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Need help [message #19547]

Tue, 15 July 2008 23:37

SteveBrown
Messages: 330
Registered: May 2009

Grand Master

Okay, I need help, here's the deal. I'm in a new house and have to figure out my speakers once again. I have too many options, too many speakers and too many amps. But... my main setup is this: JBL 2226 in a 3.5' vented box (2 x 3" ports, about 6" long. One sound absorbing panel behind speaker and one vent at least mostly plugged w/a wash cloth (which my wife wants back at some point), and on top an Edgar horn with a GPA 902 driver. The crossover is from Spekerman57 and, I think 1600 hz. the woofer is 16 ohms and the tweeter is 8. In my room I'm getting harsh sounding piano, especially around 900 to 1200 or a bit higher? hz. The bass is pretty good, boomy with some amps, but generally better than I thought. The room has a deep window seat between the speakers (7' wide and 4' deep), and the sound stage is compressed in the middle. Overall the room is about 15' wide and 18' deep. Any thoughts on getting the harsh notes under control? Is it room treatment or crossover? Ron could chime in about crossover components if he sees this. As an alternative, I've tried a 1k crossover with open baffle on top, crossover is 1st order both top and bottom, top speakers are Fostex FE167E's (97db same as woofer). The top has to be padded down a bit (due to 3db gain in OB and 16 ohm JBLs). This gives a better sound stage, but still a bit harsh. I could switch it all around and put the speakers on the long wall, and my listening position up against the back wall, but not sure if that would help (though it would get rid of the window seat).

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Re: Need help [message #19548 is a reply to message #19547]

Wed, 16 July 2008 14:34

Wayne Parham
Messages: 18783
Registered: January 2001

Illuminati (33rd Degree)

Let's get together soon, maybe this weekend or the one after that.

There are two things I can offer as a suggestion. One, we can measure your speakers with LMS and/or the Smith & Larson system to see what's happening. Two, we can put my four π's in place and A/B them against yours. Your speakers and mine are similar except tweeters. Mine has uniform directivity and yours has collapsing directivity, so we can see what difference that makes in your house. The differences should be most pronounced between 1kHz and 3kHz and then again above 5kHz.

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Re: Need help [message #19549 is a reply to message #19548]

Wed, 16 July 2008 15:31

SteveBrown
Messages: 330
Registered: May 2009

Grand Master

Wayne, sounds like a good plan. I'm open either day of either weekend. Just let me know what works for you. Thanks!

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Re: Need help [message #19550 is a reply to message #19549]

Wed, 16 July 2008 17:25

Wayne Parham
Messages: 18783
Registered: January 2001

Illuminati (33rd Degree)

I'll talk with Melissa this evening and make arrangements with you.

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Suspended floor is not helping either! [message #19553 is a reply to message #19550]

Thu, 17 July 2008 13:10

spkrman57
Messages: 522
Registered: May 2009

Illuminati (1st Degree)

You need to damp the speakers to the floor with some weight to take some extraneous output from causing interference with the original sound emanating from the speakers.

I think when Wayne stops over he can let you know of crossover rebuilds to help out also!

Ron

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