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I'd like to know which of the proposed solutions is best to connect mixer-amp-speakers .... for a 50 meters distance ?
1) Mixer-Amplifiers -> 50 meter-cable -> passive speakers
2) Mixer -> 50 meter-cable -> amplifiers-passive speakers
In the last case (option 2) ... is an AIKIDO preamp-stage enough to drive the 50 mt-cable?
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Number 2 is technically the best.
However, if this isn't for critical listening, Number One may be the best for practical reasons. At worst, you lose a bit of power and a lot of damping due to speaker cable resistance, but chances are that'll be relatively inaudible.
The "correct" way has a few more gotchas. Long line-level cable runs may cause instability in the mixer output if it's not designed to drive high-capacitance loads. Locating remote amps where they won't be covered in spilled drinks or smothered by coats can be an issue. Running the amp(s) and mixer from different electrical outlets can lead to ground loop problems in venues with sketchy wiring.
Check with Akido. If it has a low-impedance cathode-follower output, then it *might* be able to drive long leads. BLZeebub is right about the balanced lines -- it's really hard to make up single-ended lines that are sufficiently shielded for such long runs. You *could* try making up single-ended cables with stainless-steel mesh tubing outside that is connected to ground at the amp end, but I can't guarantee that would work. What I *am* sure of is that running long speaker cables after the amps is not a good way to go.
WW
There is NO substitute for the live performance.
Not familiar with Aikido pre amps but if you use balanced (xlr) lines option 2, if you don't then just don't do it at all IMO.
Many thanks for your reply.
Aikido preamps (http://www.tubecad.com/Nine-Pin_Aikido_PCB.pdf) are, usually, SRPP stages with signal output not balanced.
Do you think that a solution as that proposed by Bill could work properly?
I would like to avoid a further stage only to transform the signal into a balanced one.
I think that with 50m between source and speakers balanced lines are the only sensible option short of redesigning the entire system (and every piece of equipment within it) from voltage transfer to current transfer principles with the precise impedance matching necessary for that to work correctly.
Balanced lines also run just under 12dB hotter which helps.
What do you mean with "...from voltage transfer to current transfer principles" ?
That's how the old valve-powered telephone exchanges and trans-atlantic telegraph lines were designed. You'd need a lot of expensive transformers and every input and output has to terminated to exactly 600Ohm.
It is not a feasible option, I was being facetious.
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