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In the Forum: Audio Discussions
In the Thread: Constructing LF modules to the limits
Post Subject: Stacked bass modules from a practitionerPosted by oxric on: 9/24/2011
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 Jorge wrote:
I will be dubiuos about the slanted enclosure if not done properly,  all drivers must be time aligned and since they are playing the same frequency, deficiencies in time alignment become more obvious.  I made a slanted enclosure but with the drivers facing forward, that is: out of alignment completely,  you can imagine how bad they sounded!
With the configuration you propose all drivers will be aligned and will shoot at an angle to the floor,  for the frequencies under 20 hz I hardly think this will be a problem, actually it might be even better.  For crossing at 100 hz its a whole different story...

I think one of the most important things about the lower channels is amplification and GAIN! The horn channels are too sensitive,  if we use 88 db woofers even in a huge array, lowering the volume on the horns wont really help in matching volume with the right tone and dinamic size,  more gain is needed for the bass array,  I like gargantuan gain for bass channels!


Hi Jorge,

My understanding is that standing waves inside the cabinet are driven more strongly when close to interior walls or other boundaries, in this case the floors when the drivers are firing directly at them from fairly close up in the slanted enclosure. Those standing waves can be minismised by either using appropriate strategic bracing, non-parallel walls or the golden ratios or a combination of all these.

It is interesting and pertinent that the solution your company proposes adopts one last solution, which is the use of separate individual modules, albeit that the cylindrical shape also ensures no parallel walls and you presumably use padding or a dome shape 'end' to further reduce these issues.

I refer back to your website where one can see pictures of your stacked and modular bass modules.

http://sadurniacoustics.com/bassmodule.html

I have liked the design and appearance of these from the very first time I saw them (as well as the rest of your acoustic system). They are very close to what I have in mind if I were to use multiples of 10" drivers, although I was thinking of being lazy and having two drivers per module, which in my case translates to less cost. It would be interesting to learn more about the drivers you decided to use, how you came to select them and what generally you think is the result of adding more modules and when one reaches the point of diminishing returns.

Best regards
Rakesh


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