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View Full Version : Tweaks...

glemay
11-23-2003, 05:03 PM
Anybody got any good/cheap tweaks?
Frank Z
11-23-2003, 05:09 PM
http://clubpolk.polkaudio.com/forum/showthread.php?s=&threadid=13521&highlight=tweaks
glemay
11-23-2003, 05:28 PM
How does placing a piece of granite under a subwoofer help? Do you put it under any other speakers?

Gerald Lemay
Frank Z
11-23-2003, 05:46 PM
My HT is built over a crawl space, so the sub caused some reall wicked resonance that I could not tame 1005 using my preamps room resonance filter. Adding the slab helped smoth out the low end room response and allowed for better over all room resonance control.
glemay
11-23-2003, 06:07 PM
I've got my HT in my bedroom which is on the third floor of the house. The flooring is either 1/2" or 5/8" not sure and it is laid on the Slient Flooring Truss System instead of your conventional 2 x 12. I also have a wall running the full lenght of my room underneath me , it is in the center running the full 20'. If it means anything, the entire house has sound proof drywall, and there is no attic, just one heavy 10 ton slate roof.

How would I know for sure if I was getting resonances from the sub?
Early B.
11-23-2003, 06:52 PM
glemay --

Just get yourself a slab and see if it makes a difference.

I took the advice of folks on this forum and bought a slab a few days ago for my sub. I have a carpeted wooden floor over a basement, so I went to Lowe's and paid $4 bucks for an 18" x 18" concrete slab about 1.5 inches thick (it's actually a large paver I stumbled upon in the landscaping section). Came home, spray painted it black, and tucked it under my sub. I got similar results as Frank Z mentioned.

Nice tweak for $4.
Frank Z
11-23-2003, 08:21 PM
Originally posted by glemay
How would I know for sure if I was getting resonances from the sub?

You could invest in a frequecy analyzer. There are also a lot of websites that offer software that perform the same function as a dedicated meter. Another option is to find some low frequency test tones on the WWW and use those in conjunction with your SPL meter to determine your room's response to low frequencies.

My preamp plays low frequency test tones at 70db. All I have to do is set my meter for 70db, play the tones and watch the meter.