Outdoor project

[Chdk88]

Hi all

First of all - i am new here, so i don't really know if this is the right place to post this
Well, here goes..

My plan is to build a stereo for outdoor use, mostly festivals, and it need to be able to play for 100+ people. As it's for festival use i want it to use as low power as possible, if a stereo with this size is able to do so.

The idea was to build a setup with two X1's in the bottom with a Void V18-1000 or a PAudio SD18 driver, and two DR250's on top - don't know witch drivers to use here yet - any suggestions?

My question is - do you think this will work together? And without using any more speakers?

I would like to use a class d/t amp to the setup - is that possible? if so, could you recommend any?

Furthermore the whole thing is supposed to go on 12v batteries, as it is a festival stereo - again, is it possible?

I know it was a lot at one time, but i hope you will help me out here, i really need it.

Best regards
Christian

[teamacc]

Your tweeters have an 4 ohm impedance, and your woofers have 8 ohms.
The tweeters seem louder to me (at 1w/1m), so if you parallel 2 woofers, you would not need any L-pads, and the resistance will be equal all over the spectrum.

This way you can achieve a stable 4 ohm load, which is preferrable with outdoor use, due to low voltage of batteries.

You might take a look at the new T3 amplifier coming up in the "New tk2050 board" tread, which is asymmetrical voltage on 48v (only 48v and ground/0v required), and has a power output of 300w into 4 ohms.

Edit: just read about the 12v battery.
You might consider using a converter, which can easily be combined with one of their amplifiers.

[Pano]

Hi Christian
Of course it all depends on how loud you want it to get. Covering 100 people at a good level with 12 volts is possible with very efficient speakers. But from a practical standpoint, it just does not seem realistic. Power will be very limited. You have picked nicely efficient speakers, but with only about 8 watts and outdoors, you are going to run out of power fast.

It will work, but will not be "slamming". What are your goals with the sound system?

[Chdk88]

We have a tent at 8x4 metres where the stereo is supposed to be, and 50-100 can be. Besides that we just want it to play real loud! - and with a good quality as well. We have severel batteries, and we do charge them along.

last year we had a stereo with car speakers, amp and so - it worked fine but we want to upgrade it a lot now

[Chdk88]

And what do you mean with only 8 watts?

[Pano]

Ohm's law, my friend. The most you'll get out of a 12V system into 8 ohms is about 8 watts RMS. Double that into 4 ohms. Peak will be higher, like 15 watts.

For higher power, you need more voltage. Big car systems use a DC/DC step-up power supply to make higher voltages. It's inside the amp. Maybe you should look into a nice car amp?
Otherwise use 2 or 3 batteries in series for the higher voltage and an amp that can run at those higher voltages (as stated above).

[teamacc]

Originally Posted by teamacc

You might consider using a converter, which can easily be combined with one of their amplifiers.

Converter is DC/DC step up converter.
Clickable
Might really be a good option, now you need to worry about speakers :P

[Pano]

teamacc - sorry I missed your link. Yes, that's the sort of thing. Then find a Class-D amp that can run on +/-50V. Or buy a car amp.

[teamacc]

I would advise some class-T, just because they are mainly more efficient than normal class-D.
Found you a nice TA3020 amp here (clickable :P)

[Chdk88]

So what i could do is buying a converter (like the one linked to), buying a t-amp (like you linked to) and still using the 12v batteries and the speakers i picked?

Or, could i use a car amp instead and then do without a converter? And then just use more batteries?