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Multi-Way Conventional loudspeakers with crossovers

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Old 24th January 2013, 09:08 AM   #61
lolo is offline lolo  France
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great, thanks!
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Old 3rd March 2013, 03:52 PM   #62
Tytte71 is offline Tytte71  Norway
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Thanks a lot for sharing your great and innovative project. I find the concept especially interesting with regards to controlling directivity in the mid and lower highs. Therefore I would highly appreciate if you could provide me with some more details.

- Could you please show us pics of the damping inside the frames and what kind of damping material is used?
- Can you provide us with some FR measurements showing 90-180deg as well?
- How is power handling of the system... I'm especially interested in power handling of the full-range driver. I expect the power handling of the woofer to be rather limited
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Old 4th March 2013, 03:28 AM   #63
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Hey Oystein,

-I would rather not take the drivers out again because I used MDF and its cracking. I was going to do my next one with BB. But, I just used the grey packing foam, just 3/4" deep and about 1/2" wide, just enough to seal it loosly.

-I showed 90 degree FR with the rest of them, I will do 180 for you in a couple of days...I'm working constaintly these days, It's very busy in florida right now.

-Power handling is limited by bass down to 40Hz about 80db before botoming out. For the full range unit, I have it crossed at 450Hz 3rd order acoustic. They barely move at 80db...just vibrating. Ive tried them crossed at 300Hz they did about 2mm excursion 1 way at 80db.

So, that's about it. I will try to get that measurement in a couple of days.
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Old 4th March 2013, 03:30 AM   #64
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Here is the foam. The grey stuff.

Click the image to open in full size.

And here is my little doggie...Chilly

Click the image to open in full size.
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Old 4th March 2013, 11:38 PM   #65
Tytte71 is offline Tytte71  Norway
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Thanks for the reply!
I do fully understand your reluctance for opening the speakers. I'm perfectly fine with your description and pics of the foam.

I'm very exited to see the 90-180 deg measurements.

Nice puppy btw
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Old 5th March 2013, 04:58 AM   #66
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Hey Oystein.....
I said I already showed 90 degrees.
See, the last graph...the red line.

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Old 5th March 2013, 10:30 AM   #67
Tytte71 is offline Tytte71  Norway
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Quote:
Originally Posted by Melo theory View Post
Hey Oystein.....
I said I already showed 90 degrees.
See, the last graph...the red line.

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Sorry for being blurry in my question. When I wrote 90-180 I meant the span from 90 to 180 degrees like your 0-90 measurements. I'm curious to see the lobing (if any) at the back half of the speaker. The 90deg measurement is already noted
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Old 5th March 2013, 05:26 PM   #68
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Haha! Ok. I get it. That would be the most complete polar of all time! : D
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Old 5th March 2013, 09:32 PM   #69
Tytte71 is offline Tytte71  Norway
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Maybe Don't know if you have looked into Keyser's cardioid project. IMO that project is quite similar to yours although he have used compression driver with WG in the highs. You will see the dispersion pattern from 0-180 degrees in post 6 - quite impressive i think.
I find your approach with the dispersion of the fullrange driver very interesting with regards to wife friendly speaker designs
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Old 28th March 2014, 05:48 AM   #70
xrk971 is offline xrk971  United States
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Melo Theory,
Nice project and what a cool idea to get side nulls so that the desk and monitor don't mess things up. Those are some great freq response plots. Were the measurements taken at the desk position? If so that is great because you avoided the desk surface bounce cancellation that causes a dip at about 150 to 200 Hz for all other normal desktop speakers.
This has me thinking now. I will probably use a tc9 on top and the PE buyout 6.5 in polycone woofer on the bottom.
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