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Old 25th October 2013, 12:41 PM   #11
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Hi, I'm not a fan anymore of isobaric load
I'm not fan of double driver arrangement either, go figure...
So it's -2-2=-4
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Old 25th October 2013, 01:52 PM   #12
jerryo is offline jerryo  Isle of Man
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Hi,
the design has in mind the "Mani-2" speaker that has received rave reviews. It will use the same back to back Isobarik arrangement but have greater bass output. These drive units seem to have great bass abilities and I have eight to use so this seemed an interesting way ahead.
Can you tell me why you do not like Isobarik loading and double driver arrangement. There are, I believe, quite a number who do like these arrangements.

Cheers
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Old 25th October 2013, 06:44 PM   #13
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Well, re-reading the thread
A mani-4 is doable !

C'mon, let's get embarked in that silly project !!!
The fullrange-super FAST idea is good; since it's basically an MTM, you can take it to a d'Appolito design, and some say that a 3 way d'Appolito is
even better !

PM me !!!
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Old 25th October 2013, 08:29 PM   #14
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Quote:
Originally Posted by jerryo View Post
(...)Two: use a suitable 3-4" fullrange crossed at around 300 Hz (eg: Monacor Spx-32m looks interesting at the price) but a Jordan/Bandor is also a thought (power issues)
For the tweeter/fullrange I'll arrange a gas tight but removable sub-baffle between the two Isobarik pairs of the Hi Vi D6.8's There will be space available for a small enclosure behind this if required. Because of this distance requirement (200mm) between the bass drivers to allow the fullrange/waveguide I think the fullrange route might be the way to go?!
I want to keep the crossover as simple as possible which also heads in the full range direction I think.

Any thoughts on my plans? (good or bad)

Cheers
An idea (to test some likes and dislikes) is the Audio Nirvanas, Etons...
Eton Symphony 3" Midrange 3-400/A8/25 MG – Matched Pair
Audio Nirvana Full-Range Speakers For Sale. High Efficiency, DIY, Single Driver, Monitor Speakers with no crossover.
http://www.commonsenseaudio.com/an3cfspecs.jpg
http://www.commonsenseaudio.com/an6.5cfspecs.jpg
http://www.commonsenseaudio.com/an6.5neospecs.jpg
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Old 26th October 2013, 10:02 AM   #15
jerryo is offline jerryo  Isle of Man
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Hi Inductor,
I had a look at your driver recommendations: very nice but a little expensive for me and also available only on the other side of the Atlantic to me so shipping would be too much.
They would have to be available in Europe.

Cheers
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Old 26th October 2013, 10:52 AM   #16
jerryo is offline jerryo  Isle of Man
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Hey picowallspeaker,
what is this "silly" project that you refer to? Hmmmm!
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Old 26th October 2013, 12:06 PM   #17
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No please no!
But nothing can stop you to try some prototipal box as you said, then you can make your own opinion. it's just 4 square baffles with hole for the driver; as you said that you want to mount them back to back, there are no problems for mounting the hidden ones, at least if you make the back panel removable. Because there'll be a back panel, right ?
Lots of distorted/modulated bass, I guess ! Then there is the integration with the other(s) driver (s). A suspended one in the between sounds nice ( the back wave should not be refracted )
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Old 26th October 2013, 07:29 PM   #18
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Default Hi-Vi D6.8

Quote:
Originally Posted by jerryo View Post
Can you tell me why you do not like Isobarik loading and double driver arrangement. There are, I believe, quite a number who do like these arrangements.
In this case you don't have anything to benefit from such design, no more sensitivity or anything.

Overview D6.8 Bass-Midrange_HiVi, Inc.
My take with this driver (this is going to be a little risqué...)
: Using 4 drivers for each speaker connected series/parallel, such that 2 drivers share a vented enclosure and two drivers in a sealed one.
The 2 drivers doing the sub service share an extra volume enclosure with VB = 37 to 40L and tuned to FB = 32.0 Hz, this giving for a 3" diam. port a ~30 cm/12" length (/or 27.50 cm/11" for the 40L). The other 2 drivers in the sealed enclosure share a space of 17L. This should play in tune with the required BSC and baffle dimensions. I don't know if the results are desirable or not but the impedance peaks frequencies are 60Hz for the reflex side and 70Hz for the sealed version side of the speaker with expecting sensitivities >90dB (92dB/2.83V/m) without attenuation.

Construction: You can make a test or final box/enclosure where you can remove or change the interior partitions and replace them with bracing as an example. Testing ports would also be available in a way that can be changed, covered or plugged. Have fun.
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Old 26th October 2013, 07:46 PM   #19
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For the top driver (FR) I would start looking at the Faital Pro 4FE32 as your second option...
Faital Pro 4FE32. Buy speakers 4"Faital Pro 4FE32. 4 inch Audio
http://www.faitalpro.com/products/fi...atasheet_8.pdf
FaitalPRO | LF Loudspeakers

http://www.seas.no/index.php?option=...119&Itemid=141
This would also be interesting for a Fi speakers.

Last edited by Inductor; 26th October 2013 at 07:50 PM. Reason: Seas Coax
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Old 27th October 2013, 02:56 AM   #20
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Default Tang Band W5-1611SAF 5" FR

Sorry to shoot for another EU affordable nicety.
Tangband Breitbandlautsprecher W5-1611SAF
http://www.tb-speaker.com/detail/0624_11/w5-1611saf.htm
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