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Better then sb12pac
Better then sb12pac
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Old 25th March 2020, 05:52 PM   #1
celef is offline celef
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Default Better then sb12pac

I think sb12pac sounds just fantastic!

but as always, it does not matter how good things are, we just want more, in my case i want a tad more bass reach, not much, only slightly

a small 4.5" midwoofer with a free air resonace at ~45hz and total Q of 0.3 would suit my needs perfect, any ideas?
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Old 25th March 2020, 06:12 PM   #2
4real is offline 4real  Netherlands
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If you extend the size requirement a tiny bit there are some options: Loudspeaker Database
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Old 25th March 2020, 08:55 PM   #3
celef is offline celef
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No, 4” seems to be the perfect size
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Old 25th March 2020, 09:23 PM   #4
5th element is offline 5th element  United Kingdom
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Get modelling different 4" drivers and see which ones will give you what you want. I'd start with the SB12 ceramic and metal drivers. The W12CY magnesium cone from seas will probably do quite well too.
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Old 26th March 2020, 01:44 AM   #5
oon_the_kid is offline oon_the_kid  Malaysia
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I have looked quite a bit in this area. I think 12 PAC is as more or less as low as it goes for a midwoofer. Beyond that they are called subwoofers. I see some from Tangband. Only thing is expanding the box and you can tune the port all the way down to 50Hz...

Oon
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Old 26th March 2020, 02:30 AM   #6
oohms is offline oohms  Australia
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Something like the peerless 830855 might do bass in a smaller ported enclosure, but at 4 inches, there are going to be a lot of tradeoffs. I would say the sb12pac is better overall, and if you make a solution that comfortably reaches 80hz, turning it into a 2.1 setup is a much better idea if it needs to be compact
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Old 26th March 2020, 02:48 AM   #7
oon_the_kid is offline oon_the_kid  Malaysia
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The other angle would be to use the 12PAC passive radiator. Might allow for more bass and a small cabinet. But you will need to simulate it properly.

Oon
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Old 26th March 2020, 05:50 AM   #8
rabbitz is offline rabbitz  Australia
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The 12PAC PR will not help. With a single it's useless but 2 helps but fine tuning is an issue.

Better to increase the Fb to give the roll off a hump which gives a more balanced bottom end. I've tuned mine to 78Hz which gives an F3=72Hz.

See pic... green vented, purple PRx2.

I've used a few 4" midwoofers such as the 830870, NE123W-08 but they don't go lower. The best for a bit of more bottom end is SB12NRX25-4 as it can give an F3 below 60Hz. Look at Jeff Bagby's article on the Soprano and note the suggested vent tuning to give a roll off hump.
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Last edited by rabbitz; 26th March 2020 at 05:58 AM.
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Old 26th March 2020, 05:22 PM   #9
celef is offline celef
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The seas excel driver looks excellent, but i doubt that official t/s parameters are correct, has anyone measured this driver?
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Old 26th March 2020, 06:46 PM   #10
gornir is offline gornir  Sweden
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Better then sb12pac
Quote:
Originally Posted by celef View Post
The seas excel driver looks excellent, but i doubt that official t/s parameters are correct, has anyone measured this driver?
You can read here!

www.audioexcite.com >> Blog Archive >> 4,5″ Driver Measurements!

Regards

/Göran
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