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Multi-Way Conventional loudspeakers with crossovers

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Old 14th February 2018, 02:17 PM   #121
montana1 is offline montana1  United States
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Hi Lojzek,
I have attached zip file of Xsim dxo file as you requested. Hopefully, you are able to unzip file with no difficulty. I had to really compress file to not exceed servers maximum file size. Thanks so very much for taking a look to see if the design can be simplified.


Best Regards,
Rich
Attached Files
File Type: zip Omega1-standount.zip (541.1 KB, 8 views)
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Old 14th February 2018, 03:23 PM   #122
jReave is offline jReave  Canada
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Hi Rich,

Well, it more or less works but I think I'm with Lojzek - it could probably be simpler.

I guess 1st, considering your small room and starting with the full 6dB of bsc, I would make sure the level above about 1000Hz isn't sitting below the level below 1000Hz. Or in other words, I'm afraid that the balance in room might be just a tad heavy on the bass.

Also I'm trying to understand why you've decided to switch from 3rd order electrical with an added resistor and a tanking capacitor on the woofer to 1st order with 2 notch filters? That's a mite unconventional. But as I said, it does work.

But I still think that unless phase alignment just won't work, 2nd order electrical probably with a shunt resistor again to shape the knee and manipulate phase as well as the tanking capacitor aimed at about 3500Hz with a series resistor to modulate depth should do the trick. Less expensively too.
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Old 14th February 2018, 03:34 PM   #123
Lojzek is offline Lojzek  Croatia
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Thanks Rich, the will was there but the machine just wouldn't unzip it. I'll use the far field measurements of the drivers without near field and vent response that you posted already.
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Old 14th February 2018, 03:55 PM   #124
montana1 is offline montana1  United States
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Hi jReave,
TBH, I have tried so many different combinations that maybe I have lost sight of just keeping things simple. If memory serves me correctly, I was having trouble with phase alignment with all 3rd order electrical combinations on the woofer but 3rd order electrical on tweeter works great. I'm going to attach another try at this with regards to simplifying things as you and Lojzek have pointed out. With this version I tried the resistor plus capacitor tank on L1 but found the notch filter method seemed to worked a little better. Also, I included system z with and without impedance compensation filter before tweeter. I tried it after the Xover and it does nothing for lowering the impedance hump. With regards to balance, I may have to aim for a flatter response after reading your comments about maybe the system being bass heavy with full bsc in a small room. But, that is something I can tweak before purchasing any components if you and Lojzek think I'm on the right track.

Thanks once again,
Rich
Attached Images
File Type: jpg Omega-schematic.jpg (32.3 KB, 43 views)
File Type: jpg Omega-FR1.jpg (95.3 KB, 43 views)
File Type: jpg Omega-FR2.jpg (97.5 KB, 43 views)
File Type: jpg Omega-systemz1.jpg (87.5 KB, 43 views)
File Type: jpg Omega-systemz2.jpg (89.8 KB, 41 views)
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Old 14th February 2018, 05:30 PM   #125
montana1 is offline montana1  United States
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Hello Guys,
And another version to consider. What can I say it is snowing in north Idaho today. So, plenty of time to work on this design. This attempt is taking into account jReave's thoughts on a flatter response. Hopefully, there is no law against 3rd order electrical on both woofer and tweeter. I might have tried every conceivable combination known to man in an attempt to achieve a flat response and a 1.7k Xover point. What do you guys think?

Best Regards,
Rich
Attached Images
File Type: jpg Omega-schematic.jpg (31.5 KB, 12 views)
File Type: jpg Omega-FR1.jpg (96.2 KB, 14 views)
File Type: jpg Omega-FR2.jpg (98.4 KB, 13 views)
File Type: jpg Omega-sys-z.jpg (87.5 KB, 10 views)
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Old 14th February 2018, 06:45 PM   #126
montana1 is offline montana1  United States
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Hello Guys,
This attachment is the same design as from last post but values transferred over to PCD7.


Best,
Rich
Attached Images
File Type: png Omega-pcd_FR1.png (484.6 KB, 14 views)
File Type: png Omega-pcd_FR2.png (512.5 KB, 11 views)
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Old 14th February 2018, 07:04 PM   #127
Lojzek is offline Lojzek  Croatia
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Rich, would you try this one?


LP: 2.2 mH; 8.2 uF; 2nd order electrical
HP: 5.6 uF; 0.33 mH; 15 uF; 2.7 R; 3rd order electrical, resistor after HP
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Last edited by Lojzek; 14th February 2018 at 07:06 PM.
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Old 14th February 2018, 08:21 PM   #128
montana1 is offline montana1  United States
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Hi Lojzek,
Here is attachments of design based on the values you provided.

Thanks very much,
Rich
Attached Images
File Type: jpg omega-sch-v3.jpg (21.1 KB, 15 views)
File Type: jpg omega-FR-v3.jpg (98.4 KB, 17 views)
File Type: jpg omega-FR2-v3.jpg (98.6 KB, 19 views)
File Type: jpg omega-sys-z.jpg (88.5 KB, 14 views)
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Old 14th February 2018, 08:42 PM   #129
montana1 is offline montana1  United States
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Hi Lojzek,
What do you think of this version? I just added tank to L1 and changed C1 to 11uf in an attempt to align phase a little better. What would be nice about these designs is I have most all of the components already.


Thanks,
Rich
Attached Images
File Type: jpg omega-schm-V3jpg.jpg (23.4 KB, 15 views)
File Type: jpg omega-FR1-V3jpg.jpg (95.9 KB, 13 views)
File Type: jpg omega-FR2-V3jpg.jpg (96.0 KB, 13 views)
File Type: jpg omega-z-V3jpg.jpg (88.8 KB, 12 views)
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Old 14th February 2018, 08:57 PM   #130
Lojzek is offline Lojzek  Croatia
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That looks to me as a solid iteration of a filter that will bring you closer to your goal. If you already have the parts, all the better. Have fun, and later you can mod it further, if necessary.
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