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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 28th May 2011, 08:34 AM   #1681
Saturnus is offline Saturnus  Denmark
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Location: Copenhagen, Denmark
Quote:
Originally Posted by Arbitrage View Post
Saturnus:
We prefer to buy them through an DK or EU dealers, since none of us have ever used such services before, and we wan't to be 100% sure, that we have the speakerunits on time, and preferably atleast 1 week in advance.
This is also caused by the fact that the money spent on this project will be paid by the entire camp, which is why we wan't to be sure, that we have a working stereo when Roskilde starts.
That's why I suggest shopusa.com. They handle customs for you.

The reason packages are sometimes delayed a long time in customs, is that when you just order something from the States or far east, and you don't prepay costums, you are essentially trying to cheat the local customs. They have no obligation to handle your package in any time frame, so you'll be stuck at the very end of the queue.

When you buy through shopusa.com, you prepay customs and then your package is usually not checked by local custom services. And if they are, they have to handle your package in a given timeframe, usually under 2 working days for smaller packages which is why those trying to cheat/not prepaying have to wait so long sometimes.

Depending on the reseller in the States, you will usually have your ordered goods within a week from ordering at the slowest.

Read here for further info (in Danish from Jyllands Posten): http://fpn.dk/penge/article2053053.ece

Last edited by Saturnus; 28th May 2011 at 08:43 AM.
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Old 29th May 2011, 12:06 PM   #1682
whelibob is offline whelibob  Finland
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Heres the simulation of my new ghettoblaster project:

P. Audio WN-8R, Going to put 70Hz highpass filter.:
Click the image to open in full size.

As a tweeter im going to use Monacor DT-25N:
Neodymium-HiFi-Hochtöner, 80WMAX, 8Ω (DT-25N) bei Trenkenchu & Stadler GbR
Click the image to open in full size.

And the crossover is going to be at 2500Hz:
Click the image to open in full size.


Img going to use Hifimediy T1 sta510A 2*100W@8ohm amplifier

As a battery i have a selfmade Li-ion 7 cells in series and 5 cells in parallel, but im going to increase it to 8series 6parallel. So i will increase the voltage for the new amplifier and abit more playtime. It weighs 1.8kg at the moment and with new cells at 2.3kg.


Click the image to open in full size.

All improvement ideas on the tuning, crossover and other stuff are warmly welcome.

My aim is to get the weight of the blaster under 10kg.
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Old 29th May 2011, 06:31 PM   #1683
Arbitrage is offline Arbitrage
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Join Date: May 2011
I convinced the other camp members to order through shopUSA, and we made an order for 4 GW-1058 today.

Not i just need confirmation that we are right about the tweeters.

From reading the thread I found these Piezo MPT-001:
| IMG Stage Line 110470 |Piezohorn MPT-001 Hjttaler-enheder Piezo Diskanter

As far as I can see, they have same sensitivity, which should make them play equally load.
And the frequency's should be okay, so would 4 of those be suitable with 4 of the GW-1058?

Alternatively we found these:
Produkt info
Should also fit, but double the price, and lastly these:
https://www.elextra.dk/main.aspx?pag...e&artno=H19399
which are lacking specifications.

But after finding the right Piezo's, we should be ready to build, when we get all our parts.
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Old 29th May 2011, 06:43 PM   #1684
Vilhelm is offline Vilhelm
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Join Date: May 2011
Just to get things straight, are the bipolar-speakers in phase, or out of phase? I'm guessing in phase, but just to be sure.

In:
Click the image to open in full size.

Out:
Click the image to open in full size.
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Old 29th May 2011, 08:59 PM   #1685
Phaedras is offline Phaedras  Denmark
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Quote:
Originally Posted by Vilhelm View Post
Just to get things straight, are the bipolar-speakers in phase, or out of phase? I'm guessing in phase, but just to be sure.
(...)
First one is correct.
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Old 29th May 2011, 09:00 PM   #1686
euforia is offline euforia  Sweden
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Location: Vächöttaslätta
In-phase, first picture. Otherwise the cone movement would cancel eachother out.
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Old 29th May 2011, 09:05 PM   #1687
Vilhelm is offline Vilhelm
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Quote:
Originally Posted by euforia View Post
In-phase, first picture. Otherwise the cone movement would cancel eachother out.
That was what I was thinking. Thank you guys!
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Old 30th May 2011, 06:04 PM   #1688
joak0068 is offline joak0068  Denmark
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Wow.

Now the SPA-10PA's are sold out!??

It's incredibly hard to get speakers these days !
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Old 31st May 2011, 02:23 PM   #1689
Smoothy is offline Smoothy  Sweden
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I really hate to aske this and i know that the question have been up before but is it a big no go for the HP-12W? I have a really hard time to get my hand on enything else. It sould work fine in a smalish box, little bigger than the boominator but not much.

any input on this? It would probably not sound crap, just not as good as the original design.
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Old 31st May 2011, 07:59 PM   #1690
Wubbaz is offline Wubbaz  Denmark
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Quote:
Originally Posted by Smoothy View Post
I really hate to aske this and i know that the question have been up before but is it a big no go for the HP-12W? I have a really hard time to get my hand on enything else. It sould work fine in a smalish box, little bigger than the boominator but not much.

any input on this? It would probably not sound crap, just not as good as the original design.
I am no expert, but as previously mentioned, any change in the design of the Boominator can only worsen performance. Picking a 12" driver will require a complete recalculation of the whole cabinet. The Boominator is designed to use 10" drivers, so I would not recommend using the HP-12W. Instead, I recommend looking at the Goldwood GW-1058, which is the only real alternative. It should be in stock in the US, and you can use ShopUsa.com to buy the speakers. If ordering from the US is out of the question, there is the SPA-10PA, but this should be vieved as the last way out. Using the SPA-10PA will require finding new tweeters and will mean worse performance.
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