Originally Posted by 4DHD
I have a problem with #3. No matter how a speaker is designed it should not be recessed into a hole. Such as a cabinet or a set back in a wall. Even in-wall speakers are flush. There is nothing good to say about early reflections off near field objects.
Depends on your definition of cabinet. At one point there was discussion on moving the speaker out to the edge of a glass shelf or putting absorbent material under it. Then it became putting it forward of any cabinet edges, which is a logical progression when a cabinet or shelf may only have a physical boundary at the bottom of the speaker.
So it could be a nice TV stand with shelves or a cabinet with sides, shelves, and a top. In either case, it's possible to put a speaker on the top shelf of a stand or the top of a cabinet and only have to be concerned about reflections off one surface and one edge. It's not limited to only placing placing a speaker "into a hole." That's putting something into my statement that's not there.
Consider a PS1400 cabinet and a PT800 cabinet. When stacked, the PT800 is deliberately placed behind the PS1400 cabinet's edge by a few inches. This is done for time alignment purposes. It seems to break the rule, but of course it's mitigated somewhat by the elevation given the PT800 by the stacking pillars. It's further mitigated by the fact that the 8" Ti inverted dome driver is not putting out any significant HF or MF sound, both of which are more likely to rebound off a hard, flat, close surface due to the shorter wavelengths.
Consider my personal Performance Series 5.1 system with four PS1400/PT800 stacks and a single PT800 for a center. House rules dictate that there must be a table where the center speaker needs to go, and that table's flat, wooden surface extends 24 inches perpendicular to the face of the speaker's baffle. Further, house rules again dictate that nothing shall cover any significant portion of the beautiful wooden table top so all can see and admire it.
Well, good fortune shines, because the FL and FR mains also dictate that the center needs to be raised five inches above the table's surface to place the tweeter and midrange drivers at the same height. With the 8" woofer at the bottom, it's a long way to the tweeter and mid from the table top, and measurements with and without batting on the table's surface (when the house rules are suspended because I'm home alone) shows not even a 0.5 dB rise at any frequency due to this placement so far behind.
Consider the Synthesis® S4Ai surrounds I've got downstairs. They are in-walls, and the cabinets are indeed flush with the walls, but four of the six drivers are inset into the cabinet by 1-2" and angled at 45 degrees, thus "recessed into a hole," albeit a shallow one. In this case, the purpose is to redirect sound and make it more diffuse.
All I'm saying, guys, is that absolute statements are easy to make but tricky to defend, and it's easy for people to take them too much to heart when context might in fact require a different approach.
And the next time I do the same thing, I expect to be called on it (in as nice a way as possible), and I'll be happy to confess my guilt (for the umpteenth time).