If the crossover between mid and tweeter is at 2k, then a waveguide is probably not needed. Both drivers have wide dispersion at that frequency. But this would be an unusual crossover frequency for this mid, and frankly, a waste of its potential. At 3k - 4k, this mid is starting to build some directivity. To achieve the very highest performance, a waveguide on the tweeter will help match the directivity between the mid and tweeter.
In a studio control room, I am not sure that Power and Directivity Index performance is as important as it is in a more typical environment. From what I understand, control rooms are designed to minimize the early reflections, late reflections, and especially ceiling reflections. This means the monitor speaker's direct on-axis sound tends to dominate the response. So ATC, Quested, and similar speakers in a control room may not benefit from a waveguide on the tweeter.
An excellent example of a very well integrated Volt 3" mid with a waveguide tweeter.
OK so the waveguide will reduce the dispersion of the tweeter to match the directivity of the medium , but what happened at the crossing zone as the tweeter will still have much more dispersion thant the dome ?
Of course the mid driver will start to beam at some point where the dispersion will start to differ from the tweeter, but with a sensible choice of crossover point and slope, this would not contribute negatively to the summed response of the crossing.
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You have a transition, depending on the filter slopes.
But that's the point - waveguide should be big enough to already work at this freqeuncy.
Hi, here I think a good visual example. Bliesma T25B + waveguide in the front, ATC on the back. At 3000Hz, aligment is almost perfect. Not too bad at 2500 and up to 4000Hz. 3000Hz should be a nice crossover point. If you look at other tweeters without waveguide, impossible to find such a good match. Waveguide should be approx the same size as the mid (my understanding). Took time to understand that.
I finally decided to go with the Bliesma T25B, I am sure other options (sb21, sb26) were more than good enough but I liked some comments about being on the warmer side. Then, so many saying this is a very very good tweeter, 3d model waveguide available... And as I will keep the speakers for a long time, at least, I will not asked myself every time how the sound would be with the Bliesma...
I finally decided to go with the Bliesma T25B, I am sure other options (sb21, sb26) were more than good enough but I liked some comments about being on the warmer side. Then, so many saying this is a very very good tweeter, 3d model waveguide available... And as I will keep the speakers for a long time, at least, I will not asked myself every time how the sound would be with the Bliesma...
Hi again, now working on the cabinet. Was looking at vintage designs such as the JBL 4312 and other options such as JBL studios, Tandberg Monitor, Tannoy, Warfedale, KLH model 5. They have what I would call the "retracted front panel". Meaning the front panel is on the same level as the corners. Very clean design, not so sure very positive sonically as ideal in my understanding should be flat. But I am surprised to see new speakers still using front retracted panels. Was then thinking about waveguides, is a retracted panel less negative when using waveguides? Here bellow some options, the first one would be straight corners, then 2 would be round or angled corners, 3 would be flat, 4 would be flat with external round corners (not sure how to name it).
I am tempted to go for 1 or 2. I know I should go to 3 or 4... But with waveguides, maybe 1 or 2 is not that bad...? Spending some much time finding a good match between mid and tweeter, then building an unoptimized front ... 🙂 Any experience?
Thanks again for your support!
I am tempted to go for 1 or 2. I know I should go to 3 or 4... But with waveguides, maybe 1 or 2 is not that bad...? Spending some much time finding a good match between mid and tweeter, then building an unoptimized front ... 🙂 Any experience?
Thanks again for your support!
The shallow waveguide for the T25B is still provides wide dispersion, not like a 60-80 degree horn for example. I would forget the 1 and 2 type baffle edge. ATC uses the type 4 which is integrated in the dustgrille on the consumer models and there is rounded edges on the pro versions. But of course, the choice is yours.
pratically go for R4' / R10 (I am not sure is it inch or mm ?? need to seaerch it up) edge, beside the minium sound affecting they are more pratical wont get dented too easily . If you ahve time and money to play around avalon diamond edged tweeter baffle or various woofers probably go for reverse nut and bolt assemble, so you can save your effor making another cabinet, You can search that desgin in parts express forum.
JBL 4312 desgin is too old, you can't throw different type of music to them and are limited to a few genre of musics. You should look at their everest desgin. Don't waste atc mid potential which can take any abuse of various genere of music although a lili bit less emotional then compression drives
JBL 4312 desgin is too old, you can't throw different type of music to them and are limited to a few genre of musics. You should look at their everest desgin. Don't waste atc mid potential which can take any abuse of various genere of music although a lili bit less emotional then compression drives
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Depends if you want to build a design objekt nice to look at and easy to sell with the retro trend - or a proper working speaker.
Straight edges are ALWAYS bad, and version 1 and 2 is even WORSE.
These are very easy to avoid mistakes. They are made cause of design trends.
I avoid them.
Look at that review. The dip at 1,2kHz could have been avoided completely with a proper baffle design.
https://www.audiosciencereview.com/forum/index.php?threads/kef-r11-meta-tower-speaker-review.53282/
It's still a great speaker but would be close to perfect with out that dip and a more linear bass response. And it was heared in the room.
Of course EQ is not the right solution cause off axis is linear - so you get a bump off axis when you get linear on axis.
Another chance let gone cause of marketing.
https://www.audiosciencereview.com/forum/index.php?threads/kef-r11-meta-tower-speaker-review.53282/
It's still a great speaker but would be close to perfect with out that dip and a more linear bass response. And it was heared in the room.
Of course EQ is not the right solution cause off axis is linear - so you get a bump off axis when you get linear on axis.
Another chance let gone cause of marketing.
Hi again.
very clear. Will go for n4. Thanks for your recommendations. Interesting the dispersion of a waveguide versus horn and link to the review of the R11.
Should start the build next week or coming weeks.
Thanks again!
Louis
very clear. Will go for n4. Thanks for your recommendations. Interesting the dispersion of a waveguide versus horn and link to the review of the R11.
Should start the build next week or coming weeks.
Thanks again!
Louis
Thanks again everyone for the support. Here the result!
380Hz 24dB slope on the woofer, 12db on the mid
3000Hz 24dB slope on mid and tweeter. Will try with 12dB as well.
Need to spend so time optimizing everything.
380Hz 24dB slope on the woofer, 12db on the mid
3000Hz 24dB slope on mid and tweeter. Will try with 12dB as well.
Need to spend so time optimizing everything.