Digest for sci.electronics.repair@googlegroups.com - 6 updates in 3 topics

"pfjw@aol.com" <peterwieck33@gmail.com>: Apr 17 12:55PM -0700

All:
 
Trolls get fat, happy and stupid by exploiting our inability to sit on our fingers as their bait floats across our screens. And, whereas it is entirely possible that some interesting sidebars may arise from troll-initiated discussions, it is NOT worth it. Really. IF you must participate in such a sidebar, start it as a separate subject on a new thread.
 
There is no training of trolls, there is no housebreaking of trolls, there is no shaming of trolls. No amount of vituperation or invective is capable of penetrating their hides - the only proper response is to ignore them entirely.
 
Please!
 
Peter Wieck
Melrose Park, PA
Rheilly Phoull <rheilly@bigslong.com>: Apr 18 09:28AM +0800


> Please!
 
> Peter Wieck
> Melrose Park, PA
 
+1
Mike S <mscir@yahoo.com>: Apr 17 05:49PM -0700

>> which are also scored, so I hope those are "good".
 
>> Mike.
> If the unit is still open, I would also replace those capacitors. Here in Silicon Valley, they are pretty cheap, probably less than the value of your time even at hobbyist rates.
 
Agreed, I would replace them. I just got a Samsung 22" monitor (free
from CL), the owner said she screen flickered badly until it 'warmed
up', taking about 30 min's, replacing these 3 caps fixed it.
 
https://imgur.com/19DOhw0
 
https://imgur.com/gbciD1H
Peeler <sociopath's@nightmare.invalid>: Apr 17 07:32PM +0200

On Tue, 17 Apr 2018 14:11:22 +0000 (UTC), Ragnusen Ultred, the notorious
troll-feeding idiot, driveled again:
 
>> unscrew the speaker from underneath.
 
> You have an intuitive mind.
 
> Every car is different.
 
<FLUSH all the drivel>
 
Geez ...another troll-feeding who likes to hear himself talking! <tsk>
jurb6006@gmail.com: Apr 17 12:36PM -0700

>"But shouldn't it be enough to notice? I've tried swapping the connections to a speaker before and there is precisely zero noticeable difference. "
 
Everyone's ears are different. I can usually tell immediately. It is much harder when the speakers are far apart, but if you put them right next to each other you should be able to hear the difference.
 
I have a DPDT switch wired for that, for reasons. Goes something like this :
 
==>:<== or ==:X:==
 
The "drawing" is not really working. The four connections on the outside are wired in an "X" configuration and a pair of wires goes to them, the other pair goes to the center connections. In and out are interchangeable. You are more likely to hear the difference with that because it is immediate, rather than turning it off, switching the connections and then back on.
 
With certain hearing deficiencies, not related to frequency necessarily and material that has little or no bass, it could be very hard to hear. A solo flute in stereo with ambiance for example, though a purist or audiophile might hear it, even I might not. It should be apparent on material with low bass though.
 
Even if you still can't hear it, take the switch and put two house speakers face to face at about a 45 degree angle, set the amp to mono and flip the switch back and forth. Even if you don't hear a difference in the sound there will be a marked difference in level.
 
It may not be apparent to some, but I can hear the difference in phasing between both fronts and both rears in a car. The switch idea came a long time ago and is useful for phasing a quad system with different type speakers in front than in back.
 
I know someone who was running a stacked system, two pairs of floor speakers. One set had its back to an open doorway and staircase, the other was more toward a corner. The latter sounded boomy so he put the bottom speaker on that side out of phase which smoothed the bass response.
 
Polk used out of phase midranges in one series of their speakers. There was a cable cross connecting them which fed the right side with an inverse signal to one of the midranges on the left and vice versa. This was to enhance separation/imaging. The idea was to cancel the midrange bouncing around in the room or something like that. Never heard a pair of that series but they got good reviews.
jurb6006@gmail.com: Apr 17 12:42PM -0700

Also, one very high end speaker manufacturer (Quad maybe ?) tested each of the speakers of one model freshly built by putting it next to a reference speaker and feeding them the same (IIRC) 1,000 Hz square wave out of phase. A mike was placed exactly in between the two and was expect to have zero output. If it nulled the speaker was perfect, if not it was a reject.
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