fan of it in general too.


(The commercial audio world would be in such a better place if it could go back to simple monkey coffin designs, rather than trying to heroically wring decent bass and output from tiny enclosures with 4" or 5" woofers)
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post #1625 of 1759 Old 05-10-2019, 03:24 PM
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I vote monkey coffin but what would the bookshelf be tuned to?

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post #1626 of 1759 Old 05-11-2019, 09:13 AM - Thread Starter
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A tower will be done, and I guess the second flat pack could be the monkey coffin size. Do you guys think either should be angled back a bit? I'm guessing they will be made from Baltic birch.

The coaxial tower size is very close to the size of a 1299. I might see if there's anyway possible for those two designs to share the same cabinet so we can finally have a 1299 flat pack. The good news is that the custom shipping box could be used for both of those cabinets even if they were different. Custom packaging stuff really stinks because minimum orders are 250 boxes......so I have pallets of cardboard boxes taking up lots of space. My garage has like 12 pallets of cardboard boxes in it!

I'm not sure what the smaller bookshelf size would be tuned to, probably around 60hz. That one will need to be drawn out a few different ways to see what people like. I don't know if it should be rear ported or two ports on the front with one above and one below the woofer. Keeping it symmetrical makes a horizontal center channel easier. But to be honest, I don't think these will get built very often in the DIY world as a home theater speaker unless someone needs a lot of output in a shorter cabinet than the HTM-12. My guess is they'll be used more for high sensitivity full range 2 channel.....with an optional center.

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post #1627 of 1759 Old 05-11-2019, 12:54 PM
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I will buy a pair of towers for 2 channel.
Not sure on 12 or 15" until they are released.

It would be pretty easy to turn a tower into a monkey coffin as well. Cut your custom size box and use the baffle as a router guide. I doubt there will be many people tossing this amount of money into surrounds, but someone here will probably do it.

Front port would be nice for easy placement. Given their size I'm assuming they will be next to a wall.
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post #1628 of 1759 Old 05-11-2019, 03:17 PM
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I would want a rear ported “bookshelf” tuned to ~48Hz

That’s more like a two channel speaker. 60Hz isn’t full range

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post #1629 of 1759 Old 05-11-2019, 09:57 PM
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You not going to get full range out of the 12" or 15" in a bookshelf style cabinet, f3 on both of those would likely be in the 60-65hz range. Tune lower and f3 actually goes up.

Large tower cabinets are the only way to get a rough full range extension from either of those, just the way the specs on those drivers are.
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post #1630 of 1759 Old 05-12-2019, 07:59 AM
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Quote:
Originally Posted by mtg90 View Post
You not going to get full range out of the 12" or 15" in a bookshelf style cabinet, f3 on both of those would likely be in the 60-65hz range. Tune lower and f3 actually goes up.



Large tower cabinets are the only way to get a rough full range extension from either of those, just the way the specs on those drivers are.


Ah ok. 60Hz makes sense then.

I think something like the old school Tannoy’s would also be cool as far as box design

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post #1631 of 1759 Old 05-12-2019, 12:03 PM
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the 12's as LR , yeah maybe . .

I saw this , and didn't finish watching ti yet
but


and my untrained eye
what's left of my mind thought -

if not needing a bookshelf size
what could a co-ax really do in a TL design like this . .

could it get to be full range?

i'd build that.

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post #1632 of 1759 Old 05-12-2019, 01:22 PM
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So are these 12 and 15s going to have a flat pack that will yield semi reasonable sizes for use as surround speakers? If the flat packs are going to be built for use as mains rather than surrounds I may just pick up the volts soon. Just rather match my titan 615lx mains with larger coaxial surrounds if possible.
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post #1633 of 1759 Old 05-12-2019, 03:03 PM - Thread Starter
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There will be smaller flat packs made up that could be used for surrounds. But due to the components, they might be kind of expensive for that.
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post #1634 of 1759 Old 05-12-2019, 04:43 PM
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Quote:
Originally Posted by Erich H View Post
There will be smaller flat packs made up that could be used for surrounds. But due to the components, they might be kind of expensive for that.


They would however make an outstanding floor monitor wedges— for those members who have stages in their homes or are really into high end Karaoke!


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post #1635 of 1759 Old 05-14-2019, 01:47 PM
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I don't know if the volume would be adequate, but a format like this would be pretty cool for a coax cabinet.
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post #1636 of 1759 Old 05-14-2019, 02:23 PM
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That isn't too far off what I've built as the prototype cabinets.
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post #1637 of 1759 Old 05-14-2019, 02:33 PM
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I see they are “cat bed” approved


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post #1638 of 1759 Old 05-14-2019, 04:33 PM
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Quote:
Originally Posted by brian6751 View Post
Ah ok. 60Hz makes sense then.

I think something like the old school Tannoy’s would also be cool as far as box design


reading my mind.... I was thinking more along the lines of the DC12i and VX12 though. These are more suited for home theater and would be my vote for the new coax's. I think 60hz would be great since most HT use a sub.




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post #1639 of 1759 Old 05-14-2019, 06:20 PM
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That VX12 is really close to the design of one of the bookshelf enclosure ideas I had for these:
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post #1640 of 1759 Old 05-14-2019, 08:14 PM
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Quote:
Originally Posted by mtg90 View Post
That isn't too far off what I've built as the prototype cabinets.
very cool, looks good!
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post #1641 of 1759 Old 05-15-2019, 07:01 AM
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That VX12 is really close to the design of one of the bookshelf enclosure ideas I had for these:

Yes, I noticed that earlier. Great ideas IMO. Is the 15" cube ported in the rear or sealed?
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post #1642 of 1759 Old 05-25-2019, 01:12 PM
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bump for an interesting thread.
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post #1643 of 1759 Old 05-27-2019, 08:43 AM
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While these might be something of a horizontal shift for me, so I probably won't be getting them, these are still quite interesting. My LCR speakers are a trio of floorstanding Fusion 12s that make use of the Celestion CDX1730, designed and built by someone much more competent than myself.

I'd love to hear how these compare to the SEOS waveguide in speakers like the Fusions, HTs and HTMs.

Reviews of Tannoys, especially the ones with 15" drivers, usually cite a large sense of scale as one of the positives of it along with the benefits of high efficiency.

Correct me if I'm wrong but doesn't a recording have to have a large sense of scale for it to be perceived as such versus every recording sounding that way just because of the speaker used? The former has been my experience with my speakers.

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post #1644 of 1759 Old 05-27-2019, 09:34 AM
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Coaxials: Another DIY Group Project.

Quote:
Originally Posted by RobertChicken View Post

Reviews of Tannoys, especially the ones with 15" drivers, usually cite a large sense of scale as one of the positives of it along with the benefits of high efficiency.


IMO Tannoy hasn’t made a good 15. I've yet to hear any 15" concentric that works well, so that's not a knock on Tannoy.

Their 8”, 10”, and 12” models have always been better. In 10" and 12" they're best of breed so far though. (KEF's 8" Q-series unit is probably better than Tannoy's 8's.)
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post #1645 of 1759 Old 05-28-2019, 10:18 AM
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Originally Posted by mtg90 View Post
Here is the off axis on the 12" (indoor gated - ignore below 300-400hz).
Might have missed it, what compression driver is being used in this design?

Also, holy crap batman those polars!!
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post #1646 of 1759 Old 05-28-2019, 11:22 AM
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CDX1-1731 is being used in these, I liked it in the Titan design as it is one of the more transparent compression drivers that I have used and it works well in these designs too.

I recently finished the 15" coax design and really like how this one turned out. Didn't I say the 15" might measure better then the 12"!

Well here is the on/off axis response (gated) of that one.
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post #1647 of 1759 Old 05-28-2019, 01:54 PM
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CDX1-1731 is being used in these, I liked it in the Titan design as it is one of the more transparent compression drivers that I have used and it works well in these designs too.

I recently finished the 15" coax design and really like how this one turned out. Didn't I say the 15" might measure better then the 12"!

Well here is the on/off axis response (gated) of that one.
Do you have the Titan LX on/off graph on hand to compare the two?
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post #1648 of 1759 Old 05-28-2019, 02:51 PM
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Here is the off axis from the waveguide portion of the normal Titan-615 (CDX1-1446).
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post #1649 of 1759 Old 05-29-2019, 12:54 AM
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Any ETA on these kits?

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post #1650 of 1759 Old 05-29-2019, 01:23 AM
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