Am I on the right track? Bookshelf speaker Fountek FW146 / Dayton DC28F

[Jeff B.]

Yes. My programs will not run in a 64 bit application with issues. You can thank Microsoft for that.

[wogg]

Yes I was running Excel in 64-bit. Dug out my old copy of Excel 32-bit and that did the trick.. no more error messages.

Awesome! Glad I could help.

You fixed it before I could post this... but I saved the screenshot so I'm putting it up

[WernerM]

I once asked about running 64 bit vs 32 bit and was told that 64 bit was not compatible. Sorry I didn't think of it to mention it sooner. Anyway good luck and have fun. I look forward to the new results.

[crossbound]

Thanks for all the input guys..
Got to play around a little today in Response Modeler. Took my time to go through Paul Carmody's instructions and created all the necessary files. I get a decent response curve now with the Tweeter polarity switched, but the phase is all wacky.. I went through Paul's steps several times just to makes sure I did everything correctly. Attached are two response curves one with normal polarity on the tweeter and one with the polarity switched. Also the new crossover circuit is attached.

[isaeagle4031]

Try raising the tweeter crossover up a bit and moving the resistor after the filter.

[rpb]

Thanks for all the input guys..
Got to play around a little today in Response Modeler. Took my time to go through Paul Carmody's instructions and created all the necessary files. I get a decent response curve now with the Tweeter polarity switched, but the phase is all wacky.. I went through Paul's steps several times just to makes sure I did everything correctly. Attached are two response curves one with normal polarity on the tweeter and one with the polarity switched. Also the new crossover circuit is attached.

Eliminate the tweeter dip between 2k and 4k, and the summation will be much improved. The shape of the tweeter roll off is important. Use the target response curve, and try to match it as close as possible. The woofer looks good, so for the time being, leave it alone.

Try a 6 ohm resistor across the tweeter terminals. Drop your 12 ohm resistor down to about 3 ohms, and then play with the cap, and coil values. Get the shape right, then adjust the level.
You might relocate the 3 ohm resistor so that it's after the x-over. It might work better there, or it might not. It's good to try both locations as you work.

[filmslayer]

Eliminate the tweeter dip between 2k and 4k, and the summation will be much improved. The woofer looks good, so for the time being, leave it alone.

Try a 6 ohm resistor across the tweeter terminals. Drop your 12 ohm resistor down to about 3 ohms, and then play with the cap, and coil values.

i think its to low for the "silky" , i crossed it at 1300 to a RS225 and it worked , but that was pushing it !

[rpb]

I downloaded the files, and simmed a 2k tweeter filter with PCD. That tweeter needs a lot of padding. I'll post the sim if you want, but if you'd rather just have some hints, then here's a few.
These are not the exact values I used, but they should get you in the ballpark.
Put 2 ohms across the tweeter terminals...................Edit......this is too much padding. Try 6 ohms as previously suggested.
Put 3 ohms after the x-over, and 2 ohms before the x-over.
Now try a 3rd order filter, ie a cap, a coil, then another cap.

[crossbound]

Thanks rpb,
I want to try a little more myself. Just so I can learn to understand what happens. I'll let you know when I'm ready to give up.. :-) I'll definitely work with the hints you shared

[WernerM]

Can you share the FRD and ZMA files you are using?

[crossbound]

Sure can Marc.. here you go
https://dl.dropboxusercontent.com/u/.../SPLandIMP.zip

[rpb]

Are you using the targets? What order x-over are you planing? I was assuming fourth order, but after looking at your graphs, it looks like the woofer roll off is 12 dB. What range of x-over frequencies do you have in mind?

I changed my resistor suggestion after using your measurements. Six ohms across the tweeter should work pretty well along with some resistance before, and/ or after the x-over.

[crossbound]

I was looking at 1800-2000. My last crossover circuit I tried to simplify to end up with 2nd order. Looked at it briefly last night but wasn't satisfied with the result. Will post something later today

[WernerM]

What are your measurements, Baffle size and driver placement...

[crossbound]

Baffle size is 7.5x12.75
Woofer is 4.5 inches from the bottom and the tweeter 9.25 inches from the bottom
Internal volume is at around 10liters (drivers and port displacement already subtracted) tuned to 49Hz