Converting mon amplified audio out to lstereo line input (line level?) in
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Posted by JazzMan on July 27, 2005, 11:00 pm
Please log in for more thread options I want to use my TV's built in speakers as the center channel for my old ProLogic surround. My TV has stereo audio inputs, my ProLogic receiver/amp has only amplified center outputs in mono. I had thought about trying to take my TV apart and cutting the speaker wires loose from the main board and then running them to a jack (added by me) on the back panel, but the TV is just too heavy for me to work with due to a blown disk. So, I thought about just making a cable that went from the amplified center out on the receiver to the audio input jacks on the TV, turn the receiver center volume way down, the TV volume way down, and then hope for the best, but I think there will be a problem with the linearity of the volume control this way, plus it just seems like an inelegant hack job. My question is, is there a simple, easy way to convert the amplified audio in mono from the receiver/amp to a line level source in stereo? I have a center channel speaker but can't use it because it physically won't fit within 5' of the TV where I've got it mounted now. Thanks! JazzMan -- ********************************************************** Please reply to jsavage"at"airmail.net. Curse those darned bulk e-mailers! ********************************************************** "Rats and roaches live by competition under the laws of supply and demand. It is the privilege of human beings to live under the laws of justice and mercy." - Wendell Berry ********************************************************** | |||||||||||||
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Posted by PeteS on July 28, 2005, 7:37 am
Please log in for more thread options Well, if you are trying to make a mono input (on stereo outputs), then simply sum the channels. Take your left and right channels, from now on L and R Now use a simple summing amplifier to yield L+R. There's your mono output. You may want to buffer each of the inputs to the summing amp. Cheers PeteS | |||||||||||||
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Posted by JazzMan on July 29, 2005, 12:47 am
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PeteS wrote: I need to go the other way. I have a mono amplified output from a receiver/amplifier, this output is designed to run a center speaker. The TV has stereo line-level inputs to run the stereo speakers in the front of the TV. The only reason I want to convert mono to stereo is so that both TV speakers are being used, otherwise the center channel audio will be off center. The TV doesn't have a mono input. JazzMan -- ********************************************************** Please reply to jsavage"at"airmail.net. Curse those darned bulk e-mailers! ********************************************************** "Rats and roaches live by competition under the laws of supply and demand. It is the privilege of human beings to live under the laws of justice and mercy." - Wendell Berry ********************************************************** | |||||||||||||
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Posted by Michael Black on July 29, 2005, 5:58 am
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JazzMan (No_Spam@airmail.net) writes: > PeteS wrote:
>>
>> Well, if you are trying to make a mono input (on stereo outputs), then >> simply sum the channels. >> >> Take your left and right channels, from now on L and R >> >> Now use a simple summing amplifier to yield L+R. There's your mono >> output. You may want to buffer each of the inputs to the summing amp. >> >> Cheers >> >> PeteS >
Then your original question wasn't clear. At the very least it
> I need to go the other way. I have a mono amplified output > from a receiver/amplifier, this output is designed to run > a center speaker. The TV has stereo line-level inputs to > run the stereo speakers in the front of the TV. > > The only reason I want to convert mono to stereo is so that > both TV speakers are being used, otherwise the center channel > audio will be off center. The TV doesn't have a mono input. > was too cluttered. Take the mono signal, and feed it into both audio channels of the tv set. You can get y-adaptors that will do this, or just get a cable that fits into your receiver and splice it to a cable that will fit into your tv set. Wire the two tv set end plugs in parallel __________left jack of tv set | signal--------| |__________right jack of tv set ground--------ground of tv set If you're fussy about signal levels, then add an attenuator at the output of the receiver, a pair of resistors. Michael | |||||||||||||
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Posted by JazzMan on July 29, 2005, 2:26 am
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Michael Black wrote: >
> JazzMan (No_Spam@airmail.net) writes: > > PeteS wrote:
> >>
> >> Well, if you are trying to make a mono input (on stereo outputs), then > >> simply sum the channels. > >> > >> Take your left and right channels, from now on L and R > >> > >> Now use a simple summing amplifier to yield L+R. There's your mono > >> output. You may want to buffer each of the inputs to the summing amp. > >> > >> Cheers > >> > >> PeteS > >
> > I need to go the other way. I have a mono amplified output > > from a receiver/amplifier, this output is designed to run > > a center speaker. The TV has stereo line-level inputs to > > run the stereo speakers in the front of the TV. > > > > The only reason I want to convert mono to stereo is so that > > both TV speakers are being used, otherwise the center channel > > audio will be off center. The TV doesn't have a mono input. > > > Then your original question wasn't clear. At the very least it
> was too cluttered. > > Take the mono signal, and feed it into both audio channels of > the tv set. You can get y-adaptors that will do this, or just > get a cable that fits into your receiver and splice it to a cable > that will fit into your tv set. Wire the two tv set end plugs > in parallel > __________left jack of tv set > | > signal--------| > |__________right jack of tv set > > ground--------ground of tv set > > If you're fussy about signal levels, then add an attenuator at the output > of the receiver, a pair of resistors. > > Michael Yes, I was aware my original question was not clear enough, but I'm glad I got my though across on the second try. :) For attenuation, is a resistor enough? What about issues of scaling, i.e. small changes in amplifier output produce wide changes of volume on the TV speakers? JazzMan -- ********************************************************** Please reply to jsavage"at"airmail.net. Curse those darned bulk e-mailers! ********************************************************** "Rats and roaches live by competition under the laws of supply and demand. It is the privilege of human beings to live under the laws of justice and mercy." - Wendell Berry ********************************************************** | |||||||||||||
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> Well, if you are trying to make a mono input (on stereo outputs), then
> simply sum the channels.
>
> Take your left and right channels, from now on L and R
>
> Now use a simple summing amplifier to yield L+R. There's your mono
> output. You may want to buffer each of the inputs to the summing amp.
>
> Cheers
>
> PeteS