[Lonely Raven]

I hope nobody is scared of me. I used to kill people for a living but that was long ago and I've yet to actually kill a customer. There are one or two I can think of who have tempted me but I'm old fat and slow and I'd have to catch them first.

In terms of subwoofers, I don't take any of this personal. For me, it is just a way to make a living. There are tradeoffs no matter what you do so it is just a matter of fitting the right shoe to the right foot.

Kevin Haskins
Exodus Audio

I don't know...I almost had a heart attack pulling the Maelstrom 21" out of the box to install it in my baffle. Does that count? :bigsmile:

I suggest you aim for SQ in this battle. I'm willing to bet the maelstrom has the edge in this one. 138 db is like 150 in room. Which is insane.

I will probabaly be facing a similar decision come this spring when I finally get myseld psyched up enought to start my basement HT build...

I do like the idea of the 21" Maelstrom so that I can be sure to have the biggest one on the block!

I just finished my Maelstrom 21" sealed build. It's not painted yet, but it's been working in the living room theater for almost two weeks now. I took some quick measurements that I will redo simply because they look too good to be true. The build is about 16cu ft sealed, stuffed with pillows, and powered by an EP2500.

This is a 5-200Hz sweep with a calibrated soundcard and Behringer mic with the downloaded calibration file. REW was calibrated at 75db with the built in pink noise.

I'll be taking some more measurements this week.

 

[Lonely Raven]

I asked you in my build thread to explain to me how to do it, and I'd see what I could do.

I'm not familiar with all the different types of measurement.

In my thread, I think I've proved these measurements are as accurate as I can do with the equipment I have. I re-measured everything at the cone, and at seating position, and it came up pretty close.

So how do I do a ground plane measurement?

 

[Lonely Raven]

Basically if you have a flat patch of land. you lay a microphone at 2m in front of the sub on an open area of ground.

The difficulty is getting a quiet enough area to do the measurements. I didn't see your other post so please forgive the miss. :whistling: Illka does this type of measurement sometimes.

http://www.audioholics.com/education/loudspeaker-basics/subwoofer-measurements/page-2

shows how to setup a ground plane test if interested. :T

I'm not doubting your data just interested in seeing how it would compare to some of the other beasts.

Ok, I've seen his measurements.

I'd have to figure out how to make my setup portable, and I'd have to be able to fit the box in my car...it's cutting it kinda close. Plus I'd need to find a parking lot that happens to have a power outlet I can borrow.

Being winter, I'm doubting I'll get this done anytime soon...sorry.