With Linkwitz-Riley type filters yes, you need to match the phases to get flat frequency response with 6dB reinforcement at xo point, but with some others filters you can have a flat frequency response without exact phase-match of the drivers. Of course without exact phase-match, you cannot have 6dB reinforcement at xo point as you can see at post #37.
Theoretically with Linkwitz-Riley type filters you get dip in the power response at the crossover region. If this is good or not, that's a personal preference, but a dip is usually better than a peak in the response.
So with the OP's speaker, i would try to target a 4th order L-R response.
Some says a 2nd order L-R crossover is more lively, which is may be true, but one big advantage of the 4th order filter is that it's sounds cleaner in the tweeter-midrange region.
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You may only need 1 additional capacitor for the tweeter, that way you can tune close enough to LR4 imo. But if not, then not.
Making progress finally. Going to a 3rd order seemed to help. I spent an hour listening last night and the latest XO sounds better. I will post later, but the XO is not exactly as in my last post. Now I need to just sit and listen without changing anything and get familiar with it. The only thing that I am concerned with is the tweeter is second order and the woofer 3rd. I guess that cant be good for phase? (tweeter inverted)
Just do a reverse null-test gated measurement with the tweeter polarity flipped to get a picture about the phase.
I was thing more along the lines of general phase. (I get flat response and when I swap tweeter leads I get the deep null so I swap them back.
Hi niss man,
Sorry for not posting my results earlier but I had surgery so I have been away for awhile. I had to go to a third order on the mids that helped. I also had to make sure the lower one was XO at a lower Fr. I am still not well but I will post the XO soon. Also, I move the speaker location cloder to the wall and it is better. (it was 4.5 ft into room now it is 2.5 ft into room) The speakers sit too high so I have get some stands that put them about 2 ft off the floor.
OK so I am back, sort of. Since i had surgery I am limited to what I can do but I decided to go away from the 2 1/2 way and just do a straight MMT. I think it sounds better. Still have some tweaking but I'll live with it form awhile to get to know it.
That's good to hear. I hope your healing well after surgery. Make sure to have someone help with the heavy lifting if needed.
Thank you, yep no lifting for me since it was back surgery. I can play with crossovers all I want though lol.
Just curious. right now my MMT is sittting on a sub cabinet that is say 30" tall and the topper is 23" high. I think the topper is too high off the ground and should be on a stand say 18-22" off the ground. what do you think?
Usually people don't want to know what I think 😀
Isn't traditional rule for height of speaker to have tweeter level with listener's ears? So with usual seating position, perhaps 4 feet high?
Isn't traditional rule for height of speaker to have tweeter level with listener's ears? So with usual seating position, perhaps 4 feet high?
It wasn't to me until I didn't pronounce the L as Americans do. Then it became funny. In Australia and most other English speaking countries the L is pronounced. I am surprised it isn't spelt "soder" in an American English dictionary.
The tweeter height range I see usually recommended for a seated person is 35" to 38", so if you're suggesting it be 48", that would be too high (unless you're sitting on a bar stool 😉).
Paul
Paul
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