נמר, Dan Wright ענה לי מהר וברור. להלן כל התכתובת שלנו, המתחילה עם מיילים לפי סדר כרונולוגי מלמטה למעלה.
אני מוכרח להודות שהפתיע אותי, ובניגוד למה שידעתי מהספרות על היכולות הפסיכו אקוסטיות של בני אדם, וגם הניסיון האישי שלי, לדבריו ככל הנראה אדם כן יכול להבחין במופע האבסולוטי של מקור קול. הוא גם טוען שישנם אנשים שרגישים לזה יותר, הוא מעיד על עצמו שהוא לא הכי רגיש אך יכול הבחין בהבדל מסוים. לפי דבריו ההבדלים המדווחים הם במיקום, בבמה, במרחב לא בתכונות אחרות של הצליל.
כמו כן מציין שהפיכת הקוטביות של הרמקולים, מתבקשת כדי לתקן את היפוך המופע המתבצע ע"י קדם המגבר שלו.
אני עדיין סקפטי שמישהו יכול באופן עקבי להבחין בין "נכון" ו"שגוי" של המופע אפילו במבחן השוואתי A B, אך איני יכול לבטל ולהתעלם מכל העדויות שהובאו כאן על ידך ואף על ידי היצרן של המכשיר. אני אנסה לבצע השוואות בעצמי, אנסה לשמוע את ההבדלים ואנסה לקבוע האזנה באודיופריק.
כאן אפסיק "ללכלך" את הפורום ואמשיך לעיסוקי האפורים.
אתה נמר, המשך את עבודת הקודש של סקירות, כתבות, ודברים שיביאו לנו כייף. תודה, וחג שמח שוב!
אריה
No problelm and you are very welcome.
Sincerely,
Dan W.
President, ModWright Instruments Inc (MWI)
www.modwright.com
1.360.247.6688
--- On Thu, 10/16/08, אריה קרפף <ariekarp@walla.com> wrote:
From: אריה קרפף <ariekarp@walla.com>
Subject: Re: Re: Question about SWL 9.0SE
To: "Dan Wright" <modwright@yahoo.com>
Date: Thursday, October 16, 2008, 2:44 PM
Dan, thank you for your prompt and comprehensive reply.
I guessed that your preamp does invert phase since it uses a single tube stage, and I speculated that the manual suggests to invert the speakers polarity to make sure that if it is used with multi channel surround systems it will be in phase with the other channels.
Beats me, I never ever was able to distinguish a "correct" or "wrong" phased system. I'm still skeptical about the claim that people are able to distinguish between "correct" and "wrong" phased systems, i.e. they can tell the absolute phase.
During the recording stage, post processing, and mastering the source material might be reversed, not to mention all the signal processing and "abuses" it goes through during the mixing, etc. How can you be sure that the source materials’ absolute phase is correct?
All this sounds to me as Mambo Jambo.
However you say that you do hear a spatial difference and that there are people who are very sensitive that can consistently pinpoint the "correct" phase. I can not dismiss this claim. I will try to audition your preamp at Audiofreak in Israel in order to try to experience this phenomenon. Hope they will allow me, in spite the fact that I am not a potential buyer, at least not at this moment.
Again, I appreciate your attention and effort to answer me.
Very best regards,
Arie
P.S. If you come across any reference to this psychoacoustic phenomenon of people being sensitive to absolute phase, I’ll appreciate if you could send me a link, or webpage, or whatever.
<modwright@yahoo.com>
Re: Question about SWL 9.0SE
Hi Arie, the preamp that was presumably reviewed or mentioned, the SWL 9.0SE does invert absolute phase. Some people at least CLAIM to be very sensitive to this and can detect it immediately. I have to admit that in all but our high-est end system, it is not something that I am all that in tune with. However, I do hear some difference and a number of my customers do claim to hear a difference.
Obviously one channel out of phase with another results in simple frequency cancellations, etc. is a known fact. That is obviously not what is being discussed here.
I can't say that I would dismiss it as absolute quackery as I have heard SOME differences myself. The differences I hear are spacial - i.e. depth of field, etc., not metallic or tonal differences so much.
The human ear is a VERY sensitive instrument and as man has 'evolved' over the years (an pardon me but I not a secularist), as hunters and gatherers, the human ear served to sense predators, etc. as part of self protection and phase relates directly to directionality and distance. As such, admittedly without scientific proof, I am inclined to believe that the human ear can detect differences in absolute phase.
I also freely admit that I personally am not as sensitive to it as others, but I have heard others prove it to me consistently.
I hope that this answers your question.
Sincerely,
Dan W.
President, ModWright Instruments Inc (MWI)
www.modwright.com
1.360.247.6688
--- On Thu, 10/16/08, אריה קרפף <ariekarp@walla.com> wrote:
From: אריה קרפף <ariekarp@walla.com>
Subject: Question about SWL 9.0SE
To:
modwright@yahoo.com
Date: Thursday, October 16, 2008, 6:27 AM
Dear Dan (or anyone of your team who will answer me),
Recently I read a review at DTOWN.CO.IL an Israely site which I guess will be "greek" for you:
http://www.dtown.co.il/index.php?news=562
where the reviewer states that your manual calls for reversing the polarity of the speakers when using your SWL 9.0SE preamp.
He states that it makes a big difference in the sound, and there is a significant impact on sound stage, details, dynamics, tonal balance, and reduced metalic character of the higher frequencies when speakers polarity is reversed. Being in the electrical engineering field, and as an audiophile myself, this statement bothers me as being out of the blue since it does not line up with what we knew until now about psychoacoustics, that absolute phase of a sound wave can not be evaluated by any human being (presumably animals too) and reversing phase of both stereo speakers will not make any difference in the perceived sound character.
Appreciate if you elaborate, and explain on this matter.
Very kind regards,
Arie Karpf (music lover)