2-way enclosure with Monacor drivers

[ziocalepino]

Hi, I start here a new thread after the one about xover reverse engineering. I have these drivers: Monacor SP6-108PRO and Monacor AIRMT-85. I would like to obtain an enclosure similar to this:


18W-8434G00


In annex FRD and ZMA values for drivers. Please can you help me with xover and cabinet plans? Thanks.

 

[Ugg10]

As a quick check, if you put the speaker parameters into my-audio bass reflex calculator for an 18l box (as per the Troels link) then you get pretty much the same numbers as the 18w I.e. 18l box, 50mm diam x 95mm length port, f3 = 50hz with similar response curve.

Obviously you will need to design a crossover for your speakers (Troels one will not work) but the woofer in that box looks like it is not a million miles away.

 

[ziocalepino]

Thanks. A friend of mine has LSPCad. Maybe I'll try with this SW even if never used before by me.

 

[ernperkins]

I get the same values as Ugg10. With 10W you get 100 dB, but Xmax (3 mm) will be exceeded below 40 Hz (see attachment). You'll need a sub if you want a lot of low bass, but that's true of a lot of 6.5 in drivers.

 

[ernperkins]

As I mentioned in the previous thread I did find the FR and impedance graphs from Monacor. I converted them to .frd and .zma files and compared them to the files you provided. The woofer files match quite nicely except the Monacor file is about 2 dB higher than yours. The tweeter files don't match up as well, particularly at about 1250 Hz where the Monacor file shows a peak and your file shows a dip. Here are the two comparisons, Monacor files are in blue and your files are in red.

 

[ernperkins]

And here are the Monacor .frd and .zma files. IMO the Monacor tweeter file is a more typical infinite baffle response than the file you provided, but that's just my opinion.

 

[DonVK]

I'm assuming you did a curve trace for the SPL and ImpMag, but both files are missing the phase information column.

How / where are you getting phase ?

 

[ernperkins]

Don -
Yes, you can't get phase information from converting graphs. My plan is to add baffle step & diffraction effects (since we have cab dimensions and speaker positions), add high and low tails and then create minimum phase versions which will have the phase information. I also have a good estimate of the z-axis value which is the last item needed for the simulation.