Portable active boom box (LiFe, solar, mini DSP) - diyAudio
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Old 16th September 2013, 10:00 PM   #1
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Default Portable active boom box (LiFe, solar, mini DSP)

I have a bunch of spare stuff sitting around. I don't know what to do with it.
I already have my larger beach radio, how about a self contained (solar panel separate, will plug in) active pool side radio?

I currently have sitting here:

Mini DSP --would run iPod directly into this. (Use iPod to adjust volume, wouldn't bother with the line out then adding a pot for volume on the mini DSP.....although I could try both and see if the SQ is that much different.)

MB Quart made in Germany PTE 25 tweeter...think it's a titanium dome 1" not sure
Click the image to open in full size.

Alpine 4ch class D amp. (Alpine Electronics of America, Inc.)

I started dismantling the amp, cuz it's been sitting there. * Might as well make it as light as possible. *
Click the image to open in full size.

(1) peerless SLS 8" subwoofer
http://www.parts-express.com/pe/show...umber=264-1102

Alpine Type R 6.5" midrange
Click the image to open in full size.




I know I'd need a LiFe battery of some sort, I was thinking for low(Ish) listening levels, with a 13 watt solar panel, I'd be able to get away with a 5-10 a.h. Battery.
Something like this....$75 or less would be nice
http://www.batteryspace.com/Custom-L...pen-Wires.aspx
$55 6aH battery here...
http://www.batteryspace.com/custom-l...w-pcb-7-2.aspx

This radio will most likely be used poolside only in FL for me and my parents etc when we go to the house down there. So I'd like to keep cost on the low side.

Some fiberglass would be fun to use, post up some ideas!


Just for reference here is my big beach radio. So no need for anything this large lol
Click the image to open in full size.

Last edited by m R g S r; 17th September 2013 at 07:05 PM.
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Old 17th September 2013, 06:57 PM   #2
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I'm returning $60 worth of stuff to P.E....including the celestion 5" speakers, because I found this alpine type R 6.5" that I have, along with the dome tweeter from mb quart

Last edited by m R g S r; 17th September 2013 at 07:03 PM.
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Old 19th September 2013, 02:24 PM   #3
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Nevermind

Last edited by m R g S r; 19th September 2013 at 02:30 PM.
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Old 23rd September 2013, 11:52 PM   #4
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External dimensions...
Click the image to open in full size.
Front and rear panels are 3/4" top bottom sides are 1/2".

Got started clamping. No screws to keep the outside clean looking. (And no need for pocket holes on this cabinet)
Click the image to open in full size.

The amp will fit as is, but it will be very tight. Esp with the separate sealed enclosure for the 6.5" mid. So I will be modifying (or milling an entire new heat sink) for the amp
I plan to have the end of the port opening right on the Heat sink to help with air exchange inside the hot small enclosure. This amp heats up quickly. (Despite it being class D)
Click the image to open in full size.

Alpine components probably not worth anywhere near what alpine charges for them :/
Click the image to open in full size.

Total internal volume before battery displacement, amp displacement, driver displacement and port displacement is 1260in^2. Or 0.73 cubic feet.

Divider centerline for midrange enclosure will be placed 6" from the inside, so the midrange enclosure will be 345in^2 or .2 cubic feet.
And the subwoofer enclosure will be 885in^2 or .512 cubic feet.

Last edited by m R g S r; 24th September 2013 at 12:16 AM.
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Old 24th September 2013, 12:17 AM   #5
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This battery
Custom LFP 18650 Flat Battery Pack: 12.8V 6000 mAh ( 77Wh, 2A rate ) w/PCB (7.2)
Is 5.91"x5.5"x.91". So it will fit inside the midrange enclosure. Not sure if I'm going to mount it in there yet, however.
It would take up 29.57in^2 from the mid enclosure.
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Old 24th September 2013, 12:45 AM   #6
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With a 2" port 7" long (0.056 cubic feet displacement), the amp roughly 10"x10"x1" (0.058 cubic feet) and driver displacement, it will be right around .60 cubes of volume left.


That should yield roughly 40hz tuning for the subwoofer. Perfect for rich sounding bass at low listening levels.

Flared port:
http://www.parts-express.com/pe/show...number=268-348

Last edited by m R g S r; 24th September 2013 at 12:51 AM.
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Old 24th September 2013, 01:17 AM   #7
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Nice bump in the 60-80hz range, and still acceptable bass....
Click the image to open in full size.
17L enclosure, 2" vent 7" long

and with 20 watts it will do 103db or so....perfect, exactly my goal for this project!
Click the image to open in full size.

Last edited by m R g S r; 24th September 2013 at 01:22 AM.
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Old 24th September 2013, 02:05 AM   #8
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My solar panel is slightly large for this application, so I'm trying out a different panel....for $25 we'll see what happens.
It's most likely a 5w panel. It says .7A at 12v but I doubt it's that high. Probably 5w.

Last edited by m R g S r; 24th September 2013 at 02:13 AM.
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Old 24th September 2013, 11:56 AM   #9
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Glued another panel on. Gotta start cutting holes, planning all mounting etc of components etc

Click the image to open in full size.
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Old 24th September 2013, 01:46 PM   #10
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It appears I need to use this battery. The other battery had a 2A discharge rate pcb. That won't be enough.
The 7A discharge rate should be fine for when the amp pulls peaks during high bass content music.
Custom LiFePO4 26650 Battery: 12.8V 6.6Ah (84Wh 2A Rate) w/ PCB & 6.0" 22AWG Open Wires
$68 for this battery. But it won't fit in the midrange enclosure, no biggie.
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