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Multi-Way Conventional loudspeakers with crossovers

First 2 way speaker
First 2 way speaker
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Old 7th May 2021, 11:06 PM   #1
Kyrk is offline Kyrk  Greece
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Default First 2 way speaker

Hello,

This is my first time designing a two way speaker with bass reflex, I have made a couple of full-rangers in the past, but this is my first time trying to put together a crossover.

The drivers I am gonna use is a dayton audio TCP-115 4ohm and a dayton audio Dayton Audio ND25FA-4, in a 4 liter box with a slot port tuned at 57hz (i wanted to make it a bit smaller but i couldn't really.

The crossover is a 3-part one or the tweeter and a 2part one for the woofer. I am trying to keep cost down since i wouldn't want for the crossover to cost more than the drivers.

How does it look to you, should I change something? Would i need a baffle step correction filter ( baffle width is 20cm)?
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Old 7th May 2021, 11:08 PM   #2
Kyrk is offline Kyrk  Greece
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Old 7th May 2021, 11:17 PM   #3
AllenB is offline AllenB  Australia
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First 2 way speaker
Vituixcad does offer you the opportunity to simulate baffle effects. This will bring you much closer than guessing so I would recommend it in this case.

Also, I would change the vertical scale on the response plot.
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Old 7th May 2021, 11:23 PM   #4
Kyrk is offline Kyrk  Greece
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change the scale to what? Smaller so i can see more precise ? What about the circuit itself?
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Old 7th May 2021, 11:30 PM   #5
AllenB is offline AllenB  Australia
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First 2 way speaker
Where you use 10dB per major division I'd use between 1 and 5, depending what stage I was at.

Your circuit looks fairly standard, nothing much to say. Your values and your choice of how to filter the drivers is less clear but it does not look like a problem.
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Old 7th May 2021, 11:54 PM   #6
Kyrk is offline Kyrk  Greece
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Is there any substantial advantage of using something more "advance" circuit wise. I made some changes since baffle step effects seem to reinforce heavily the area between 1-2khz. My bigger worry is about phase, impedance and driver alignment problems, but i suppose they look ok.
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Last edited by Kyrk; 7th May 2021 at 11:57 PM.
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Old 8th May 2021, 12:12 AM   #7
AllenB is offline AllenB  Australia
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First 2 way speaker
Yes it looks OK. Since you are using the single measurement per driver style, it is difficult to say which way would be better with phase. It is difficult to say whether you will be happy, I would expect to do some tweaking.
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Old 8th May 2021, 12:17 AM   #8
Kyrk is offline Kyrk  Greece
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I am not really sure what you mean by "which way would be better" are you talking about inverting the polarity of the drivers ? What should I try to hear when evaluating the phase?
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Old 8th May 2021, 12:23 AM   #9
AllenB is offline AllenB  Australia
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First 2 way speaker
You should try to hear that the tone is balanced, that you have a clean connection between the drivers rather than a dip or a peak. This is not only because of the direct sound but also because of the reflected sound.
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Old 8th May 2021, 12:47 PM   #10
hifijim is offline hifijim  United States
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you have done a nice job on your crossover so far. It is not done, but you are getting closer.

I can not tell if you applied the diffraction response to the drivers in post #6, or are you simply showing the baffle diffraction effect?

If the diffraction effect has been applied, then the +3 dB rise in response at 100 - 200 Hz will give your speakers a pleasant warm quality.

If the diffraction effect has not been applied, this means you have only a 3 dB baffle step compensation. If speakers are placed near the rear wall, this may be enough, but if they are mounted out in the room (50 to 100 cm from a wall), they may sound too lean... meaning a lack of mid bass.

Have you accounted for the fact that the tweeter is somewhat closer to your ears than the woofer? probably 20 to 40 mm closer?

j.
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