2. amps-preamps
  3. 151613-2029

Correct Way to Invert Phase

Hi,

My Conrad Johnson preamp is phase inverting.

The CJ manual says to change the phase "...by reversing the positive and negative connections to your speakers (be sure to reverse both channels)..."

Can anyone explain why changing the positive and negative connections between the amp and preamp would not accomplish the same thing?

Just wondering if this could harm the components or is some other science at work here that I do not understand?

Thanks for listening,

Dsper
dsper
larryi
4,100 posts
 
Just speculation on my part, but, I bet speakers with drivers that are time aligned on their baffle and have crossovers that also do not shift phase (1st order crossovers) might make it easier to discern changes in polarity.  Of course that would be the case too with full-range drivers, including electrostatics.  
moendrums
2 posts
 
I have a similar problem but the issue is with my sub. It doesn’t have a polarity switch for some reason. I’m using a heavy duty RCA cable to its input from the subwoofer out on my amp. I’m assuming you’d need a box of some sort to invert the phase since RCA isn’t TRS? I used to make my own “phase reverse” TRS cables back in the day when I had a lot more time and patience😂 Any wisdom on the issue would be much appreciated
erik_squires
16,380 posts
 
With RCA you can use an isolation transformer and reverse the outputs, since the outputs of the transformer will be balanced.
imhififan's avatar
imhififan
2,212 posts
 
Subwoofer Phase Controller
https://sound-au.com/project103.htm

rpnz's avatar
rpnz
28 posts
 

I have a phase inverting Cary 98P. I correct this at the speaker terminals.
I also have a Feliks Euphoria head phone amp the is fed from the amplifiers second set of amplifier outputs to the Feliks amps inputs, how can I phase invert this?

Could I swap the + & - soldered connections on one end of the each L &R RCA cable or swap and resolver the output wires inside the amp leading to the rca connections? (This looks like it is easy) ? 

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