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In Reply to: RE: I concur (changing low pass setting) posted by John Elison on July 05, 2012 at 09:45:52
55Hz for the low pass? That seems really low to me. Is that typical? I thought 80Hz was a good point in general. Recharging my CD player battery. I'll be experimenting with the cross over point on Saturday.
Follow Ups:
While it's true that below about 80 Hz, we lose a significant ability to detect the source direction of a sound, it's important to remember that a sub doesn't get "chopped off" at the crossover frequency, AND that our subjective impression of good bass (or "punch" or "thump") is enhanced by the boosting of frequencies in the range of about 100 Hz to 200 Hz.
As I'm not familiar with the particular sub you have, I'll just offer that, if you're crossing it at 80 Hz, you may still be getting noticeable output above 100 Hz, contributing to the localization that you mentioned. I would agree with another poster (sorry I can't see the post at the moment) that crossing much lower, such as 55 Hz, may be beneficial. Alternatively, if you need to cross higher due to limitations of the main pair, in the 80 Hz range, two subs (left and right) may be in your future.
80 is too high. It's a thumb rule for hometheatre and nothing more. How low can your speakers go? Surely lower than 80.
Every subwoofer integration I do here uses 24db/octave lowpass for the sub and a crossover frequency from 50-65hz depending on which speakers I am using the sub with. The 65 hertz situation is with a sealed box design with 7" midbass drivers. The 50Hz situation is with a ported design using nominal sized 8" "midwoofs".
Unless you're running 5" high-Fs drivers in a sealed box there would be no need to cross over so high.
The NHT may also have 2nd order (12db/octave) slopes, making it very hard to elminate localization if crossed over above 55 or 60Hz.
80Hz with a 2nd order is almost always locatable IME. 80hz with 4th order is bad enough... I like 4th order, 65 MAX.
I don't own a speaker that requires a higher crossover point and except for home theatre I don't recommend that one does! ;)
Cheers,
Presto
The NHT Classic 3 has what they call a 6.5" woofer with a very long throw. Specs say it goes down to 45 Hz.
Given the constructive insight, I will be trying much lower points below my initial setting of 80 Hz.
For those reading this, I'm going to try to complete this exercise by Sunday and do a posting. If you don't see a posting from me by than it is because I'll be in and out of town for the next two weeks.
Thanks everyone for their input.
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