But you did suggest that crappy looking B&C coax tweeter
I could find better ways to do 3way 😉
And I don't want to build speakers that I don't think will work well. You asked how you could "convince me". I'm not convinced and doing yourself - or paying me to do it - is what it would take. (You don't really want to know what a custom design would cost - trust me.)
Lets just say that I wouldn't expect them to work significantly better, yet be eight times as big and about ten times as expensive. Sounds like a real winner to me - NOT!
Any other specific reasons besides size and cost? Why is the magic number for directivity 1000 Hz and not 500 Hz or even lower where geometric acoustics still is a valid concept?
My understanding is that lowering the crossover frequency from 1 kHz to 500 Hz would necessitate adding a high frequency driver because (like Earl said) drivers which can go that low cannot also go high enough, and the inevitable compromises arising from the additional complexity would likely more than offset any advantages from maintaining constant directivity down to 500 Hz.
well, size and cost certainly are significant issues- I guess the other part of it would be that unless you were going to attempt full-bandwidth, you'd have to find a woofer that's directional at the XO while still behaving well, and there are a VERY limited selection of good 30" drivers.
Would love to see you do one with the ginormous fostex woofer and a 30+" waveguide though!
There's much to be said for limiting size. Unfortunately, it's at odds with limiting efficiency. Our solutions have to fit into the real world. If Markus has unlimited space and resources.... he can make his ultimate system. Of course, people have been attempting that with lowthers for nearing 70 years......
Yes that's what he said but Earl also didn't answer my question here http://www.diyaudio.com/forums/gedlee/122318-diy-waveguide-loudspeaker-kit-154.html#post2024941 😉
I'd think an important reason is that we're less sensitive to imaging cues at 500 Hz with resulting less benefit from CD characteristics.
Was looking recently at multicellular horns... came across this midbass horn:
HiFiForum.nu - En man...*Midbashornmätningar*
Graph is about half way down the page... looks pretty CD from 100-500hz...
Whats to be gained from having directivity this low?
My house is twenty eight hundred square feet, and it's a challenge to find room for the Summas. If I did it again, I go with the twelves.
Originally I had them in a basement, and having all that space to work with was nice. It's hard to grasp how much space these things take up.
"I'd think an important reason is that we're less sensitive to imaging cues at 500 Hz with resulting less benefit from CD characteristics."
"Do you have any scientific data to support this claim?"
I don't personally possess the data, it's just what I've read several times.
To be clear, I've read what I said about freq at which imaging cues occur, and am inferring the lack of as much benefit from extending CD below that.
Do you have reason to dispute it?
"Do you have any scientific data to support this claim?"
I don't personally possess the data, it's just what I've read several times.
To be clear, I've read what I said about freq at which imaging cues occur, and am inferring the lack of as much benefit from extending CD below that.
Do you have reason to dispute it?
Patrick
Don't see why a big speaker with high directivity needs more space than a "normal" loudspeaker?
Best, Markus
Don't see why a big speaker with high directivity needs more space than a "normal" loudspeaker?
Best, Markus
Noah
Did you read it in a scientific paper or somewhere else?
Unfortunately yes. You have Toole's book, right? Look up page 238. He's talking about stereo bass and cites a study by Martens et al. that found localization cues down to 80 Hz.
Best, Markus
Did you read it in a scientific paper or somewhere else?
Unfortunately yes. You have Toole's book, right? Look up page 238. He's talking about stereo bass and cites a study by Martens et al. that found localization cues down to 80 Hz.
Best, Markus
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