Hello all. Falling back to low-tech solution.

Use a wire table and an assumed speaker impedance (say 4 ohms). When the length of the wire causes an impedance equal to the speaker ... then you have only half of the audio voltage at the speaker and that's -6 dB. -6 dB is very noticeable, by the way. -1 dB is just noticeable.

the cost of "RCA cable" (sheilded audio cable)

30 metres should work fine. 300 if you stay away from power runs. 3000 would work, but you'd save money by using twited pair and a balun each end.

(even with shorter runs) ground loops may be a problem, (an audio isolating transformer can help) radio interferance is another ptential problem (ferrite cores each end can help with that)

Bye. Jasen

--
Depends on what you're willing to settle for at the far end.

thanks, all for the feedback. Went low tech, 36' of sheilded wire with RCA ends from RadioShack. Sprung for a 24bit sound card. WOW! regards, ben

Aren't the RCA outputs usually the line level output? Speaker output generally a 3.5mm socket?

David

Charles Schuler wrote:

Sound card output is fed, in this case, into the AUX jacks in the back of a DYNACO tube pre-amp. ben