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Class D Switching Power Amplifiers and Power D/A conversion

The Boominator - another stab at the ultimate party machine
The Boominator - another stab at the ultimate party machine
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Old 1st September 2018, 12:10 PM   #6691
lutkeveld is offline lutkeveld
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Join Date: May 2013
LM3886 is a great amp, but the TPA3118/TPA3116 is a better alternative for portable builds due to its lower power consumption. Lots of modules readily available on ebay.
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Old 3rd September 2018, 12:38 AM   #6692
Steffenland is offline Steffenland
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Join Date: Aug 2018
Quote:
Originally Posted by lutkeveld View Post
LM3886 is a great amp, but the TPA3118/TPA3116 is a better alternative for portable builds due to its lower power consumption. Lots of modules readily available on ebay.

I dont rly care about power consumption as this thing will be plugged in most of the time, if I can manage to get 3 hours out of it I will be happy. I will spend a bit time on the carpentry here and I want to fill it with some nice hardware, but I will need someone to help me out with a shopping list so I know where to start.
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Old 3rd September 2018, 04:59 AM   #6693
Nenola is offline Nenola  Finland
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Join Date: Feb 2008
Ok, then the LM3886. But I suggest that you create your own topic for this... because it doesn't have much to do with Boominator, or class D
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Old 10th September 2018, 10:16 PM   #6694
REIER is offline REIER
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Join Date: May 2016
Location: Norway
So I have been wondering about something for some time now. The boominators dipole design boost low end performance, and gives some extra sensitivity due to magnet to magnet construction. But what if I only need the boominator to play from 200/250 hz and upwards? Can I get away with only one side and half the volume? What am I missing here?



The reason for this question is that I am trying to build a really compact PA system. And I am REALLY satisfied with the boominators performance. The more I listen to them, the more I love them. This summer I built 2 tham15s, and together with to halfinator boxes, we hosted a forest party for 110 people, and everyone was just baffled by the sound coming from those small boxes. But it was was to much work to carry this sound system 2 kilometers in to the forest. So now I am planning on making a smaller build, with some smaller subwoofers (for smaller parties yes), and back to my question. Can I chop off the other side of the boominator next time I build one if I adjust the xover accordingly?



Here's a picture of the project.


40355742_2026348307611977_365736999493042176_n.jpg
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Old 12th September 2018, 06:05 AM   #6695
horst303 is offline horst303  Australia
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Join Date: Nov 2009
Location: Sydney
Quote:
Originally Posted by REIER View Post
So I have been wondering about something for some time now. The boominators dipole design boost low end performance, and gives some extra sensitivity due to magnet to magnet construction. But what if I only need the boominator to play from 200/250 hz and upwards? Can I get away with only one side and half the volume? What am I missing here?



The reason for this question is that I am trying to build a really compact PA system. And I am REALLY satisfied with the boominators performance. The more I listen to them, the more I love them. This summer I built 2 tham15s, and together with to halfinator boxes, we hosted a forest party for 110 people, and everyone was just baffled by the sound coming from those small boxes. But it was was to much work to carry this sound system 2 kilometers in to the forest. So now I am planning on making a smaller build, with some smaller subwoofers (for smaller parties yes), and back to my question. Can I chop off the other side of the boominator next time I build one if I adjust the xover accordingly?



Here's a picture of the project.


Attachment 702745
a little confused, you find the boominator too big, but then in your picture you suggest these massive subwoofers?

But ignoring that issue, yes you can build anything you like, the thing about the dipole configuration is that it is the most compact way to mount two woofers and benefit from doubling the surface area and halving the impedance, and that's it, and that's not bad because that's 3dB each.

As far as the benefit of having the magnets interact with each other and bump up the sensitivity, I'm not really convinced.
Motor design is a pretty involved process and optimized for the voice coil and magnet gap, shoving another magnet at the back is pretty un-mathematical, who is to say that you're not making things worse? well those who have measure this, and as far as I know, nobody has. Gut instinct (well inverse square law basically) tells me that it probably doesn't matter either way.
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