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Boominator MINI (development thread)
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Palomino View Drop Down
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Points: 80 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Palomino Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2015 at 8:27pm
OK, pm sent.  Let me know if you get it.
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Points: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mr. d Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2015 at 9:29pm
well palomino, i feel like an idiot.
i have no idea where to find a pm from you and i have no idea how to pm you.  i think though that i'm unable to pm until i have 10 posts - bummer.  so here's what i'll do; click on my members profile and shoot me an email - i'm going to activate it until such time as i'm able to send and receive pm's.  thanks for your efforts.
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Points: 83 		Post Options Post Options   Thanks (0) Thanks(0)   Quote roopes Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2016 at 11:20am
For loudness would you build a Boominator mini NS525 or a Halfinator with hp10 and mpt001, they are approximatly the same price to build. Which would you go for?
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Points: 517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lutkeveld Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2016 at 1:11pm
Halfinator, no doubt. I'm also pretty sure the Halfinator is cheaper. Halfinator also has more power handling capability, on 24V it breaks the MINI.
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Hi there,
I have four old (but unused) Vifa P13WG-00 8ohm woofers and a pair of Vifa D25AG-35-06 tweeters. Neither are manufactured any more. I'd like to build a portable bipole "boom box" with them. I may have to buy some more or different tweeters. The woofer specs are:

* Power handling: 40 watts RMS/55 watts max * Voice coil diameter: 1" * Voice coil inductance: .70 mH * Nominal impedance: 8 ohms * DC resistance: 5.5 ohms * Frequency response: 60-5,000 Hz * Magnet weight: 8.5 oz. * Fs: 60 Hz * SPL: 86 dB 1W/1m * Vas: .35 cu. ft. * Qms: 1.70 * Qes: .68 * Qts: .48 * Xmax: 3.0mm * Net weight: 1-1/2 lbs. * Dimensions: Overall Diameter: 5-1/2", Cutout Diameter: 4-1/2", Mounting Depth: 2-3/8", Magnet Diameter: 2-7/8", Magnet Height: 1".

I've built one set of bookshelf speakers about 20 years ago and would like to get back into it with my teenage son. I have some basic knowledge and an old loudspeaker design cookbook, but not enough knowledge to know if these drivers are suitable for this kind of project. I'm seeking advice, help (maybe someone who has time to discuss via PM?) to get me started.  Thanks!


Edited by Roo2 - 04 February 2016 at 9:32pm
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Re-hi all. Not new to this thread, just actually getting my Mini-Boominator project restarted.

Does anyone know if I can get measurements using Sketchup Viewer? I have overall dimensions and stuff, but can't take measurements in Sketchup. Any help would be appreciated.
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Originally posted by Larzman Larzman wrote:

Re-hi all. Not new to this thread, just actually getting my Mini-Boominator project restarted.

Does anyone know if I can get measurements using Sketchup Viewer? I have overall dimensions and stuff, but can't take measurements in Sketchup. Any help would be appreciated.




Haha, damn, been 3 years back to page 5 from my original comments... time flies :)

Here's a quick diagram with dimensions for the front & back panels that is easier to use than Sketchup.


Thanks to Saturnus for the design, and to GMarsh (if memory serves me) for the dimensions).
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Points: 22 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Roo2 Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2016 at 11:42pm
Hi, I'm trying to get my head around the calculation of the sealed box volume for a sealed box bipole design using the Vifa drivers described above. I've been doing some reverse engineering using the Unibox spreadsheet and the TS parameters for the various drivers used for the Boominator and Boominator mini designs. I'm really missing some fundamental understanding. It appears as though the box volume (one side only) is about half that calculated for a single driver when there are 2 drivers back to back? 
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Originally posted by Saturnus Saturnus wrote:

Originally posted by Saturnus Saturnus wrote:

Vance Dickason loudspeaker design cookbook is the ultimate guide to everything involving loudspeaker design.

Btw, you won't find the exact box tuning that I use for all my builds that are intended for outdoors use, in this or any other book as it's my own development.

"Perfect" boombox tuning according to Saturnus:

Take the calculated Vb and Fp for a BR cabinet using standard optimum BW tuning for Q=0.707 (square root of 2 divided by 2). From these you calculate calculate a new Vb and Fp.

Vb(new) = Vb / Pi

This is the same regardless if it's a closed or BR cabinet.

Fp(new) = Fp * 1.414 (square root of 2)

Plot these into a simulator. F-6 should be close to 80hz and F0 close to 100hz. If not then the driver is unsuited.


This appears to be part of the story. I have the loudspeaker design cookbook which is a good start. Can someone tell me if the above tuning criteria applies to the original Boominator or the Mini or both? Thanks.
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This was written in the context of the original Boominator.    I believe some compromises were made to the boominator mini (NS6) to better balance indoor / outdoor performance. From memory, I think he discussed the use of a lower Q near the beginning of this thread.
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Points: 22 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Roo2 Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2016 at 5:13am
I've done some sealed box calculations using "the cookbook" formulae and can see really good alignment with the Aura NS6 driver and Saturnus' preferred Qtc = 1.207. Vb = 4.3 litres per driver (8.6 litres for two drivers) and the actual original box (200x200x700 outside) volume is about 8.5 litres per side.

I can't see the same driver to box volume alignment (using Qtc = 1.207) for the Aura NS525 or the Monacor 60/8.

What am I missing?

Vas (litre) fs (Hz) Qms Qes Qts α Vb (litre) EBP fc (Hz)
Aura NS6 16.48 55 10.8 0.58 0.5504 94.8
Qtc 0.707 0.650 25.36 70.6
Qtc 1 2.301 7.16 99.9
Qtc 1.207 3.808 4.33 120.6
Vas (litre) fs (Hz) Qms Qes Qts α Vb (litre) fc (Hz)
Aura NS525 8 70 11 0.58 0.5509 120.7
Qtc 0.707 0.647 12.37 89.8
Qtc 1 2.294 3.49 127.1
Qtc 1.207 3.799 2.11 153.4
Vas (litre) fs (Hz) Qms Qes Qts α Vb (litre) EBP fc (Hz)
Monacor 60/8 6 65 2.1 0.64 0.4905 101.6
Qtc 0.707 1.078 5.57 93.7
Qtc 1 3.156 1.90 132.5
Qtc 1.207 5.055 1.19 159.9
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Points: 517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lutkeveld Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2016 at 9:19am
The MINI V2 is using a Q=1 alignment for the closed box series capacitor trick
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