DIY Audio Projects Forum

Phono Preamp Wiring
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Author:  Vili [ 11 Apr 2020, 22:44 ]
Post subject:  Phono Preamp Wiring

Still learning, but had a general question hopefully the forum could answer.
I'm wondering about preamp and wiring to a receiver roughly 35ft away.
Some background:
I've been looking for a project to learn more about electrical engineering and circuit design.
Ended up finding a kit for a preamp to replace the LP-120's built in preamp (more for fun than sound quality).
From the output stage of the preamp, I'd have to run the wire through my walls and down to my home receiver. (S.O. only wants one 'set' of speakers/amp in the room)
Doing some research, I've hit a snag as to what would it be best to run from component to component, balanced or unbalanced lines for best audio quality.

Which setup the forum recommend, and how would that look in application?

Additional info:
The preamp kit in question only provides RCA in/out and a ground lug.
External noise in my area is noticeable.

Thanks in advance guys, ya'll have been excellent resources in the past!

Author:  ILoveHiFi [ 15 Apr 2020, 05:54 ]
Post subject:  Re: Phono Preamp Wiring

Because you only have the RCA then it will no accept fully balanced.
You need the high qulity coax cable and if you can, try to match the line impedance when your running long distances.
10M 35ft isn't very long, any coax should work fine without much additonal noise.

Author:  gofar99 [ 15 Apr 2020, 20:51 ]
Post subject:  Re: Phono Preamp Wiring

Hi, As long as the preamp has an output impedance that is significantly lower than the input impedance of what it is feeding then it is OK. A ratio between 1 to 5 and 1 to 10 is generally accepted correct. I use "instrument" cable, mostly Belden and Mogami for cables. Several in my system are in the 20 foot range and cause no issues. The biggest issue is loss of high frequency content because of cable capacitance. The more cable the more capacitance. Low impedance sources (like many phono preamps) mitigate this to a large degree. You didn't specify what preamp you got so I really can't be positive and say there will not be some losses. I run ratios about 1 to 25 in my system between the phono preamps and line stage and 1 to 5 between the line stage and power amps.

Good listening

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