All this made first time ever. Really hard to doo at first time. For impedance mesuaraments amplifier + voltage divider used.
It looks like I made a mistake when measuring the woofer.
From REW manual
"For single added mass measurements the mass added should be approximately half the expected Mms figure. For dual added mass make one measurement with masses that total a little less than the expected Mms"
This is probably why the VAS parameter for 10RS350 is too small. My mistake added mass 18 and 24 grams.
From REW manual
"For single added mass measurements the mass added should be approximately half the expected Mms figure. For dual added mass make one measurement with masses that total a little less than the expected Mms"
This is probably why the VAS parameter for 10RS350 is too small. My mistake added mass 18 and 24 grams.
In the end,, I chose SB26STCN tweeters. Just because they are cheap. After I noticed more candidate like VIFA DX25TG-05-04 or new Scan-Speak D2604/830000 but it was too late.
I'am happy how they reproduce music. They are big. The soundstage deepth, size is bigger compared too 2way i have before. Still adjustin highs, mids for my taste. Now waiting D class amplifier with PAM8803 chip. At first only one for test. This chip have crazy digital volume gain setings from -75db to 23db. This is perfect for high sensitivity speakers. Frum my calculations and experiments i need only some 0.5w to one channel. From PAM8803 manual for 1w, 1% THD. Hope this is enough.
Attachments
Depends on volume level, room size. If enough 90 dB per 1 meter SB26STCN is good.
Crossed at 2.4, 2,6 works great close too 90db. If you cross higher, 6rs140 can be heard, but all this is more metter of teste and how works with room together. If you need louder, better to choose the option from Troels.
Scan-speak D2608/913000
More candidate SCAN SPEAK D2604/830000.
I really like what you got for price. I didn't notice this tweeter while looking for the right one. Perhaps I would have chosen it, but it is slightly more expensive than the SB26. SB26 is ideal for near field, small room. Excellent price!
I really like what you got for price. I didn't notice this tweeter while looking for the right one. Perhaps I would have chosen it, but it is slightly more expensive than the SB26. SB26 is ideal for near field, small room. Excellent price!
What about, 1st order passive and then correct the slopes with additional active filters, like 1st+2nd? That way you stretch the capabilities of the amplifiers. A series inductor in the bass changes the output impedance of the amplifier in a frequency-dependent way that benefits the midrange distortion of most woofers.
Padding the tweeter with series resistance does something similar, and those changes are v.hard to replicate in an active system unless you go down the path of designing your own amplifier.
1-10mH air-core can be wound with a variable speed power drill, and unless you want to rattle windows I would personally deliberately use a light gauge, but YMMV.
You could even try some pre-emphasis on the tweeters and then pad them down with inductance.
Padding the tweeter with series resistance does something similar, and those changes are v.hard to replicate in an active system unless you go down the path of designing your own amplifier.
1-10mH air-core can be wound with a variable speed power drill, and unless you want to rattle windows I would personally deliberately use a light gauge, but YMMV.
You could even try some pre-emphasis on the tweeters and then pad them down with inductance.
For me no sence. Too small difference overall compared to in room sound. These measurements before from 88cm and 90 deg. They are different at 30 deg in reality. Not so big difference oweral to sound mooving litle by litle x over points, and changing slopes. There is total measurements from listening position with room.
Some work done with booth bass drivers. Some 3-4 points for each bass driver. My room is not symmetrical an this is pain with passive system.
I am now with 21L for bass driver. I don't know if it's worth trying 45 liters like Troels did. I wonder what happens if I try.
Distortion changes won't show up on frequency plots. You'll either need a distortion analyser, or have to listen for the changes.
Distortion level controlled, all this done. Distortions monitored after each correction. All this only for bass drivers.
There is more interesting comparison between different amplifiers and 6rs140 mid driver with LR2 slopes.
Good amplifier makes small distortions 😎 All mesuaraments with identical volume level +- 1db.
There is more interesting comparison between different amplifiers and 6rs140 mid driver with LR2 slopes.
Good amplifier makes small distortions 😎 All mesuaraments with identical volume level +- 1db.