Re: 1pi or 2pi for surrounds? [message #69500 is a reply to message #69499] |
Thu, 15 September 2011 12:35 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18758 Registered: January 2001
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Illuminati (33rd Degree) |
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For home hifi and home theater, I like running the mains and surrounds full range because of the benefits in the modal region. Blending multiple sound sources smoothes the room modes.
If you were running in a prosound environment, it would be a different story. I wouldn't suggest running mains full range. In that application, you always high-pass the mains where systems are pushed hard, to limit excursion.
Or if you had little bitty mini-monitors using drivers that could easily be overdriven. In that case, you'd want to high-pass them too.
But this just isn't the case for speakers like these used in a home theater. These are efficient speakers designed for high-power use, and you have several of them. The mains carry most of the load, as do the subs. The surrounds don't really do all that much. Even in the occasional full pan to a surround channel, we're still not pushing these too hard. As long as you keep the power below 100 watts, they're fine.
On the other hand, if you have the capability to high-pass at the Helmholtz frequency, that would be a good thing to do. It will limit signals where the woofer is unloaded, and isn't making any sound anyway. But if it isn't possible, don't sweat it. These speakers handle a lot of power, and are efficient enough that they produce a lot of sound. You can easily get over 110dB/M from them, which is plenty for surrounds.
So with all that said, I do not suggest using high-pass - at least not above the Helmholtz frequency - with these speakers. Very little is gained in a home hifi or home theater environment. The benefits of reduced IMD (from high-pass) are far outweighed by the benefits of modal smoothing (by not using high-pass) in this application.
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Re: 1pi or 2pi for surrounds? [message #69512 is a reply to message #69511] |
Fri, 16 September 2011 19:30 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18758 Registered: January 2001
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Illuminati (33rd Degree) |
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Good to know the system chose a setting that made sense for the surrounds. I'd run the mains with high-pass at their Helmholtz frequency also, or just run them flat out. If you high-pass the mains, make it pretty low like 30Hz or 40Hz, wherever the Helmholtz frequency is.
The main thing is, we just don't want to rolloff the mains early. We want as many sound sources as possible playing in the room's modal region. Same thing for the surrounds, but with a different goal in mind. We're not looking to them for modal smoothing, since they play such different content. But we do need them to have similar spectral balance, and they need to be able to stand on their own, for the most part. They don't need to be capable of real deep bass - that's covered by the subs, which is non-localizable. But we do need them to run competently down to 60Hz or so.
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