Speaker Measurements And Polarity Changes
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- Опубликовано: 5 окт 2024
- After going through the latest measurements after tweaking the crossover, I've noticed a few dips that I think are caused by me adding the 3rd speaker and not redesigning the crossover. 2 speakers are apart from each other causing noise canceling of the other.
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I respect your efforts. I also started this hobby from 2018 but learning very slowly. I suggest you invest in something like minidsp and see in real-time what phase and crossover s can do to help. Passive in mains with active in woofers or subwoofer is better idea in my humble opinion. Speaker spacing is also a big concern, get the woofer and tweeter in close proximity. Try filling the boxes with Rockwool or pillow stuffing ,or you can even try to seal them to see you can mitigate that dip in the response. Speaker boundary response is also a reason for this kind of dips. Standing waves inside cabinet is also can be a reason. Play with Speaker position and remessure. I really salute your efforts and your approach. Me also a learner like you. Best of luck.
I've thought about mini dsp, I might experiment with active in the future. You're right about needing some stuffing in the speaker boxes as well, they could use something, spacing should be closer as well. Only time will tell where this ends up. Thanks for the feedback, I appreciate it.
Haven't seen your crossovers but you are on the right track , Ive have 3 setups the use various types of phase cancelation or adjustment
I'll go through my proposed changes in the next video, let me know if you have some tips. Appreciate you letting me know I'm on the right track.
I think the issue is "time alignment". Assuming the sound originates where the cone/diaphragm attaches to the voice coil former, the drivers have to be compensated with time delay so that they are all eminating from the same vertical plane. There is a feature in x sim to add time delay when "tuning" a driver. I found that you must select "derived" to activate this function. For now I'm going to try measuring the relative distance difference from the tech drawings in the driver spec sheets to provide the time delay in inches. I'm not sure if it should be a positive or negative number. I think positive. I will be trying this hopefully later today. I think this measurement can be better accomplished with an omni mic and software but I don't have that or the drivers yet. I would like to see great results in x sim before I purchase drivers. Then I suppose the drivers will need to be mounted with the cones time aligned. When the frd/zma files are measured, that information is collected with their normal distance to the baffle board. I think you can achieve good results when ignoring time alignment BUT it will require a more complicated crossover to hopefully make it happen and then the drivers could simply be mounted on the same vertical plan I think. 🤓
Any further developments you learn would be appreciated in a reply. Greatly appreciate your content on RUclips! Thanks Vincent
This was a while back since I did this so I'll do my best to recall what was going on. Since I have the drivers in question in different boxes I was able to move them and check time alignment. It didn't change the resulting measurement pointing back to phase. There might be more to time alignment that you're referring to that I don't understand which is highly possible. The icing on the cake at this present time is I have a phase problem with my subwoofer at the present time. You can switch the phase on the subwoofer, but the kicker, in one phase it cancels audio from the lowest speaker, in the other phase it cancels some audio from the bottom range of the mid. I've managed to adjust in the eq to a tolerable point.
I'm glad you like the channel, it's been a while since I've posted, there are plans for the new year. I'm still active!
I also suggest get dayton dats measuring system to get the zma files. Your box response is fifferent then the manufacturer specs in my humble opinion
I've tried to get one a few times, the supplier's in Canada all seem to be short at the present time. Future projects will have me measuring I'm thinking once I can get a dats.
I've got the kind of the same issue , with 2way speakers , I've put one sub to mitigate that with the sub in the middle, and the cross over a bit more than 80hz , meybe if you put the speaker a bit outside the wall helps to
Thanks for the ideas. I never thought about moving the speaker farther from the wall. I think you're right about the cross over frequency being higher as well.
@@davewiebespeakerdesign let me know if helped with that , thanks
It's normal to need to change phase in that setup