paulspencer said:What exactly is beaming
paulspencer said:Why does it matter?
HeatMiser said:My impression is that it's a bad thing because the off-axis response will tend to vary with frequency, starting off even and wide and narrowing as frequency rises.
Kuei Yang Wang said:Konnichiwa,
Surely this is a good thing?
It makes sure of two things:
1) With rising frequency the stereo separation improves and any impulses or transients, which tend to dominate imaging, are less distorted by room generated reflections as they are lower in level.
2) The off axis (room) sound will show the typhical "house curve" due to greater rolloff at higher frequencies, failure to do so produce invariably an overly bright sound.
If your speaker does not beam enough you in fact require acoustic room treatment to correct for the problems introduced.
This BTW illustrates the complete and utter idiocy of using wide dispersion high frequency systems (eg. dome tweeters).
HeatMiser said:I'll defer to your greater expertise in the area of speaker/room interactions as to whether the varying reflective nature of listening rooms tends to naturally correct a change in dispersion with frequency.
HeatMiser said:The point it though that it does vary, and particularly in multi-driver systems that fact seems to suggest some design considerations.
Kuei Yang Wang said:This BTW illustrates the complete and utter idiocy of using wide dispersion high frequency systems (eg. dome tweeters).
ShinOBIWAN said:Idiocy? Bit harsh but nevertheless...
ShinOBIWAN said:IMO Room treatment is essential for any repectable hifi system regardless of dispertion.
ShinOBIWAN said:Some like me go steps further and use DRC and EQ.
ShinOBIWAN said:I've used ribbons, dome and current ring radiators for HF, all of the gained from room treatment.
SY said:Without offering my own opinion, it should be said that there are various approaches to "proper" dispersion, all with their own adherents.
AJinFLA said:It's as if no one here has heard of dipoles or waveguides.
Especially suprising given, the very knowledgable posters Shinobiwan & Kuei Yang Wang.
AJinFLA said:The idiocy of using a dome?
AJinFLA said:I would certainly be interested in hearing them.
AJinFLA said:I'll just throw in a pic. to illustrate my attempt at controlled directivity throughout the speakers entire bandwith. Dipole, waveguide, and of course, a idiot Ring radiator, ugly cousin of the dome.
AJinFLA said:I'm from the school of blame the designer, not the parts (domes,etc.) or enclosure type (sealed box,ported,TL,OB,etc).
Kuei Yang Wang said:Konnichiwa,
It should also be noted that, if accurate reproduction of the recording is the goal and if basic acoustics are considered there is only one specific set of set of parameters that achieve this...
Actually I agree with that. The One Way™ is to dispense with speakers entirely and go with binaural recordings and earphones. The fidelity of such a system far surpasses anything that speakers will ever be capable of since all room effects are removed. Indeed, it can be indistinguishable from reality. Of course it's impractical, since recordings must be personalized.SY said:Of course. There's only One Way.