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Old 27th August 2013, 10:41 PM   #1
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Default Made a 2 speaker shoebox "boombox" want to amplify

I have no experience with wiring,speakers,onhms etc,..but know how to use a multimeter for certain automotive related repairs..

I decided to try and make a 2 speaker stereo, and fit them in my shoebox,..eventually got everything wired to a 3.5mm headphone jack to use with my phone..powered on and works,..but low volume for my taste

The way i wired the speakers was negative to negative from each speaker, with 2 wires from the headphone jack connected to those wires, and each positive of each speaker connected to 2 wires on the headphone jack,..so if i decide to cut off the jack ive got left(-)(+) right(-)(+) to solder onto an amplifier(Did i wire my speakers series parralel,?) (4 wires total on headphone jack)

My question is each speaker is 3 ohms 2 watts max,..what kind of amplifier can i make or buy that will work with these using a 9v/12v battery,..ive got a LM386 DIY , and PAM8403 3 watt dual channel bookmarked...i want to push 1 watt to each speaker and 2.5 ohms on each speaker(sound right?)

If someone could make a wire diagram of my setup with a added amplifier configuration,

im new to this stuff, and decided to start learning
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File Type: jpg IMG_20130827_181023.jpg (312.9 KB, 153 views)
File Type: jpg IMG_20130827_181107.jpg (488.3 KB, 143 views)

Last edited by Nex4; 28th August 2013 at 12:43 AM.
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Old 28th August 2013, 12:28 AM   #2
DUG is offline DUG  Canada
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Place a divider in the box to separate R from L.

Find a 5 ohm 5watt resistor and place in series with each of the + speaker leads and try a pair of LM386 amps.

Have fun learning.
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Old 28th August 2013, 12:51 AM   #3
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Quote:
Originally Posted by Nex4 View Post

im new to this stuff, and decided to start learning
you're on the right track




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Old 28th August 2013, 03:16 PM   #4
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Quote:
Originally Posted by DUG View Post
Place a divider in the box to separate R from L.

Find a 5 ohm 5watt resistor and place in series with each of the + speaker leads and try a pair of LM386 amps.

Have fun learning.
Whats a divider?

heres my speaker setup in a circuit

Mount the resistor like this? and how would i wire both LM386's?
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File Type: jpeg speaker-box 2.JPEG (62.9 KB, 30 views)
File Type: png unnamed-circuit-2.png (20.1 KB, 27 views)
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Old 28th August 2013, 06:08 PM   #5
Mihkus is offline Mihkus  Estonia
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Id put the drivers in seriers and drive them with any amp...
6 ohms... In series they would be 1,5R that would be a bit too low, therefore
Id get tda2003/2040, and smack the speakers with 10W!
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Old 29th August 2013, 09:08 AM   #6
Mihkus is offline Mihkus  Estonia
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Theres no need for any freakin resistor!
The way Id wire this thing it would look like this:

Click the image to open in full size.
print screen

Then wire it to ur 386, solder both signal wires together and you get mono signal.
2 gnds too..

If you want stereo... Then theres no need anyway. You need 2 speakers but they should be alot further away from eachother.

Last edited by Mihkus; 29th August 2013 at 09:11 AM.
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Old 29th August 2013, 09:44 AM   #7
AndrewT is offline AndrewT  Scotland
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I agree with Mik,
there is no point in trying to get stereo from one box.
There is no point in using lower impedance, by paralleling, than necessary.
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Old 29th August 2013, 02:04 PM   #8
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I've tried mono setup and they crackled for some reason, I went back to stereo and they sound clearer and no crackle,...

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Old 29th August 2013, 03:09 PM   #9
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I see since i would wire them in series i equal the 6 ohms of the speakers and decrease watts needed, to get 6 ohms for both..then i can push 4+ watts without getting hot..., if i want stereo through the amp i would wire them in parallel which would defeat/burn the amp? so then i would wire each speaker into 1 lm386 each and tie both amps into 1 switch,1 potentialmeter?
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