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Old 11th July 2009, 02:29 PM   #1
jerryo is offline jerryo  Isle of Man
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Default Best possible use for........

I have a pair of Linn Isobariks which are taking up to much space according to my wife so I am working on a smaller design to keep her happy.
I would like to use the bass drivers (B139) of which there are 4 of. I have been looking at the "Ripole" configuration as this gives the smallest box size but the "U" frame and "H" frame are also possible if it is thought the drivers would suit.
What is the; "best possible use of 4 B139 bass drivers"?
I am not looking for high SPL's just some good clean bass from a smaller box than an Isobarik.
Many thanks
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Old 11th July 2009, 04:44 PM   #2
GM is offline GM  United States
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Don't know how big the Linns are, but a sealed isobaric pair of KEFs in ~ 1 ft^3 total is either a bookshelf or very slender profile floor standing speaker to me............

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Old 11th July 2009, 05:04 PM   #3
jerryo is offline jerryo  Isle of Man
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Hi GM,
the LInn Isobariks are roughly 75cm high, 37cm wide and 40cm deep and that's not including the stands so a fair size for the room that I have them in. Tall and skinny would be good thing....
I am considering a simple line array for the hell of it so my thinking was for the B139 bass units to cover below 200Hz with a curved full range line array for the rest. But I would like some opinions on which configuration to use for the bass drivers.
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Old 11th July 2009, 05:22 PM   #4
GM is offline GM  United States
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Greets!

How tall? I mean if height isn't an issue, then a pipe loaded bipolar pair in a ~driver width x (2) driver depth x as tall as required to get the desired box volume (Vb) seems the way to get the most out of them in a narrow as possible baffle.

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Old 12th July 2009, 01:31 AM   #5
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Quote:
Originally posted by GM
How tall? I mean if height isn't an issue, then a pipe loaded bipolar pair
Not smaller...

Click the image to open in full size.

http://p10hifi.net/planet10/TLS/down...map-041107.pdf

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Old 12th July 2009, 12:38 PM   #6
Piek is offline Piek  Europe
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Hey,

I have 4 of B139 in use. I think the smallest approach would be 4 enclosures like 25L each with very small footprint matching the earheight with mid and tweeter on top, stuffed with rockwool and some equalisation with the new Hypex DSP modules to your desired bass curve. That would be awesome. I had a similar system (sans hypex) switched back to TML because of trying passive crossovers. I would not use these in Ripol, the SPL will not be sufficent from my experience, except for nearfield listening.

-Micha
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Old 12th July 2009, 04:24 PM   #7
jerryo is offline jerryo  Isle of Man
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Hello Planet10 and GM, I can see the bipolar pipe route would be very interesting although what sort of height are we talking about? One face of these could incorporate the line array's I have in mind!!
I know there are alot of arguments for and against line arrays but I think I will give it ago (suck it and see)
Is there any way of reducing the height of these pipes by a further fold?
Hi Piek, I'm not exactly sure what you mean; got a link to go to?
I have seen a German pdf that gives a ripole with B139's although you will probably be right as far as SPL's are concerned especially with a view to use a line array.
Planet10 I'll check out the link that you gave me.
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Old 12th July 2009, 04:38 PM   #8
Piek is offline Piek  Europe
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What I tried to say is: Closed Box, 25l each + equalisation.
For may understanding of 'room SPL' they will hardly reach that as dipoles.

The suggested DSP is this: http://www.hypex.nl/docs/AS2.100/Manual%20AS2.100.pdf For sure this would help with a line array.

-Micha
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Old 13th July 2009, 07:23 AM   #9
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Quote:
Originally posted by jerryo
Is there any way of reducing the height of these pipes by a further fold?
The straight pipe version is just over 8' tall.

Click the image to open in full size.

http://p10hifi.net/planet10/TLS/down...map-300609.pdf

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Old 13th July 2009, 02:51 PM   #10
jerryo is offline jerryo  Isle of Man
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HI Dave (planet10)
In terms of SPL and efficiency are they going to be able to give enough output to compete with a line array without to much equalisation?
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