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Multi-Way Conventional loudspeakers with crossovers

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Old 29th April 2004, 08:55 PM   #301
johninCR is offline johninCR  United States
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In a 3way OB setup, is it necessary to isolate the bass driver? If so, how deep should the separating board go?

I ask this because I had a few different drivers on a test baffle to get a feel for their bass response. I connected 1 at a time, but realized that during the test the unconnected driver cones vibrated quite alot. I had to put boards over them because they changed the response. That made me think what kind pressures are put on the midranges while everything is in use and maybe go unnoticed.
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Old 29th January 2006, 04:24 PM   #302
talatnat is offline talatnat  Thailand
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Default The X-baffle (OB) spreadsheet

I was running some numbers through the spreadsheet, and am hoping somebody could clarify a momentary point of confusion:

Are the distances from the 1) floor 2) back wall 3) and side wall measured from the driver's center or from the edges of the baffle itself? It's not clear in the spreadsheet's wording, especially since one has to specify the baffle dimensions prior to inputting these distance parameters.

One might presume it's from the edges of baffle, but then what if one added wings (as the OP did), or angled the baffle surface up or down? Also, if one were to hang a long OB hanging equidistantly (or not) from the ceiling and the floor, is it possible to account for the effects of the second surface (either ceiling or floor, since we specify only one distance in the spreadsheet)?

I'm dense, and sorta baffled.

Thanks in advance.
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Old 29th January 2006, 05:57 PM   #303
Rudolf is offline Rudolf  Germany
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All those distances are for the driver. The calculations regarding the side wall distance will be severly compromised if you add folded back wings. Rear distance will work everytime. Hight above floor assumes the OB standing on the floor. Lifting it up will be a completely different set.

All IMHO.

Rudolf
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Old 19th March 2006, 08:40 AM   #304
peterbrorsson is offline peterbrorsson  Sweden
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Hi, for those that haven't got woodworking abilities, check this out for baffles. Sold beech with an oil treatment!!

Cheers

http://www.ikea.com/webapp/wcs/store...64*16225*15876
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Old 19th March 2006, 10:20 AM   #305
Landroval is offline Landroval  Finland
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And this:
http://www.ikea.com/webapp/wcs/store...00*16476*16477

The edge reflections wont be a problem because of the shape
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Old 19th March 2006, 01:46 PM   #306
MBK is offline MBK  Singapore
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They have a couch (coffee) table too (couldn't find it on the swedisch site, here from the Singapore site ) that would fit perfectly.

The parts are bent plywood, as for a folded baffle, with wide radius, and size is almost perfect.
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Old 20th March 2006, 08:26 PM   #307
peterbrorsson is offline peterbrorsson  Sweden
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HI,
These speakers could be interesting in an open baffle. Tommy,from Hifi Kit, said he doesn't have X-max or freq. response
but for this price, there might be a possibility for me to try them. If time allows
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Old 25th March 2006, 06:40 PM   #308
peterbrorsson is offline peterbrorsson  Sweden
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Hmm, it seems that it is not possible to attach the web page. Search for www.hifikit.se and Rila BW1202



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Old 19th March 2009, 04:16 PM   #309
Telstar is offline Telstar  Italy
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Quote:
Originally posted by Kuei Yang Wang

I believe the biggest problems with open baffles are peoples prejudices and stupidity. As with all things that are problems, actually.
I had to requote this gem
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Old 24th August 2010, 03:03 PM   #310
ThorstenL is offline ThorstenL  Germany
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Folks,

Quote:
Originally Posted by catapult View Post
Got any measurement curves yet?
That was a question in around 2003 at the beginning of this meta thread directed at this speaker:

http://www.diyaudio.com/forums/multi...tml#post234860

Doing some ego browsing I noticed a review in a really odd corner of the web (Anandtech) by Rajinder Gill that included measurements of both the naked Baffles and of a system with a subwoofer.

The whole article is here and makes very interesting reading;

AnandTech.com - Audiophile Journeys with a PC

Included are the in-room responses of the open baffles (fitted C37 lacquered Supravox Bicone Signature Drivers) on their own, showing the naked in room response in that specific room:

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.


Please note that this response is not smoothed a lot and taken at a single point and includes the extra HF rolloff from a non-oversampling DDDAC with TDA1543 AND a Welborne Labs Yota 300B Amplifier.

For comparison here the responses of two expensive commercial speakers in one particular writers room with a fair bit of smoothing and spatial averaging (this was the first graph I found on SP's site, no specific criticism etc of the two speakers intended, just a comparison datapoint)...

Click the image to open in full size.

So anyway, now there are some measurements, thou maketh of them what what thy may.

Ciao T

Last edited by ThorstenL; 24th August 2010 at 03:08 PM.
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