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Dayton Audio RSS315HFA-8 12" Reference HF Subwoofer 8 Ohm
what is the best size for a sealed box using it for a home theater
For a nominally flat design (Qcb=.707), 3.42ft.cu., which will give an f3 of 33.4Hz.For a smaller enclosure, try a Qcb of .800, which will give you an f3 of 33.9Hz in a 2.1ft.cu. Very nearly as good (you won't hear the difference probably), in a much smaller enclosure. The low end roll-off will be slightly faster than the flat design, but it's a very good trade for the smaller box.
Date published: 2012-10-05
currently have this speaker in a 3cu ft seald box. Want to purchase another and put in a 4.7 cu ft box seald box will there any noticeable difference
Yeah, If you run sweeps you will notice the difference. The low end extension will start to roll off slightly lower in the larger box. However, in daily use, you probably won't notice much difference. 3 cubic feet gets you about as much as you are going to get out of this sub, at least when sealed. Getting into larger cabinet territory won't gain much performance, but may introduce new problems with baffle step, cabinet ringing, backwave reflection and so on. Not to discourage the larger box, just make sure it is well braced and damped and don't expect a big difference in performance.
Date published: 2012-06-15
Clarifying the formula for downward firing subwoofers.
The formula for the calculations is: Percentage of Sag = 24,849 / ( Xmax * Fs²). However, according to the explanation of sag, two variables (Vas and Sd) are missing from the formula. It says: "You will need the Fs, Vas, Sd (surface area of the cone), and the Xmax to determine the relative long term usefulness of up or down-firing any woofer." If Vas and Sd are needed to determine sag, why aren't they included in the formula?
To find sag you will need to find your Cms then Mms and then Sag.Cms = Vas / (1180 * c^2 * (Sd/10000)^2)Where:c = speed of sound (m/s). Generally 343m/sSd = effective surface arean in square cm (cm^2)Cms (m/N)Mms = 1 / ((2*pi*Fs)^2 * Cms)Where:pi = 3.14159Fs = resonant frequency (Hz)Mms (kg)Sag = Cms * Mms * gWhere:g = accerlation of gravity 9.81m/s^2You sag should not be more than 5% of your XmaxPercent of Sag = (Sag/Xmax) * 100I believe Vas, Sd, and Xmax where all used. However if you look at the spec sheet Cms and Mms are already given (0.21 mm/N and 195.2 g respectively).So Sag = 0.00021*0.1952*9.81 = 0.000402 meters (0.402mm)%Sag = (0.402/14.3)*100 = 2.81% = GTG [Good To Go]!Best of luck and I hope this helps.
Date published: 2013-05-28
What size cap head mounting screw for these drivers?
What is the proper size cap head mounting screw for these drivers? 10-32? 1/4" X 20?
I used 10-32 when mounting mine.
Date published: 2012-02-04
Forced Cancellation Enclosure ?
What size encosure would I need? Using the SA1000. Any help is appreciated.
Search WOOFER SELECTION GUIDE and look for your part number. It will tell you the cubic volume for a sealed box - about 1.5 cubic feet for a - 3db of 40hz. The total Qts is .53. So in an actual living toom - you'll have pretty flat bass down to about 35hz and and it will be critically tight with a Qts of .53. However, .53 has a bit of a rolloff often preferred by audiophiles. For try flat bass and more bass - you want to calculate with .707 To do that - search for a box calculator and plug in the driver specs using .707 for the total Qts. Then you'll have the correct box volume. Don't forget to add space for bracing and the volume the drivers magnet and basket displaces.
Date published: 2013-04-19
How would two RSS315HFA-8 subwoofers work in a sealed 121 liter cabinet?
I have a subwoofer cabinet that I've had for years which I never used due to a change in plans. The cabinet is very sturdily constructed - 1.5-inch walls and 2-inch baffle, has an internal volume of 4.27 cubic-foot and doesn't have any openings cut in it. I've decided to use this cabinet to build the best subwoofer possible for primarily listening to music - mostly jazz and classical and watching some movies, with the only stipulation being that I'm limited to using 12-inch drivers due to the placement of the internal bracing. I've been told that two RSS315HFA-8 subwoofers in a seal alignment would work for this cabinet. However, I noticed that this is the same two drivers that are used in the Dayton Audio RS1202K subwoofer kit, which comes with a 2.1 cubic-foot sealed enclosure - about half the volume of the enclosure that I'm using. Furthermore, WinISD calculated a volume of 194 liters for this design. What am I missing? Does the opposed-firing design of the RS1202K make this smaller volume possible?Also, since I don't want to use a plate amp, what would be a good amp for this subwoofer application? Would a pro amp like one of the Crowns or Behringers be suitable and do any of the pro amps have built-in crossovers? Or should I use a home amp like the Dayton Audio SA1000 for this subwoofer?
The box you have will work very well with two of these in parallel. You would have an f3 of 32 Hz, and an f10 of 20 Hz. Very nice.As far as WinISD suggesting 194 liters, the difference between your box and one of that volume is pretty much non-existent. With sealed boxes you have a great deal of flexibility in volume. The performance difference between the ideal sealed box, and a box of half that volume is often small. Where as a bass reflex enclosure needs to be a certain volume to control what frequency resonances occur at, sealed enclosures place no such demands on the designer.An outboard amp is fine for this, and it helps maintain your enclosure's integrity. The SA1000 is a great choice for this application. Many pro amps include very usable built in crossovers for subwoofers. However, they often do not have phase controls, subsonic filtering, or other niceties you find on dedicated sub amps. I personally would not hesitate to use a pro amplifier for a sub, but I just wanted you to be aware of the limitations. The Crown XLS 1000 would be a good option, in my mind.
Date published: 2013-05-27