Phase inverting pre-amp
heiney9
Posts: 25,165
My new pre amp is phase inverting and I have SDA's. Do I need to swap the pos and neg speaker terminals? I can't remember the proper procedure.
Thanks
H9
Thanks
H9
"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
Post edited by heiney9 on
Comments
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Yes swap the phase on the speakers.However the audibility of absolute phase is debatable.
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Thanks Fred, I was more concerned with the SDA's and making sure they are getting the proper signal to function properly.
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
Oh missed your running SDA's part.In that case I would'nt reverse them unless you have one of the isolation transformers.
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My linestage also reverses phase. Best suggestion is to try it both ways to hear which sounds best. IIRC I reversed mine at the speaker and the imaging/clarity/tone was audibly better. I am running a dreadnought, though I wired them the same before the dreadnought without issue."Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills/jantzen inductors, Gimpod's boards, Lg Solen SDA inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR BP's, upgraded IC Cable, Black Hole Damping Sheet strips, interior of cabinets sealed with Loctite Power Grab, AI-1 interface with 1000VA A-L transformer
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This came up the other day prefixed with Running Cary pre by kroc321.
http://www.polkaudio.com/forums/showthread.php?155589-Running-Cary-Pre-with-inverted-ouptut-with-SDA-CRS&highlight=phase+pre+amp
My ModWright pre inverted phase and I couldn't tell a difference reversing speaker cables on my ESL's.Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ * Signature Series Sonore Music Server w/Deux PS * Roon * Gustard R26 DAC / Singxer SU-6 DDC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 * -
For most people, absolute phase doesn't make a difference. My rogue 66 with just unbalanced connections inverted phase and I flipped the pos and neg and didn't hear a difference, but YMMV.2Ch Tube Audio Convert
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The ps audio perfectwave lets you invert the phase if your in the market for one
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For most people, absolute phase doesn't make a difference. My rogue 66 with just unbalanced connections inverted phase and I flipped the pos and neg and didn't hear a difference, but YMMV.
The big caution is with SDA speakers, that flipping the speaker outputs can damage the speakers and/or the amp. -
Yes with common ground.An exception would be if using one of the purpose built isolation transformers and a non common ground amp.Polarity could then be swapped with out issue.The big caution is with SDA speakers, that flipping the speaker outputs can damage the speakers and/or the amp.
As for preserving absolute polarity I have never found it to be a significant factor. -
the audibility of absolute phase is debatable.
It's because you don't use the In-phase transformers. :P
Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin: -
Ahhh thats it,the old "INPHASE" transformer trick.
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So if your out of phase, just go to the darn store and get some.....
Did you hear the one about the two out of phase sound waves of equal amplitude that walk into a bar at the same time?Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ * Signature Series Sonore Music Server w/Deux PS * Roon * Gustard R26 DAC / Singxer SU-6 DDC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 * -
The store?Don't they sell it in little baggies on the street corner?
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Lol,and let me guess they knocked each other out.SCompRacer wrote: »did you hear the one about the two out of phase sound waves of equal amplitude that walk into a bar at the same time? -
I've get her hooked up and am tube rolling and it sounds fantastic as is so I won't be futzing with the speaker polarity.
Good one Rich and Fred
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
Enjoy.I've get her hooked up and am tube rolling and it sounds fantastic as is so I won't be futzing with the speaker polarity. -
Ahhh thats it,the old "INPHASE" transformer trick.
I don't know if anyone ever attempted the OUTPHASE transformer trick though.SCompRacer wrote: »So if your out of phase, just go to the darn store and get some.....
Did you hear the one about the two out of phase sound waves of equal amplitude that walk into a bar at the same time?
I usually look for someone about my size before I rip a loud one in the store. I always hope he may also rip one about the same loudness at the same time to cancel out all the noises so no one would go noticed what just happened.The store?Don't they sell it in little baggies on the street corner?
All this Phase talk makes me a bit uncomfortable now. I hope Mike didn't read this thread. lolTrying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin:
