How to Design a Crossover - Part 7 - Calculating Phase

[@ReferenceFidelityComponents]

Note that increasing crossover frequency increases the waist in polar response beteeen midwoofer and tweeter and this can significantly affect field lobing pattern and directivity. Polar response needs to be part of the crossover frequency consideration. You also do not have to alter steepness of slopes to get things close to in phase but it can help by virtue of reducing crossover bandwidth. Playing with individual reactive component values can also fine tune phase providing that they don't mess up summation.

[@reyestrada3295]

Sincere thanks for all the effort you've into all these videos for the sake of sharing. I've actually followed and studied all and have now come to the point of having a design, and phased. So, what is next? Box design? Hoping to have your valued assistance. Thanks in advance.

[@correia707]

Very nice information, thanks!! It's amazing how crossovers are so very important on the sound of a speaker.. I presume even more important than the speaker itself (woofer and tweeter)

[@Toid]

It makes all the difference in the world :)

[@rubickon]

been waiting for the seventh part!! thanks. will see it at the evening

[@Toid]

You're welcome! Enjoy!

[@hechunouyang7045]

Hello, I really thank you for making these videos. They've basically taught me everything I know about speaker building. I was wondering, for the Offsets, whether they're center to center or side to side. Thanks!

[@Toid]

Great question. It should be center to center.

[@notanyonefamous6585]

Many thanks for the series, I feel I know more about crossovers having watched them and might even attempt building one once I've watched the next video that shows you building it. 1 question: what about the impedance of the speaker? the first few videos you were showing a 4ohm woofer and 4 ohm tweeter...are they connected in series somehow in order to end up with an 8ohm total package? Many thanks for the info.

[@Toid]

That is a great question. The impedance of the speaker is determined by the impedance of the woofer. So in the case of using a 4ohm woofer and a 4 ohm tweeter would still make this a 4ohm nominal speaker. That would stay the same if I used an 8 ohm or even a 6 ohm tweeter. A few ways to increase that speaker to 8 ohm would be to wire another 4 ohm woofer in series or to use an 8 ohm woofer.

[@notanyonefamous6585]

Thanks for the reply. So the tweeter has no impact on the impedance of the speaker, does the number of drivers impact the crossover? Last question I promise...when combing multiple woofers are there pros/cons to using 2 x 4ohm speakers in series vs 2 x 16ohm drivers in parallel?

[@Toid]

That is correct. The number of drivers will impact the crossover in a few ways. First is the BSC, will only need to be compensated about 3db instead of the normal 6db (assuming full BSC correction). it also affects how the drivers mesh when being crossed over. It also changes the crossover components, as you would now have a different impedance. Finally, there is not pro or cons between combining either 2 4ohm or 2 16ohm drivers. The difference really comes into box design and desired frequency response. So whichever work better for your design, is what you should do.

[@Toid]

I just made a video about MTM's, I hope this helps you out: kzbin.info/www/bejne/eZWplZeclKeMhrc

[@Voidhawk001]

Hi 123toid my phase lines on the graph seem to be very messy and are not as clear as you have in this video. Should i be looking at the phase.just.in the crossover points? Also what is the phase that is shown in the "Filter transfer function" graph? Thanks

[@ИванПронин-о1ю]

you cannot download the program from the link, the file is infected with a virus( Will you make your link to a verified fi?

[@גדאור-ג7ע]

hi im using a 24db l.r crossover which was said to be the best in terms of phase but it dose not make sense to me bc the tw sound ;reach my ears sooner then the woofer ...the fs look nice and flat but im sure im not time correct is ther a way to deal with the issue?

[@Toid]

גד אור You need to change the spacing of the drivers and or crossover frequency. You may need to change the values of the components. But if you mess around with it, you should be able to get the phase to align.

[@גדאור-ג7ע]

thx my friend but what do you mean cange the spacing its a big home loudspeaker i cant move the tw back

[@גדאור-ג7ע]

and its active crossover i cant change components

[@Toid]

גד אור The space between the Tweeter and the woofer. Mine then closer together. I am assuming you are designing these speakers. If these are manufactured, something else is going on

[@גדאור-ג7ע]

its 3 way closer to the mid but its too late but thanks anyway

[@HowDareYouu]

u should follow up with the real build with the real parts and explain from where u find them & how u choose them

[@Toid]

I plan to do that on my next big build. Stay tuned

[@Toid]

I jsut did that in my last video. Well I show you how to get Z-offset using real measurements which helps you with phase

[@m0329b]

i didn't get it really, whats phase? say something or this blue lines why one is better than other, you know i get it. (like when this blue (phase lines showed up, you said: oh its not so good but tell us why, and how, where did you noticed that cancellation

[@Toid]

Thanks for the input John. I guess it's hard for me to explain that without showing the speaker that was in phase. So when it is in-phase you can see less dips and peaks and more of a flat line. I should have explained more about the dips and peaks and how we were trying to flatten that out. That's great input and I really appreciate it.

[@m0329b]

z offset is important for phase

[@m0329b]

previous videos was great tho

[@ismaelyu5]

I like the explanation, but it's hard to see anything.

[@laszlosarkozi1021]

This part was almost useless... I learnt basically nothing about phase and design a crossover for phase...