Critic's Corner

RE: Alta Audio Adam

174.118.198.241

Pat D

In Reply to: RE: Alta Audio Adam posted by tomservo on February 11, 2023 at 09:28:07

How do you place such a speaker to minimize the floor effect? Put it close to the side walls?

Today, I found the Stereophile review and measurements on line. The measurements don't look so pretty but they aren't all that bad.
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"A fool and his money are soon parted." --- Thomas Tusser

Follow Ups:

RE: Alta Audio Adam - geoffkait 06:04:01 03/04/23 (0)
The frequency response changes according to how close the speaker is to room boundaries. Allison speakers of course and perhaps others were designed to be placed in room corners. But others like say Rogers and Quad really had to be placed well away from walks and the floor to sound their very best. As with many things in audioland there are way too many variables involved, like speaker placement, vibration issues, room acoustics anomalies, to be able to generalize too much. When you walk into a room at CES people often assume the sound they hear is primarily due to speakers.
I shall refrain from giving the equation relating frequency response to distance from room boundaries.

Edits: 03/04/23 03/04/23
RE: Alta Audio Adam - tomservo 11:12:54 03/02/23 (1)
Hi
So picture the speaker and you at the measurement position.
There is path length one, from the woofer to the microphone or you AND there is path length two which is the path from the woofer to the floor around half way between you and the floor to the microphone or you.

When the second path is about 1/2 wavelength longer / behind the direct path, the two sounds partially cancel each other out producing a notch in the frequency response where that happens. (or at least that is what this typically looks like)

So, if one reduced the difference in the two paths by lowering either the woofer or microphone position above the floor, one would find the notch goes up in Frequency.
So for a woofer, a couple steps further, one would put it no higher off the floor than having that notch, ABOVE the the woofer low pass frequency and out of the way of the bass response (so far as that strong effect).
Hope that makes sense
Tom
- RE: Alta Audio Adam - Pat D 10:37:35 04/17/23 (0)
  How significant is the floor bounce? As you say, it would occur with a lot of speakers. It would also occur with natural sounds such as speech and live music, too. So we are used to floor reflections.
  
  Dr. Floyd Toole discusses this briefly in his book, Sound Reproduction, 3rd ed, Section 7.4.7, p. 193.
  -----
  "A fool and his money are soon parted." --- Thomas Tusser

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