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Old 24th September 2009, 07:29 AM   #1
Andy G is offline Andy G  Australia
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Default All SB Acoustics MTM ??

I have a guy looking for something that will do old style rock music nicely, and am thinking of maybe something like an MTM using all SB Acoustics drivers
SB17NRX x2 + SB25STC. (I do have a pair of Vifa DX25's on the shelf I could use as the tweeter instead).

I haven't seen much around using the SB17 yet, and was wondering how much bass one might get from a pair of them.

So, has anyone used them in this sort of configuration yet ??

If so, box sizes, porting etc would save me some work!

TIA AG
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Old 25th September 2009, 02:23 AM   #2
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Andy, Unibox gives me 35L tuned to 35Hz for a single unit, for 'rock' bass with 2 units, 60L @ 38Hz gives a broad low hump below 100Hz for an F3 of 35Hz...

here's a closed box using the 6" and SB tweeter:
http://www.zaphaudio.com/DLR/
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

Last edited by PeteMcK; 25th September 2009 at 02:43 AM.
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Old 25th September 2009, 03:11 AM   #3
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May be Thor alike transmission line? QTS is a bit low but I've build similar to Thor TL with Usher 8945A and the bass was astounding.
Just an idea.
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Old 25th September 2009, 03:40 AM   #4
Andy G is offline Andy G  Australia
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After further discussions, seems like we are back to square one.. He is more something like a WMTMW arrangement. There are a few floating about , but mostly with Dayton RS drivers. eg Khanspires

hmmmmm.. some thinking needed.
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Old 25th September 2009, 04:46 AM   #5
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a pair of these in 100L might be OK if a box that big passes WAF:
https://www.photonage.com.au/speaker...0-p-10448.html
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Old 25th September 2009, 11:52 AM   #6
rabbitz is offline rabbitz  Australia
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Joe's Elsinore could be the ticket as not hugely expensive and a mature clever design. I'm sure it comes with a big sound and is loved by many. Drivers are easy to get and not expensive and the crossover not crazy. There's a thread around here on them.

http://www.customanalogue.com/elsino...nore_index.htm
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Old 25th September 2009, 02:42 PM   #7
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Quote:
Originally Posted by Andy G View Post
After further discussions, seems like we are back to square one.. He is more something like a WMTMW arrangement. There are a few floating about , but mostly with Dayton RS drivers. eg Khanspires

hmmmmm.. some thinking needed.
Admitting this may expose me as a simpleton, but that rolling smiley face made me laugh!

Andy I know this is a little off the mark, but would your friend consider a moderately sized two-way, or is it WMTMW for sure? I know soft cones have fallen out of favor a bit, but I find this midbass very interesting, and have wanted to do something with it for a while:

http://www.madisound.com/catalog/pro...oducts_id=1464

Personally I like the sound of poly cones, though I guess they give up some detail. To me, they seem handle distorted guitars and heavy vocals well, probably because they smooth out the harshness a bit with their high internal damping.

Anyway, with the driver above, you might be able to pull off a 2nd order crossover with the right tweeter, though I'm not sure to what extent that would limit maximum SPL. Plus that phase plug looks cool!

Jim
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Old 25th September 2009, 11:30 PM   #8
blue934 is offline blue934  Canada
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Quote:
Originally Posted by R-Carpenter View Post
May be Thor alike transmission line? QTS is a bit low but I've build similar to Thor TL with Usher 8945A and the bass was astounding.
Just an idea.

would you be able to supply details on this build. i have four 8945A's that i am trying in various configs.

thanks
david
dguenter at telus dot net
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Old 25th September 2009, 11:58 PM   #9
Andy G is offline Andy G  Australia
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Quote:
Originally Posted by rabbitz View Post
Joe's Elsinore could be the ticket as not hugely expensive and a mature clever design. I'm sure it comes with a big sound and is loved by many. Drivers are easy to get and not expensive and the crossover not crazy. There's a thread around here on them.

http://www.customanalogue.com/elsino...nore_index.htm


Thanks Peter,
I'll show him that one when he comes around next.

Last edited by Andy G; 26th September 2009 at 12:04 AM.
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Old 26th September 2009, 12:03 AM   #10
Andy G is offline Andy G  Australia
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Originally Posted by J.R.Freeman View Post
Admitting this may expose me as a simpleton, but that rolling smiley face made me laugh!
http://www.madisound.com/catalog/pro...oducts_id=1464
Ask Peter, that's just how I think.

Yeah, I like poly's too. and have looked at that driver a few times, but shipping them to down-under costs so I haven't got around to using them.

He has an open plan house, so a standard 2-way is going to struggle a bit. + he wants some 'grunt' !

Last edited by Andy G; 26th September 2009 at 12:06 AM.
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