I find your measurements or speaker away to big.
And ports to small in length.
Let's say you have a big enclosure, let's consider a 350L= 12.36ft³ then alignment:
350L@14Hz with F3-16 Hz (in room 12.5 Hz) for 2P flared diam=4" you will need 63.51cm= 25" in lenght.
Now add some vol for ports, drivers and other parts:
5.5L for each port = 11L
Driver 15 inch - 4.0 liters
You end-up with Total Volume of 365L (350+11+4) internal.
If you shave about 8" from the 60" you end up in the ball park.
Volume Calculator
A box shape that has dimensions 18 inches by 24 inches by 52 inches has a volume of:
= 13 cubic feet
= 368.12 liters
Attachments
Last edited:
Snappyturtle,
I was just told in the Parts Express Tech Talk Forum that the mouth of the slot port would have to be the same area as the two 4" ports combined, or about 25 square inches. Then the same 17" length ( for the slot port ) could be used to get 17Hz ....Or i could add the 2" to get a length of 19" ....and acheive the 15.8Hz
So a slot port mouth of 2" x 12.5" would equal 25"
You had said 1.5" x 8" ..How'd you get that ? that only gives an sq in area (for the mouth ) of 12" !
This box ( for the Dayton DVC385-88 ) will have the two 4" flared tubular ports.
But thinking about doing a second enclosure with a slot port ....For the Dayton RSS390HF-4
A slot port 2" tall, 12.5" wide and 21" long. ....to acheive 15.8Hz for that sub ( RSS390HF-4 )
Here's me and the EBS Box
A side view
Far away view
I don't see any internal bracing, if you run that subwoofer to it's full power capability without any, that cabinet might not live very long.
Mike
Since in practice you don't have frequencies lower than 14/15Hz you should be fine with the 19" ports.
350L@16Hz
4.25L for each port = 8.5L
Driver 15 inch - 4.0 liters
Total Volume of 362.5L (350+8.5+4) internal.
Shave about 9" from the 60" side, more/less if you need bracing.
A box shape that has dimensions 18 inches by 24 inches by 51 inches has a volume of:
= 12.75 cubic feet
= 361.04 liters
Have fun.
350L@16Hz
4.25L for each port = 8.5L
Driver 15 inch - 4.0 liters
Total Volume of 362.5L (350+8.5+4) internal.
Shave about 9" from the 60" side, more/less if you need bracing.
A box shape that has dimensions 18 inches by 24 inches by 51 inches has a volume of:
= 12.75 cubic feet
= 361.04 liters
Have fun.
Attachments
@ Zobsky
Thanks! But indeed HO & HF are quite different with HF requiring higher Volumes.
Thanks Inductor ! I have the Drivers arriving Mid Jan. 18" x 24" x 51" Box it is.
Jayant
Thanks! But indeed HO & HF are quite different with HF requiring higher Volumes.
Since in practice you don't have frequencies lower than 14/15Hz you should be fine with the 19" ports.
350L@16Hz
4.25L for each port = 8.5L
Driver 15 inch - 4.0 liters
Total Volume of 362.5L (350+8.5+4) internal.
Shave about 9" from the 60" side, more/less if you need bracing.
A box shape that has dimensions 18 inches by 24 inches by 51 inches has a volume of:
= 12.75 cubic feet
= 361.04 liters
Have fun.
Thanks Inductor ! I have the Drivers arriving Mid Jan. 18" x 24" x 51" Box it is.
Jayant
Also to increase the volume for speaker bracing. Mike was very opportune to remember us. I mention this constantly so that net volume and alignment is about the same as that given by the software.
Apologies for posting about the wrong driver.
From what I remeber when I researched the drivers, the HF had a lighter cone and somewhat higher Qts (and maybe Vas too, but I'm too busy/ lazy/ tired to look it up at the moment) and from my sims , needed a somewhat larger ported box or else a sealed box with boost to work well. That's why I picked the HO version.
If you dare, there's the option of building a THT for the HF driver. That's probably close to the "BEST" option for it , if you can live with the size
From what I remeber when I researched the drivers, the HF had a lighter cone and somewhat higher Qts (and maybe Vas too, but I'm too busy/ lazy/ tired to look it up at the moment) and from my sims , needed a somewhat larger ported box or else a sealed box with boost to work well. That's why I picked the HO version.
If you dare, there's the option of building a THT for the HF driver. That's probably close to the "BEST" option for it , if you can live with the size
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Hi zob,
Yes, 60 liters more...
I new where you were coming from.😀
name, diam (cm), imped, Fs (Hz), Vas (L), Qts Xmax (mm), Sensitivity dB/2.83V/m and Mms
DAYTON RSS390HF-4 v2014 (Discontinued by Manufacturer), 38, 4 Ohms, 18.00, 281.80 0.423, ± 14.0, 91.1, 269.253 g
DAYTON RSS390HF-4 v2015, 38, 4 Ohms, 19.50, 212.00, 0.429, ± 14.0, 91.2, 304.959 g
Regards.
If I remember, the HF was great for 5.5ft3 sealed with f3 around 30hz.
I think f8 was around 20hz with 200 watts hitting xmax at 102db.
I want to try 2 of then in a ppsl 11ft3 sealed for 108db @20hz.
The ho was good for 4th order around 25hz tuning in a smaller box (if I remember).
Then again, you deep tuners ideally can do big box tuning under 20hz with the hf.
But 27hz max excursion would be limiting when tuning under 20hz.
I think f8 was around 20hz with 200 watts hitting xmax at 102db.
I want to try 2 of then in a ppsl 11ft3 sealed for 108db @20hz.
The ho was good for 4th order around 25hz tuning in a smaller box (if I remember).
Then again, you deep tuners ideally can do big box tuning under 20hz with the hf.
But 27hz max excursion would be limiting when tuning under 20hz.
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