Sonotube Sub questions

[Johnny5]

First off I'm new here to the forum. And I've become interested in making a DIY Sonotube sub. I get the concept of how the sub is built but I have a few questions about a couple of things mainly how to get a correct volume for the tube. I've punched some numbers into a few different programs WinIsd Beta and the Pro Alpha, and Unibox but I'm not really sure what volume of tube I need. I was shooting to find possibly a 24" wide tube to eliminate the height of the tube . The driver I'm interested in using is the DAYTON RSS390HF-4 15" HIGH FIDELITY from PE. The T/S parameters are Specifications: *Power handling: 500 watts RMS/800 watts max *VCdia: 2-1/2" *Le: 1.00 mH *Impedance: 4 ohms *Re: 3.3 ohms *Frequency range: 18 - 800 Hz *Fs: 18 Hz *Magnet weight: 150 oz. *SPL: 90 dB 2.83 V/1m *Vas: 9.55 cu. ft. *Qms: 3.10 *Qes: .49 *Qts: .42 *Xmax: 14mm *Dimensions: A: 15-5/16", B: 14-1/8", C: 6-1/8".

According to WinIsd Beta to tune the box to 17 Hz I need a volume of 18850.2 cubic inches or 308.9 l's with a 6" port 18.5" long

According to WinIsd Alpha to get 17 Hz I need a volume of 648.4 l's with a 6" port and 7.07" long.

I might be punching in some numbers wrong. Thats one of the reasons that I came here because I've been reading a lot of the DIY threads and seen the knowledge that is being shared on the forums and figured this is the place I need to be.

And the second question is what power from an amp should I go for? I was thinking about using a power amp instead of a plate amp. I didn't know if I should match up the power to the RMS value or the Peak Power handling value. I plan on starting the project early summer maybe late spring, right now I am just doing some planning ahead so i know what to expect material wise when I go out and start my project. Thanks in advance for your input and advice
John

[Gir]

I'll be building a sonosub in the coming months with the exact same driver. I'm going to use a 410 liter enclosure and tune it to ~13hz. For a 17hz tune you should be fine with around 300 liter. With WinISD just play around with the volume size and tuning point and see how it changes the graph.

[ThomasW]

Sorry to say but PE doesn't not recommend horizontal mounting for the RSS390HF

This is a good driver if you want something downfiring

http://www.tcsounds.com/tc1000.htm

Delete WinISD beta from your PC because it's not accurate. WinISD pro or Unibox (recommended) are accurate.

There's nothing gained by using a 6" port with a modest excursion 12" driver, a 4" flared port will work fine.

[Johnny5]

Thanks for the quick response's. Thanks Thomas for saving me from a potential problem with mounting the driver horizontally. When figuring out the volume do i have to add in for the space that the port is taking up or does that matter at all?

[WillyD]

What Thomas said...and the 15" TC-1000 will be released in the next 5-7 days.

You must take the volume taken up by the port into consideration, yes.