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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Don't agree at all posted by Belgarchi on July 12, 2012 at 16:40:24:
Hi,
> The 'Power Response' is irrelevant.
Interesting. Really? So room treatment is a big scam to make people pay ton's of money for stuff they do not need?
> You are not everywhere in the listening room, you are at a
> specific position, hopefully more or less in front of your speakers.
Yes the sound you hear includes all the reflections that the Haas effect integrates with the first arrival...
> Reflected waves are attenuated by the reflection surfaces, and
> walls in the US are semi-transparent to low frequencies.
Most people do not live in the US AND even in the US you find many building that are actually very solid, though typical individual houses are indeed build in ways that raise eyebrows elsewhere...
The only house I ever lived in that had non-solid surfaces for the living room was a victorian semi-detatched house in London, the floor was wood (but only a few feet above solid earth (so quite reflective at LF) and the ceiling was wood too and hence had significant leakage... In all other cases all surfaces have been and are solid.
Arguably one needs to take the room acoustics of the taret room into account when designing speakers, so for example a speaker intended for an individual house build to US code would need a very different LF behaviour to one designed for a Condo in New York or a Flat Berlin or Tokyo.
> Moreover, a large part of the reflected sound is out-of-phase.
Really, would care to substantiate that?
Surely "in phase" and "out of phase" for a given wavelet depends on the time delay. As this varies greatly so will phase, hence the result is hard to predict. Moreover, we do not as such listen to sine-waves. and the human auditory system does not as such operate like a microphone.
There where reasons that in the days when only the Crown TEF (which I had access to) could make near anechoic measurements pink noise was used measurements in room (like when setting up speaker system in a studio).
> The 'Power Response' matters only in a all-concrete small lab, and
> the response at the listener's hears would still be different.
Yet you will find that in most cases that power response dominates the actual frequency response and perceived tonal balance at the listening position.
> The floor is typically a very strong reflector of low frequencies
> (and sometimes of mids and highs also - wood, stone, tiles). When
> out-of-phase, the reflection attenuates the direct sound.
And when in-phase the reflections amplify direct sound. In a solid structure pretty much all LF is reflected back and some will be in- and some out of phase, so with sinewaves we will get a lot of comb filtering.
However as the human hearing integrates sound in the Haas Window regardless of time delay (phase) and simply registers this as increased loudness.
Ciao T
Thor
At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?
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- RE: Don't agree at all - Thorsten 22:12:37 07/12/12 (0)
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