Speaker Asylum

Posted by Edp (A) on June 22, 2024 at 23:11:46

In Reply to: RE: Need comments on toe up big bookshelf. posted by Tube747 on June 22, 2024 at 16:10:45

The main reason is ( or should be ) to mitigate and in some cases avoid the large and broad cancellation of the upper midrange when the listening axis is above the tweeter.

Simple example, two way tweeter 3 inch above midbass, if you are one inch above the tweeter at 8 foot, that's about 10 to 12 degrees. This will result in a broad 2 db dip in the 1400 to 2500, and a 3 db dip at crossover point of 2200. Be 2 inches above tweeter axis at 8 feet and those numbers grow to 4 db and 6 db. And that's for not too bad of a speaker, just science putting reality to our creations.

One thing to remember is this broad drop out and deep dips do not Happen to those dramatic levels when you go below the listening axis. Far far ( and far ) better to be 4 inches below tweeter axis than 1 inch above.

So by choosing the right combination of height and tilt you can place the listening axis at or below the tweeter axis.

So the why not get the right height stand, mostly it just looks odd for most to see a golden rule box up on 26 inch stands. They look better nestled near the floor and then necessity plus ingenuity put a tilt so the don't sing nice only to the carpet.

But there are downsides to almost every choice of placement. For the rare few designs that implement a crossover alignment together with a physical placement of drivers to achieve a phase and time alignment, well you may negate some of that design. Most other speakers it adds to the already mixed alignments.

It's one of the easiest and reversible changes one can ( most likely should ) do.

Edits: 06/22/24