 Digging out the old (?) ART array - some questions [message #81693] |
Mon, 30 November 2015 11:04  |
Rolf
Messages: 3
Registered: November 2015
Location: Kenya
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Esquire |
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Dear all,
greetings to all of you from Kenya.
I just registered to find out more about the 2009 ART array speaker.
...the ones explained in detail here:
http://audioroundtable.com/GroupBuild/Projects/
...and with nice photos here: https://fredt300b.smugmug.com/Hobbies/The-ART-Arrays/i-Hhp7hL9
I actually think I read quite a bit about it, including the long debate at http://techtalk.parts-express.com/showthread.php?209376-ART-com-line-array
AND, most importantly, I already bought the 16 Dayton DC130BS-8 
Rather than building/using passive crossovers, I am planning to use - for the time being - an active solution. I own a nanoAVR-HD from miniDSP, which should do the trick.
Before starting to build the speakers, I would however like to clarify a few issues, hoping that some of you were involved in the making and still remember these details - maybe Scott Placke is still around?
First of all, the arrangement of the woofers on the baffle. I assume they were deliberately moved slightly to one side, to minimize baffle-step issues. But were these really serious?
If not, then I would prefer centering the speakers vertically.
Secondly, the dimensions of the port tubes: these ought to be 4'' diameter and 4-3/8" length resulting in a 49 Hz tuning frequency. Typing these dimensions and the enclosure volume (~14.5 liters per woofer) into a standard tuning frequency calculator (I am using the German program Boxsim), results in a much higher tuning frequency, namely something around 70 Hz.
Anything that I am overlooking here?
I would appreciate very much hearing back from you.
Best regards,
Rolf
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| Re: Digging out the old (?) ART array - some questions [message #81712 is a reply to message #81711] |
Thu, 03 December 2015 10:06  |
Rolf
Messages: 3
Registered: November 2015
Location: Kenya
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Esquire |
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Thank you, Wayne.
I will do.
In the meantime I have figured out my mistake when calculating the resonance frequency of the port tube.
One needs to use the entire chamber volume (not dividing this by four, as I earlier did) and the equivalent volume (Vas) equal four times the single Vas.
Then the calculation matches that published by the builders of this speaker.
Once ready, I will post some photos.
Best regards,
Rolf
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