Hi everybody, I'm Simone and this is my first post. 🙂
I had this JBL speaker laying around for a long time. Recently I decided to give it a new use. I do not have much 'know how' with speakers and electronics but, here's my project:
I want to create a mono, amplified speaker that I would be able to use by plugging in a normal 3.5 aux stereo cable, from a smartphone or a laptop for example.
The speaker (pictures attached) is a pretty old 3 way JBL, 4 Ohm, 5-110 Watt, model GTC 9615. (Do you think it's still usable given the poor manteinance condition?)
I looked online for an amplifier and I found this: http://store.sure-electronics.com/aa-ab31211
It's underpowered but it's the best I could find. I also found also on the same website a mono, 100w but at 2 Ohm :-/
The I/O ports on it are pretty straight forward, there are 2 things that I am not sure how to do though:
1) How can I connect a 3.5 stereo AUX to a mono RCA (merging the 2 channels)?
2) If I want to add a potentiometre to regulate the volume, where and how should I add it? (between the output audio and the speaker?) And how powerful should it be?
When and if all the electronic parts will be working once put together, I would like to build a transparent box (I don't recall the technical term) for it. And, only by then, I will need guidance for the material and the measures 🙂
Thanks a lot to everybody that will try to help me!! 😀
PS Sorry if my English was bad
I had this JBL speaker laying around for a long time. Recently I decided to give it a new use. I do not have much 'know how' with speakers and electronics but, here's my project:
I want to create a mono, amplified speaker that I would be able to use by plugging in a normal 3.5 aux stereo cable, from a smartphone or a laptop for example.
The speaker (pictures attached) is a pretty old 3 way JBL, 4 Ohm, 5-110 Watt, model GTC 9615. (Do you think it's still usable given the poor manteinance condition?)
I looked online for an amplifier and I found this: http://store.sure-electronics.com/aa-ab31211
It's underpowered but it's the best I could find. I also found also on the same website a mono, 100w but at 2 Ohm :-/
The I/O ports on it are pretty straight forward, there are 2 things that I am not sure how to do though:
1) How can I connect a 3.5 stereo AUX to a mono RCA (merging the 2 channels)?
2) If I want to add a potentiometre to regulate the volume, where and how should I add it? (between the output audio and the speaker?) And how powerful should it be?
When and if all the electronic parts will be working once put together, I would like to build a transparent box (I don't recall the technical term) for it. And, only by then, I will need guidance for the material and the measures 🙂
Thanks a lot to everybody that will try to help me!! 😀
PS Sorry if my English was bad
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If you are going to buy from Sure then this one would be better as it is a mono amp.
Sure Electronics' webstore 1 X 60Watt Class D Audio Amplifier Board -TPA3118
You will need a couple of resistors to sum the two music channels...100-500 ohms will work.
Sure Electronics' webstore 1 X 60Watt Class D Audio Amplifier Board -TPA3118
You will need a couple of resistors to sum the two music channels...100-500 ohms will work.
Hi,
Its a bad idea. The speaker is in a very poor state
and in real life will need nothing like 60W rms.
As a 3 way with a very crude x/o it will sound grim.
FWIW you simply can't build such "lifestyle" products
with no knowledge and get anywhere near the sort of
performance commercial products offer at the same price.
rgds, sreten.
Its a bad idea. The speaker is in a very poor state
and in real life will need nothing like 60W rms.
As a 3 way with a very crude x/o it will sound grim.
FWIW you simply can't build such "lifestyle" products
with no knowledge and get anywhere near the sort of
performance commercial products offer at the same price.
rgds, sreten.
What does "x/o" mean? could you explain this sentence better?
Also, what does FWIW stand for?
Thank you!
Vasto, you have a speaker you want to use.
Use it.
Build what you want with it.
Have fun.
Learn.
If you have nothing else it will sound great...until something better comes along.
Enjoy.
Use it.
Build what you want with it.
Have fun.
Learn.
If you have nothing else it will sound great...until something better comes along.
Enjoy.
I fell like you guys have both gave me good advice.
Practically speaking this isn't a worthy project, but, as DUG suggested, I was mostly interested in spending time learning and have fun creating something that I never did.
So I think I will actually try to build something.
DUG, you said I can sum the stereo channels in one with some resistors, can you explain me how? Or maybe do you know some tutorials/explenations I could take a look at?
Thank you!
Practically speaking this isn't a worthy project, but, as DUG suggested, I was mostly interested in spending time learning and have fun creating something that I never did.
So I think I will actually try to build something.
DUG, you said I can sum the stereo channels in one with some resistors, can you explain me how? Or maybe do you know some tutorials/explenations I could take a look at?
Thank you!
The two resistors should be high enough in value that the device driving them can "ignore" the signal from the other channel.
If you just hook them together then the amplifier outputs will be fighting each other...not good.
Since typical headphones are 30-50 ohms then 100 to 200 ohm resistors in the passive combiner will work.
If you just hook them together then the amplifier outputs will be fighting each other...not good.
Since typical headphones are 30-50 ohms then 100 to 200 ohm resistors in the passive combiner will work.
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