Starre:
Nice!
It's fun to build your own things!
Salas:
If I simulate your filter I see a drop in the frequency curve between 1kHz-3.5kHz on- and off-axis. And then a little bump from 3.5-5kHz i think it was.
I would understand if you lowered the tweeter from ~1-2kHz upp to 20kHz by ~2dB, but this i do not understand.
What was/is your decision to this drop?
You can see some of what i have tried to explain in your posted FR in the 2-way thread
I'm constructing a loudspeaker (4 actually, tm, tmm, mtmm, mmtmm) with the exact same config, so it would be fun and interesting to hear your thoughts around yor decisions.
Everything else is different about our two speakers except the 2.4mH coil 🙂
Here is a pic of an inroom response of an early active crossover version, and I have since this raised the tuning a bit fixed some other things, like the slope at 2kHz.
Nice!
It's fun to build your own things!
Salas:
If I simulate your filter I see a drop in the frequency curve between 1kHz-3.5kHz on- and off-axis. And then a little bump from 3.5-5kHz i think it was.
I would understand if you lowered the tweeter from ~1-2kHz upp to 20kHz by ~2dB, but this i do not understand.
What was/is your decision to this drop?
You can see some of what i have tried to explain in your posted FR in the 2-way thread
I'm constructing a loudspeaker (4 actually, tm, tmm, mtmm, mmtmm) with the exact same config, so it would be fun and interesting to hear your thoughts around yor decisions.
Everything else is different about our two speakers except the 2.4mH coil 🙂
Here is a pic of an inroom response of an early active crossover version, and I have since this raised the tuning a bit fixed some other things, like the slope at 2kHz.
That green curve is two speakers playing pink noise in room, taken at 2.5m distance at the center. So the mic was off axis to both. Thus its not easy to repeat for a mono speaker on axis with data taken in an other situation like yours. As for why I did it the way I did, is it was flat initially through the mids but when both were playing I judged it a bit forward for piano and vox.
Thanks Schmutziger, the drivers are very good and I hope you get it just right for your taste 🙂.
My pic is also two speakers but ~3m away measurerd in center of both speakers.
Probably with the speakers crossingpoint ~0.3-.5m in front of the mic. so "off-axis" for me to.
but measured with a sweep not noise.
ok, we have solved that in different ways then.
Probably with the speakers crossingpoint ~0.3-.5m in front of the mic. so "off-axis" for me to.
but measured with a sweep not noise.
ok, we have solved that in different ways then.
Very little toe in for the speakers when I got the green curve. But if you get flat mids with 8 inch drivers when the mic is off axis, aren't they boosted for level there a bit when the mic is on axis to each one individually? What happens if you measure the pair when each one is looking almost straight ahead to the room?
Thanks!
I'm getting there!
"some" cross-over work to do though...
🙂
Salas:
At current they measure very straight on axis and quite straight off-axis.
experimenting with waveguide in order to reduce tweeter power off-axis
Going to do a lot of measuring in a couple of days(hopefully) could post some pics when it's done, and if it looks and sounds good 🙂
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I use my speakers with rather much toe-in since I want to reduce first reflex from side walls. I also think the overall balance is good like that, not too forward at all from my build.
The mids response are very much dependent on the individual box dimensions and shape also. Schmutziger, are your boxes analogous? Got early pictures?
salas:
passive cross-over now but not here 🙂
minidsp xo in this pic
Maybe i'll start a new thread about my "feelgood" speaker project 🙂
note the tweeter is HDS but with a frontplate for my main speakers.
Have original frontplate now.
passive cross-over now but not here 🙂
minidsp xo in this pic
Maybe i'll start a new thread about my "feelgood" speaker project 🙂
note the tweeter is HDS but with a frontplate for my main speakers.
Have original frontplate now.
Do I see step back top also? Maybe some felt on the ledge to control diffraction. Those drivers are a good choice in combination. I see you like white color too.
I had that idea too, using the tweeter on top of the woofers cabinet but I did not want to alter it since I was not sure what would happen. Looking promising, nice to see it!
It would be an unpredictable outcome. Would need crossover redesign. Cabinet diffraction and centers of wavefront emission are integral to the development of any speaker. At least they should be.
Yeah Salas, I suspected it would mean a different speaker. Maybe if I make a cheap 2-way learning project that idea is worth trying. I was thinking that if you can place tweeter on top but keep the same volume for woofer it would be possible to skip the stands since the tweeter is higher.
The two drivers need keep centers close together. Else, severe lobes are going to form around the transition band.
Yes, but if you make the centers like you said, with the woofer high up in its cabinet, that should be ok, right? Like Smutzigers solution.
Depends in what region this brings the floor reflection destructive interference in combination with listening distance. Center of gravity and mass of construction, impact to box resonance, diffraction pattern due to woofer's emanation point and if it is best point up high, litres you need and if allowing to get enough base area to be stable if building it high, many things. What you will need, is a calibrated mic, handy soundcard, handy software like HOLM Impulse, reading many other projects, time, ideas to test, and passion.
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