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Class D Switching Power Amplifiers and Power D/A conversion

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Old 3rd December 2008, 11:49 PM   #161
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Old 4th December 2008, 12:16 AM   #162
col is offline col  Australia
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my mobile system is a bit more modular than the most excellent boominator. There is some pics of it here:

http://pix.minirig.org.au/main.php?g2_itemId=550

and here:

http://pix.minirig.org.au/main.php?g2_itemId=663

It breaks down into 3 entirely different systems depending on the amount you want to carry. Last weekend I was at a music festival and I just used the amp9-basic, one sub and one pair of 6x9", plus all the DJ inputs. It ran off a inverter and a solenoid/isolator dual battery setup in a car.

In someways though it is better to have it all compact in one unit. One of the hassles with the modular system is it isn't very convenient to just chuck in the car when everyone deserts the campsite. Our problem is mainly all the DJ paraphernalia though.



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Old 4th December 2008, 01:00 AM   #163
tsnell is offline tsnell  Australia
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Cheers Cal, thatíd be right, I mentioned being under moderation and that was the first post that went up straight away!

Nice looking setup col! Looks very cool but I do want something battery/solar powered and the portable part is nice (I donít have all the dj gear to lug around). The car stereo is usually suffice but the little corolla battery goes flat fairly quickly. At most festivals it isnít a problem because you can just push start it to give it a charge but itíd be near impossible to push start at falls (not sure if youíve been), youíd end up running over somebodyís tent!

Are they standard car 6x9s? I think Iíll be back to Saturnusí suggestion of car tweeters if i donít find some other suitable high frequency drivers soon.

Iíve had a good read through the Amp9basic docs and think Iím sold on it. Itís got much more oomph than the amp6 and added flexibility with the bridging capabilities. Iíll sleep on it but more than likely think thatís the path Iíll take.

Now the questions are Tweeters and active/passive network...
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Old 4th December 2008, 01:49 AM   #164
col is offline col  Australia
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tsnell, sounds like you would be better off just putting a dual battery setup in your car and powering your car audio off the auxiliary battery. Iv'e just done this with my car, it was awesome at Earthcore and if the battery started to get a bit flat I could just leave the engine running for a bit, not that I needed to though.

Components:

1 x redarc dual battery isolator (http://redarc.com.au/smart-start.htm)

cable and fuses to the location of the second battery

1 x Hybrid deep cycle fast charge battery (mine is a supercharge allrounder MRV70)

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Old 4th December 2008, 02:09 AM   #165
tsnell is offline tsnell  Australia
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Thanks col. Still keen to head down the boominator path though. It isn't just for festivals, it will be good for the boat/beach/park too, it's just that falls fest is a way of setting myself a deadline (it's the only way I ever seem to get this sort of thing finished).
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Old 4th December 2008, 02:43 AM   #166
col is offline col  Australia
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yeah, for sure still build your boominator.

My next mobile system is going to be something I can transport with a bicycle. I have a spare amp9-basic a 12v 7aH SLA and a DC/DC inverter (http://www.altronics.com.au/index.as...=item&id=M8627)

I'm thinking of using one of the pairs of 6x9" but still running the amp9-basic in 24v.

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Old 4th December 2008, 04:10 AM   #167
col is offline col  Australia
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Default tweeters

I personally don't like piezo much but if you are looking for something cheap there are these on Ebay:

http://cgi.ebay.com.au/TWEETER-PAIR-...rkparms=66%3A2|65%3A1|39%3A1|240%3A1318


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Old 4th December 2008, 06:24 AM   #168
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I can't find the link but Volts online in Australia has 94dB piezo tweeters for $9.95.
They seem to sell Jaycar stuff so maybe you could get them there.
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Old 4th December 2008, 09:25 AM   #169
tsnell is offline tsnell  Australia
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Thanks for the link col. They look interesting, Iíll email the seller and see if I can get any more info. Hi Coit, checked out volts online and compared with Jaycar. They do seem to stock exactly the same lines of gear. Iíve just done a better search of the jaycar site and they actually have a few options there( I had only found one on there before and they looked more made for an alarm siren than for music). Probably the most interesting is this one:

http://www.jaycar.com.au/productView...Max=&SUBCATID=

But there is also
http://www.jaycar.com.au/productView...Max=&SUBCATID=

http://www.jaycar.com.au/productView...Max=&SUBCATID=

and

http://www.jaycar.com.au/productView...Max=&SUBCATID=

They may not be the most ďhifiĒ option out there but the price is right and there is a jaycar nearby. Any thoughts?
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Old 4th December 2008, 10:01 AM   #170
col is offline col  Australia
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If you can't get a pair under $20 I wouldn't bother.

Actually, I know someone in Canberra who might be able to sell you some dirt cheap.

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