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post #1 of 12 Old 01-12-2019, 03:01 AM - Thread Starter
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dayton audio 2-way speaker build

I want to build good sounding 2way speakers with dayton audio rs125p-8 and dayton audio nd28f-6. I have been trying to make a filter in xsim. The plan is to pair these with two old 12" bas speakers in a 3-way speaker. I have a mini dsp and calibrated mic. Could someone give the crossover a check. Its the first time i try this.
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post #2 of 12 Old 01-12-2019, 07:54 AM
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Originally Posted by muppjacob View Post
I want to build good sounding 2way speakers with dayton audio rs125p-8 and dayton audio nd28f-6. I have been trying to make a filter in xsim. The plan is to pair these with two old 12" bas speakers in a 3-way speaker. I have a mini dsp and calibrated mic. Could someone give the crossover a check. Its the first time i try this.
First, did you take in-cabinet measurements of the drivers yourself for the FRD files?

Second, the tweeter leg that goes to ground looks really odd and I don't think you need that (the 82uf cap and 3.0mH coil). Take those out. THe Swope project by Paul Carmody uses the ND28 so I would look at his filter which is:
5.6uf cap in series, .35mh coil to ground, 2 ohm series resistor. Just three parts.
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post #3 of 12 Old 01-12-2019, 08:41 AM - Thread Starter
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I took the data from dayton audio data files. I will try your tips! I thougt i could just make a 10l closed box in the 3way box.

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post #4 of 12 Old 01-12-2019, 08:55 AM
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Your tweeter filter looks ok to me. But definitely get rid of that 82uF and 3mH filter. That’s impedance compensation and it’s a waste.

Also, if using a mini dsp why the passive XO? Is the mini dsp just to cross to the 12” woofers you mentioned?

Sorry for the slow reply. I’m ImpulseAudio and you commented on my vid. Just got here.

My youtube channel: Impulse Audio
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post #5 of 12 Old 01-12-2019, 09:19 AM - Thread Starter
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Hi! Now im runing tempest 12 from diysoundgroup, a strange Russian tube amp, a big box with a jbl 2242hpl. I use the mini dsp to run dirac and cross the sub with the tempest. My goal is to integrate the two dayton drivers with the 12" i have lying around passive. Heres the spec i found on the 12":
Impedans: 8 Ohm
Frekvensomfång: 28-4000 Hz
Effekt: 150 W
Känslighet: 93 dB/SPL
Resonansfrekvens: 30 Hz
Vas: 140 L
Qts: 0.37
Yttermått: Ø 306 mm
Monteringshål: Ø 275 mm
Vikt: 2.5 Kg

I mean i could use the mini dsp to make som near field messurements, so I know that im on the right way. A big part of this project is that i want to learn how to/not how to make a good crossover. Thank you all for Helping me! im open for all sugestions!

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Last edited by muppjacob; 01-12-2019 at 10:24 AM.
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post #6 of 12 Old 01-12-2019, 09:58 AM - Thread Starter
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heres atempt nr2, this filter was hard to get flat
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post #7 of 12 Old 01-12-2019, 10:04 AM - Thread Starter
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is this ok? the impedance went down a bit though..
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post #8 of 12 Old 01-12-2019, 10:17 AM - Thread Starter
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or maybe this?
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post #9 of 12 Old 01-13-2019, 07:47 AM
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You’re on the right track. Only thing I would suggest now is to look at my last video about baffle step loss. The Dayton measurements you’re using don’t include those. So the simulation you’ve done will actually slope down towards the bass region in real life depending on how wide your baffle is. So you may want to lower the tweeter a bit and increase the inductor on the woofer to get a bit of a downslope in this xsim program. Then it’ll be more natural in real life and flat in real measurements.
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My youtube channel: Impulse Audio
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post #10 of 12 Old 01-13-2019, 08:45 AM - Thread Starter
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Okej, i have seen all your videos atleast one time is the crossover in #7 ok to use as base for the mod? The other ones dont let me pad the tweeter. The baffle will be atleast 14" (35cm) wide. I thougt ill putt the tweeter and midrange on the side of the baffle. You said in one of the videos that it has some advanteges. Something about diffractions? How wold you solve the crossover to the bas speaker? All info i got is above. Maybe just make a simple 1th order crossover until i buy the speaker value box you use?

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post #11 of 12 Old 01-13-2019, 09:04 AM
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Oh right you’ll be crossing to a bass woofer. You are probably ok to proceed. I’m assuming you’re not looking for perfection here and willing to tweak as you go a little? You last XO post looks the best so far.

My youtube channel: Impulse Audio
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post #12 of 12 Old 01-13-2019, 01:42 PM - Thread Starter
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Thanks for the input and patience! Im starting to see double here the filter gets crayzier and crayzier, i then start to remove stuff. Once in awhile it looks ok. I have attached two crossover designs. I also found a woofer that matches ok, i tryed to impliment that into the design. Im in this cause its a hobby, if the looong road ends in perfection thats nice Here is the kind of similar woofer and mine:

DSA315-8 (in crossover design):
vas:147
qts:0,33
8ohm

response tw1251(my woofer):
vas:140
qts0,37
8ohm
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Last edited by muppjacob; 01-13-2019 at 03:47 PM.
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