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Topic: Car Speaker & small amp problems (Read 3832 times)
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EvilGreenDevil
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Car Speaker & small amp problems
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on:
March 22, 2012, 07:46:54 am »
Building my first cabinet and ran into a little bit of a disappointment when my audio orders arrived yesterday and I couldn't get things working. I was hoping someone could help. Building a bartop cabinet that will use 4" speakers as most do. I found a link to a cheap "mini/motorcycle" amp through researching other threads that is suppose to run on 12V. I'm thinking that wiring a molex connector from my 450w PC power supply should be enough to power it.
I did the wiring for the power and connected it to the amp, success (at least I thought so given the red power light on the amp went on). I used the 12V line from an extra molex connector and the ground wire next to it. The 12V/ground were then spliced to the corresponding ones to the amp harness.
I went on to connect the +/- terminals to the corresponding wires that came with the amp by a simple connection of the wires and wrapping each one in electrical tape. When I pugged in the speakers i'm getting a faint/dirty hum and no sound from the pc is recognized. I know I'm doing something wrong.
The amp is connected to the audio jack (I've tried front and back) to the PC using a 3.5mm --> RCA split
Speakers:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=269-178
Amp:
http://www.aliexpress.com/product-fm/369889204--New-Red-MP3-Stereo-Amp-Motorcycle-Amplifier--Made-in-China-Cheap-Accept-Paypal-wholesalers.html
Back of amp
Any help would be appreciated
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Xbox360 GT - EvilGreenDevil | twitter - dcmyers
My First Bartop Build
EvilGreenDevil
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Re: Car Speaker & small amp problems
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Reply #1 on:
March 22, 2012, 12:48:08 pm »
It was and right after posting my question I went back to the cabinet to check the audio card settings in windows. I think I had an audio setting checked that I didn't new for stereo/analogue audio.
I get sound now but I'm still getting a minor hum whenever sound isn't being played. I'm assuming it's a grounding issue.
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My First Bartop Build
Drnick
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Plodding Through Life
Re: Car Speaker & small amp problems
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Reply #2 on:
March 22, 2012, 05:28:11 pm »
Indeed it is a grounding issue. I have the exact same amp. You could either try a grounding loop or you could use a separate power supply. I used a 14V 3a or something very close to and that works OK. Ultimately I decided against using it in the Kiosk I was converting and went for a set of Logitech x530's instead. I am now using the amp to run a small sub I had kicking around from an old 5.1 dvd setup.
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Bartop
http://forum.arcadecontrols.com/index.php/topic,121269.0.html
Jukebox
http://forum.arcadecontrols.com/index.php/topic,118409.0.html
Garden
http://forum.arcadecontrols.com/index.php/topic,157271.0.html
Entertainment Ctr
http://forum.arcadecontrols.com/index.php/topic,160984.0.html
NeoGeo
http://forum.arcadecontrols.com/index.php/topic,157547
Its 10 Years now and still no damned redundancy
EvilGreenDevil
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Re: Car Speaker & small amp problems
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Reply #3 on:
March 22, 2012, 06:39:42 pm »
Not sure I'm going that big, mine is a small bar top so I will just be using the car speakers, no sub.
What at your suggestions for a ground loop and where to attach it in the cab if I'm gonna stick with the pc psu?
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My First Bartop Build
Drnick
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Re: Car Speaker & small amp problems
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Reply #4 on:
March 23, 2012, 04:20:17 am »
Do a search for Ground Loop Isolator and see what comes up, you should be able to find something fairly cheaply. I can't really advise on the best one as I just used a separate adadpter to power the amp in the end.
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Bartop
http://forum.arcadecontrols.com/index.php/topic,121269.0.html
Jukebox
http://forum.arcadecontrols.com/index.php/topic,118409.0.html
Garden
http://forum.arcadecontrols.com/index.php/topic,157271.0.html
Entertainment Ctr
http://forum.arcadecontrols.com/index.php/topic,160984.0.html
NeoGeo
http://forum.arcadecontrols.com/index.php/topic,157547
Its 10 Years now and still no damned redundancy
matsadona
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Re: Car Speaker & small amp problems
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Reply #5 on:
March 23, 2012, 06:14:00 am »
Drnick is right. This is a common problem, which I share using my laptop for DJ’ing. You need an isolator and they are pretty cheap.
Here is one found at Radio Shack, which I assume you would find close to were you live.
http://www.radioshack.com/product/index.jsp?productId=2062214
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