PLEASE HELP With Crossover design
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Hello,
Let me introduce myself. My name is Eliot. I’m fairly new to speaker building and could use some help. Ive built a few speakers in the past but they have been from kits or inspired buy someone else’s build plans.
I want to take my skills to the next level and tackle a complete build designed by myself. The issue I’m having trouble with is the crossover design. I have watched Toids Passive Crossover Designer Youtube tutorial videos among other research and they have been a HUGE help.
The speakers I am building are going to be a powered two-way bookshelf/desktop system. The drivers I have chosen are both Dayton Audio. I’m using the RS125P-4 5″ woofer and either the ND25FA-4 1″ tweeter or the DSN25F-4 1″ tweeter. Ill be powering the speakers with an Arylic plate amp but I don’t want to use DSP for this build.
Ive designed preliminary crossover designs for both tweeters mentioned above. Both are second order designs and have a frequency response variation of 3db, which is good enough for me.
The thing I am having issues with is PHASE. I just don’t think I’m understanding it quite yet.
FIRST CHOICE: The ND25FA-4 is my first tweeter choice and the crossover response is pretty flat. I’m crossing the speakers at aboout 3400hz and using a second order filter. However, no matter what I do I cant seem to get the phase to line up. When I reverse the tweeter polarity I’m not getting the nice “V shape” you’re looking for. How big of an issue is this? How can I solve this problem. Some of the component values have been slightly altered based on purchasing availability.
Here are some screenshots:
Reversed Polarity:
Phase and Total Phase Graphs
SECOND CHOICE: My second option is using the DSN25F-4 tweeter. This is also a second order filter, but crossing over at 4700hz. This also has a fairly flat response and when viewing the phase it does line up pretty close and I’m getting that “V shape” when reversing the tweeter polarity. Does this design look OK? I would much rather make the ND25FA-4 tweeter work for cosmetic reasons, but if this has a better design result I’ll use it. I don’t want to sacrifice quality for cosmetics. Some of the component values have also been slightly altered based on purchasing availability.
Here are some screenshots:
Reversed Polarity:
Phase and Total Phase
Please advise how I can solve the phase issue with the ND25FA-4 tweeter, or if I should even worry about it. I should mention I do not have testing equipment yet so maybe I’m stressing over something that I can’t control or won’t matter after the speaker is built.
Which tweeter design do you think is the best? Which one should I use? Is there anything you would change in the crossover designs? Any input would be very helpful.
Thank you! Thank You! Thank You!
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