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In Reply to: RE: The Subwoofers You Designed Duke Are GREAT !!! posted by ka7niq on December 14, 2009 at 14:53:15
Go ahead and shorten the ports however much you want.
To give you a few data points to go by, trimming both ports to 9" long would tune to about 20Hz; trimming both ports to 4.5" would tune to about 25 Hz; and trimming to 2" would tune to about 30 Hz.
Party on, my friend!
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Follow Ups:
I put the new, shorter ports in there, and bass got boomy and lumpy.
Lost SOME really low bass I had in spades before!
Don't like the conventional tuning, going back to the extended bass shelf tuning you originally designed.
You were right Duke, corner placement of a subwoofer sounds better with the EBS tuning.
Wonder IF I could play with the ports to tune the EBS a little better ?
With the posts you originally designed( the ones about 18 inches long) I get flat bass to 20 hz, and 3 db down at 18 hz
Duke, what parameter are we trying to maximize to get "punchy" dance club and Rap type bass ?
What is the frequency of this chit ?
My subs are both in corners, the room is approx 20 by 24
What about corner gain ?
I only use my subs for watching TV and movies, and now for dancing.
My main speakers do just fine with musical bass.
I really dont want to use a subsonic filter on the woofers, if I can help it ?
I cut the 2 - 3 inch pvc ports to 7 1/2 with a 45 degree angle on ONE end of ports, a "poor mans flare" I learned from YOU!
Honestly, with the longer 18 inch ports in an EBS alignment, low bass was almost scary!
I have over 2000 rms watts to each of the 2 subs, and the low bass is simply staggering, far exceeding 2 SVS Ultra cylinder subs I had previously.
But the upper bass "kick" I am looking for currently is missing, you know, that pounding "club bass" sound ?
Hopefully, by raising the tuning, it will place the bump right where we need it for dance music, and Rap ?
My listening room Duke is an enclosed carport, and has ceramic tile over cement floors, but suspended ceiling tiles.
The bass was so overwhelming, I actually had to "load" the ceiling tiles with thick fiberglass to make them behave!
I know people "poo poo" car stereo drivers Duke, and I am sure there are better drivers then the cadence wild beast 15 inch woofers.
But they work very well, for me.
How are things in beautiful Idaho ?
Oh, I have never been to New Orleans, but I had my first Poor Boy Sandwich and crawfish etoflay recently at the NOLA Cafe, here in Tampa!
The guy from NOLA Cafe is right from new orleans, came to tampa escaping the hurricane!
Man, thats some good food!!
Don't you MISS New Orleans, sometimes ??
The room is a component. So is integrating speakers within a room.
Having read all the above like I shoulda done the first time made me realize my comment is preety dumb. Oh well, I've eaten at NOLA'S and the man's other restaurant in the Warehouse District quite a few times and liked it everytime and didn't know Duke is from there. His last name IS French, tho, I believe. Boy, Idaho is a long way from NO.
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