dual 8" bass bins driver suggestions?? - diyAudio
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Old 3rd December 2010, 08:07 PM   #1
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Default dual 8" bass bins driver suggestions??

Limited by about 9" cabinet width since I am placing my mains on top and SAF

Will actively cross to my mains around 200hz

Will also have a seperate dedicated sub in the corner for LFE effects
so SQ is the goal

If someone has a succesfull build to share I don't mind not re-inventing the wheel

Seems like the Dayton RSS210 might be a candidate with 2 in series

Thanks
John
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Old 3rd December 2010, 08:38 PM   #2
jbell is offline jbell  United States
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shameless plug for one of mikes designs -- sounds like it's exactly what you are looking for.

Reed Exodus Anarchy 25hz Tapped Horn - AVS Forum
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Old 3rd December 2010, 08:48 PM   #3
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Don't think this will work with 200hz crossover
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Old 3rd December 2010, 10:19 PM   #4
18Hurts is offline 18Hurts  United States
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How deep can the woofer/sub be?

9 inches wide and I'm assuming about 30 inches tall or taller since you must be using a very small speaker that it needs a 200 Hz crossover.

Assuming you'll use 1/2 inch plywood, your "inside" box volume would be about 2.5 cubic feet after removing the driver displacement (external measurements of 9 W x 30 H x 19.2 D) If SAF is your thing, you might cut them down to 13" deep or around 1.5 cubic feet.

The largest sub you can fit in a box that narrow would be the Tangband W8Q-1071F which is an 8 x 12" subwoofer. Rated Fs of 27 Hz and you could use dual 12" passive radiators on either side of the cabinet and tune them to your room. (Don't forget the cross braces!)

The inner basket frame is 7.925 inches so it will fit if you use 1/2" braced plywood. Be forewarned it is a 4 ohm speaker so take that into account.

What kind of speakers are you using for the mains that require them to be crossed that high?

Last edited by 18Hurts; 3rd December 2010 at 10:31 PM.
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Old 3rd December 2010, 10:40 PM   #5
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9" w x 16" d x about 30" tall sounds right

That TB speaker is one I had not noticed and would fit but I wonder about the SQ versus the Dayton RSS210's

The TB has a huge rising impedance

I should've mention I have planned to "step" the sides of the bass bins
from 9" at top to 10.5" so I will have the inside width for any 8" woofer.

Is there any issue with series connection of a pair of 4ohm?

Last edited by johnmark; 3rd December 2010 at 10:43 PM.
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Old 3rd December 2010, 11:02 PM   #6
18Hurts is offline 18Hurts  United States
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You have about 2 cubic feet to work with--the Dayton pair and single TB are very close! Fs of the Dayton is 28 Hz but drop it to 27 Hz for two of them which equals the TB. The TB sensitivity is 88 but a pair of Daytons is close at 86.5 (single is low 83.5 dB) Vas of the Dayton is 1.14 cubic feet each with the TB requiring 2.47 cubic feet.

The TB has a larger Xmax but a pair of Daytons make up for that. Kind of a coin flip between the two unless cost is a concern. TB costs $88 for one and a pair of Daytons is about $194. If you're going to run high power, the Daytons might be the ticket.
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Old 3rd December 2010, 11:08 PM   #7
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Will the Daytons go that low in a sealed box ?
I don't have any sim software...
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Old 3rd December 2010, 11:30 PM   #8
18Hurts is offline 18Hurts  United States
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If you're going to run sealed, go for the Daytons

The .50 Qts really wants a sealed enclosure with the TB .34 Qts wanting ported. Since the 2 cu ft size of your box, the smaller Vas for a pair of Daytons would work better in a sealed box.

In theory, the Daytons should head into the 20's IF they are in a 2.28 cu ft enclosure--you will "gain" that with about 2 pounds of fill. They handle a ton of power so a mild bass boost at 30 Hz of 3dB shouldn't hurt anything (unless you are hitting them at 500 to 1000 watts)

Since you have chosen car subwoofers, I'm assuming you will hit them with quite a bit of power so a stuffed and sealed cabinet should give you added protection although I'd use a filter set at 20Hz or so to conserve amp power and prevent overexcursion of the dual 8's.
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Old 4th December 2010, 12:19 AM   #9
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I have been considering a similar project and am looking hard a the Kevlar Usher 8" driver. Also, Madisound has Aurasound 8" 4ohm drivers for $20 each. Four would give you two sets of bins with 8ohm each and lots of cone area. Both will fit in my 9"wide 33L boxes. Might work for you.
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Old 4th December 2010, 03:06 AM   #10
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What interests me at Madisound on sale is the LAT 700 as it would fit a narrow bass bin, but I can't find any comments in the DIY community. And they are still more expensive than two 8" drivers, but look so cool..


"Tymphany LAT700 8/8 ohm Subwoofer

Stereo 8 ohm or wire in parallel for mono 4 ohm or wire in series for mono 16 ohm.

The LAT 700 has the power of two 12" subwoofers in a sleek tube shaped transducer."



Those 8" Aurosound don't look like subs



Don't call those those RSS210's a car sub or I might loose interest, looking for SQ no boom

Last edited by johnmark; 4th December 2010 at 03:10 AM.
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