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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Re: PPSL posted by bmar on May 16, 2003 at 19:26:45:
"Is the equal and oposite reaction limited to 2nd harmonics, and does it make the system less efficient"Yes, the equal and opposite reaction only reduces 2nd harmonics, it does not change the system efficency.
"With the drivers close together like this. Just how high can this system be used."
The closer the better seems to be the rule as far as HF response goes. A four 12 box I made could be crossed at 400hz, some dual 18 boxes were able to cross at 250hz. The majority that I have built are dual 15 and crossed far enough below where the plenum rolls off to use an off-the-shelf LR4 crossover.
"What kind of parameters do you use when calculating the rear chamber"
Use normal TS parameters and size like a regular box, I use low Qts drivers with a step-down tuning and equalization. Drivers with Qts=.312 give the deepest bass response from the smallest box size. Alternately one can seal the box and use a Linkwitz transform, or leave the back open like the Linkwitz dipole.
"and can you actually build the box so it would act like a low pass filter down to 80hz if needed."
Yes you can, but now you have a bandpass box. That may better suit your needs, and many modeling programs are available for those.
At the time I was looking at both the EV MTL4 and the KEF 104, both had their strengths and their weaknesses. My design had all their strengths and none of their weaknesses.
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