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Hmmm, I never noticed that! And I've still heard some bottoming out on Tchaikovsky's cannons (Telarc's disc)! Those default values only correspond to a 1dB boost between 25-30Hz, but I might change the resistors to move it to 20-24Hz and put the cutoff at 13.9Hz. I wonder what the rolloff on the...

I'm using the Bash 300S Digital Subwoofer amplifier with a Dayton DVD in a Tempest alignment. It's about the same price as the Dayton 250w at $129, although it lacks a subsonic filter (which was a selling point for me). Great amp, runs cool all day.

16ohms in series it is then. Better to be safe than sorry. I'm glad to hear that the IB15's aren't a mistake. They're cost efficient, for sure. With this much power, it makes me wonder what two sets of 4 manifolded drivers would sound like. *evil laugh*

The amp I recommended for this install was the Behringer EP2500. It's way, way more power than is needed, but costs about the same as a plate amp. We were also very concerned about the temperatures in a deep south attic for 9 months of the year and so wanted a rack mount amp we could mount...

Well, he ended up going with four Dayton IB385, because of their high mechanical damping designed just for IB situations. Plus, they were only $95/ea. Dayton IB385-8 15" IB Subwoofer What are the RS15's you're referring to? The Dayton Reference series? They're $139 at PE, anyone else got...

Four 15" subs are pretty much what is recommended for this room, anyway (3600ft^3), but I don't know if that's quite the budget this guy was after. It's already at ~$650, plus materials, with the two 15" Titanics and an EP1500. Might be a good idea to do what you said and use only one channel...

I suppose that there is no denying this amp is overkill, but we are now heavily leaning towards a 2x15" manifold IB setup (thanks for the site, Ryan!), so it won't be quite so overkill. The EP series does have a 30Hz inrasonic filter, but I suppose that's useless with a low-freq driver like the...

Thanks for the affirmation on the powered long cable runs. As for the power level - yep, it's overkill. But it's a big room and I wanted to make sure this guy had plenty of power for the 2nd sub I'm sure he will eventually want. Ryan was apparently reading my mind when I was thinking of doing...

I'm designing an attic-mounted big subwoofer (Dayton Titanic in ~Adire Alignment). I'm hesitant to put an amp in the blistering heat of a South Mississippi attic, so I've thought about an in-room, rack-mount solution like the Behringer EuroPower series. Has anyone run long lengths of 1500...

I don't doubt that the box looks and feels like a monster! But with a Vas of 9.9 cu ft, your 3 cu ft box is sort of scratching the surface of what that driver could really do. Don't sweat it, though. You could double your output (+3dB) at 20Hz with a box that was twice as big, but if your...

Download a program like WinISD and experiment with various alignments. That 18x18x18 box is a little small for that driver, actually. But it's probably worth giving it a try since you've got it built. Running it sealed would give you an F3 around 43Hz and put you down -14.6dB at 20Hz. You'd...

Ok, I think I understand now. You're basically looking for the surface area of a cylinder around the perimeter of the effective cone area. Otherwise, the air coming from the cone face would have to compress before exiting the openings underneath the enclosure. Turns out not to be too big a...

Am I missing something? What are you calculating when you are dividing the Sd by the circumference (749/97)? Geometry class must have been a long time ago because I'm not seeing it. Seems like Sd/C simply equals 0.5R I'm asking because I'm building a downfiring sub and the only criteria I've...