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You will likely have a very easy time bottoming out the Tempest in that massive of a box. I would probably stick with a 250 or 350watt amp just for the added safety.

Seth, his comments on driver design as a general whole were quite entertaining as well :)

Dayton binding posts: http://www.partsexpress.com/pe/showd...ID=14966&DID=7 Another Dayton binding post: http://www.partsexpress.com/pe/showd..._ID=2460&DID=7 Less expensive binding posts: http://www.partsexpress.com/pe/showd..._ID=2479&DID=7

Get him the 15inch Dayton Thruster.' Fs is around 29hz, high sensitivity.... reasonable Xmax. He should get lots of "punch" with it, and it only has a Qtc of 0.9 in a 1.5cf sealed box IIRC.

A room that's 1foot think poured concrete, above ground. Every possible square inch to be used up as a mounting place for uber15's playing as a sealed box (the room becomes the box :D). Each Uber15 with it's own K2 as well :D

Let's read Parts Express's Ordering info (one of the top links at the top of the homepage)

Eric, would you mind if I add your subs to my Dayton sub users archive? LMK and thx :D Rudy P.S. I'll probably end up putting my 12inch MK2 into a ~4.75cf vented box tuned to ~18hz or so. Can't wait to shoehorn it in ;)

I tried my 15inch Dayton DVC (basically a Tempest) in a 1.75cf sealed box (yup, Qtc ~1.0) with ~350watts RMS in my 1986 Pontiac Parisienne, and it was loud... then my amp fried, so I had no chance to evaluate SQ at all :frowning: But what I can tell you is that it was quite loud :D

doh, only up to 12g :frowning: I need something that'll handle up to 8g (my cat5 wire is roguhly 9g :D)

Anybody know where I could find some? TIA, Rudy

www.nuera.ca click on "products" and then "w8-740" That thing should take a buttload of power, and it works in tiny boxes (like 0.5cf :D)

Jack, if it's an active filter, I still don't see how it could change the group delay of the actual driver in the box. I think I'm really missing out on something here...

I'm using a single TB w4-657s (4inch, aluminum cone and phase plug) as a full range surround stick tower. Should work out pretty well. They have a rise in response in treble, but they dont sound harsh, and listening to them in freeair, they dont *need* a tweeter, but as expected, could use...

If you have the space, a quattro of tempests, each in a 4cf sealed box, powered by its own 250watt plate amp, will smoke the velodyne in every category except space-useage. I imagine 120db's in room @ 20hz would be rather easy :)

Anthony, you still can't change the driver natural Qtc-in-a-box, though you obviously can flatten the FR peak around it. You also can't flatten the transient response bump that will occure, but hopefully it'll be high enough so that's avoided during normal use :)

It would run, but I wouldn't want to try running both a speaker level and line level signal into the sub at the same time. Yup you could, but I wouldn't use the amp for tweets, subs and mids only. You'd have to find a way to disable or raise the crossover...

I'd stick with the Tempest, it has a slightly larger Xsus, and will handle more power (thermally).

I noticed you using glue in the first pics while there was still snow on the ground....on all of the glue I buy it says to use it in at least 10-15c or it won't bond properly...?

With that much power you'd go into overexcursion at just 16hz... I think TS2 dips that low doesn't it? I've run my 15inch DVC in a 5.3cf sealed box through a few 0-25hz sweeps with the amp clipping and its still fine.

Tempest sealed or vented shiva. In your case I'd probably go with sealed tempest for awesome SQ.

For home theatre useage I agree, defientely a Tempest or 15inch DVC would be a better chocie, but if you really need the smaller box, my 12inch MK2's great in it's 1.75cf sealed box. The MLS test on my MK2 shows that the Fs is right about 20hz...pretty decent. And yup it's Dumax is 18.9mm

the boost is flatened but the rumble filter is still there, albeit starting aroudn 12hz IIRC.

Check out my DIY cable: Link

I have my 300-794 running open backed in my 15inch DVC's box, and I already modded it twice, no air leak problems at all!

Parts Express BR-1 kit. Comes with premade cabinets, all the XO parts and the XO board, all for $140. I wouldn't even consider building a box with a kit like that available :)

With 140watts you shouldn't be able to bottom it until 15hz in that box. You probably were hearing clipping, same thing happened to me with my 12inch Dayton Titanic MK2 running from the PE 300-794 plate amp. I had a friend run LEAP simulations based off teh drivers MLS measurements, and it...

In a low Q sealed box, stuffing will reduce the amount of bass your sub puts out in the ~30-60hz region, so it may be helpful to some (namely those with small rooms), but it may hurt other's performance.

Putting bends in might actually limit airflow a bit, but not much. I would avoid them if possible though.