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In Reply to: RE: slam = midbass !!!!!!!!!!!!! posted by Norman Bates on December 15, 2009 at 12:52:35
Some good ideas Norman.
I have almost enough "kick" now, for my room, just want to raise box tuning, get a little more.
The Cadence Wild Beast 15 inch drivers have a pretty good amount of X Max, and I have enough power to take them there.
Honestly, even when the room is quivering from 20 hz tones, I still have x max left.
I hear what ya say about kick drums, my old Speaker Lab K corner horns did a great job up there.
I am using a rane electric crossover at 24 db per octave, with two pro sound amps driving the pair of subs.
I already have the new ports cut at 7 1/2 inches, just wait for my kids to come help me flip the subs over, to change the ports.
It MAY very well turn out to be a boom box, and so be it ?
As long as it goes boom where I want it to ?
Follow Ups:
Hmm, changing tuning from 20 to 30hz ?
That won't add slam at all, if anything you may have more sluggish bass.
I know that a 30hz tuning was much better to my ears than a 40hz tuning. Quicker and deeper.
I've never heard a 20hz tuning or lower, so I've no idea.
Slam is also integration with the mids (time alignment stuff).
But running 4 x 15's from 500hz to 80hz, then running 4 x 18's from 80hz to 27hz (6th order tuned boosted subsonic at 27hz), that had massive output (along with 110db 1'x2' mid horn and piezo at 5khz). I hadn't realized how much louder speakers will go by removing those really deep stuff. My current 15's start bouncing at a much lower volume than they should (low freq garbage). My kids said "you know when you told up not to blast the stereo, we didn't realize it was for our protection." lol, that system had slam.
The again, the w-bin I had upstairs had slam, but it also lacked the really low stuff (probably rolled from 150hz to -6db near 60hz then gone), but that was the best kick drum. Watching 5th element, the bullets when the car cars were shooting at Bruce Willis' taxi had impact.
Norman
No Norm, what I have now is an extended bass shelf alignment, box is tuned way down low, below 20 hz.
This gives flat bass to 18 hz, but at the sacrifice of midband punch.
I am now going to tune to about 20 - 24 hz instead.
With an EBS alignment, according to Duke, if I understand him correectly, is extended deep bass that works well with corner/wall placememnt.
The corners/walls fill in the bass roll off from the ebs alignment, making the bass of higher quality.
It worked well, and I can always go back, since I will keep the curent ports.
Now, i am looking for max bass impact for dance music, and so I am going to try a higher box tuning, and a theil alignment, as opposed to an ebs.
The thiel/small alignment gives port gain, the EBS does not.
I THINK that is the way Duke explained it ?
He is the expert here, not me.
Changing tuning from 20hz to 24hz, you would not gain any more slam than you have now.
Norman
I am tuned lower now then 20 hz, I will have to ask Duke ?
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