Hi folks,
I'm tempted of reading on bipole projects again, due to the reason one can neglect the baffle step compensation network, thus increase efficiency in the bass region.
I'm aware of the bipole dip of face-back bipoles and I'm wondering if two side midbass speakers would work.
However next come the following challenge - directivity limitation of side speakers. That limits the project to go above 2 way and puts it into 3-way, where a midrange is needed.
Another challenge would be the back location of the speakers, hence their acoustic centers located way back. How does one time align such projects?
What other challenges do you think the designer would have to face?
I'm tempted of reading on bipole projects again, due to the reason one can neglect the baffle step compensation network, thus increase efficiency in the bass region.
I'm aware of the bipole dip of face-back bipoles and I'm wondering if two side midbass speakers would work.
However next come the following challenge - directivity limitation of side speakers. That limits the project to go above 2 way and puts it into 3-way, where a midrange is needed.
Another challenge would be the back location of the speakers, hence their acoustic centers located way back. How does one time align such projects?
What other challenges do you think the designer would have to face?
Isn't the exact benefit of the bipole effect for both driver's omnidirectional responses to overlap, hence the theoretical omit of baffle-step network possible. From that POV I meant to say, increased bass efficiency.
I should have said sensitivity. Efficiency doesn't change but sensitivity increases.
Of course if the patterns overlap that would be the only benefit but you're right about that doubt. I had this conversation with @planet10 who had just been looking at the KEF Blade. It seems if you want to do a side woofer project you'll need to measure and adjust as you go.. just like we do in any DIY project 🙂
Of course if the patterns overlap that would be the only benefit but you're right about that doubt. I had this conversation with @planet10 who had just been looking at the KEF Blade. It seems if you want to do a side woofer project you'll need to measure and adjust as you go.. just like we do in any DIY project 🙂
I have embarked on a bipole project this year. I started with the tweeter. It seems that finding a very shallow tweeter that I could put back to back was the way to go. I made the smallest baffle with rounded edges. These tweeters are the thinnest I've found so far.
Peerless by Tymphany OC25SC65-04 1" Textile Dome Tweeter
Next I searched for 3" dome midranges with large Xmax, and a shallow rear cup. The BiesMa looked to be a good candidate. Mounted back to back in the shipping cardboard for a first listen. It seems a wider baffle may improve the radiation pattern.
I will likely skip the 6" driver shown and go with one of the 10" drivers on the back of the cabinet to have a full range bipole.If done properly I think it will be nearly omni-directional. Here's a side view.
