October 9, 2020 at 5:16 pm #562
The plugging/unplugging topic has been beaten to death on pg. 1 and in a number previous posts for that matter.
The bias circuit has been generally reliable over the years, panel issues are another story, at least for some pre PX panels, also mentioned on pg. 1.
October 9, 2020 at 4:46 pm #561kingdeezieParticipant
There is a lot of talk about panel longevity.
What is best for the plate longevity?
How reliable is the bias circuit? Some of the older units had problems I’ve heard.
Is longevity increased by leaving them on constantly, or only when using them?
How detrimental is plugging them and unplugging them?
October 9, 2020 at 4:41 pm #560
At the end of the day do what makes you feel comfortable, you wanna leave them powered 24/7, do it. You feel more comfortable unplugging/ turning them off when not in use, do it.
The one instance when I would certainly unplug them is when severe weather (lighting) is forecast/imminent.
BTW, TWB’s comments about pre and post PX panels are accurate, had my share of factory returns due to pre PX panel failures.
Now, let me go turn my panels on and listen to some music.;))
October 9, 2020 at 3:09 pm #559TWBModerator
It also needs to be pointed out that prior to the PX generation of panels, there was a serious problem with the insulation of the stator wires, and a different coating of the mylar. Arcing and burn thru happened all to often, necessitating a trip to the factory. With the PX gratin and beyond, all this is history and problems are rare.
October 9, 2020 at 2:45 pm #558atedeschiParticipant
Having owned A1s since 1980 (I think I probably had the first production pair) the accumulative plugged in time is something on the order of 40 years with no hv supply problems. Of course you can always do what you want.
October 9, 2020 at 2:41 pm #557
Well…. I used to have SL A-4 , if anyone knows about them , very old model, beautifully sounding – many moons ago… I kept them on all the time back in days… Once I went for vacation and when I came back humidity in room changed a lot. Crackling was so loud and terrible … Very soon I had to change panels. You do whatever you want guys – it is your money! I dearly like Dr West but with some suggestions I do not agree.
October 9, 2020 at 2:16 pm #556
I completely concur TWB. Indeed, via my previous communications with Dr. West he explicitly advised as you said, that there is NO reason to cut the power to the speakers. If there were a reason to do so, I’m positive that Dr. West would have installed automatic shut-offs as my Martin Logan’s have.
Having owned M1’s, M1PX’s and now Majestic 845’s, I’m on my 3rd. pair due to upgrades and I have left them all powered-on 24/7. My only reason in contemplating otherwise, was due to my “Audioneurosis” — aka
October 9, 2020 at 2:07 pm #555
My advice to new owners: there is NO reason to keep SL plug in all the time – eventually if you want to short life of your bias power supply and panels!
October 9, 2020 at 1:57 pm #554TWBModerator
To forestall the possibility of any new owners getting the false impression there is a need or reason to be turning the power to the backplates off in-between use, Dr. West has spoken clearly: there is not! I have owned various Sound Lab models over the last 20 years. Other than a few occasions when I planned to be away for an extended time, I have never unplugged them, and see no reason to do so.
October 9, 2020 at 1:03 pm #553
Check the older threads, another member uses wireless lamp switches, RF not Wifi, to turn his Majestics On/Off.
Might be easier than bending over to flip the switch.
October 9, 2020 at 12:52 pm #552
“John V”, Thanks for the “male-female extension with inline switch” Amazon link. Did you do a test to see if the in-line switch made any noticeable differences?
Having spine and hip issues, bending over to plug/unplug etc., is very difficult. Hence, my thought of using a WiFi plug. However, doing so may be of no value. Because as some here have stated (including Dr. West), there is no downside to leaving the speakers plugged-in 24/7. But, if I’m NOT going to use the speakers for an extended period, I often felt that they should be de-powered – with “felt” being the key word.
“D10”, logically, I agree that heavy gauge (&/or audiophile) power cables shouldn’t make a difference with SL’s. In fact, Dr. West has said the same from a pure power requirement perspective, as you suggested. However, the miles of power lines, transformers before the line into the house is oftentimes used to site “non-sense” for utilizing a special ~6-foot cable from the wall to equipment, or using special mains receptacles. Which is similar to the bits-is-bits argument when it comes to USB cables, Ethernet cables and all other hardware in the streaming/computer audio chain – i.e. they shouldn’t make a difference, as long as bits-are-bits. But I’ve found that they, power cables, receptacles, dedicated lines do make differences. Are the differences sufficient to spend $100’s or $1,000’s of dollars, well therein lies the dilemma and question?
Line noise is a different matter than current carrying. As I initially mentioned, some Soundlab owners have posited that cables can modify line noise (into and out-of the speakers) and improve sonics. Some cable manufactures specifically design cables for digital and other sensitive equipment for that purpose. Whether they work and would do anything to improve Soundlabs is the question for which I would love to have others experience and input. Especially as I mentioned in my case, auditioning items like power cords — where bending is involved — is very difficult and painful.
October 9, 2020 at 10:51 am #551
I also unplug my U890’s when not in use. I have a short male-female extension with inline switch (https://www.amazon.com/gp/product/B01HGNN30M/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1).
As D10 mentioned above, the panels bias up in seconds as per Roger West.
October 9, 2020 at 10:38 am #550
I always unplug SL when not listening. They like heavy gauge power cables which is non-sense since required power for bias is very low. The membranes are stabilized within seconds when you plug it in.
October 9, 2020 at 10:14 am #549kilkilParticipant
I have more experience with unplugging Quad 2905. When i moved these to my office system (which is when i bought my Soundlabs-Prostat 922), i put them on the switched power that the rest of the office was on. and it took ~30 mins for quality and volume to return to the Quads. Now i have them plugged into the UPS, so that power is never off.
The Soundlabs have only been unplugged in transporting them to my house, when i first plugged them in, no sound from one speaker and barely any volume from the other. then i paused the music and after about 20 mins i tried again and they seemed almost normal, but volume was un-even between the two speakers. later that evening i did more serious listening and the volume was fixed.
October 9, 2020 at 9:45 am #548
The system had been played for a couple hours before unplugging each speaker to install the plugs. Each speaker couldn’t have been de-powered for more 45 seconds to a minute. However, perhaps that was sufficient to do as you advised, initiate the: “30-60 minutes to stabilize the electrical field after being plugged in”.
October 9, 2020 at 6:15 am #547kilkilParticipant
I don’t think it is the WIFI plugs themselves that reduced the volume, but that it takes 30-60 minutes to stabliize the electrical field after being plugged in. IMO, there is no reason to unplug the speakers, unless you aren’t going to use them for more than a month.
October 8, 2020 at 1:35 pm #544
As an experiment, I tried using Amazon WiFi plugs with my Majestic 845’s. Although Dr. West has said that de-powering the speakers isn’t required or necessary. I thought that I may try doing so with the WiFi plugs.
My experiment was halted almost as quick as it started. Decibel level dropped significantly. Although not measured, my sense was that level decreased by 30-50%! At that point, a longer listening period to access sonics, wasn’t considered. If the plugs effect SPL to that level, burning them in or otherwise, isn’t worth my time and effort.
I’ve never tried audiophile power cables for my speakers. But I know others have. Although the Amazon plugs contain circuitry any of which could impeded power and add noise, this little experiment perhaps suggests that power cables may make a difference. Some have posited that cables may decrease line noise and hence, the positive difference. Have you performed any cable auditions and if so what were your findings and cable preferences?
Additionally, I wonder if anyone has found a successful, non-invasive/intrusive way to switch on/off the Soundlab, other than plugging/unplugging them?
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