WAF issues

[GM]

Greets!

Well, we don't have a clue what the details are of your proposed layout, so for now all I'll say is you need to make a scale drawing of your room and draw whatever beamwidth angle covers the listening area at preferably all channel locations or at least the three screen wall ones using the THX various set-up guidelines: http://www.thx.com/home/setup/index.html

Note that the goal here is to not have any early reflections above ~1 kHz, i.e. when you draw your patterns they in theory shouldn't touch any boundary (wall, ceiling, floor) until they pass behind the listening area.

Obviously, meeting this requirement without using CD horns or at least waveguides (WG) on 'FR' drivers will severely restrict the room layout, so you do the best you can in your choice of drivers (bigger = narrower beamwidth) and add throw rugs on the floor if not carpeted and hang any decorative wall coverings as required using the 'mirror' method to find the first reflection, etc.. WRT the ceiling most folks are caught between a 'rock and a hard place' due to building constraints, so typically the speakers are either put either near the floor aimed up or up high aimed down when a front projector is used depending on several variables, though personally I prefer aimed down if for no other reason than when you go to a cinema or live sound event the sound is coming from above if you don't typically sit in the balcony or bleachers.

Ideally you want the HF BW drivers at 2/3 screen height to lock in the dialogue to the actor's heads, so typically the CC either sits on top or below the screen with the mains somewhere along the screen height on each side, but at best this sucks IMO, so putting the tweeters in line horizontally is a much better compromise and if mounted across the top, then space them up so that there's enough of a gap to ~eliminate the screen's impact on the CC's response (usually found through experimentation) if you're not willing to add similar size baffle boards to the mains to tonally balance them out.

WRT mains cab sizes, sub systems and their blending when using bass management, in theory you'll use an 80 Hz 4th order XO to a powered sub system that either is < 1/3 WL/80 Hz away from the farthest driver (~54" 'as the Crow flies') or there's a separate sub system for each channel to meet this spec. The room dominates down low though: http://www.harman.com/wp/pdf/multsubs.pdf

Anyway, once you've gotten the basic layout worked out, then we can start talking particulars.

GM

[Godzilla]

http://www.zillaaudio.com/fostex207e-box-plots.htm

Here are some plots for the Fostex 207e in WinISD. The 13L looks good but I did not do a sealed 10L for comparison. Regardless, they will need subs to sound thier best in smaller enclosures.

Hope it helps.
Godzilla

[Lostcause]

WOW! Sorry been glued to the box this morning watching our cyclists and rowers do the business

Thanks a lot for the input and advice those plots surprised me on the 35ltr but like you say, the 13L does look good when partnered with a sub.
The setup is for a dining room with a dresser on one wall and the table on the other, this is where I do most of my listening... over a meal and a bottle of wine
The MLTL's used to be at the far end by the french windows, an excellent place that filled the room nicely. There are to be a couple of lounging chairs and a coffee table up there now so that's why she wants 'em moving.
They are currently against the wall where the new unit will go but this is what I want to build them into with a central sub.

Thanks again for the input chaps, very much appreciated

100M final's on... gotta go

[norman bates]

have you given any thought to a diy like the wall hanging cornu ?

http://www.diyparadiso.com/cornu1.htm

http://blogs.msdn.com/andrewdelin/ar...29/507944.aspx

I prefer a speaker with tweeter or full range driver exactly at 1/2 the tv height.

[Lostcause]

Now they are pretty cool

I like them and the wife even approves although my finances are low and I wonder what size they would be with 207E's in there?
Base response isn't too bad either but I would still need a sub in there I would think?

I was going to put big boxed canvas paintings on the wall so these would be spot on.

Thing is, if I still need a sub then would I need to bother with the spiral horn? Just a simple ported shallow box maybe?

This is getting really interesting..... thanks guys

[lowtherdream]

Just hide them under the floor

http://www.royaldevice.com/custom.htm