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Solar Boom Trailer!
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leggler View Drop Down
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Joined: 05 June 2012
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    Posted: 05 June 2012 at 9:33pm
Hi Guys!

I was just surfing this forum - there are damn-nice projects around! I am planning to build a nice 12v solar powered sound system mounted on a bike trailer!

Unfortunately I have no clue about building soundsystems so far (well, did a lot of internet-research, but thats it) and are low on money (and from my research I can tell that one can spent 1000ds on sound equipment!!). So I am desperate to know how to get the most boom for my buck! ;)

The electricity-side is already settled - I have a 12v solar home system, 55w Panel, cheap charge controller and a 1100Ah Battery (yp, that should be more than sufficient for long summer nights ;)

Regarding the sound compontents I would be realy thankful for some advise. Thats is what I was thinking to buy so far:

Amp:

http://www.ebay.de/itm/Bull-Audio-BA-AMP-2-100-2-Kanal-Endstufe-NEU-GARANTIE-/270804628272?pt=CE_Auto_Hi_Fi_Autoverst%C3%A4rker&hash=item3f0d36b330#ht_3112wt_1141 - Bull Audio BA-AMP 2.100 2 channel

2x55W RMS at 4 ohm
Quality seems to be alright, the and on ebay you can find it for EUR 35

Drivers:
I was thinking of buying mainly car equipment, since that stuff is rather cheap. Is there any problems with that? I guess they arent different from any other speaker?

High- and middle tone (2x2 speakers)

http://www.just-.de/lautsprecher/sinustec-st-165-16cm-2-wege-komposystem/a-1351/ - Sinustec ST 165 - 16cm

2x150W RMS (4 ohm)
Bass:
No Idea yet - any suggestions? If I get a bass, I would also need a second amp I guess. Or would it work if I wire one channel with the bass, and the other with the high and middle toner?? Would you get only 1 

If I have only one amplifyer, with 2x55W RMS - is that enough to make some boom? In a distance of app. 10m the music should be definetly loud enough to dance. I guess therefore bass is more important than the high- and middle toners?

And finally: The boxing:
How do I put these into a box? Should I get 1, 2 or 3 boxes? Originally I was thinking making 3 (1 bass, and left and right high- and middletoners), but I saw some pics here, maybe its good enough to put it all in one?!
And how to build a box, so that you get good sound results? I saw, that most ppl just use regular wood plates as material?

Wow, a lot of questions. Would be really cool if you have answers for some of them!

cheers! leggler
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Saturnus View Drop Down
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All the things you plan to buy are useless crap. Don't throw your money away on such junk.

Generally speaking. Nothing built for car audio can be used.

Granted, some few amps of specific makes are good. And if your only interest is going cheap in a small build-and-throw-away system then you can suffer car audio speakers.

What gets you most bang for your buck is pro speaker drivers and class D amp.

You're not saying how much you're willing to spend, how loud you intend to play, or how long you would like you battery to hold? (although with 1100Ah that could easily be several months, eg. a Boominator would play max volume for 4½ month on that battery capacity, and with solar cells it would NEVER run dry).
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login4 View Drop Down
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Points: 1441 		Post Options Post Options   Thanks (0) Thanks(0)   Quote login4 Quote  Post ReplyReply Direct Link To This Post Posted: 06 June 2012 at 8:53am
ye its all about efficiency, so look at the sensitivity of the drivers you might want to use, and you want as close to 100db as poss, you will need to make the most out of every watt you can.

for mid highs i would just buy some second hand pro audio cabs with low wattage and high sensitivity, something like a 12" and a 1" comprsion driver.   

and for bass build 1 or two THAM15 and load with yet again something sensitive.

also make sure you have your high pass filters in place as you dont want to be trying to amplify signals you cant even hear or the speakers cant produce, its like throwing amps(A) away.

good luck with your build.
 


Edited by login4 - 06 June 2012 at 8:54am
CELTIC SUBSONIC. Tannoy VQ, Fane PRIME bass , powersoft driven. just yum.
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leggler View Drop Down
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Thanks for the answers guys!

As for how loud that thing should go: It should be able to provide danceable sound volume in a distance of up to 10m. In that distance you can still lead conversations, but only if you talk quite loud Evil Smile

I know that my battery is oversized. But that way I keep the option open for a small light-system! And one has to consider that it is a 12v lead-acid deep cycle battery -  it should not be discharged more than 50%. If you still do so it will reduce lifetime. So the useable capacity is mor like 650Ah. 

The solar stuff already cost me quite a bit, so I didnt want to spend more than EUR 150 for the sound equipment.

Why can car-stuff generally not be used? 

Whats a good 12V class D amp / driver combo for that money, any reccomondations? 

cheers!
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Saturnus View Drop Down
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I wish you had stumbled across this site before investing in that battery and solar panel.

Not that it's the only solution out there but my boominator design (google it) would fulfill your requirements about volume but only needs 2x 7.2Ah motorcycle batteries in parallel inside, and a 10-12W solar panel to basically run forever at full volume, around the clock.

Naturally it's a fair bit more than €150. You can build one for about €350 excluding solar panel.
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amlu View Drop Down
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have a look at my system... may give you some ideas.
http://forum.speakerplans.com/my-new-12v-bike-trailer-setup_topic66973.html
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leggler View Drop Down
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Saturnus, thanks for your condolences ;)  But I got the solar equipment I for free, it was just lying around in my dads garage, so there is no big loss there ;)
And if I have a little more power, I can use it for a small light system - guess that would be a good upgrade! Since the thing should be bike-mounted, I also have not so much of a place- and weight issue...

But the Boominator-design is a great hint! Did you first build it? Great work! After reading the design-specs (or, lets say, after 3hr of reading the diyaudio thread... ;) 2 questions spring to my mind:

- Arent the drivers extremely over-dimensioned, regarding the 2x25W Amp? The P.audio HP10 can take 100W RMS each, and there is 4 of them (besides the tweeters). Couldnt I just use 2 HP10s, and still get the same SPL and quality (since I still would use less than 1/4th of the rated power...). Or use a second amp, and get twice the SPL...

- How exactly does the magnet-to-magnet mounting increase the efficiency? couldnt find any info on that, does it impact sound quality as well?

- Regarding the wiring, did you use that scheme:
http://i1080.photobucket.com/albums/j338/MarcusNordlander/Untitled-1.jpg 
What are the resistors for, just to balance high- vs. low frequencies? And is there no passive filter between tweeters and HP10s? could save some power, i guess...

cheers!



Edited by leggler - 06 June 2012 at 6:50pm
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leggler View Drop Down
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... continiued reading the other thread, consider my "why is magnet2magnet more efficient" question resolved ;)
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leggler View Drop Down
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Amlu, thanks for the link! found that thread already, extremely cool system! but 1 or 2 dimensions above my needs it seems ;) 
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amlu View Drop Down
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beyma 605nd are cool little drivers. 101db sensivity is nice :-) add some drivers for the bass (neodymium magnet preferred to save weight), and a pair of tweeters, but you may do without, they play high enough. use winisd to calculate tuning for your bass boxes. get a minidsp to act as crossover or get a car audio unit to do it. plus a couple of class d amps (tripath, sure electronics, 41hz etc)
on a 110ah battery it will run for hours with no trouble.


Edited by amlu - 06 June 2012 at 11:34pm
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And on 1100ah for weeks probably!
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alphabetikal View Drop Down
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im not being funny but do u mean 110ah or 1100mah?
i dont think 1100ah at 12v exists??
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