Does Mixing Stereo to Mono Require Resistors?

J

Joe

Guest
I have a Philips DVP 642 DVD player connected to a TV set that has only
mono sound, and only one audio input jack.

I want to get both L and R outputs from the DVD player to play on that TV set.

I have heard that the two outputs should not be simply paralled, and
others have said to just get a Y connector, which would just parallel the
two outputs into the one input.

Would someone please tell me the right way to do this?

If a resistor in each output line is recommended, what value for each
resistor? Why are they needed?

What are the possible problems with just paralleling the two outputs?

Thanks.

--- Joe
 
On 12/9/07 5:14 PM, in article
none-0912071714570001@dialup-4.131.141.79.dial1.losangeles1.level3.net,
"Joe" <none@given.now> wrote:

I have a Philips DVP 642 DVD player connected to a TV set that has only
mono sound, and only one audio input jack.

I want to get both L and R outputs from the DVD player to play on that TV set.

I have heard that the two outputs should not be simply paralled, and
others have said to just get a Y connector, which would just parallel the
two outputs into the one input.

Would someone please tell me the right way to do this?

If a resistor in each output line is recommended, what value for each
resistor? Why are they needed?

What are the possible problems with just paralleling the two outputs?

Thanks.

--- Joe
Click to expand...
The outputs are probably LINE OUT impedance, so I wouldn't expect any
problem with tieing them together for a single input. I usually use a pair
of 100k Ohm resistors, but it's probably a waste of 4 cents.
 
Joe wrote:

I have a Philips DVP 642 DVD player connected to a TV set that has only
mono sound, and only one audio input jack.

I want to get both L and R outputs from the DVD player to play on that TV set.

I have heard that the two outputs should not be simply paralled, and
others have said to just get a Y connector, which would just parallel the
two outputs into the one input.

Would someone please tell me the right way to do this?

If a resistor in each output line is recommended, what value for each
resistor? Why are they needed?

What are the possible problems with just paralleling the two outputs?
Click to expand...
Well ..... sometimes the outputs in question already have series resistors
internally, so doing it the 'cheap' way by paralleling may actually work OK but
you do need to be aware that it's not a guaranteed method.

If you hear distortion, then add external resistors. It's HIGHLY unlikely you'll
do any damage by trying paralleling though. Even audio professionals do this when
in a fix.

Graham
 
Don Bowey wrote:

"Joe" <none@given.now> wrote:

I have a Philips DVP 642 DVD player connected to a TV set that has only
mono sound, and only one audio input jack.

I want to get both L and R outputs from the DVD player to play on that TV set.

I have heard that the two outputs should not be simply paralled, and
others have said to just get a Y connector, which would just parallel the
two outputs into the one input.

Would someone please tell me the right way to do this?

If a resistor in each output line is recommended, what value for each
resistor? Why are they needed?

What are the possible problems with just paralleling the two outputs?


The outputs are probably LINE OUT impedance, so I wouldn't expect any
problem with tieing them together for a single input. I usually use a pair
of 100k Ohm resistors, but it's probably a waste of 4 cents.
Click to expand...
100k would be an extraordinarily high value to use. I can't think of any instance
where 1k wouldn't be just fine.

Graham
 
"Joe"
I have a Philips DVP 642 DVD player connected to a TV set that has only
mono sound, and only one audio input jack.

I want to get both L and R outputs from the DVD player to play on that TV
set.

I have heard that the two outputs should not be simply paralled, and
others have said to just get a Y connector, which would just parallel the
two outputs into the one input.

Would someone please tell me the right way to do this?

If a resistor in each output line is recommended, what value for each
resistor?
Click to expand...

** You need to find special stereo resistors.

Theses are easy to tell apart from the usual mono kind since the colour
coded bands read the same in either direction.

Eg: brown, red, red, brown.


What are the possible problems with just paralleling the two outputs?
Click to expand...

** The DVD player will instantly vaporise when left and right energies
combine.




....... Phil
 
Phil Allison wrote:

"Joe"

I have a Philips DVP 642 DVD player connected to a TV set that has only
mono sound, and only one audio input jack.

I want to get both L and R outputs from the DVD player to play on that TV
set.

I have heard that the two outputs should not be simply paralled, and
others have said to just get a Y connector, which would just parallel the
two outputs into the one input.

Would someone please tell me the right way to do this?

If a resistor in each output line is recommended, what value for each
resistor?

** You need to find special stereo resistors.

Theses are easy to tell apart from the usual mono kind since the colour
coded bands read the same in either direction.

Eg: brown, red, red, brown.

What are the possible problems with just paralleling the two outputs?

** The DVD player will instantly vaporise when left and right energies
combine.
Click to expand...
LOL !

Nice one.

Graham
 
How about playing music from the line out thru a diode into an RC...
read the voltage with no series resistor... then put in a pot and
increase R until voltage drops 'some' (.707 or .5 of the open circuit
voltage). The idea is you dont want two low impedance outputs
'fighting' each other. Build out resistors equal to the output
impedance of the line out minimize crosstalk due to mismatch.
 
"BobG" <bobgardner@aol.com> wrote in message
news:20823504-af95-4c43-b184-9d4367496572@x69g2000hsx.googlegroups.com...
How about playing music from the line out thru a diode into an RC...
read the voltage with no series resistor... then put in a pot and
increase R until voltage drops 'some' (.707 or .5 of the open circuit
voltage). The idea is you dont want two low impedance outputs
'fighting' each other. Build out resistors equal to the output
impedance of the line out minimize crosstalk due to mismatch.
Click to expand...
What in the FUGGINGHELL are you talking about?

You need oxygen, buddy.

Bob
 
On Dec 10, 6:57�pm, "BobW" <nimby_NEEDS...@roadrunner.com> wrote:
What in the FUGGINGHELL are you talking about?
You need oxygen, buddy.
=====================================No, if you use the expensive 'oxygen free' wires that are extruded
Click to expand...
from the diffusion furnace using the 'slow pull' technique, they
exhibit the ohmic characteristics of a eutectic alloy at the triple
point. In this exact balanced condition, all the electrons move
through the crystalline lattice structure of the copper much easier
(lower resistance), resulting in lower output impedance at higher
frequencies, which increased the damping factor allowing suppression
of odd harmonics resonances.
 
BobG wrote:

How about playing music from the line out thru a diode into an RC...
read the voltage with no series resistor... then put in a pot and
increase R until voltage drops 'some' (.707 or .5 of the open circuit
voltage). The idea is you dont want two low impedance outputs
'fighting' each other. Build out resistors equal to the output
impedance of the line out minimize crosstalk due to mismatch.
I see they're all coming out of the closet!
Click to expand...


--
"I'd rather have a bottle in front of me than a frontal lobotomy"
http://webpages.charter.net/jamie_5
 
On my disco with a mono amp I just short them together.

If you insist on using resistors then a couple of 1k resistors will do
the job.

www.murtonpikesystems.co.uk
 
On Dec 9, 5:14 pm, n...@given.now (Joe) wrote:
I have a Philips DVP 642 DVD player connected to a TV set that has only
mono sound, and only one audio input jack.

I want to get both L and R outputs from the DVD player to play on that TV set.
Click to expand...
Depending on the stereo phasing, simple connection of
the outputs will work (because those outputs have 1k ohm resistors
built in, you needn't add external resistors). There are some
sources where this fails badly (TV from BBC has some phase-
reversal convention, I've heard sound become unlistenable
when converted to monaural), and simply connecting L channel
and ignoring the R is a better option.
 
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