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Multi-Way Conventional loudspeakers with crossovers

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Old 16th July 2012, 06:05 PM   #1
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Default SB Acoustic 3W

Hi,

I have been looking for a while for a 3 way project using SB Acoustic drivers. I wanted to have a small tower that can deliver good base extension and a great midrange for jazz and rock music. I have heard such a project in our regional DIY annual meeting but a lot of thing wheren't exactly what I wanted...
I found eactly what I wanted at Rabu Acoustic.

3 vejs Sb Acustics

Since I am mostly a cabinet maker, I am not capable of designing crossover or calculating phases etc... Rabu Acoustic is a Danish vender of Sb Acoustic that has designed a 3 way using on each side:

1 x SB-Acoustics SB29RDC-C000-4
1 x SB12MNRX25-4
2 x SB17NRXC35-8

I know that this combinaison of drivers is a winner, the only things I am worried about is the crossover design. As I said, I know nothing about crossover design but if you read the writeup of the design, his first music test was done with AC/DC and Megadeth....!!! I am no stranger to metal music but is it possible to evaluate a crossover design with that type of music ??

Click the image to open in full size.

Please reassure me ....I am about to start this great project!!!

THX
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Old 17th July 2012, 08:13 PM   #2
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Hi Pierre !


See another project : Ekta GrandeScanSpeak 18W/
The crossover seems to be similar.

The genre of music doesn't determine the quality of listening.
I can test my loudspeaker with Pussy Cat Dolls , their disc is well done.
Classical music is better for tonal balance.
When i see this picture, no problem ...
Click the image to open in full size.
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Old 18th July 2012, 01:11 AM   #3
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There was this SB thread not long time ago...
SB Acoustics 3 ways
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Old 18th July 2012, 05:31 AM   #4
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Here is yet another 3 way design wich to me looks very nice.
Zaph|Audio - SB12.3 3-Way Tower
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Old 18th July 2012, 01:08 PM   #5
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One thing I find a little odd on that is the padding on the midrange is more than than on the tweeter. The tweeter is about 4.5db more efficient than the midrange, so I would have expected the tweeter to be more padded down that the mid...

Also with the dual woofers (at 89db sensitivity each) I would expect the mid with that much padding would be lacking...

Of course without seeing any measurements of the drivers on baffle I'm just speculating... I haven't tried to work out what the crossover points are with those components either.

I've just bought a pair of the SB12MNRX25-4's myself. Most impressed with the build quality!!
edit: I just modeled with my measured t/s params for the SB12 and adding 2.7 ohms series resistance drops the spl by about 2db at 5W input but also changes the QTS enough to get a much lower response out of the driver using a bigger volume (power handling is much worse though).

Tony.
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Last edited by wintermute; 18th July 2012 at 01:28 PM. Reason: add comment about 4" and unibox
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Old 18th July 2012, 01:57 PM   #6
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You can see a response here ?

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Old 18th July 2012, 09:51 PM   #7
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That is just the SB12W ie only the mid driver, not the whole speaker if the translation of the site was correct... It does seem a bit extended on the high end though...

Tony.
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