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off-grid, efficient set-up
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slaz View Drop Down
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Points: 2713 		Post Options Post Options   Thanks (0) Thanks(0)   Quote slaz Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2018 at 9:01am
Originally posted by valve head777 valve head777 wrote:

NNobody so far has mentioned power supply???? I live off grid, its relatively important....


+1

Its actually the MOST important. It will determine what you can/can't do, as well as how long you can play.

You can talk as much as you like about sound sources, crossovers, eq, processing etc. - but the starting point with all that is "yeah, but how do I get power to it".



Edited by slaz - 06 April 2018 at 9:03am
REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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carlosdelondres View Drop Down
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Points: 243 		Post Options Post Options   Thanks (0) Thanks(0)   Quote carlosdelondres Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2018 at 9:12am
Class D amp boards, battery to provide appropriate voltage, MPPT charger, solar panel(s). With reasonable cabinet efficiency, loads of electricity is not needed for decent SPL in a small space!
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slaz View Drop Down
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Points: 2713 		Post Options Post Options   Thanks (0) Thanks(0)   Quote slaz Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2018 at 9:45am
Originally posted by carlosdelondres carlosdelondres wrote:

Class D amp boards, battery to provide appropriate voltage, MPPT charger, solar panel(s). With reasonable cabinet efficiency, loads of electricity is not needed for decent SPL in a small space!


Yes - true - BUT ..... likely as not you'll wind up with amp modules that need somewhere between 24-50V. If using DIY crossovers, pre-amps etc. - its gonna (fundamentally) want +15V/-15V, other stuff might need +12V  - a laptop is usually gonna want +19V ..... its NOT so easy/straightforward.
REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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imageoven View Drop Down
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Points: 2186 		Post Options Post Options   Thanks (0) Thanks(0)   Quote imageoven Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2018 at 10:17am
And off grid doesn't mean he doesn't have 240v generator...


Also important is if it needs to be transportable, if not big horns can improve efficiency. 
Keep pushing on, things are gonna get better.
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Points: 3122 		Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2018 at 11:14am
you really want to plaster the inside of a straw structure or the air will be constantly filled with dust. when properly tied together and rendered a straw wall is actually very rigid and a very good sound barrier.
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carlosdelondres View Drop Down
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Points: 243 		Post Options Post Options   Thanks (0) Thanks(0)   Quote carlosdelondres Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2018 at 11:33am
Well, perfectly possible to find amp boards to run on 24V, Sure ADAU1701 DSP for crossover/alignment/EQ, DC-DC step down modules for +12, +5 and +19V rails for other electronics, build a 6S 18650 battery pack to run it all. A bit of a faff, but no more than designing and building a bunch of enclosures.
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Hemisphere View Drop Down
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Points: 2272 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2018 at 12:02pm
Let's see if we can get this to 3 pages before the OP provides any relevant specifics about the project LOL
Phase 1: Post on Speakerplans
Phase 2: ?????
Phase 3: Profit!
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valve head777 View Drop Down
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Points: 1781 		Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2018 at 2:39pm
Originally posted by Hemisphere Hemisphere wrote:

Let's see if we can get this to 3 pages before the OP provides any relevant specifics about the project LOL


+1
Freedom of choice, choice of freedom.
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studio45 View Drop Down
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Originally posted by slaz slaz wrote:

Originally posted by carlosdelondres carlosdelondres wrote:

Class D amp boards, battery to provide appropriate voltage, MPPT charger, solar panel(s). With reasonable cabinet efficiency, loads of electricity is not needed for decent SPL in a small space!


Yes - true - BUT ..... likely as not you'll wind up with amp modules that need somewhere between 24-50V. If using DIY crossovers, pre-amps etc. - its gonna (fundamentally) want +15V/-15V, other stuff might need +12V  - a laptop is usually gonna want +19V ..... its NOT so easy/straightforward.



My solution to that was to use one really good, quiet, boost converter to get +48v for the power amp, then a linear regulator to drop that to +24v which I split with a virtual ground circuit into +24/+12/0, to power the crossover (capacitor coupled inputs and outputs of course). Other pieces of low voltage equipment (preamp, Bluetooth, radio transmitters) each get their own linear regulator to drop the battery voltage to whatever is required. I tried doing it all with switchmode converters, but the small cheap convenient ones are just too noisy for audio. As long as you don't need several amps of output at a voltage much lower than your battery, linear regs are fine, and you can get any voltage you need.
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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