On the vertical access, you would most likely toe them in toward the center to minimize the side wall reflections that toe out would give you...
Speaker Height / Tilt
What are the benefits / drawbacks of putting speakers on shorter stands and tilting the speaker up? Do you run into phase and time alignment issues when tilting speakers?
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I’m not understanding how a dome tweeter is directional... I have a d’appolito designed speaker. How does that change things. But seriously, how does a dome tweeter radiate sound below its axis vs above its axis? Am I misunderstanding you? I would think that a dome tweeter radiates sound uniformly top to bottom, side to side... And if its okay to sit below the tweeter and not above, can you fix that by turning the speaker upside down? Last, if its not good to sit above the tweeters axis, why are manufacturers making shorter floor standing speakers with tweeters below a listeners ear level? |
Measurable output decreases off-axis. Just look at any of the Atkinson measurements of speakers in Stereophile. Because of numerous variables, each model will differ in how a tweeter output decreases. Also, some speakers are actually designed to be listened to off-axis (e.g. pointed straight ahead, rather than toed in). Stand height and rake are other variables. Just look at the instructions for setting up Vandersteens correctly. |
So, here is the evidence tweeters are in fact directional. From the spec sheet of a typical tweeter: https://www.madisoundspeakerstore.com/soft-dome-tweeters-vifa/peerless-dx25bg60-04-1-textile-dome-tw... Notice the frequency response chart. Each line represents a different location off axis. Next, please refer back to the measurements I pointed from Stereophile. What happens is that the relative difference in distance to your ears causes constructive and destructive interference. Speaker designers (like me) have to take the acoustic distance into account when designing crossovers. D'Appolito is the exception in that above and below the tweeter axis is the same. As I tried to mention above, my comments about listening at or below the tweeter axis applies only to traditional designs with the tweeter on top. With D'Appolitos it's the same amount of pain, and sometimes more so, below and above. After he initially introduced his famous configuration, Dr. D'Appolito has suggested fixing this by increasing the steepness of the filters if you use his design. That is, if you'd normally do OK with a 2nd order (12 db/Octave) you should try a 4th order (24 db/Octave). |
- 14 posts total