I don't want to speak regarding audibility of absolute phase, because I do, and I proved to myself with blind test.
But my system inverts somewhere: i have a CD track test with 3 positive 80Hz pulse followed by a negative one, and only if I invert the cables I have the speaker moving 3 times forward and one time backward (and this is my preferring way to listen too).
Well, I have the schematic and opened all my audio chain: the speaker doesn't invert; the amplifier doesn't invert; the two-opamp 4 pole filter inside the CD player after PCM1710 DAC do not invert.
I don't think it is my computer where I have masterized the CD test: if I open the CD-track with an audio software I really see 3 peaks up and 1 peak down.
So it is anything between the laser detection and the ouput of PCM1710 DAC.
Do you have an idea where it could invert the phase and if it is visible in the schematic??
My CD is C525BEE but schematic should be identical to this:http://hifigoteborg.se/nad_manuals_self/C521BEE.pdf
Attached my audio chain, which DOES NOT INVERT THE PHASE (unless the change I deliberately did at louspeaker to maintain absolute phase)
But my system inverts somewhere: i have a CD track test with 3 positive 80Hz pulse followed by a negative one, and only if I invert the cables I have the speaker moving 3 times forward and one time backward (and this is my preferring way to listen too).
Well, I have the schematic and opened all my audio chain: the speaker doesn't invert; the amplifier doesn't invert; the two-opamp 4 pole filter inside the CD player after PCM1710 DAC do not invert.
I don't think it is my computer where I have masterized the CD test: if I open the CD-track with an audio software I really see 3 peaks up and 1 peak down.
So it is anything between the laser detection and the ouput of PCM1710 DAC.
Do you have an idea where it could invert the phase and if it is visible in the schematic??
My CD is C525BEE but schematic should be identical to this:http://hifigoteborg.se/nad_manuals_self/C521BEE.pdf
Attached my audio chain, which DOES NOT INVERT THE PHASE (unless the change I deliberately did at louspeaker to maintain absolute phase)
Attachments
No.
The speaker itself is moving correctly in phase with its input jack, just used a 1.5 V battery, plus with red, minus with black, and it moves upward.
It must be something inverting before the 4 pole filter inside the CDplayer.
All the following chain is in absolute phase.
People pay too much attention to absolute phase in their systems. I am not saying that it cannot be heard, but that since the absolute phase will vary from recording to recording (and many will have a miss-mash) it will never be right allt he time. So if you play one song the phase may be correct, but the next could be the opposite.
If it concerns you you will need an absolute phase switch somewhere in your system and you should go thru your music collection and mark each as to its phase.
dave
If it concerns you you will need an absolute phase switch somewhere in your system and you should go thru your music collection and mark each as to its phase.
dave
Exactly how are you using that test signal to determine the absolute phasing of your system chain? Are you using an o-scope on the signal path? Is the phase inverted at the PCM1710 output pins?
Unfortunately I use only my fingers on the speaker. And it goes backwards with a positive to plus 1.5V battery from amplifier's RCA too.
Also the schematic shows that my tube amp is not inverting..
So should be only the CD player, but the 4 pole filters are not inverting. So it is something behind... Thus I can say that the phase is inverted at the PCM1710 output pins.
How do you know for certain that your test signal is being inverted at all? Are you saying that you are simply feeling the speaker cone with your fingers as you play the test signal to determine the phase inversion?
Your test seems simple and straight forward. The only thing I can say is that sometimes I have trouble sensing cone movement direction by hand - on quick impulses. Can you use some other method to check?
I don't know why your DAC would invert, but without an oscilloscope it may be hard to tell. Can you find or borrow another playback device to see how it behaves?
I don't know why your DAC would invert, but without an oscilloscope it may be hard to tell. Can you find or borrow another playback device to see how it behaves?
Maybe it's my interpretation of what you wrote above, but I think the speaker membrane should go "out" when you connect the battery; plus to plus and minus to minus....
Nick
That is the convention but it isnot a standard. There are speakers that go the other way positive to red.
dave
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