2. amps-preamps
  3. 1414403520

Long cable run from my phono preamp to linestage.

Due to constraints of a small 11 x 12 ft listening room and the difficulty accessing my turntable within a vertical rack, I've decided to place my turntable on a small table next to my listening chair. As this setup requires a 4 meter cable run between my turntable and full function preamplifier, I've decided to use a small stand alone phono preamplifier with 68db gain (MC) to sit next to my turntable. I am not terribly experienced with analog. Is it ok to use a 4 meter cable run between phono preamp and linestage? I'm sure it's better than sending an unamplified MC signal over 4 meters of cable to my full function preamplifier. Please note I do not have sufficient room to place my full function pre or my entire rack near the listening chair. Thanks for your opinions. Perhaps I'm overthinking this :))
audiobrian
audiobrian OP
184 posts
 
Sorry for my extended absence....family concerns I'm afraid.
Thanks to all who responded.
I am using a Thor TA 3000 mk2 phono pre with output impedance of 300 ohms. It has 67 db MC gain, running 4 meters Cabledyne Silver Reference
Unbalanced ICs into my VAC Ren Sig II linestage, driving VAC phi 300.1.
I'm still considering placing my entire vertical rack to the right of my listening chair, allowing me to use the 4 meter run between linestage and amplifier as most do.
Happy holidays!
georgehifi's avatar
georgehifi
10,312 posts
 
Hi Audiobrian,

I looked up the capacitance of your Cabledyne Silver Reference. The 4 mts of it will yield 160pf for each channel. This combined with the 300ohms output impedance of your phono pre will give you a -3db at 3.3ghz!! Which is no trouble at all, bats wouldn't even hear this hf roll off.

If you use the same interconnect between your VAC pre (which is half that of the of the phono pre at 143ohms) and your poweramp it is even better at -3db at 6.8ghz!!!

So the end result is you can use it either way, go with what sounds best and convenient to you, as either way you are not causing any roll off into the audio bands high frequency.

Cheers George
almarg's avatar
Ag insider logo xs@2x
almarg
9,670 posts
 
I agree with George's comments, except I think that when he typed "ghz" (gigaHertz) he meant to say "mhz" (megaHertz).

Regards,
-- Al
georgehifi's avatar
georgehifi
10,312 posts
 
yep, sorry "MHz" speed always gets the better of me

Cheers George
audiobrian OP
184 posts
 
Thank you for your calculations and practical info George!
I will now go with convenience, knowing there is no sonic price to pay either way:))
Much appreciated!
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