here is just a suggestion, an alternative to Nola Brio Trio, or Mini Karlsonator with Dual TC9fd-18-08...
I built NOLA Brio Trio, just in foam core, and just for fun. While it played ok with the sub, ultimately, I did not like two things:
first, two tweeters in a sense, as one is run fullrange, one with high pass, still, both project heights...I do not like that
second, while TC9fd is performing well in midrange area, and may be extended to the heights, when it comes to of axis, it starts beaming terribly from about 5kHz. Just look at of axis response.
So I converted Nola Brio Trio to typical MTM with small Dayton dome. Quick and dirty crossover, measurement and listening lead to an amazing sounding neutral speaker. I have not saved the measurements, but it was exceptionally flat. I may redo the measurements once I paint the foam core.
If you need HiFi bookshelf, built this one...
If you run it from 150Hz with sub, you will love it.
I built NOLA Brio Trio, just in foam core, and just for fun. While it played ok with the sub, ultimately, I did not like two things:
first, two tweeters in a sense, as one is run fullrange, one with high pass, still, both project heights...I do not like that
second, while TC9fd is performing well in midrange area, and may be extended to the heights, when it comes to of axis, it starts beaming terribly from about 5kHz. Just look at of axis response.
So I converted Nola Brio Trio to typical MTM with small Dayton dome. Quick and dirty crossover, measurement and listening lead to an amazing sounding neutral speaker. I have not saved the measurements, but it was exceptionally flat. I may redo the measurements once I paint the foam core.
If you need HiFi bookshelf, built this one...
If you run it from 150Hz with sub, you will love it.
Attachments
Good thinking for your revised design.
Are you still using open backs for your TC9fd drivers or did you mount them in boxes?
Are you still using open backs for your TC9fd drivers or did you mount them in boxes?
This is interesting as I just finished the Nola Brio prototype. I agree with you about the beaming off axis. I may have to try this. Are the drivers mounted as close as possible? Which Dayton dome?
How are you not getting huge comb filtering with such a small MTM? Wouldn't it be prudent to re-structure it as a 2.5-way where you bring in the second TC9 below the 1/4 wavelength spacing?
Btw...I will take picture of actual speakers, I placed TC9's very close to each other, since the tweeter is really tiny.
Btw2...if the comb filtering issue be there, should not that be applicable to Nola Brio Trio mainly? Think about it...
Btw2...if the comb filtering issue be there, should not that be applicable to Nola Brio Trio mainly? Think about it...
Sorry, I think my message came across more inflammatory than I meant, I was more surprised than anything. Not sure about the NOLA at all, I just looked at the title and went from there.
Please post some pictures. What a great concept and bet it sounds better than the Nola's😉
Cool. Instead of caulking or whatever you are using to fasten them to the foamcore, Spax drywall screws well very well - just hotmelt glue a piece of corrugated cardboard on backside for screw to bite into.
Measurement looks very good!
Measurement looks very good!
Just rambling here...
I briefly looked at Holm data and noticed well behaved phase response. Flat accross the crossover point. Most likely great contribution to the natural coherent sound. Amazing speakers considering the price and construction.
Do not forget to switch tweeters polarity, otherwise you geat nasty dip at 4.5 kHz and phase is a mess.
Other contributing factor to great sound is open back and high pass filter from 150Hz.
Not sure how it would behave if you run it fullrange (not recommended).
Other minor downside is power handling. This is not a party speaker.
Otherwise this is a great speaker to build just for fun. Reward guarantied.
I briefly looked at Holm data and noticed well behaved phase response. Flat accross the crossover point. Most likely great contribution to the natural coherent sound. Amazing speakers considering the price and construction.
Do not forget to switch tweeters polarity, otherwise you geat nasty dip at 4.5 kHz and phase is a mess.
Other contributing factor to great sound is open back and high pass filter from 150Hz.
Not sure how it would behave if you run it fullrange (not recommended).
Other minor downside is power handling. This is not a party speaker.
Otherwise this is a great speaker to build just for fun. Reward guarantied.
Thanks adason. I'm going to try this. I think I have everything except the tweeter. And, I might as well pickup more TC9's 😀