AudioRoundTable.com - RDF feed
type: channel
description: Audio advice and discussions with audiophiles and professionals. Free discussion forums, open to all and frequented by industry experts. Ask questions and get advice on stereos, speakers, hi-end amplifiers, pre-amps, home theater, tube hi-fi, turntables, vinyl, tweaks, music, films, video, DVDs and more.
items: Compression Horn Lesnses
items: Re: Compression Horn Lenses

Compression Horn Lesnses
type: item
description: I noticed the Eminence 290 has a smooth flare while the 295 has a discrete angle in the flare. How do these differences effect the sound? Is one generally preferred for home audio? Eminence Horn Lenses
creator: FredT
date: 2005-05-13T10:15:36-00:00

Re: Compression Horn Lenses
type: item
description: You can model the response of each of these horns in Hornresp and see their on-axis response. That will give you some idea of what kind of sound to expect from them. It's a pretty useful program to have too. I've found that small horns tend to be a little more flat when the flare expands rather than having straight walls, but if you can make 'em really big, the conical flare works very well. The extra expansion near the mouth of a straight walled horn is for directivity. If the horn were very large, then the radiation angle would be set by the flare. But as frequency drops, wavelengths get long and at some point, the flare isn't acting as a directional device any longer. In fact, there is a transition region where the mouth acts like a diffraction slot. And when it does, the pattern doesn't neatly transition from the wall angle to omnidirectional; Instead, it forms a pattern like this: You'll notice that intensity is high in the center, then dips before another peak. The widening near the mouth helps increase energy in the dead spot, making the pattern a little better at the low end where it loses pattern control.
creator: Wayne Parham
date: 2005-05-13T22:55:01-00:00