The point is in my experimentations I preferred a simpler two way design featuring a fully extended compression driver to a three way design experimenting both with mid range compression drivers and various hf tweeters and bullet tweeters. I would now like to optimize the bass section of my speakers knowing now what I prefer and don't prefer. I am not sure much of what you have said in this instance adds to any point though I appreciate your inquiry and I am sure you are more knowledgeable on the subject of speaker building as a moderator than I so thank you for your time.
You're welcome.
If there's one thing, choose your waveguide or horn wisely, it is one of the most important parts of this way of doing things.
The thing is, using too many woofers up to the crossover itself involves matching them with the horn. They will reduce room power below the cross, will this be a problem?
This is a good thing, it has been done successfully. It puts the crossover down lower where the factors are less critical and success is more likely. I think you should pursue this.
If there's one thing, choose your waveguide or horn wisely, it is one of the most important parts of this way of doing things.
I would suggest beginning from the low end up for this. Deal with bass in the room, perhaps look at multiple subs or at least at the problem they are trying to deal with.
The thing is, using too many woofers up to the crossover itself involves matching them with the horn. They will reduce room power below the cross, will this be a problem?
What does this mean reducing room power? I am not sure if it would be a problem though it reads as though it would be.
4x12" is going to start narrowing in directivity above a few hundred Hz. If the horn isn't also narrow, then after you adjust the listening axis sound level there will be less power into the room. There will therefore be more above and below in frequency, meaning you can have a balance issue. (This doesn't mean you can't find a way to use more woofers.)
Yeah I also feel single 15" is plenty for midrange use and cramming more drivers close to waveguide is not necessarily easy, perhaps more problems than advantages. On the other hand the room sized wavelengths could benefit multiple drivers so I would use the waveguide + 15" in smallish sealed enclosure as main speakers and then add in as many woofers as you like, low passed as subwoofer system.
If you want two 15" drivers to play up to the waveguide xo I see no other option than use them in MTM configuration, or perhaps sidebyside below huge waveguide. Perhaps some 2.5 way system. None of these don't seem logical to me as TM + subs but it doesn't mean they wouldn't be logical to others. Have you seen shadow of the colossus?
Have fun!🙂
If you want two 15" drivers to play up to the waveguide xo I see no other option than use them in MTM configuration, or perhaps sidebyside below huge waveguide. Perhaps some 2.5 way system. None of these don't seem logical to me as TM + subs but it doesn't mean they wouldn't be logical to others. Have you seen shadow of the colossus?
Have fun!🙂
Ok I appreciate the suggestions all of which seem valid. That shadow of the colossus is serious business and a large scale implementation of a similar idea I suppose.
Here are some general thoughts and an alternative approach to the design which have also been considering.
-With the 2x15 or 4x12, one option is to orient the two 15s vertically and suspend the compression driver//waveguide centered in front of either the two stacked 15" woofers, or quad 12" woofer array and apply a static time delay to the hf section at the crossover, and perhaps eventually deal with a more dynamic approach to resolving phase offset and group delay. Seems the most optimal configuration for an active design of this nature with the availability of DSP.
-Right now I am using a single Beyma 15G40 woofer beneath a CP755ND mounted to a waveguide crossed at 700hz, per channel. Perhaps a more logical alternative than any of the previous design ideas, is a three way which features a single or pair of 10 inch driver like a Beyma 10MI100 crossed at around 100hz either MTM or TMM vertical. And a pair of subs like the Ciare 15.00SW per left right channel at the 100hz crossover point. A couple questions about this configuration, is there an advantage to using a single 10inch driver per channel compared with two when listening at 15' in a 15' wide by 40' deep room? What is a means to determine again the proper spacing and orientation of said 10" drivers if I went this route? Is there an advantage to a 12" or 15" driver, as originally intended, rather than a 10" driver for midrange playback from 100hz? Which other drivers in the 10" category might be worth considering as an alternative to the Beyma if anyone knows -- Faital's offerings are the others that come to mind. Also, in the interest of reducing the size of the build, can I get by with a smaller sub like a 12" or 10" and still achieve the same performance. Are there performance advantages to a smaller subwoofer driver in this instance and if so please recommend which for those who have experimented in this way? Thanks.
Here are some general thoughts and an alternative approach to the design which have also been considering.
-With the 2x15 or 4x12, one option is to orient the two 15s vertically and suspend the compression driver//waveguide centered in front of either the two stacked 15" woofers, or quad 12" woofer array and apply a static time delay to the hf section at the crossover, and perhaps eventually deal with a more dynamic approach to resolving phase offset and group delay. Seems the most optimal configuration for an active design of this nature with the availability of DSP.
-Right now I am using a single Beyma 15G40 woofer beneath a CP755ND mounted to a waveguide crossed at 700hz, per channel. Perhaps a more logical alternative than any of the previous design ideas, is a three way which features a single or pair of 10 inch driver like a Beyma 10MI100 crossed at around 100hz either MTM or TMM vertical. And a pair of subs like the Ciare 15.00SW per left right channel at the 100hz crossover point. A couple questions about this configuration, is there an advantage to using a single 10inch driver per channel compared with two when listening at 15' in a 15' wide by 40' deep room? What is a means to determine again the proper spacing and orientation of said 10" drivers if I went this route? Is there an advantage to a 12" or 15" driver, as originally intended, rather than a 10" driver for midrange playback from 100hz? Which other drivers in the 10" category might be worth considering as an alternative to the Beyma if anyone knows -- Faital's offerings are the others that come to mind. Also, in the interest of reducing the size of the build, can I get by with a smaller sub like a 12" or 10" and still achieve the same performance. Are there performance advantages to a smaller subwoofer driver in this instance and if so please recommend which for those who have experimented in this way? Thanks.
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