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Interconnect cable through wall cavity


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Hi I am looking at putting a 10metre length of interconnects through a wall cavity for a turntable setup... Just wondering if rca's would do the job or should I look at balanced cables setup??

 

Cheers in advance for any advice

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At this stage is an entirely new setup so could be either, as will be purchasing amplification and speakers for a living room setup.... so could either have turntable and phono stage in the one spot with the 10 metre connection from phono through cavities to where amplification will be .... or alternatively have a 10 metre connection straight from turntable through cavities to amplification with inbuilt phono stage...

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so could either have:

  • turntable and phono stage in the one spot with the 10 metre connection from phono through cavities to where amplification will be .... or
  • alternatively have a 10 metre connection straight from turntable through cavities to amplification with inbuilt phono stage.

 

Not the latter.  The signal is so small from the cart - even an MM - that it will be seriously degraded by having to travel through 10m of cable before it gets to a phono stage.

 

Whereas the output of a phono stage should be at least at 250mV (even with a LOMC) ... which should survive a 10m journey intact, providing:

  • you use some low R, low C interconnect cable, and
  • the Zin of your preamp is at least 200 times the Zout of your phono stage.

Regards,

 

Andy

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Thanks Andy,

 

So will definitely have a phonostage with the turntable and interconnect from the phonostage to preamplifier... in this scenario does it matter if its balanced or rca for the 10metre journey?? as anecdotally have always been told balanced cables should be chosen when looking at longer lengths of connection?

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Thanks Andy,

 

So will definitely have a phonostage with the turntable and interconnect from the phonostage to preamplifier... in this scenario does it matter if its balanced or rca for the 10metre journey?? as anecdotally have always been told balanced cables should be chosen when looking at longer lengths of connection?

 

My take on this is as follows:

  • Balanced is absoloootely needed in pro environments where, typically, cables are very long and there's lots of them around - including power cables.
  • A domestic environment typically doesn't have ICs of 10m length ... but I've been able to prove to everyone who's visited over the last 15 years that 11m of shielded RCA cable is fine - assuming the provisos I mentioned above.
  • So you don't have to choose a phono stage which has balanced outputs, for your setup.
  • There's nothing intrinsically wrong with having balanced outputs on any piece of domestic gear ... except that, typically, this requires a more complex circuit than unbalanced - and complexity generally degrades the sound (compared to the simpler alternative).

EDIT: Not all phono stages will have enough drive to deliver the signal over 10m of cable.  Can you audition a few before buying one?

 

Regards,

 

Andy

Edited by andyr
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Hmm well I've put a 50x25mm conduit down the wall which will have 2 HDMI cables, 1 Ethernet, 1 fox coax and 1 regular antennae cable plus the interconnects so there may be a bit of interference?

 

Should be OK if they are shielded.

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Hmm well I've put a 50 x 25mm conduit down the wall which will have 2 HDMI cables, 1 Ethernet, 1 fox coax and 1 regular antennae cable plus the interconnects - so there may be a bit of interference?

 

I, personally, would not just use 1 conduit.  Use the 25mm conduit for 5 wires - 2 x HDMI cables, 1 x Ethernet, 1 x Foxtel coax and 1 x regular antenna cable - but I would suggest you add a second, 25 or 18mm conduit for the 2 x ICs (1 for L, 1 for R).  IOW, separate analogue from digital. :)  It costs nothing to do this when you're building ... it's impossible to do it later, if you find you are getting interference!

 

 

Regards,

 

Andy

Edited by andyr
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Thanks for the info unfortunately am not building am renovating, have angle grinded and jackhammered this into a brick wall has taken me half the day :D .. so would rather not have to do that again if at all possible

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Hmm sounds like a party going on in that conduit! If you only get one shot at it (i.e. if it's too much hassle to pull in and out to trial) then I'd get myself some Techflex Conductive and wrap your analog interconnects in that as a further level of shielding. It's not cheap but may pay off. 

 

Thinking about this again, maybe you should wrap the other cables in the Techflex and leave the analogs....

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