I am at the stage where I need to figure out my first reflection points. I know I use a mirror from each seating position to each front speaker. But where do I line it up, only on the tweeter? Meaning I am just looking for the tweeter in the mirror? I have towers up front so I assume I do not need tratments onthe wall the same height as the speakers, correct?

I am at the stage where I need to figure out my first reflection points. I know I use a mirror from each seating position to each front speaker. But where do I line it up, only on the tweeter? Meaning I am just looking for the tweeter in the mirror? I have towers up front so I assume I do not need tratments onthe wall the same height as the speakers, correct?
Depends on the frequency range of the other drivers in your towers. In general, you should use the mirror points of every mid to high frequency driver.

- Terry

Are woofers (6.5") considered mif-frequency drivers? I assume they are. Man that makes for a lot of reflection points!!

Are woofers (6.5") considered mif-frequency drivers? I assume they are. Man that makes for a lot of reflection points!!
Look at the specs of your speaker to see what range these drivers cover. If they reach into the few kHz (highly probable) then you need to worry about them.

Yes, that makes for a lot of points! Fortunately, these map to an area of the wall. An absorber or diffuser large enough to reach over the entire area covers all the reflections.

- Terry

A different question but still related to the topic. Hi Terry, would you recommend absorbing the first reflection point of a rear surround, assuming it would have a short distance to travel (ie. higher SPL) or to use diffusion on it's first reflection point?

(Oh for reference I am going with a LEDE-type design)

A different question but still related to the topic. Hi Terry, would you recommend absorbing the first reflection point of a rear surround, assuming it would have a short distance to travel (ie. higher SPL) or to use diffusion on it's first reflection point?
There's no obvious reason to absorb the first reflections of any but the front speakers. The front speakers are the ones by which we localize the sound stage for movies. If anything, reflections are good for the surround speakers because they can decrease localization and improve the sensation of envelopment.

- Terry

"Read the Specs" is the correct answer. After all, there are 8" drivers in smaller subs.
If by treatments on the wall you mean absorption(?); I would definitely use them (regardless of speaker type) up to seated ear height. Otherwise, the sound can bounce around the room like a pinball.

well i do have the low half of the walls already treated. Up to about 4 ft I have ceiliong tiles glued over the sheetrock. This is from when I originally setup the thaeter about 5 years ago. At the time these were considered to have decent specs.( this is before 703 nad linacouctics were in wide use around here). I was just wondering if I should take down any of the batting on the top 1/2 of the walls and replace with 703 or something.

Thanks for the answers so far.

Unless it's a problem I wouldn't worry about it. Besides, isn't the yellow ceiling tile insulation 703?