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I didn’t see an intro thread, I apologize if I missed it. Posting from Sacramento region of Northern Cali. I recently got back into cars & car audio which led to needing music in the garage while I work which let to, well so on and so forth. Please forgive my ignorance as I have never dived this deeply into speaker/crossover design so I am just learning.
Background:
Picked up a DA DTA2.1BT2, the MK402X speakers (back ordered), and the HSU VTF-2 for my garage 2.1 system.
I liked the mini set-up so, even using my car speakers, much I decided to get a system for my daughter’s college studio. She needs a headphone jack so I picked her up:
Topping MX-3, B652 Airs (because they were in stock versus the MKs and the right $), and a DA Sub-800
So I’ve been reading and learning about crossovers and also reading on all the mods for the B652 Air (and I didn't want to resurrect any of those old threads).
Just when I think I am figuring out crossovers and have components picked out I find info that confuses me.
For example, in this thread linked here 63991-dayton-b652-air-improved?244602-Dayton-B652-AIR-IMPROVED=&highlight=b652 Calspeak says
“The next thing I did was reverse the tweeter polarity connections at the back of the tweeter like the other modder did. Also added considerably more stuffing. About 10 inches of stripped R-13 OCFG insulation.
Replaced the 3 ohm tweeter resistor with a 12W Mills 6 ohm resistor because the highs were measuring and playing a bit hot. Lastly, I added a 1 mH air core coil (20 ga.) in series with the woofer”
The first part all makes sense but isn’t adding a 1 mH inductor in series with a woofer creating a 1st order low pass XO well below a woofers upper frequency limit not to mention well below the tweeter’s low end range? I realize some of the calculators out there don’t account for the “R” value of the electrical component being used but that wouldn’t have that much of an influence would it?
The Zaph woofer crossover also shows a 1.0 mH inductor but with an 8.0 uF cap. Again, any calculator I tried whether LR, Butterworth, undefined seems to indicate a low pass Freq <1400
I won’t get into augerpros mod, post already too long
At first, I was confused by the Dayton Audio crossovers, dayton-audio-45k-lpf-4-low-pass-speaker-crossover-4500-hz-12-db-octave--260-1912
XO uses a Series inductor value of 0.28 mH and parallel capacitor value of 4.4 uF, the calcs I’ve seen suggest values of 0.20 mH and 6.25 uF are needed
But then I found the calculator on part express where you can pick the type of crossover. The DA values line up with a 2nd order LR XO. What I don’t know is what the other sites are basing their calcs on (BW?).
I’m assuming this discrepancy is due to the effects of the overall circuit and the rest of the components properties (i.e. like their resistance) but in the end I don’t like to assume. Am I looking at this the right way?
I was going to try out the free software from Vituix. I have had good luck (I think, from a privacy standpoint) with REW, EAC, and various other open source software but for some reason I got a little paranoid with this one. No rhyme or reason, I guess just getting a little paranoid the older I get. Unfortunately I missed getting back to my computer yesterday for the 15% sale (it was 15% not $15 I think). I may have been able to talk myself into the speaker DATS and the PE XO software.
I guess the takeaway is to find a better single source to learn more about crossovers then multiple snipets from various websites. What are those things called we used to buy to learn, books or something like that.
Ultimately, I am not looking to spend a lot on the B652, my daughter will never know, even if I do, but if I can do some low cost 1st order XO to smooth things out a hair, I would like to do that for the fun factor and learnings I get out of it.
I'm interested in improving the blending of the sub with the B652 on the low end and get the B652 away from where they may distort. Maybe a highpass around 100 to 120 Hz
I will have install materials left over from the car project so I can install CLD and CCF foam in the speakers without any additional cost.
I can add in a couple 1/2" diameter rods as well, can these just be glued/wedged in?
The tweeter mod, if not already done on the set I have, is easy enough.
Is it worth doing a 1st order low pass on the woofer before its natural roll off or in essence use a band pass on the woofer? I can't start the roll off where some of the known woofer breakup is because the tweeter doesn't reach that low according to the specs so what LP freq makes sense? I was thinking 4000 to 4500.
Thanks in advance to all of those that made it this far!
Take care!
Background:
Picked up a DA DTA2.1BT2, the MK402X speakers (back ordered), and the HSU VTF-2 for my garage 2.1 system.
I liked the mini set-up so, even using my car speakers, much I decided to get a system for my daughter’s college studio. She needs a headphone jack so I picked her up:
Topping MX-3, B652 Airs (because they were in stock versus the MKs and the right $), and a DA Sub-800
So I’ve been reading and learning about crossovers and also reading on all the mods for the B652 Air (and I didn't want to resurrect any of those old threads).
Just when I think I am figuring out crossovers and have components picked out I find info that confuses me.
For example, in this thread linked here 63991-dayton-b652-air-improved?244602-Dayton-B652-AIR-IMPROVED=&highlight=b652 Calspeak says
“The next thing I did was reverse the tweeter polarity connections at the back of the tweeter like the other modder did. Also added considerably more stuffing. About 10 inches of stripped R-13 OCFG insulation.
Replaced the 3 ohm tweeter resistor with a 12W Mills 6 ohm resistor because the highs were measuring and playing a bit hot. Lastly, I added a 1 mH air core coil (20 ga.) in series with the woofer”
The first part all makes sense but isn’t adding a 1 mH inductor in series with a woofer creating a 1st order low pass XO well below a woofers upper frequency limit not to mention well below the tweeter’s low end range? I realize some of the calculators out there don’t account for the “R” value of the electrical component being used but that wouldn’t have that much of an influence would it?
The Zaph woofer crossover also shows a 1.0 mH inductor but with an 8.0 uF cap. Again, any calculator I tried whether LR, Butterworth, undefined seems to indicate a low pass Freq <1400
I won’t get into augerpros mod, post already too long
At first, I was confused by the Dayton Audio crossovers, dayton-audio-45k-lpf-4-low-pass-speaker-crossover-4500-hz-12-db-octave--260-1912
XO uses a Series inductor value of 0.28 mH and parallel capacitor value of 4.4 uF, the calcs I’ve seen suggest values of 0.20 mH and 6.25 uF are needed
But then I found the calculator on part express where you can pick the type of crossover. The DA values line up with a 2nd order LR XO. What I don’t know is what the other sites are basing their calcs on (BW?).
I’m assuming this discrepancy is due to the effects of the overall circuit and the rest of the components properties (i.e. like their resistance) but in the end I don’t like to assume. Am I looking at this the right way?
I was going to try out the free software from Vituix. I have had good luck (I think, from a privacy standpoint) with REW, EAC, and various other open source software but for some reason I got a little paranoid with this one. No rhyme or reason, I guess just getting a little paranoid the older I get. Unfortunately I missed getting back to my computer yesterday for the 15% sale (it was 15% not $15 I think). I may have been able to talk myself into the speaker DATS and the PE XO software.
I guess the takeaway is to find a better single source to learn more about crossovers then multiple snipets from various websites. What are those things called we used to buy to learn, books or something like that.
Ultimately, I am not looking to spend a lot on the B652, my daughter will never know, even if I do, but if I can do some low cost 1st order XO to smooth things out a hair, I would like to do that for the fun factor and learnings I get out of it.
I'm interested in improving the blending of the sub with the B652 on the low end and get the B652 away from where they may distort. Maybe a highpass around 100 to 120 Hz
I will have install materials left over from the car project so I can install CLD and CCF foam in the speakers without any additional cost.
I can add in a couple 1/2" diameter rods as well, can these just be glued/wedged in?
The tweeter mod, if not already done on the set I have, is easy enough.
Is it worth doing a 1st order low pass on the woofer before its natural roll off or in essence use a band pass on the woofer? I can't start the roll off where some of the known woofer breakup is because the tweeter doesn't reach that low according to the specs so what LP freq makes sense? I was thinking 4000 to 4500.
Thanks in advance to all of those that made it this far!
Take care!
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