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In Reply to: RE: I took the plunge & ordered a sub. Where is RBNG ? posted by rocky raccoon on April 17, 2008 at 11:39:50
Now, questions:
"If a sub is taking care of , say, 15 - 40 Hz then does it make sense to push the resonant frequency of the enclosure up (with bracing) rather than down (with mass (like doubling the cabinet walls) ?"
RG:
Look for 1" thick MDF or Marine Plywood. Use many sturdy braces. If you want to be Mr. Smarty Pants build a dual wall enclosure with sand loaded between the layers. Then get a hand truck to move it. It really makes sense to use a lightweight cardboard tube, which requires no bracing at all, or a cement sewer pipe you stole from a local construction site, to save money that should be spent for a digital parametric EQ.
You could use 2 x 4's for interior bracing and add mass too, as I did for one DIY subwoofer, but don't try to move the box often.
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"Position-wise with just one sub (for now....) should I start with it in the corner and work out ? Does anyone have advice (RBNG!) on how to proceed ? It's quality we're aiming for here and 'aesthetics' are not an issue."
RG
One 12" subwoofer is not much displacement for a typical room and will be considerably more difficult to integrate with two speakers than two subwoofers. I use two 12" drivers in my cheap 13' by 12' bedroom system!
A subwoofer placed in the corner of a rectangular room will have the roughest possible frequency response because it will fully excite all room resonances. In addition, integration with the main speakers, which I assume are not located near the corners, would be a potential problem.
With only one subwoofer, start experimenting with the sub located between the two speakers. The biggest frequency response problems would be if you sit half way between the side walls and the subwoofer is also located halfway between the side walls. Placing ears and speakers/subwoofer even one foot off the room's 'centerline' can make an audible difference.
You can also try the sub right next to your seat if it is set up to have minimal output over 50Hz. (such as using a 50Hz. 24dB/octave low pass filter)
The Telarc 1812 will be quite a challenge for one 12" driver and I wouldn't play it real loud if that was one 12" ported driver.
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Richard BassNut Greene
"My stereo sounds better than your stereo, because I say so, that's why!"
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