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Multi-Way Conventional loudspeakers with crossovers

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Old 6th January 2013, 05:45 PM   #11
ODougbo is offline ODougbo  United States
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I'm not sure where that plot came from - that's what the bass curve looks like - exactly!
The box is tuned to 51-52hz.

I went and looked at a 3rd order Butterworth circuit, typical it has two coils, so a little confused there.

I had a pair or clarity caps 3.9 (vs. 4.7uF), so slipped them for the tweeter(s) - a whole sweeter!
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Old 7th January 2013, 07:55 AM   #12
ODougbo is offline ODougbo  United States
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I'll bump up the 1.1mh coil to 1.5mh (wire-n-shrink wrap tape) and use the 12.cap across the woofer.

The speakers are interesting - super clear sounding, good imaging, killer bass!
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Old 7th January 2013, 08:54 PM   #13
ODougbo is offline ODougbo  United States
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I added wire to the 1.1mh coils, now 1.5mf and added the 12uf cap.

Much better - the woofers were overbearing, now much quieter.

I'll find somebody to measure the response - I'll get there someday also

added construction pic.




Quote:
Originally Posted by Dissi View Post
The baffle step causes a rising frequency response in the midrange and demands a larger coil to compensate. According to a simulation 1.5 mH and 12 uF could work. The target function is a 3rd order Butterworth low-pass filter having -6 dB at 2.2 kHz:

Attachment 321894
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Last edited by ODougbo; 7th January 2013 at 09:05 PM.
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Old 7th January 2013, 09:18 PM   #14
tvrgeek is offline tvrgeek  United States
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No other option: Let's put that Panasonic mic to work and see what is happening! I should have the parts to make the reference probe that will be good enough with ARTA.
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Old 7th January 2013, 09:27 PM   #15
ODougbo is offline ODougbo  United States
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I'll take you up on that offer.

Was just checking around for new tweeters - these are interesting:
89db - 8ohm - good price.

Morel MDT 12 1-1/8" Neodymium Tweeter 277-060
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Old 8th January 2013, 07:30 AM   #16
ODougbo is offline ODougbo  United States
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DIY fellow sent this link - this xo may be direction to head.

The midbass(s) are similar and I have the tweeters.

Vifa PL14WJ-
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Old 9th January 2013, 09:33 AM   #17
ODougbo is offline ODougbo  United States
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Maybe time to LEAP into action:

Crossover Design: The Madisound Speaker Store

Yes persistence - these boxes have HUGE, bigger than life sound!
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Last edited by ODougbo; 9th January 2013 at 09:42 AM.
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Old 9th January 2013, 10:23 AM   #18
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That is an option, but maybe you should wait till you can do some acoustic measurements of your own and see what you can come up with. You are on the right track, so if you keep it up I'm sure you will at the very least learn something, and hopefully come up with something that you are very happy with as well!

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Old 10th January 2013, 12:33 AM   #19
ODougbo is offline ODougbo  United States
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I have a buddy coming over to help set up ARTA (and have mic).

Q. I'll need to pad the tweeter down; would I add the l-pad right at the tweeter or change a resistor?
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Old 11th January 2013, 09:54 PM   #20
ODougbo is offline ODougbo  United States
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Sounds great so far - balanced, nice tone.

I can't believe a 5" driver can vibrate the floor (and they are on stands).
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File Type: jpg Vifa and XT25.jpg (71.8 KB, 187 views)
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