2-way crossover design review

[AcousticsCam]

Hi all,

Giving myself a crash-course in loudspeaker design to help pass the time during lock-down. Started off browsing the literature, although I've now committed to build my own 😕.

I'm attempting to design my first 2-way crossover using X-Sim, and while on the surface it seems semi straight-forward, i appreciate there's probably a lot of nuisances in the design that I'm overlooking. Therefore, if anyone has a minute to cast their experienced eyes over my design, that'd be massively appreciated.

The 2x drivers I'm planning on using are the SB Acoustics 6.5" Satori mid-woofer MW16P-8 and the Satori TW29RN-B Tweeter (i cant explain why i chose drivers with different impedances, but ill stick with it unless someone gives me a good reason to change)

I've attached the X-sim frequency & impedance responses and single line drawing of the designed crossover.

My main concerns pertain to the Impedance chart and adjusting phase.

Thanks in advance!
Cam

 

[bogdan_borko]

Hi all,

Giving myself a crash-course in loudspeaker design to help pass the time during lock-down. Started off browsing the literature, although I've now committed to build my own 😕.

I'm attempting to design my first 2-way crossover using X-Sim, and while on the surface it seems semi straight-forward, i appreciate there's probably a lot of nuisances in the design that I'm overlooking. Therefore, if anyone has a minute to cast their experienced eyes over my design, that'd be massively appreciated.

The 2x drivers I'm planning on using are the SB Acoustics 6.5" Satori mid-woofer MW16P-8 and the Satori TW29RN-B Tweeter (i cant explain why i chose drivers with different impedances, but ill stick with it unless someone gives me a good reason to change)

I've attached the X-sim frequency & impedance responses and single line drawing of the designed crossover.

My main concerns pertain to the Impedance chart and adjusting phase.

Thanks in advance!
Cam

There is problem with low impedance, about 2 ohms and almost 0 ohm at about 22Hz. Try higher values for tweeter L pad(R1, R2) , higher L1, lower C1...

 

[rayma]

Try to keep the impedance always above 6R.

 

[PRR]

There is problem with low impedance, about 2 ohms and almost 0 ohm at about 22Hz....

That's got to be a glitch. There is nothing in there to resonate at 22Hz. (0.39mH + 27uFd is like 1.5 kHz.) A six-inch speaker would not be tuned to 22Hz. The phase curve shows no hint of slope until it blows-up at 22Hz. This is bogus.

 

[AcousticsCam]

Try to keep the impedance always above 6R.

Thanks everyone for the quick responses! On this point, do you mean that the impedance of the entire frequency spectrum is kept above 6? And the phase should ideally be as flat as possible?

Thanks!