I am looking to wire up a bunch of 8-ohm, 40W audio transducers to my deck, to give me some waterproof sound outside.
I am using a streaming music server, pulling from my NAS, with web front-end.
But, how to wire? Series, parallel, a mix of both? Pros and cons of each?
My amplifier is good for 35W at 8 ohms and I am looking to use four transducers per channel.
Testing with one per channel gave great results, but I want to spread the transducers over a greater area.
I think this is the way I want/need to wire it, but don't understand why the designer transposed the polarity. Any guidance gratefully received: http://www.instructables.com/files/orig/FO7/51RE/GPBDHQCL/FO751REGPBDHQCL.pdf
I am using a streaming music server, pulling from my NAS, with web front-end.
But, how to wire? Series, parallel, a mix of both? Pros and cons of each?
My amplifier is good for 35W at 8 ohms and I am looking to use four transducers per channel.
Testing with one per channel gave great results, but I want to spread the transducers over a greater area.
I think this is the way I want/need to wire it, but don't understand why the designer transposed the polarity. Any guidance gratefully received: http://www.instructables.com/files/orig/FO7/51RE/GPBDHQCL/FO751REGPBDHQCL.pdf
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Zoot -
Use a combination of series (transducers wired from circuit + to transducer +, then transducer - to next transducer +, and so on around in a loop) and parallel (each transducer wired across from circuit positive to circuit negative) to get the correct impedance for your amplifier.
What your link shows is a mixed series/parallel circuit where the top and bottom four speaker sets are each wired in parallel (8 ohms/4 = 2 ohms) and the two circuits are wired together in series (2+2 ohms) for a total of 4 ohms impedance.
This circuit as diagrammed should work reasonably well, as long as your amplifier has enough reserve current to drive a fairly low resistive load without tripping its protection circuitry.
The issue is that the actual resistance of each transducer will be closer to 6 ohms so the actual current resistance will be (6/4 = 1.5) x 2 = 3 ohms - which for speakers would be acceptable, but my hunch is that your transducers may have sufficiently stiff current requirements to overload your amp.
In which case, rearrange the diagram so that two sets of 2 transducers are wired in series (16 ohms impedance each), and then the sets are wired in parallel for 16 / 2 = 8 ohms impedance - and do this for each stereo channel.
I hope this makes sense ...
Cheers
Jim
Use a combination of series (transducers wired from circuit + to transducer +, then transducer - to next transducer +, and so on around in a loop) and parallel (each transducer wired across from circuit positive to circuit negative) to get the correct impedance for your amplifier.
What your link shows is a mixed series/parallel circuit where the top and bottom four speaker sets are each wired in parallel (8 ohms/4 = 2 ohms) and the two circuits are wired together in series (2+2 ohms) for a total of 4 ohms impedance.
This circuit as diagrammed should work reasonably well, as long as your amplifier has enough reserve current to drive a fairly low resistive load without tripping its protection circuitry.
The issue is that the actual resistance of each transducer will be closer to 6 ohms so the actual current resistance will be (6/4 = 1.5) x 2 = 3 ohms - which for speakers would be acceptable, but my hunch is that your transducers may have sufficiently stiff current requirements to overload your amp.
In which case, rearrange the diagram so that two sets of 2 transducers are wired in series (16 ohms impedance each), and then the sets are wired in parallel for 16 / 2 = 8 ohms impedance - and do this for each stereo channel.
I hope this makes sense ...
Cheers
Jim
Jim and Mike, thanks very much.
Exactly the sort of knowledgeable help I have come to enjoy on this forum!
Off to the cave to fiddle and fidget! 🙂
Exactly the sort of knowledgeable help I have come to enjoy on this forum!
Off to the cave to fiddle and fidget! 🙂
If they are actually 'exciters' then I suggest listening to them for an extended period BEFORE making any permanent plans for them.
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