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Dayton Audio ST385-8 15" Series II Woofer
whats the recommended ported enclosure for it
According to BassBox Pro (referenced below for your convenience), the optimum ported enclosure for this speaker will be approximately 4.5ft³ interior volume. You'd want to use two port tubes, each 3" diameter and 17" in length. This would provide an F3 frequency of around 28Hz. As ThaiBoxing mentions, this kind of recommendation does not factor in the acoustic characteristics of your listening area or specific application, and as such, should be used as a good "starting point" for your design.
Date published: 2012-09-02
what port diameter and length would work in a 3 cubic foot box?
My Dayton series II 15" woofers are in a sealed box of 3 cubic feet. I know a vented box should ideally be much bigger to acheive optimal depth. However, I would like to increase the depth of the bass as much as I can within the current box. What do you recommend as far as port length and diameter? The woofer is in a three way passive system handling the frequencies from 312Hz on down as low as we can get it to go.
In your 3.0ft³ enclosure, I would suggest two 3" ports, each about 24" in length. This will put your F3 frequency down to approximately 32-33Hz.
Date published: 2012-09-02
What port size[s] would I need for a 6.5 cu ft box. please?
I'm hoping to hear my pipe organ records as they should be!
In your 6.5ft³ enclosure, you'd want two 3" ports about 11" long each. This will tune your box to around 21Hz, and provide an F3 frequency of 23Hz. In this configuration, the ST385 should handle at least 200 watts before running into any excursion problems.
Date published: 2012-07-18
if I were to put this driver in a 10 qubic ft sealed box what would be my low freq cut off point. my free online calculator suggests 41 hrtz for 2.5
cu.ft the problem is it doesn't allow input for different box sizes. 41 isn't bad for that sized box but I wouldn't mind at all buildinga bigger box if I could get down in the 20's of hertzes.
In a sealed box, I don't see a lot of changes in the F3 or 3 db down point. The main difference in the larger cabinet is the rolloff slope. The 2.5 cubic foot box is 15 db down at 20 Hz and the 10 cubic foot box is 9 db down at the same frequency. The cone is also not controlled as well in the larger box.
Date published: 2012-11-27
Witch 15" woofers will fit the PA knock-down trapezoid speaker cabinet part # 245-326, and what is the top 3 woofers that fit.
There are many many options that will work in that enclosure. The top three can only be determined by your specific application requirements.
Date published: 2014-01-20
If I wanted to create a vented design [4.5 cubic feet] via a rounded edges slotted port or a 4" port, what what the size or length be, respectively? I'm trying to minimize port chuff on the bottom end.
A dual flared 4" port will need to be 14" long for a tuning frequency of 22 Hz. A slot port would need to be 3" x 6" and 20" long for the same tune. For the lowest vent velocity, the slot port will likely be better.
Date published: 2014-02-13