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Old 17th September 2005, 08:57 AM   #11
Svante is offline Svante  Sweden
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As has already been said, the Qts of this driver is far too high to fit in a bass-reflex box. Furthermore, a box of 40 litres is far too small for two drivers with a Vas of 62 litres. And finally, 18 or even 28 Hz tuning is far too low for this driver with an fs of 40 Hz.

The simulated response of your two designs are shown in the figure below, black being the original design, blue has the changed tuning of 28 Hz. If you keep th 40 litre box and do isobaric mounting, put a great deal of stuffing in the box (not too near the vent, though) and tune the vent to 40 Hz, you get the red curve, and if you manage to lower the Qts value to 0.5 you get the green curve (with not too much stuffing).

If you do not want the isobaric mounting, you can get the same result with a 160 litre box and the drivers mounted side by side. In this case you will get a 6 dB increased sensitivity and maximum output level.

The Qts value can be lowered either by using a special amplifier with negative output resistance, or by fitting a basket filled with damping material on the back of the driver. The air from the driver should be forced through the damping material.

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Old 17th September 2005, 08:27 PM   #12
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RE:
The Qts value can be lowered either by using a special amplifier with negative output resistance, or by fitting a basket filled with damping material on the back of the driver. The air from the driver should be forced through the damping material.

Crazy didn't know you could change the qts that easy I thought youd have to physically change the parts like the spider.



I like pictures so feel free to post. I just got a pair of 10" off ebay for $13 cdn (local pickup so no shipping either) They look like out of like mid 80's floor standers. Will be trying them as a computer sub at hopefully ~33Hz ported but I need to do measurements first.
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Old 21st September 2005, 02:51 PM   #13
tade is offline tade  United States
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OK, i am done messing around with stupid cheap drivers. I am gonna drop some money on a dayton twelve inch hifi sub. It is very exciting, wish me luck!

I will be posting on "tade no subwoofer"

Hopefully, i wont screw up with WinIsd again!

Thanks for all the help!
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Old 21st September 2005, 02:55 PM   #14
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which dayton? DVC, Quatro, Titanic?
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Old 21st September 2005, 02:57 PM   #15
tade is offline tade  United States
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oh, hmm
here is the link:
http://www.partsexpress.com/pe/showd...number=295-464
It is the DAYTON RSS315HF-4 12" HIGH FIDELITY SUBWOOFER
Looks verrry pretty!
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