Building a Subwoofer

[slim2fattycake 85]

like a regular speaker? lol.

[my_first_account 0]

like a regular speaker? lol.

LOL, I know that, but I just wanted to see what the excursion looked like.

Thanks, and funny joke

[///M5 2,833]

Just FYI, that gives you ZERO useful information about the driver.

[my_first_account 0]

Yes, I know that.

I am going to make a box soon, 6.35 cu.ft, sealed at first to see how I like it. What size port and length would be required to have the tune around 17hz while keeping the port velocity under controll? I'm still learning about that...

Thanks for the help

[my_first_account 0]

Oops, I meant that it was going to be a 4 cu.ft. sealed box, and maybe ported later.

Would I need a HPF for running the Shiva at 150 watts? I see that it is within it's excursion limits, but I was just curious...

Also, on my Yamaha anp, it has a "High Cut" knob that goes from 50-150hz. What should I set that at?

Thanks for all of the help so far It's been really helpful

[KU40 173]

that high cut knob actually sounds like a low pass filter. You'll want to set it to 60-70 hz probably. At least I hope it's a low pass filter, because you don't want a high pass filter on that system at that high of a frequency. The only high pass filter you may need is a subsonic filter, but that'll be down at 15 hz, and it won't be a big issue with the sealed box. Ported boxes need subsonics more.

[my_first_account 0]

that high cut knob actually sounds like a low pass filter. You'll want to set it to 60-70 hz probably. At least I hope it's a low pass filter, because you don't want a high pass filter on that system at that high of a frequency. The only high pass filter you may need is a subsonic filter, but that'll be down at 15 hz, and it won't be a big issue with the sealed box. Ported boxes need subsonics more.

Ok. Would there be any way that I could damage the Shiva-X in the 4 cu.ft box with the Yamaha 150w amp?

If I could, I will save up more money, and just get the Reckhorn B-1 as sooon as possible. But, I would still use the sub I would just not play it too loud...

Thanks

[KU40 173]

There is likely a very small possibility of 150 watts damaging it in any way, but sometimes you never know. 4 cubes is pretty big for sealed, I think that's about what they recommend for ported.

[my_first_account 0]

There is likely a very small possibility of 150 watts damaging it in any way, but sometimes you never know. 4 cubes is pretty big for sealed, I think that's about what they recommend for ported.

True. The biggest recommended sealed box that Diycable has on the Application Notes for the Shiva-X is a 3.2 cu.ft with 50 oz. of Poly-Fill. What could I use in substitute for Poly-Fill?

Thanks for the help

Edited May 14, 2009 by my_first_account

[dem beats 1,223]

wall mart pillows have been a trend in many larger HT applications. I would skip the fill though and only add it if you want to change something.

as for 150 watts hurting your sub, probably not, but try to avoid throwing square waves/clipped signals and you will be all good.

[my_first_account 0]

Ok, thanks. If I wanted to stuff the 3.2 cu.ft box, how many pillows should I use?

And I will definitely not do that. I have heard that playing sine signals isn't good at certain levels...I am definitely not going to hurt this sub.

Thanks for the help

Edited May 15, 2009 by my_first_account

[my_first_account 0]

Sorry to double post...

How does this look? Anything that I should change?

And bracing volume:

Thanks and any suggestions are welcome...

[my_first_account 0]

Should I change anything? This is my first time for building a box...I would also like to start the box possibly today, if not tomorrow.

Thanks

[KU40 173]

I thought you were making the 4 cube box? If you may want to port it later, take that into account now. Leave room on the front baffle for the port and leave enough room behind it for the port to extend into the box (this may change your bracing plans).

[my_first_account 0]

I thought you were making the 4 cube box? If you may want to port it later, take that into account now. Leave room on the front baffle for the port and leave enough room behind it for the port to extend into the box (this may change your bracing plans).

I was going for the 4 cu.ft, but I just figured that I would just follow the Shiva-X application notes on Diycable so I know that that design is proved to work.

If I do go ported, would I need to make the two 4 inch ports secured in the bracing?

Thanks

[KU40 173]

You could if you wanted.

If you ported that 3.2 cube box with two 4" ports to 17 hz, the ports would need to be prohibitively long. A new box would need to be built. You may be able to get away with one 4" aero port, however, but that would lower your net volume to 2.7 cubes or so.

[my_first_account 0]

Ok.

Would I need a HPF for the Shiva-X in a 3.2 cu.ft sealed box? It would be running off of the Behringer EP2500 and the Reckhorn B-1...I am still learning on how to model the HPF's right...but I'm learning none the less...

Thanks for all of the help and for understanding that I am a rookie at box building and subs (besides my own )

Edited May 16, 2009 by my_first_account

[KU40 173]

No you shouldn't need a highpass (subsonic) filter for that sub in a sealed box.

[my_first_account 0]

Ok. But I don't need one even though WinISD shows it over its Xmax limits with 750 watts? I just really want to make sure...

Thanks for the help

[my_first_account 0]

How would the Shiva-X in a 6.35 cu.ft ported box with the Behringer EP2500 and the Reckhorn B-1 be able to compare to this subwoofer?

http://www.hsuresearch.com/products/uls15dualdrive.html

I am curious to see if that sub is <actually> worth 2K

Thanks

[my_first_account 0]

Never mind about the last post...my bad

My constant curiosity is going to get me killed...I know it is. It may even be by one of you guys...hopefully not though. I'm just trying to find what would be best for me.

So, here goes...

I had been graphing stuff on WinISD, and just decided to graph the Dayton Titanic MKIII found here

http://www.parts-express.com/pe/show...number=295-420

When I graphed it, I was pretty amazed that it could beat the Shiva-X, but after all, it is a 15" over a 12", and it's $14 more expensive...

So, I was wondering...for the extra $14 over the Shiva-X, should I get this driver instead? I graphed it, and found that it could take more power before it reached its Xmax limits, which I think is a good thing...but I'm still learning...

Also, if I decide to get a second one, I could hit 120db at 20hz with 1000w

Wow...the two Shiva's would be able to hit 117db at 20hz also, but they are about tied below 20hz; that could just be how I modeled them.

For the 2 Dayton's, I had a second order HPF set at 13hz, and for the 2 Shiva's; a third order set at 14hz. The box for the Dayton is 27 cu.ft tuned to 19.05 hz with 4 eight inch ports (there would be two 13.5 cu.ft. boxes with 2 eight inch ports with a overall length of 21.67 in.), and for the Shiva, 14.7 cu.ft box tuned to 17.85 hz (again, two 7.35 cu.ft boxes, with 2 four inch ports at a overall length of 11.47 in.)

I would have to get one driver at a time, wether it be the Shiva or the Dayton, due to money costs...and I could get the second one for Christmas, B-Day, etc...

And, I would get the Behringer EP2500, and the Reckhorn B-1 before I get the second sub...

So, after all of that...

I have my question.

Do YOU think that for the extra $14 dollars (the Dayton has free shipping, and the Shiva would be $205 with tax and shipping)

Personally, I think that the Dayton would be a better choice, but, then again, I don't even know anything about that sub...

I also know that this is way out of my budget, but I had refined it earlier on, and it is around this much, as far as I know...

Thanks. And I apologize for yet another long, boring question, but I want to get the best for my money...

Thanks again

[KU40 173]

Ok. But I don't need one even though WinISD shows it over its Xmax limits with 750 watts? I just really want to make sure...

Thanks for the help

well 750 watts is over the power rating of the sub, 600 watts, so you'd have to be careful of thermal failure at that power as well.

[KU40 173]

I've never heard the Shiva-X, but the Dayton Titanic is a very capable sub. But I question why you put it in such a huge box? I set up a system for a friend with the 12" version and put it in like a 2.5 cube box tuned to 25 or so, and it was great.

Also, DO NOT take winISDs SPL graphs literally. Those graphs do not predict in-home numbers in the slightest.

Third, the port lengths that winISD gives you is for EACH port. so if it says 21.67 inches, each of your two eight inch ports have to be 21.67 inches.

[dem beats 1,223]

I would stick with the Shiva, but again I'm biased. The titanic is a good sub though. I really like the low FS of the Shiva. I think it gives you more a more versatile sub. Then if you really feel the need later you could add another sub, but you would definately be getting some verry low extension.

[///M5 2,833]

While the Titanic is a fine driver, it doesn't make my list at that price point. One of the unusual times when the Dayton stuff isn't a screaming deal.