outdoor 3 way speaker sound system 12v

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http://www.instructables.com/id/Outdoor-3-Way-Speaker-Sound-System-12V/

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Outdoor 3-Way Speaker Sound System 12Vby themakeclass on June 17, 2008

Table of Contents

License: Attribution Non-commercial No Derivative Works (by-nc-nd) ......................................................................

Intro: Outdoor 3-Way Speaker Sound System 12V ....................................................................................

step 1: size of the box .........................................................................................................

step 2: putting the pieces together ................................................................................................

step 3: Using braces ..........................................................................................................

step 4: Using battans ..........................................................................................................

step 5: Making the speaker holes .................................................................................................

step 6: Finish the box ..........................................................................................................

step 7: The amplifiers ..........................................................................................................

step 8: Using a cross-over ......................................................................................................

step 9: The 12V battery ........................................................................................................

step 10: Finish the speaker .....................................................................................................

Related Instructables ........................................................................................................... 1

Advertisements ............................................................................................................... 1

Comments ................................................................................................................... 1
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License: Attribution Non-commercial No Derivative Works (by-nc-nd)

Intro: Outdoor 3-Way Speaker Sound System 12VThis is a active speaker construction that works on a 12V battery. The speaker gives you the opportunity to throw a party on any given location.

The first part of the instructable consist of making the speaker box. The second part consist of installing the speakers and the amplifiers.

http://blog.wdka.nl/make/2008/05/13/joris-mobilesoundsystem/

step 1:size of the boxTo determine the size of your speaker boxes you got to have the speaker drivers. For the material of the speaker box best use MDF, it's heavy but relatively cheap anhas a high level of density which makes it perfect for speaker boxes.

You also need some screws, nails (optional), glue, a filler to stuff the box with (like polyfill) and silicon to seal the edges.

For tools you need a saw, screwdriver, centimetre, a drill, compasses and a jigsaw.

I split it into two boxes; one for two sub woofer speakers and one for three woofers and two tweeters.

To determine the size of your boxes check the optimal volume and displacement for each driver. For the two 15 inch sub woofers I use a case os 92 by 65 by 40 cm(internal dimensions) For the other case I use 92 by 65 by 30. The MDF I use is 15mm thick.
http://blog.wdka.nl/make/2008/05/13/joris-mobilesoundsystem/http://creativecommons.org/licenses/by-nc-nd/2.5/


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step 2:putting the pieces togetherSaw the MDF into the right dimensions and put these together using the nails the screws and the glue.

Image Notes1. nail

2. screw3. glue

step 3:Using bracesUse braces to prevent the box from flexing. A brace is a piece of wood inside of the box. There are different ways a speaker can be braced:

Image Notes1. triangle2. square3. round


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step 4:Using battansBattans is another type of bracing that is used to secure all the edges of the box. It is a thin piece of wood that runs along the joints of the box. It does't need to cover tentire length, about 2/3 should do it.

Image Notes1. battan

step 5:

Making the speaker holes

For the making of the speaker holes you need a jigsaw. Put the actual speaker on the place where you want the hole to be. Allign these, subtract 1 to 1.5 cm with youcompasses. Drill a hole in the middle so you can put the jigsaw in. When you have done this you can start sawing out the hole.

Image Notes1. drill to start the hole

Image Notes1. jigsaw to finish the hole


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Image Notes1. the wood work finished

step 6:Finish the boxNow you can assemble the parts. I've put the top in a little deeper so and covered the sides with a l ittle piece of wood (same as I 've used for the battans). This way, wI put the speakers in it they don't stand out.

Since my mobile sound system is going to be used outdoors I needed something to protect the wood from mother nature. I therefore used not regular paint but tar. Thdoesn't really look very smooth, but it will protect my speakers better than regular household paint.

So the speaker box is almost ready now, only got to stuff it and silicon the inner edges. With the stuffing I'm going to wait for a while because I'm first going to build in amplifiers.

(note: when using silicon to seal the edges, wait at least one day to put in the speakers, the fumes can eat away your speakers)


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step 7:The amplifiersFor the total of 7 speakers I use 3 amplifiers. One for the bass, one for the mids and one for the tweeters. Since the bass uses the most power, it's recommandeble togive the bass the amplifier with the highest output.

I use car amplifiers because they are already set for working on a 12V battery.

Installing the amps:

Put a little strip of rubber between the the amp and the wood, then screw the amp to the speaker box. It's now a lit tle shock proof.

Connection the amps:

You need to drill some holes in the speaker box, for each amp 3 holes for power, and in each box 2 holes for your line input. I also put a "threw" in one of the boxes (2holes).

The power connection from a 12V amplifier contains three switches, a GND, a RMT and a +12V:-The GND is the GROUND and is supposed to be connected to the - on the battery.

-The RMT is the REMOTE, this is supposed to be the switch that turns the amp on and off. You can use a actual switch here, I didn't use a switch. I switch it in manuaconnecting it on and off the 12V battery. The RMT is supposed to be connected to the + on the battery. (Note: if the RMT doesn't get power, the amp doesn't work,because it's "off")

-The +12V is supposed to be connected to the + on the 12V battery

For the line-in, the amps have a tulp connection. Since I go from one source to three amps I needed to split the signal. I therefore used 2 X "2x tulp female to 2x tulp m/ 2x tulp female".

Use the speaker connection from the amp to connect your speakers. If you only connect 1 speaker to each amplifier you can use the bridged connection. If you use mthan one speaker try to use equal speakers. Don't connect three or five, always try to equalize the output. Best just don't use more than two speakers directly for eachamp. Except when the amp has more outputs.


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Image Notes1. the amp I used for the bass speakers

Image Notes1. the amp I used for the mids

Image Notes1. the amp I used for the tweeters

Image Notes1. connect to -2. switch connect to +3. 12V connect to +4. speaker connection

Image Notes1. line input2. build-in cross over (see next step)

Image Notes1. rubber strip2. line in3. speaker out4. power5. speaker box stuffed


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step 8:Using a cross-overIn a 3-way system you split the frequency (hertz) that every amp sends to the speakers. This way the bass gets only the low frequencies, the mid speakers the midfrequencies etc. Therefore you use a cross-over. I was lucky that most amplifiers I used already contained a cross-over. I used one extra passive cross-over.

Image Notes1. the extra passive cross over I've used

Image Notes1. A build in cross over

step 9:The 12V batteryThe battery that I use is 105Ah. With the use of Ohm's law you can calculate the time the battery should run on your system.

When using such a amount of power from a 12V battery make sure you use thick power cables, else your system simply doesn't get enough power to reach hismaximum.


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Image Notes1. amps connected to the battery

step 10:Finish the speakerNow that everything is installed and the box is stuffed you can screw on the speaker drivers. Make sure that you mount all the screws. To prevent the speaker vibratinon the wood (and making a awful sound) I have placed a piece of carpet in between.

Now you're ready to hook up you're mp3, mic, or whatever you want to connect to the speaker and terrorize your neighbourhood.

peace,joris

Image Notes

Image Notes1. the box stuffed and installed


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1. the carpet to prevent the speaker from vibrating.2. the speaker connected to the 12V battery.

Image Notes1. connection for my MP3 player

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Comments

28 comments Add Comment

Handsome-Ryan says: Jun 19, 2008. 7:30 AM REPI like what you built, the craftsmanship is fantastic, but your instructable is lacking many important details. I respect what you built but since this isinstructables, I'll offer some tips that may benefit others who want to use car audio equipment outside of a car. First, it is important to note that car audiodevices were designed to run off the current from a car's alternatorNOT a car's battery . Unless you invest in a deep cycle battery, this regular cycle ofcharging and discharging will ruin a standard car battery very quickly. Next, in step 7 you completely breezed over calculating the resistance of speakerswhen using more than one per amplifier output. People attempting to replicate this should be aware of what resistance their particular amplifier is capable ohandeling and if you wire speakers to run lower resistance you increase power draw and will discharge your battery much faster. Finally, i t is not usually agood idea to put amplifiers inside speaker boxes because there is not enough air flow and the amplifiers give of a lot of heat that needs to be disapated. I

would sugest mounting the amps to the outside of the boxes rather than the inside to avoid putting them all into power-protect mode just as the party isgetting cranked up. Other than that, I'm very impressed at how well constructed your boxes are and how clean the finished product is. Very nice.

I recently built a miniature version of something similar to this (one amp and two 6.5" speakers) as part of a trailer mounted bicycle stereo.

Stereo Trailer Pic

Trailer Pic 2

xana says: Nov 8, 2009. 6:52 PM REPJust to say there is a lot of air flow in the two boxes because of the mid-range and sub-woofers. but i do agree that it would drain the battery vary fast.

alex-sharetskiy says: Aug 21, 2008. 10:27 AM REPjust get a car battery charger, and run the amps while you're charging the battery, it shouldn't make a difference (kill your battery) if you do that

Lurch says: Sep 20, 2008. 12:40 PM REPKind of defeats the '12V' aspect of it then does it not? You need more than a standard battery charger to make sure it works like that anyway. Mostbattery chargers will throw out around 4A peak, not enough to keep the battery topped up all night and definitely not enough to keep the ampsrunning as well as charge the battery. You may as well do away with the battery and build a decent fixed voltage power supply, or use a better set obatteries that don't need a charger sat on them all night.

alex-sharetskiy says: Sep 20, 2008. 12:47 PM REPi have a charger that can put out 40 amps, and a couple seconds of 100amps

Lurch says: Sep 20, 2008. 1:09 PM REPWell, I didn't say it was impossible, just not practical to. It's generally best not to use car battery chargers to power devices anyway.

slimguy379 says: Sep 30, 2009. 5:50 PM REPwhy do u have the same gauge wire for the remote as you do the power? any specific benefits?

baneat says: Jul 17, 2008. 3:27 PM REPMaybe you should consider some of those strong mesh covers for the drivers so people can't poke holes in them..

DIY Dave says: Jul 4, 2009. 3:49 PM REPWhere do they sell mesh covers for speakers?

baneat says: Jul 6, 2009. 10:29 AM REPYou're on a DIY site, come on. really? they would be very easy to make.

Rs master says: Jul 4, 2009. 7:48 PM REPhow would I go about make a backpack one with the same power or would it be to damn heavy

bobmcbob_345 says: Mar 26, 2009. 3:56 PM REPYou should make a place inside the cabnets to put the 12 v battery in. It could help save a litt le space
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hell_raiser_1 says: Feb 20, 2009. 4:50 PM REPHow about adding a usb, ipod, cd, car stereo. you could also add a power invertor or something like that... NICE WORK

Henkies says: Oct 5, 2008. 6:41 AM REPHow long does it run, following your experience?

Handsome-Ryan says: Jun 19, 2008. 6:58 AM REPHow are you using Ohms law to calculate run time? There are so many factors affecting run time including amplifier gain settings, ambient temperature, thenon-linear discharge rate of the battery, and even the volume and type of music being played.

alex-sharetskiy says: Sep 20, 2008. 12:49 PM REPget an amp meter, play music for a muinute, check how many amps are drawn, then TRY to calculate

i8_power_shooter_18 says: Jul 16, 2008. 10:07 PM REPHey bro that is awesome.If u could give me a little help with something im a big bicycle rider an i want a stereo system for my bicycle odd tho it would beawesome lol.I got a mp3 player id like to use along with a few speakers nothing big as the ones that u got lol.Could u tell me what wiring or amp or just whawould need i want it to have good bass if u would please give me a email on [email protected] or just on here or anybody knowing whatneed to do this thank you.

alex-sharetskiy says: Sep 20, 2008. 12:48 PM REPjust get computer speakers, and power them with an RC car battery

DIY Dave says: Aug 23, 2008. 2:37 PM REPVery professional looking

pepitosbazzeguti says: Aug 12, 2008. 1:47 PM REPGreat work........Is this system good for music instruments too ?

abadfart says: Aug 12, 2008. 1:42 PM REPor i could put it in a trailer so we can use the truck for the drums

abadfart says: Aug 12, 2008. 1:36 PM REPnice can you run a guitar through it maybe my friend and i can mount speakers on Thelma (his truck) or in my car for shows

sinous says: Aug 11, 2008. 12:06 AM REPInformation is wide ranging and a good start. My only issues are a) Impedence and wiring - more info/? eg bcae1.com b) Running time - how long? c) Usincar woofers off a car battery - what about using a pro 15" which will be about 9dB louder for the same power(less low bass though)-giving you longer runtime. This is where u can get alot more out of the same battery - being louder to start with - not by adding bigger amps. d) How to charge(without ruiningbattery) *SPL: 97 dB 1W/1m

DJNASHA says: Jun 30, 2008. 5:49 PM REPi love it .i wish i'd seen this sooner be for i started my d.j biz keep it coming make more bro

thefreshlettuce says: Jun 17, 2008. 8:40 PM REPHow much did this cost? It looks fantastic!

slimguy379 says: Jun 18, 2008. 4:00 AM REPyes very cool but I too would like to know how much this cost because this seems quite expensive because you have 3 amps- $30 (that's a steal for caamp!!!) mdf at least 6 sheets of mdf - $8 and the speakers look new so.... Well I'm not going to try to put a price tag on 5 huge speakers. but then againyou made the thing so I'll let you explain the price issue

paprika killer says: Jun 18, 2008. 11:23 AM REPmy guess will be between $120 and $175.
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13/13

bumpus says: Jun 17, 2008. 7:40 PM REPThat looks really professional, i would buy it :D
http://www.instructables.com/id/Outdoor-3-Way-Speaker-Sound-System-12V/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/bumpus/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/bumpus/?utm_source=pdf&utm_campaign=comments

outdoor 3 way speaker sound system 12v

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