Hey guys...we need a little rallying here... - Page 209

http://www.avsforum.com/t/1433151/my-td12m-seos-12-build

whatever happened to the wall mount down angled surround speaker? i cant find it anymore

Thanks Bill!
Actually the acronym BUC is an inside joke with some friends. The look is also growing rather well with me. I just finished gluing up all the bracing as well as the retaining flange for the back panel - need to upload the very latest photos.

Thanks... I wasn't sure if they were going to be the same. Getting anxious.

And the back view after assembling, gluing, screwing and brad-nailing; the bracing and rear panel retainer in place:

Would a Radian 951PB on a SEOS24 require a super tweeter, espcially if not listening on-axis? At roughly what frequency would beaming set in and you start losing horisontal directivity?

I personally don't use one in those types of configurations but other people do. With a 1.4" exit, self-interference should narrow pattern to ~90deg at ~9600hz. You will almost always notice some response anomalies starting around here with a 1.4" exit CD. The same thing happens at around 13khz with a 1" exit. It will get to around 30deg and pretty messy by about 13khz-15khz with a 1.4" exit and around 16-18khz with a 1" exit. These are general rules of thumb and can be affected by the horn and CD.

IMO, you do give up a little bit on the top end with a 1.4 or 1.5" exit CD but it is arguably insignificant. With modern phase plugs and diaphragm materials the response is much better than in the past when a supertweeter was absolutely necessary. Most older large format CDs generally didn't play well above about 6-8khz.

One big advantage of the 951PB is that you can use the TruExtent beryllium diaphragms because it the 951PB's diaphragm is dimensionally a clone of the JBL 4" CDs. Some have argued that the Radian's phase plug is superior to JBL drivers. JBL's are only available in 2" and 1.5" exits and are generally more expensive.

What do you think of a SEOS 6 for the last 1.5-2 octaves over a SEOS 24?

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That would probably work. I haven't seen measurements of the SEOS-6. You would probably need to experiment with crossover frequencies. Using supertweeters isn't something I've implemented much so I can't suggest much from experience.

I'd use a DE35 before I'd use a 1" on SEOS 6, but that is just me. Either way, I'd probably not use either. I'd opt for the Truextent diaphragms before I'd opt for a super tweeter. I am mucking around with horns and larger format drivers in my audio system and to start, I'll let them run all the way up. Get used to that before you decide on something else. You'd be surprised how little info there is about 10khz.

I know I saw them in here somewhere but u can't find them anymore

This little one of mine?
MTG-06-OWS (On Wall Surrounds)

Yes. That's the one. Any plans of a flat pack for this one?

Yeah, the DE35 or Beyma CP21/F are the most commonly used to the best of my knowledge.

If you are planning to use active DSP, it might not cost any more to use TruExtent Berylliums vs adding the super tweeter, an extra channel of amplification and DSP per speaker. I believe the TruExtents can be purchased in the $500 range.

I would personally go with the berylliums in a 2-way. IMO that is the better performing route.

I agree with Stan!

There was talk about tuning it into a flatpack but the question came up onto how long the supply of Aura NS6's would last, the rear mounted woofer made things a little more complicated as well. Some other 6" woofer options were discussed and a dual woofer setup also. A pretty neat 6" was decided on then Bill's Daniel design showed up and things stalled out on that front as I started working on the two B&C designs.

I just spoke to one of their vendors and they claim that there isn't a Be diaphragm available for the 835, only the 950.

Mine are of from Orange County Speaker Repair and for the 950PB I own....didn't mean to mislead.

im surprised its not in higher demand. seems like everyone would want good surround speakers. is everyone just not angling their surrounds down?

Other than getting my hopes up, no worries.

If I were to go with an 1.5" exit driver from JBL that is compatible with their Be diaphragms, the price goes up a fair amount.

Yes, the 835PB is a 3" diaphragm and is not compatible with JBL style diaphragms. I believe only the 950PB 2" exit and 951PB 1.4" exit CDs have 4" diaphragms that are compatible with JBL-style replacement diaphragms. The 951PB is not listed but you can get them from US Speaker by calling. Besides actual JBL 4" diaphragm CD's the Radian 950PB and 951PB are the only drivers I know of that accept TruExtent Beryllium diaphragms.

The 951 may be an OEM model, which is why it's not listed. So the SEOS 24 can work with a TruExtent Be diaphragm after all... Great info, thanks!

I was looking at those and he 8330's but I think I might go with a SEOS speaker and recess it into the wall a bit.

I was looking at those 8340s on ebay today for $300 for a pair. Are there anymore at closer to the price you got them for?

Jeff Bagby is working on a smaller light weight speaker with an 8" woofer, EOS-8, and the nice DNA-205 compression driver. Should be done by the end of the year. I already have the flat packs.


MTG-90 also made a very nice 8" model using all those parts but used a really nice 8" B&C woofer. The only reason I don't have the price listed on them yet is simply because the CNC company hasn't given me the price of the boxes.....even though I picked them up 2 weeks ago. I'll call tomorrow and see if they can tell me what I owe, then figure a price.


Oddly enough, I have empty plastic speaker boxes that look exactly like those JBL 8340 surrounds. And even more strange, the Delta and Beta woofers fit right on!

The problem: I only bought 4 empty boxes as samples back when I got all the other stuff. So if anyone thought it was worth looking into, I'd have to order more.

If it tested good, the entire speaker, including the angled surround sound box would be around $200, and it would use really good parts.

Honestly, just last week while moving things around, I considered getting a price to simply mold a new front plastic baffle with the SEOS-10 built in and just use that same angled rear portion of the box. That would be pretty sweet, but a bit expensive. Plus those boxes are pretty much just for surrounds because they can't really stand up on their own.

I'm talking about these:

http://www.3dhdgear.com/ProductDetails.asp?ProductCode=JBL-8340A&gclid=CLPkgtWeo7QCFQHNOgodeTMAwg

Quick question about the Tempest-12 kit vs. the Karma-12 kit. What are the differences and would someone with say an Onkyo tx-706 reciever & PS3 hear the differences between the two? Thanks Aaron

I don't believe it is OEM but I don't know why it isn't listed. Just call US Speaker to get a quote. I believe it is the same price as the 950.

I have tried searching and didn't find anything. How would one of the Seos-12's compare to the offerings from Chase? I currently have PRO-10's across the front and some older DIY speakers for surrounds. Would moving the PRO-10's to surround duty and using one of the SEOS-12 models up front be an upgrade?