Go to Hificompass website, he gave quite extensive subjective comments.
On my side, it's far too early, my project is still a work in progress...
On my side, it's far too early, my project is still a work in progress...
Hi Jean , I am newbie in this forum and thinking of building a similar 3-way as yours with almost same drivers like Bliesma T34b (with WG) , M74B & Purifi 8'' . So need assistance on the x-over based on your progress . Can you please PM . Thanks
Per PM request, Here are the values for the M74Be twin notch filters posted here earlier in this thread :
26µH // 4.7µF and 26µH // 3.3µF.
Please note that these values will have to be slightly adjusted according to real impedance data of each driver for the max performance.
In general, measure real value of each capacitor, introduce it in VituixCAD, optimize the value of inductor accordingly, wind the coil and adjust the value with a LCR bridge
26µH // 4.7µF and 26µH // 3.3µF.
Please note that these values will have to be slightly adjusted according to real impedance data of each driver for the max performance.
In general, measure real value of each capacitor, introduce it in VituixCAD, optimize the value of inductor accordingly, wind the coil and adjust the value with a LCR bridge
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Sorry if I missed the info in your posted measurements, but at what SPL and distance was the distortion measured?
Your mistake, look the picture more carefully, 4K H2 (red) is not down by anyway but hidden, by THD
I was showing H3 and H5 there
I was showing H3 and H5 there
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Ah OK I understand now,
I have no clue maybe related to the big dip around 12 K but anyway with a crossover around 3 - 3.5 KH I don't care...
I have no clue maybe related to the big dip around 12 K but anyway with a crossover around 3 - 3.5 KH I don't care...
OP, once you've finalized your speaker design, ask a friend to blindly toggle your notch filter. Two of the potential and likely outcomes to the experient may surprise you.
May I ask you why you wrote this (no pun intended at all) Any personal experience to share ?
OK, the two serial notch filters are in series with the driver but effect should be largely out of the band pass, don't you think so ?
OK, the two serial notch filters are in series with the driver but effect should be largely out of the band pass, don't you think so ?
On many occasions, I added complexity (e.g. notch filter) to my design which sometimes, after blind testing, was found to be beneficial, neutral or detrimental.
The audibility of a resonance, and distortion rise caused by it, is dependent on many factors. Many AES papers document this in great detail.
It would be interesting to know if one can hear the M74B peak in a system when listening to music (not test tones).
If you do find it to be audible, try a passive elliptical LP filter realized by adding a capacitor+resistor across the series inductor of the LP crossover.
The audibility of a resonance, and distortion rise caused by it, is dependent on many factors. Many AES papers document this in great detail.
It would be interesting to know if one can hear the M74B peak in a system when listening to music (not test tones).
If you do find it to be audible, try a passive elliptical LP filter realized by adding a capacitor+resistor across the series inductor of the LP crossover.
By crossing it lower 🙂
Btw the breakup paranoia is a little bit unfounded imo, I'm crossing with FIR 48dB/Oct at those frequencies so I'm not sure what is there to gain by those notch filters.
Something that I also just noticed, your measurement with those notch filters actually has more total HD than without them
Isn't because you are just looking at the THD number in the lower part of pictures, on my side when I look at the whole picture I can see a very noticeable improvement...
Honestly, No, at least for the moment. For the time being I'm still refining refining my system and the crossover. When done, I will spend time to listen with/without and we will see...
