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Mobile 12V Sound System (Bike Mounted)

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Jimi Handtrix View Drop Down
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    Posted: 18 August 2019 at 6:33pm
Hey y'all! I've been thinking about constructing a sound system for a while now, and thought I might begin with a bike-mountable mini-rig. I've only just began reading up on the subject, but I think I have a general idea of how I want it to look, sound and function. I have a few general questions to start off with, so I can put together a list of all the main components I'll need. I'm not quite sure what cabinet design(s) I should use - I was thinking about something which will fit 1x 15", 2x 10" or 8", and 4 or more tweeters, plus stow-room for battery, amp, etc. (preferably at the bottom). Does it make sense to have a scoop design (which would add more height and probably some weight as well), or would a more compact bass reflex design suffice for the sub? Not really trying to go under 50-60hz anyway. Also, I would optimally like to have 1 single cabinet that fits everything, but I can see the obvious transport benefits in being able to separate the sub cabinet from mids/tops. What are your thoughts?

Here's a list of things I'll need as far as I can tell.. anything important I'm forgetting?
  • Amp (is 1x Pioneer GM-D8604 enough for everything?)
  • Crossover (do I need an extra crossover with the amp above?)
  • Drivers (any good combinations of 15", 10"/8" & tweeters you can recommend?)
  • Battery (looking at Landport LPCG-12-50 or 12-38; would either of these be fitting?)
  • Voltometer
  • Wiring
  • Cabinet(s)
  • Bike / Carriage
Optimally I would like to have a multi-channel mixer (Allen & Heath / Soundcraft) with sends for external effects, and a Pioneer CDJ to play from, but I realize this may be hoping for a bit much. Is there anyway to run such devices on a 12V supply, or is it completely out of the question? And what alternatives could there be for sound output to the amp? If the only option is playing from an IPhone / Ipad / MP3 player it would kind of take the fun out of it! =D

Looking forward to hearing your thoughts!
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slaz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote slaz Quote  Post ReplyReply Direct Link To This Post Posted: 19 August 2019 at 7:43pm
REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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Jimi Handtrix View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jimi Handtrix Quote  Post ReplyReply Direct Link To This Post Posted: 19 August 2019 at 7:51pm
I had a brief glance at that thread - will be sure to read through everything 12v / bike related in the forum (in due time)! Would either one of the batteries I mentioned above be good for powering a similar setup for 6-10 hours? I'm not sure how to tell if it's a "starter" battery or a "leisure" battery - is there any specific characteristic to tell them apart? And would there be anyway to get an actual dj setup (mixer & CDJ) running on a 12v setup? Thanks!
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slaz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote slaz Quote  Post ReplyReply Direct Link To This Post Posted: 19 August 2019 at 9:56pm
I'd say running for 10 hours (at max/close-to-max volume) is gonna need at least double that battery capacity. Leisure batteries are usually described as AGM or gel battery .... starter batteries are "flooded".

You possibly get a small dj mixer in a rucksack - dunno about the CDJ though.
Power-wise - well there are certainly some compact mixers that rundirectly from 12V DC (not sure about DJ mixers with A-B cross-fader though).
The CDJ .... I think you'd have to use an inverter for that ... which means more space/weight and more battery power.

I set up an old netbook (Asus eeePC) with virtualDJ and programmed some effects into it. Stuff like rewind, bass cut, siren etc. which lend themselves to reggae style ....  much more compact, and with good battery life if you disable wi-fi, bluetooth, ethernet.



REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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studio45 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote studio45 Quote  Post ReplyReply Direct Link To This Post Posted: 20 August 2019 at 2:21pm
Pioneer amp is a good choice. You won't need any other active crossover to run a 2-way system. But you will need a passive crossover inside your mid-tops to seperate the mid frequencies from the treble. 

To estimate battery life, assume that when playing music at full volume, your continuous power output is about 12.5% of the rated maximum output of your amp (this is because music contains loud bits and quiet bits). So for that amp rated at 600 watts into 4r, the equivalent continuous figure is 75 watts. Multiply this by an (assumed) 80% efficiency figure for the amp, and you are at about 94 watts continuous draw from the battery. This is about 7.8 amps. So a 50AH battery could be expected to last about 6.5 hours if you drain it all the way to flat. However, consider whether you really need to play at full volume for the whole party - if you can spend some time playing at 50% or 75% power, you can add another couple of hours onto that. 

I know from experience that trying to put any more than 50Ah of lead acid batteries on a bike trailer makes it a complete PIG to tow around, especially uphill. You will struggle to get the combined weight of your bass bin, amp and midtops below 30kg, so adding 18kg of battery onto that makes for a serious load. And remember to keep the weight down low, otherwise you will fall over going round corners ;)

Faital Pro make some good drivers for mobile applications. Look at their 15" neodymium offerings for your bass bin, and the 4FE35 for a cheap mid-top solution (think *arrays*....) 
As for box designs, I have had great success with tapped horns for bass - but people often go for reflex, and that can be great too.
Studio45 - Box Builder Commotion Soundsystem -Mobile PA
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wakemasia Quote  Post ReplyReply Direct Link To This Post Posted: 27 August 2019 at 8:47pm
I have  a mobile PA and we usually play from an XDJ board which is powered from a laptop running on its own battery.. usually lasts for about 5-6h. Works pretty good and I get about 12h (the rest of the time we play from a phone) from an 80Ah AGM battery with about 1kW RMS. This is, staying over the recommended 11,2V that are recommended to preserve the battery's life. Recently I got a second battery and a sinus inverter with 300W to run a bigger lights and DJing setup but this is probably overkill.

Good luck and post pictures!
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Daniel S View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Daniel S Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2019 at 5:52am
Originally posted by Jimi Handtrix Jimi Handtrix wrote:

And would there be anyway to get an actual dj setup (mixer & CDJ) running on a 12v setup? Thanks!


Try the Pioneer XDJ 700, they run on 12v from a wall wart. There's plenty of mixers as well that run on 12v. Or you could always go with some DJ controller that is USB powered.
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