I understood what you meant, it was me who wrote it backwards! 🙂
Why cardoids work better than dipoles and monopoles placed close to a front wall is kind of obvious, and that is the whole reason I want to use the concept. In my room the speaker will have to be fairly close to the wall.
I was just curious about how you found out that keeping the back sealed and only have holes to the sides worked better when close to the front-wall. But I guess you kind of answered it. I can just measure the speaker outside facing upwards with a distance similar to what I have in the listening room and then see how different layouts affect the response.
I believe the cardoid pattern won't have very much impact on sidewall reflections since they don't attenuate that much to the sides. But as someone said; don't let perfect be the enemy of good.
thanks again
Why cardoids work better than dipoles and monopoles placed close to a front wall is kind of obvious, and that is the whole reason I want to use the concept. In my room the speaker will have to be fairly close to the wall.
I was just curious about how you found out that keeping the back sealed and only have holes to the sides worked better when close to the front-wall. But I guess you kind of answered it. I can just measure the speaker outside facing upwards with a distance similar to what I have in the listening room and then see how different layouts affect the response.
I believe the cardoid pattern won't have very much impact on sidewall reflections since they don't attenuate that much to the sides. But as someone said; don't let perfect be the enemy of good.
thanks again
Well, at 90 degrees off-axis we get between -5 and -10 dB, depending on the exact configuration. You can get similar results with the appropriate waveguide, for a truly constant directivity speaker.
Okey, that sounds reasonable... I guess a shallow waveguide with a dometweeter would be quite close to that. And in many situations that would be a really good design.
But for my own personal taste and listening room I prefer greater directivity, especially from 800-8kHz to significantly lower first reflections in level, so I'll be using a more directive waveguide/horn.
But for my own personal taste and listening room I prefer greater directivity, especially from 800-8kHz to significantly lower first reflections in level, so I'll be using a more directive waveguide/horn.
And how does perforating the U-baffle solve the problems inherent to the U-baffle?
Amphion does this in a commercial offering that set the reviewers pens on fire, but at nearly $20k, there wasn't any smoke.
Anyways, the amphion lineup is pretty impressive across the board.
Anyways, the amphion lineup is pretty impressive across the board.
keyser, a lot of the pictures in the original post are missing. Can you re-host the pictures?
Unfortunately you'll have to ask a mod to edit the post for you, but it's a great resource for thinkers-outside-the-box.
Unfortunately you'll have to ask a mod to edit the post for you, but it's a great resource for thinkers-outside-the-box.
I agree! I've come back to this thread many times and it's a bummer not being able to see all the pics. It was a few years ago tho......
Keyser. Can I kindly ask you to upload those missing photos. It is hard to start and follow the thread for a new comer.
More to come. I'll copy the first post later and I'll add the images at the right spot.
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This was the first cardioid speaker I ever built. Since then I learned a lot about how to optimize them. The reduction in loudness relative to the front can be improved considerably in comparison to this speaker. Since then I started a business called Dutch & Dutch. Here you can find some technical information about the 8c, including measurements.
EDIT: I see now that the images have very low resolution. I'll have to fix it later.
EDIT: I see now that the images have very low resolution. I'll have to fix it later.
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Wow! That new speaker of yours looks amazing!
May I ask the profile of the waveguide? And is that a Seas tweeter you're using?
May I ask the profile of the waveguide? And is that a Seas tweeter you're using?
Would you care to share some tips on controlling the front wave relative to the back wave?
Ps your product in that link looks excellent
Your Studio 8C looks damn good. Must work wonders in typical living rooms.
How is the LF section arranged? Thanks.
How is the LF section arranged? Thanks.
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