This Device is phase-inverting

[andyrlb]

What actions do I need to take with this preamp? Should I swap cables around?
And I take it that RIAA stands for turntable?





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[anthonyTD]

Hi,Andrew,
Its nothing to do with cables, it means that the signal going into the input is inverted somewhere in the circuit, hence the output signal is inverted, compared to the input, hope this helps.
And yes, RIAA refers to the phono input.

[dave2010]

Really depends if you think you can detect the phase inversion, which I'd suggest that you probably can't. If it bothers you, you can put another phase inversion in - I think fairly simply if you connect to another unit, or to loudspeakers. If it's functioning as a pre-amp you just need cables with the signal wires swapped over. Otherwise just let the signal propagate through your replay chain, then swap the loudspeaker cables over - i.e. if you have a left speaker with (say) a red plug, and a blackplug - just swap those over - similarly for the right speaker. If it makes any difference at all, it would be at the start of a transient, such as a hard drum thwack.

I doubt that you'll notice a difference, but if you convince yourself you will, then you probably will!

[andyrlb]

Nop I hear nothing but beautiful sounds


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[Barry]

The preamp inverts the phase, that is: a positive-going input signal results in a negative-going signal at the output. If the power amplifier is also phase inverting then overall there will be no change. But if your power amplifier is not phase inverting, then all you need to do is invert the speaker cables: that is plug the red lead into the black socket on the amplifier output, and vice versa. Do this for both channels.

The American audiophiles seem to be far more concerned about phase inversion than others. A good while ago I spent some time experimenting with this (my preamp has a phase switch, so I can invert the phase at will), and found I could not hear any difference. However others may find they can hear a difference.

[Firebottle]

If it's functioning as a pre-amp you just need cables with the signal wires swapped over.

NO NO NO>

It's an unbalanced signal, otherwise known as single ended, If you swap the signal wires you connect the screen to the 'hot'.

Swapping the speaker wires over is different and perfectly OK.

[andyrlb]

NO NO NO>

It's an unbalanced signal, otherwise known as single ended, If you swap the signal wires you connect the screen to the 'hot'.

Swapping the speaker wires over is different and perfectly OK.

So I still connect my red and black speaker cables to the red and black speaker outs on the monoblocks ( your monoblocks) ?


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[Barry]

So I still connect my red and black speaker cables to the red and black speaker outs on the monoblocks ( your monoblocks) ?

Yes - red plug of the speaker cable to the black socket on the power amp, and black plug of the speaker cable to the red socket. Do this for both speaker cables.

[andyrlb]

I’ll try it now


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[andyrlb]

Nop I can’t hear any difference


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