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Old 6th January 2011, 06:23 AM   #21
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Quote:
Originally Posted by buzzforb View Post
You had to throw in a new twist, didn't you. I will be investigating this today. On the Tysen design, do i stand to gain anything by executing a dipole, or is it bipole, with the A7. I know i get increased SPL, but is their any other benefit? What is to be gained from a larger enclosure? Sorry about all the questions. I know you guys "in the know" probably get tired of answering them. The forum is so vast it is really time consuming trying to weed though everything.

Since Dave didn't immediately pipe in, let me opine that you could theoretically implement a dipole with any driver that is not itself sealed, but with various degrees of success - but I think you probably mean bipole. I think whether that's an appropriate approach rather depends on the specific application - i.e. your room /listening habits & tastes.


From my personal experience with the A7 ( I have a single running right now as center channel in a small HT system, and prior to that spent a fair bit of time listening to them at Dave's place), as well as several configuration of bipole designs over the past few years, I'd imagine a pair of A7 per enclosure could certainly raise some eyebrows.



re Tysen - the original concept of this particular design was to add a small woofer to a single wide-band mid-tweeter crossed over rather lower than "normal" , in as compact a footprint enclosure as the drivers could fit

but of course, one can't help but 'spose that more would be better - we just haven't got around to prototyping one yet
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Old 6th January 2011, 07:07 AM   #22
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Dave, do you know the year it was published?
Around 1950 IIRC. I have a photocopy of the original & the reprint by aXp

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Old 6th January 2011, 07:15 AM   #23
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Quote:
Originally Posted by buzzforb View Post
On the Tysen design, do i stand to gain anything by executing a ... bipole, with the A7. I know i get increased SPL, but is their any other benefit?
Tysen was carefully manipulated to make the simple driver selection work. The box, currently code named superTysen, will likely have 2 A7 in a variation of a bipole (a development of the Castle config) primarily for its ability to provide BSC and give more freedom on the XO point.

Quote:
What is to be gained from a larger enclosure?
As a generalization, more bass. But each driver, in each box style, usually has a volume range that is optimum. For my ap somewhere between 5 & 9 litre for each A7. Each SDX7 will need about 14 litre effective volume.

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Old 6th January 2011, 10:44 AM   #24
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Perhaps it would be helpful to give my specific intentions for this build. I am looking to build my first pair of speakers for a living room that is roughly 16' x 16'. Being that i am young and have kids, it has all the family goodies like furniture, TV, entertainment system, and the ocasional temporary rocket ship tent. While we will be using these same speakers for watching TV, we listen to a lot of music and this is what i want to optimize them for. I would love to do dipoles but realize that my listenening situtation will not allow for it. I need speakers that are not super peculiar in term of positioning and sound awesome. Easy enough, right. The bipole is interesting for all the reasons above, but i am unsure about its depedence on positioning. I am just as willing to stick two A7's on the front if it will help with woofer integration, as I believe this is porbably a very good idea in terms of supplementing the FR driver I choose. I am a very skilled woodworker, so this is not a limitation. ANy problem encountered in this area can be supplemented by my local Quaker neighbor who could build a house with a knife and glue. I have been toying with the idea of doing something like the B&W nautilus designs for the A7's sitting on top of a cabinet like their 802 series. As i said, I am willing to do anything in terms of the enclosure, if it will help sound. I would love for you guys to do all the development work for me, but i understand you have other sucklings to attend to. THanks for the help so far!
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Old 6th January 2011, 07:35 PM   #25
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A true bipole needs to be at least a couple feet out from the wall, and if not considerable wider than deep will have an on-axis bipole dip/suck out. Moving the 2nd driver to the top/side reduces these issues. 2 drivers on the front means having a filter on one driver to get the BSC, the hop is with side or top mount 2nd driver the BSC benefits can be had without a filter. And in my room i effectively have no ceiling bounce so top mounted makes sense (+ the castle microTower experiment worked so well)

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Old 6th January 2011, 11:02 PM   #26
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I was only speaking of the possibilty of a bipole in a super tysen type setup. This FAST based design is what intrigues me. In one thread, you spoke of a double A7 tysen with multiple woofers. This sounds interestiing but perhaps over my head for first build. I will do some reading a get back to you.
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Old 6th January 2011, 11:12 PM   #27
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Quote:
Originally Posted by buzzforb View Post
This FAST based design is what intrigues me.
There are huge swaths of potential in FAST. I have posted a few examples & there are many others (many of them OB)

Quote:
In one thread, you spoke of a double A7 tysen with multiple woofers. This sounds interestiing but perhaps over my head for first build.
It is not all that different conceptually than the original Tysen. Bigger with 2xA7 & 4xSDX7 per box.

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Old 6th January 2011, 11:23 PM   #28
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You spoke earlier of getting the A7 in a TL while still using the complimentary woofer. I may be wrong about this. What about a push-push woofer enclosure with A7 TL rapping around and down the speaker length. I don't know if the push-push is a sealed sytem. I will go back and invetisgate.
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Old 7th January 2011, 01:03 AM   #29
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The push-push is sealed. The TLs for the A7 are short and i'd like to vent them out the back.

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Old 7th January 2011, 01:05 AM   #30
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Realized this after posting. Would altering the shape of the baffle to something like the B&W's, or even the Onkens, improve repsonse.

Last edited by buzzforb; 7th January 2011 at 01:09 AM.
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