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12 Volt system help needed (first build)
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Saturnus View Drop Down
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Points: 714 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Saturnus Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2012 at 3:37pm
Originally posted by slaz slaz wrote:

I don't doubt that its a good design - never heard one - but the weight ... don't think thats a bicycle-transported system - well unless you're talking about using a trailer.


 
You haven't read the full thread then ;)
 
There's several different designs on this.
 
The modular halfinator. Basically just cut in half but with electronics in one part, and a passive extra one that clips on with butterfly locks. Or two active parts.
 
Then there's the pro/signature version with Eminence Basslite S2010s instead of HP10Ws.
 
Then there's using lithium batteries instead of SLAs. Or using plastic film solar cells instead of glass substrate, and so on.
 
The version I'm taking to Roskilde this year plays louder than the original version because of larger amp and more sensitive drivers. Size is the same but it will weigh only half at 11-12kg compared to to the 25kg of the original. Weigh will depend on whether I'll have 1 or 2 10Ah batteries inside for 12V or 24V operation (each 10Ah 12.8V LFP cell weighs 1 kg).
 
 


Edited by Saturnus - 08 February 2012 at 3:42pm
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Points: 714 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Saturnus Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2012 at 3:39pm
Originally posted by slaz slaz wrote:

Originally posted by Saturnus Saturnus wrote:

Originally posted by satta sound satta sound wrote:

Thanks Saturnus!

I was allready aware of your boominator! Great project!
It has been a great source of information for me.
Only thing is that i rather would have the sound only going one side.
Is there a way to adjust the boominator like that?
Thanks!
 
I'm not quite sure what you mean. Sound does spread in all directions no matter how you mount the speakers. The Boominator just uses that fact for an advantage instead of a drawback. The most annoying thing about a boombox that isn't bipolar is that the sound coming to the back side is very distorted and frequency limited. I truly believe a bipolar speaker is less annoying to be on the "wrong" side of compared to a monopolar speaker.


It might be an advantage in some situations .... definitely not for me. If you want it in the middle of a field at a festival or some such - yes you might want that. I want the sound field to primarily be in front of the speaker box - in the direction the drivers face .... "spillage" in the other direction can be a problem.
 
Well. I beg to differ. And as you said you haven't heard the Boominator. I almost guarentee you that when you hear one, you will completely reverse your opinion on that matter.
 
It sounds strange but you will be convinced that a bipolar will actually sound like it has less "sound spill" as you put it than a regular speaker.


Edited by Saturnus - 08 February 2012 at 3:41pm
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I forgot to mention that there is naturally a way to make the Boominator work more like a monopole.

You could insert a switch that both turn off the "back side" piezos while inserting a filter coil to the woofers. The coil should be as low resistance as you can afford and should have an x-o at somewhere between 300 and 600 Hz. Remember that at the same time you must insert a resistor on the "front side" woofers of exactly the same resistance as the filter coil. This is to ensure that the two drivers don't get different Qts and therefore would work against eachother instead of supplementing eachother.

Basically the "back side" woofer will only work as an added bass speakers when the switch is thrown.

It's not a mod I'd recommend but it's doable. Happy experimenting.
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