I'm using tweeter in waveguide with Seas L15 and i'm still in the process of making it. I will probably end up with LR4 acoustically .
... 1.6Khz crossover means 4th order slopes, can you post your group delay and the decay of an impulse? How do you like the presence in this area of a 25mm dome? (yes I couldn`t hold on this)
Allowing drivers to overlap for me yields better integration, I`ve never enjoyed anything over a second order but this is very subjective and a matter to personal taste.
I will post results when I do more tests, maybe it could be coupling, don`t know yet.
I am listening SB17NRXC35-8/SB29RDC with 1800Hz xover frequency and it sounds good. I can try to find measurements for that because it's finished project - if you are interested.
Well- I don't recall the details at this point of whether they were measured in the baffle, adapted responses, or just using zaph's plots. I do know that these are another xover option for his L18/TBFC design, since they are likely his large-baffled plots adapted to his box design. The person that requested the simulation was not happy with the former version, and liked the results I provided.
They were not spec plots, and were 3rd party at minimum. Since I did not build the sim, I didn't get the final FR measured myself.
Still, the transfer function shows what the filter is doing, and it really helps the breakup take a nosedive and becomes well suppressed.
Mike- thanks for the backup!
Later,
Wolf
See, the doubts I have are less on Wolfs abilities or the simulation by itself. I did not say it's impossible but passive notches are actually a big problem. Often times the simulation works perfectly but put into reality it suddenly does not anymore. How comes? Well, every part involved got tolerances. Mostly the coils and the drivers are the culprits, sometimes capacitors too. Impedance and inductance of drivers differ often quite much, especally at the upper end of its range or - even more cricital - the behaviour at resonances differs vastly. And that means, very steep notch filters can easily become misaligned. And then there's the differences between both speakers, with such filters you'd have to select the parts and measure them separately, it then often ends in re-winding the coils to non-standard values and both crossovers can become quite different and the speakers still measures different. Sure, some tolerances are okay but you practially never see any measurement taken and they just build it like in the simulation. How it sounds is then attributed to "don't like the speaker" or "that's the character of the box" or something similar and not even once it's thought about it might be the own fault. That's my experience and that's why I say 'it does not work' because this very much needed extra mile is something hardly anyone ever goes, sometimes measuring can't be replaced or skipped.
Simulations are only as accurate as the data used to do them. I used real 3rd party measurements to do the sim, so it should be pretty accurate. Sure- tolerances are there. I unwind/wind my coils to value, and label all of my caps and resistors to avoid them becoming the issue. I also use the standard DCR values for the AWG and value of the coil so that remains consistent. Garbage in = Garbage out.
If I build it, then I do verify it, by voicing and/or measurements. There is always a bit of application that will differ from one builder to the next, and that is a tolerance you cannot account for. I understand what you are saying, but to say 'This doesn't work' is a bit of an extreme.
Later,
Wolf
If I build it, then I do verify it, by voicing and/or measurements. There is always a bit of application that will differ from one builder to the next, and that is a tolerance you cannot account for. I understand what you are saying, but to say 'This doesn't work' is a bit of an extreme.
Later,
Wolf
Yes, absolutely right. YOU know it and do it, same for me. But 95% of the ppl however, do not.
Well, you would change your mind if you had the shitstorm comming ("YOU said it works!"
) like I did last time I explained how it works but requires (x, y, z in conjunction with circumstances a and b) something special to be followed precisely. Moreover ppl then just try to apply it on their completely different project where it's not applicable and it (who would have ever thought that? ) failed. The blame goes to.. ..have a guess. So, if 95% can't get it done I now say it does not work in praxis, lesson learnt.CX871 with LC notchfilter
Endorsed by SEAS: New PBN-KIT with SEAS drivers
The maker of the H1208-08 L22RN4X/P 8” Aluminum Cone Woofer.
They even suggested it for their magnesium drivers.
So a bit of an overstatement that it can't be done.
Endorsed by SEAS: New PBN-KIT with SEAS drivers
The maker of the H1208-08 L22RN4X/P 8” Aluminum Cone Woofer.
They even suggested it for their magnesium drivers.
So a bit of an overstatement that it can't be done.
Yes, I read them. Still the same answer
Here is another example:
http://www.seas.no/index.php?option...as-diy-kits&catid=66:seas-diy-kits&Itemid=365
Here is another example:
http://www.seas.no/index.php?option...as-diy-kits&catid=66:seas-diy-kits&Itemid=365
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You obviously did not. I saidYes, I read them. Still the same answer
And I said
too and furthermore
So you've either did actually not read it or you did and chose to ignore it or you didn't understand it. Which one was it? I can get you a number of a teacher ..or an optometrist..
Ofcourse there are speakers which work great with notch filters but a. most of them are not that extremely steep and b. there are still a lot of speakers which are sold by the dozends daily which use notch filters but if you re-measure them as-is from the kit, you realize they actually do differ from 'their' box.
The LC on the 8" in the PBN design isn't even of the same criteria. That is being used to compensate the Fs spike, which really isn't that necessary. There is not an LC taming the breakup at all on that design, instead using 3rd order electrical to get it accomplished.
In the response to ICG- There was a time I did a sim for someone and specified air cores with a higher DCR. He asked if he could buy cheaper I-cores before the purchase, and I explained to him why that would be a futile design choice. He did it anyway to save money, and resultantly said they didn't sound right. I then told him that would be exactly what I warned him about prior.
Sometimes people listen, and sometimes they don't. At least I warned him about it before to cover me.
Later,
Wolf
http://www.seas.no/images/stories/diykits/pdfdataheet/filter_trym.pdf
L2 = 0.22
C2 = 4.3
Resonant freq: 5.2 kHz
Rigth at the hf resonance off the w22
E0022-08S W22EX001
L2 = 0.22
C2 = 4.3
Resonant freq: 5.2 kHz
Rigth at the hf resonance off the w22
E0022-08S W22EX001