Preamp inverts phase question:


The owners manual of my preamp indicates that the preamp inverts phase: the circuit is phase inverting. Does this mean that I need to hook my speaker cables up backwards to correct the phase inversion... do I hook the positive speaker cable to the negative speaker binding post and visa versa with the negative speaker cable connections on both speakers?
adampeter

Showing 6 responses by benie

Most think that inverted and non inverted options on preamp is for switching back and forth for certain recording, although one can do this and it can have an affect, this is not the true nature of what it is for.

It is about matching components!
If your preamp is inverted then you should be (in a perfect world) using an amp that is non inverted.
Like wise if your using a preamp that is non inverted, then you want an amp the is inverted.

When there is a mismatch that is when reversing the speaker wires will solve the problem.

On some systems it will be noticeable on others, not so much. I have found when setup properly it can affect sound stage and bass, listen to female vocals will have more depth as well.
"[If my preamp inverts and my amp is non inverted then there is no need to correct the phase is that correct?]"

Yes that is correct!

Whether you hear a difference or not. This is the correct way.

Dopogue wrote "( although I have discs where I can pop the vocalist out front with one polarity setting and push him back into the mix with the other)."

It sounds like your system is very revealing and you have ears that can hear it.
Some systems are not and some ears can't.
As I said, one can hear a difference on some recordings, but that is not the primary purpose.

From a technical design stand point having the components properly setup with either Non inverted and inverted or inverted and Non inverted, is the primary affect. The phase of the recording is secondary.

Some designers agree with this, there may be some that don't, who knows. But what ever way works for you, go with that.
I'm not a tech, are you?
But I have had it explained to me by a very highly skilled Designer and I don't mean someone into DIY.

As far as a article about: Google is your friend!

Can you kindly offer either a technical explanation saying how I might be incorrect, or a link that would provide one?
I am not talking about, Recording or Speakers!!!

Thanks.
:-) lol Jmcgrogan2 wrote "One more option could be an inverted source. An inverted source with an inverted preamp and a non-inverting amp would also produce absolute phase.

To make it simple, think of absolute phase as a '+' and inverted phase as a '-' . 2 X '-' = '+' , 1 or 3 X '-' = '-' .
You can simply change the '-' to a '+' by switching + and - on your amp terminals, no big deal."

Thank you very much for taking the time to explain it instead of just saying it. Very well put in easy to understand terms.
This explains why I am correct for my system and not for others. There must be many others that have sources that are inverted and then throw in phono pre's and DACs on top of that as well.

I could not change the speaker cables on my speakers. I run Acoustat's with the Direct Drive Tube Amps so I had to get a switch put in a preamp to be able to switch in between inverted and non inverted.

This is an area where an Electrical engineer would be more versed as there are absolutes.
Sorry to say it but I just don't hold Electrical engineer to the same standard as I once did or some so called online Electrical engineers . I just seen to many of them
saying certain things are impossible when it comes to cables and such. For me it ruins some of the credibility because I hear a difference!

Maybe I was confused when the Designer explained it to me as it may have been just to my system he was talking about.

But as to my other points as to how it affects the sonics and sound stage, I can hear it.

I believe I am I still correct in believing that a designers primary function when designing with inverted + non inverted components is the objective for the components to match, so one can achieve absolute phase.

Dopogue: I get the point about recording, but we can't do anything about what's already done, so why worry.
We can control the way are gear is hooked up though, that's the point and what the OP was asking about.
Rodman thanks for the links.

I also have the 'Chesky Jazz Sampler and Audiophile Test Compact Disc Vol 1'(JD37).
Great test CD for testing phase, the imaging test is very good as well, when the imaging test goes off stage far left or right, my imaging goes right to the side walls trying to bust it down.
I have used this test on a few other systems and when the imaging test goes off stage far left or right, the other systems almost go back to center or in that direction, don't know what up with that.

I just happy mine does what it should.