26 Aug
2012
26 Aug
'12
3:10 a.m.
Input 2 1/4" phono (stereo output from a keyboard or computer sound
card, not a guitar) and turn it into a SINGLE balanced XLR output?
I did some quick searching via Google and found units that out put TWO
XLR channels - one for each input channel. But that's not what I'm
looking for.
--
David
gnome(a)hawaii.rr.com
authenticity, honesty, community
http://clanjones.org/david/
http://dancing-treefrog.deviantart.com/
26 Aug
26 Aug
3:24 a.m.
XLR leads are mono right? So if you're putting in a stereo signal to the
DI, you're going to have two XLR outs: keeping the stereo.
If you're determined to get the signals to one XLR either combine the
stereo to mono, or just use one output of your synth. By using one XLR at
*any* point in the signal chain you're going to lose your stereo image. Why
not use 2 XLR's?
-Harry
On Sun, Aug 26, 2012 at 2:10 AM, david <gnome(a)hawaii.rr.com> wrote:
Input 2 1/4" phono (stereo output from a keyboard
or computer sound card,
not a guitar) and turn it into a SINGLE balanced XLR output?
I did some quick searching via Google and found units that out put TWO XLR
channels - one for each input channel. But that's not what I'm looking for.
--
David
gnome(a)hawaii.rr.com
authenticity, honesty, community
http://clanjones.org/david/
http://dancing-treefrog.**deviantart.com/<http://dancing-treefrog.devian…
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4:09 a.m.
On 26/08/12 09:24, Harry van Haaren wrote:
XLR leads are mono right? So if you're putting in
a stereo signal to the
DI, you're going to have two XLR outs: keeping the stereo.
If you're determined to get the signals to one XLR either combine the
stereo to mono, or just use one output of your synth. By using one XLR at
*any* point in the signal chain you're going to lose your stereo image. Why
not use 2 XLR's?
-Harry
On Sun, Aug 26, 2012 at 2:10 AM, david<gnome(a)hawaii.rr.com> wrote:
> Input 2 1/4" phono (stereo output from a keyboard or computer sound card,
> not a guitar) and turn it into a SINGLE balanced XLR output?
there are only 3 contacts in the usual XLR, so it can be a mono balanced
connection or a stereo unbalanced ... you would need a 5 pin connector for
stereo balanced, certainly there are such beasts but they are much less common.
Simon
9:24 a.m.
Thanks, Simon and Harry. I sent the message off, then a while later
thought, "Bet I'll just have to combine the stereo to a mono and put
that into a standard DI."
I'd love to use 2 XLRs, but we don't have enough channels on our snake
anymore (combination of some added singers and one non-working line in
the snake).
On 08/25/2012 04:09 PM, Simon Wise wrote:
On 26/08/12 09:24, Harry van Haaren wrote:
--
David
gnome(a)hawaii.rr.com
authenticity, honesty, community
http://clanjones.org/david/
http://dancing-treefrog.deviantart.com/
XLR leads are mono right? So if you're
putting in a stereo signal to the
DI, you're going to have two XLR outs: keeping the stereo.
If you're determined to get the signals to one XLR either combine the
stereo to mono, or just use one output of your synth. By using one XLR at
*any* point in the signal chain you're going to lose your stereo
image. Why
not use 2 XLR's?
-Harry
On Sun, Aug 26, 2012 at 2:10 AM, david<gnome(a)hawaii.rr.com> wrote:
> Input 2 1/4" phono (stereo output from a keyboard or computer sound
> card,
> not a guitar) and turn it into a SINGLE balanced XLR output?
there are only 3 contacts in the usual XLR, so it can be a mono balanced
connection or a stereo unbalanced ... you would need a 5 pin connector
for stereo balanced, certainly there are such beasts but they are much
less common.
Simon 
9:53 a.m.
On Sat, 2012-08-25 at 21:24 -1000, david wrote:
Thanks, Simon and Harry. I sent the message off, then
a while later
thought, "Bet I'll just have to combine the stereo to a mono and put
that into a standard DI."
If you can't use just the left or right output, but need both, than you
should decouple the left and right to merge them.
http://img236.imageshack.us/img236/7269/smadapterll8.jpg
If the DI box does use transformers, decoupling by resistors might cause
a high-path filter.
Regards,
Ralf
10:05 a.m.
On Sun, 2012-08-26 at 09:52 +0200, Ralf Mardorf wrote:
On Sat, 2012-08-25 at 21:24 -1000, david wrote:
PS: If the DI box does use op-amps you won't get a high-pass. Even a
high-pass might be inaudible. If you connect left and right without
resistors, you might not get distortion, depending to the outputs of the
keyboard. Doesn't the keyboard provide mono? Sometimes using the left
channel only will add the right channel automatically.
I might be mistaken, but you at least should google.
Thanks, Simon and Harry. I sent the message off,
then a while later
thought, "Bet I'll just have to combine the stereo to a mono and put
that into a standard DI."
If you can't use just the left or right output, but need both, than you
should decouple the left and right to merge them.
http://img236.imageshack.us/img236/7269/smadapterll8.jpg
If the DI box does use transformers, decoupling by resistors might cause
a high-path filter.
Regards,
Ralf 
7:09 p.m.
On 08/26/2012 02:24 AM, david wrote:
Thanks, Simon and Harry. I sent the message off, then
a while later
thought, "Bet I'll just have to combine the stereo to a mono and put
that into a standard DI."
I'd love to use 2 XLRs, but we don't have enough channels on our snake
anymore (combination of some added singers and one non-working line in
the snake).
One way that comes to mind is to convert the stereo signal to digital
and send the digital signal over the balanced pair. This might be an
overly-complex approach -- so it depends on how much you /really/ want
to preserve the stereo signal. :-)
One chain I can think of is:
Analog[Stereo] --> S/PDIF(unbalanced) --> AES(balanced XLR)
--> S/PDIF(unbalanced) --> Analog[Stereo]
There's several $40 devices out ther for the analog/spdif conversion.
The spdif to AES conversion could probably be done with a couple of Hosa
CDL-313 boxes (about $80). (But I'm new to SPDIF and AES so I might be
missing something.)
A cheaper way that *might* work to send S/PDIF over XLR is to run the
S/PDIF signal through a couple DI's. Since the S/PDIF signal is pretty
resistant to noise -- I think this is pretty likely to work.
-gabriel
8:07 p.m.
On Sun, 2012-08-26 at 12:09 -0500, Gabriel M. Beddingfield wrote:
On 08/26/2012 02:24 AM, david wrote:
Wouldn't this cause cross-talk? "Received" digital noise by the analog
cables, that are parallel to the digital cable?
Thanks, Simon and Harry. I sent the message off,
then a while later
thought, "Bet I'll just have to combine the stereo to a mono and put
that into a standard DI."
I'd love to use 2 XLRs, but we don't have enough channels on our snake
anymore (combination of some added singers and one non-working line in
the snake).
One way that comes to mind is to convert the stereo signal to digital
and send the digital signal over the balanced pair. This might be an
overly-complex approach -- so it depends on how much you /really/ want
to preserve the stereo signal. :-)
One chain I can think of is:
Analog[Stereo] --> S/PDIF(unbalanced) --> AES(balanced XLR)
--> S/PDIF(unbalanced) --> Analog[Stereo]
There's several $40 devices out ther for the analog/spdif conversion.
The spdif to AES conversion could probably be done with a couple of Hosa
CDL-313 boxes (about $80). (But I'm new to SPDIF and AES so I might be
missing something.)
A cheaper way that *might* work to send S/PDIF over XLR is to run the
S/PDIF signal through a couple DI's. Since the S/PDIF signal is pretty
resistant to noise -- I think this is pretty likely to work.
-gabriel
9:07 p.m.
On 08/26/2012 01:06 PM, Ralf Mardorf wrote:
> One way that comes to mind is to convert the
stereo signal to digital
> and send the digital signal over the balanced pair. This might be an
> overly-complex approach -- so it depends on how much you /really/ want
> to preserve the stereo signal. :-)
[snip]
Wouldn't this cause cross-talk? "Received" digital noise by the analog
cables, that are parallel to the digital cable?
I'm not an authority on the subject -- but I would expect that
cross-talk would not be a problem, since all the signals are being sent
over a balanced pair.
-gabriel
9:16 p.m.
On Sun, Aug 26, 2012 at 02:07:22PM -0500, Gabriel M. Beddingfield wrote:
On 08/26/2012 01:06 PM, Ralf Mardorf wrote:
* SPDIF isn't balanced, not even impedance balanced. AES is.
* SPDIF or AES probably won't survive a standard snake cable
of any practical length. SPDIF requires coaxial, AES requires
110 ohm screened twisted pair.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
>One way that comes to mind is to convert the
stereo signal to digital
>and send the digital signal over the balanced pair. This might be an
>overly-complex approach -- so it depends on how much you /really/ want
>to preserve the stereo signal. :-)
[snip]
Wouldn't this cause cross-talk? "Received" digital noise by the analog
cables, that are parallel to the digital cable?
I'm not an authority on the subject -- but I would expect that
cross-talk would not be a problem, since all the signals are being
sent over a balanced pair.
10:14 p.m.
On Sun, Aug 26, 2012 at 2:16 PM, Fons Adriaensen <fons(a)linuxaudio.org> wrote:
On Sun, Aug 26, 2012 at 02:07:22PM -0500, Gabriel M.
Beddingfield wrote:
FWIW, I was proposing to put balanced AES through the snake.
On 08/26/2012 01:06 PM, Ralf Mardorf wrote:
I'm not an authority on the subject -- but I would expect that
cross-talk would not be a problem, since all the signals are being
sent over a balanced pair.
* SPDIF isn't balanced, not even impedance balanced. AES is. * SPDIF or AES probably won't survive a standard
snake cable
of any practical length. SPDIF requires coaxial, AES requires
110 ohm screened twisted pair.
OK, I didn't catch that AES required a shielded cable. Thanks!
-gabriel
11:09 a.m.
On Sat, Aug 25, 2012 at 03:10:38PM -1000, david wrote:
Input 2 1/4" phono (stereo output from a keyboard
or computer sound
card, not a guitar) and turn it into a SINGLE balanced XLR output?
I did some quick searching via Google and found units that out put
TWO XLR channels - one for each input channel. But that's not what
I'm looking for.
Never seen one. Repair the snake ? If it's one of those with
the cable flaring out to a number of very thin ones with an
XLR on each, you can be 99% sure the defect is at one of the
ends. Thin cable gets pulled, cable clamp in the XLR isn't
designed to hold it, one or two signal wires break inside
the XLR.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
2:35 p.m.
On 08/25/2012 09:10 PM, david wrote:
Input 2 1/4" phono (stereo output from a keyboard
or computer sound
card, not a guitar) and turn it into a SINGLE balanced XLR output?
I did some quick searching via Google and found units that out put TWO
XLR channels - one for each input channel. But that's not what I'm
looking for.
Whirlwind makes one called the AV Link, or something of the sort, which
will do exactly what you want.
--
---
My bands, CD projects, music, news, and pictures:
http://www.lateralforce.com
My blog, with commentary on a variety of things, including audio,
mixing, equipment, etc, is at:
http://audioandmore.wordpress.com
Staat heißt das kälteste aller kalten Ungeheuer. Kalt lügt es auch;
und diese Lüge kriecht aus seinem Munde: 'Ich, der Staat, bin das Volk.'
- [Friedrich Nietzsche]
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13 comments
8 participants
participants (8)
-
Al Thompson -
david -
Fons Adriaensen -
Gabriel Beddingfield -
Gabriel M. Beddingfield
-
Harry van Haaren -
Ralf Mardorf -
Simon Wise