Changing Turntable to Balanced Output

@atmasphere 

The input used an input transformer as well. This allowed the tape machine to have microphones a good 150 feet from the machine with no degradation of the mic signal. 

Do you really believe this. My understanding is that any low signal level cable over 3 metres no matter how whoopdido is going to have high frequency roll off. And what about phase shifts and internal reflections within the cable itself.

I find it hard to believe there is no degradation.

@atmasphere 

I've run similar lengths for microphone signals myself- with no rolloff. Its helpful to keep in mind that a properly set up balanced line system is also low impedance (600 Ohms is typical) and the low impedance aspect allows you to run longer connections.

I get the low impedance argument, but I still can't believe there is no signal degradation with a pair of 150ft interconnects and no phase distortion across the frequency spectrum. I would agree that in a properly designed balanced system cables are less susceptible to noise intrusion and have less effect than in a single ended system.

Have you measured frequency response and phase accuracy ( across the full frequency range ) in these situations ??