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Shielding on JBL S-CenterII


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7 replies to this topic

#1 of 8 OFFLINE   Mark Hedges

Mark Hedges

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Posted April 23 2003 - 12:35 AM

I was wondering if anybody else has had a problem with the magnetic shielding on their JBL S-Center II speaker. I just got a Sony Wega 32HS500 HDTV and when I put the speaker on top the very top center part of the picture is discolored purple. When I lift the speaker off the TV the discoloration goes away.

Is there anything that can be done to improve the shielding? Will this cause any actual damage to my set, or will it just be an annoyance factor?

Thanks!

Mark

#2 of 8 OFFLINE   Myo K

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Posted April 23 2003 - 04:17 AM

thats odd all center channel speakers should be magnetically shielded,

maybe you have a bad one? how about exchanging it for another?

--

on the topic of interference, i have an omni cc mirage center speaker, it weighs a hefty 25 lbs and i placed it on my sony 27" wega (it almost spans the entire diameter of the television!) and noticed soomething odd, after turning off the television, i hear extensive static popping as the tv sets in.. i know this i normal, but with the center channel on the tv, it seemed to last longer and louder.

im wondering if its the extra weight of the speaker or does it have to do with the shielding? there is no discoloration on m tv.

but since then i removed the speaker, and im in the porcess of looking for a tv stand that has a top shelf for the center, the tv on the other had still has static noise when i turn off the television, but its consderably less.

does anyone know? im guessing its the extra weight strain placed on the cabinet, i hope itsnothing electrical :/

#3 of 8 OFFLINE   Phil Iturralde

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Posted April 23 2003 - 05:20 AM

Quote:
Is there anything that can be done to improve the shielding?

If the JBL S-Center-II has the correct installed shielded drivers (mid & woofers) then by carefully locating the speaker away from your TV Tube should elliminate the magnetic purple distortion.

Locate the S-Center-II front baffle front edge about 1/2" - 3/4" over the front edge of your 32HS500 HDTV. Use the supplied rubber feet to isolate & secure the speaker from your HDTV cabinet.

If you still have some magnetic distortion, put a book (at least an inch wide or more), underneath the speaker to lift it away from the cabinet, (still over the front edge by 1/2" - 3/4") and if it clears up, then you can get the ... Sanus Accurate TV Top Shelf ...

Posted Image

... to permanently raise it off your cabinet. The size = 19"x16"x.75" (MSRP: $34.99)

I bought one so I could stablized my JBL S-Center downward tilt (towards my couch) from on top of my Toshiba 50H81 50" HDTV and width wise, it just under my S-Center 20-1/2" width - looks very nice!!!

Now, if just raising it off your TV cabinet by an 1" or so doesn't work, ... then it sounds like your mid & woofer speaker drivers are not shielded and then Myo K recommendation to exchange might be the only answer.

Myo K
Quote:
im wondering if its the extra weight of the speaker or does it have to do with the shielding?

The above Sanus Accurate TV Top Shelf might be the answer.

Hope this helps,
Phil
My HT Enthusiasts Google Website
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#4 of 8 OFFLINE   Mark Hedges

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Posted April 23 2003 - 06:14 AM

The distortion got worse as I moved the speaker to the front of the TV. As I moved it towards the back it got better.

As luck would have it I already have the Sanus shelf - I used it on my old TV. I was hoping not to have to use it as my girlfriend can't stand the sight of it but I may have no choice.

I talked to someone at JBL and they said to try a piece of sheet metal under the speaker. I will try that too.

Mark

#5 of 8 OFFLINE   Myo K

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Posted April 25 2003 - 07:58 PM

phil where can i find one of these?

good guys, cc and bb dont have them, my local ht shop doesnt carry them either, are they mainly sold online or something?

#6 of 8 OFFLINE   Chris Tsutsui

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Posted April 25 2003 - 08:53 PM

You need something made of a ferromagnetic material. In otherwords, something that magnets stick to.

If you could find an iron or steel sheet and cut it like with a metal band saw into a square, I suppose that could serve as a cheap shield. It doesn't have to be thick, and it could even be perforated.


#7 of 8 OFFLINE   Phil Iturralde

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Posted April 26 2003 - 02:32 AM

Mark - hope the metal plate works - Chris has some good suggestions.

Quote:
Myo K asked: phil where can i find one of these? ... are they mainly sold online or something?

Well, I bought mine on-line reasoning that the cost would be MRSP $34.99 + 8.25% CA tax locally. Purchasing on-line w/S/H was approx. $29.00 from a 5-Star TOP SERVICE Yahoo Shopping on-line merchant.

So, the following links are from Yahoo Shopping search results, sorted by Low (price) to High (price) ...

This 1st linked option is a lower priced shelf but does not come with any shelf size description or MFG. name ...

TV Top Shelf

Here's the Sanus search results, same criteria ...

Sanus TV Top Shelf ...

... and here's Sanus Systems TV Top Shelf Spec's.

If you do purchase on-line, check out a couple of the 5-Star merchants 'lowest' item price + S/H - for a complete TOTAL. Sometimes, the merchant with a slightly higher item price will be lower (TOTAL) price, when you factor in the S/H.

Phil
My HT Enthusiasts Google Website
---- Toshiba 62HM196 62" 1080p DLP HDTV pic's (#1 in Consumer Reports)
DVD Aficionado (DVDAF) on-going list.
Acquisition Rule #59 “Free advice is seldom cheap.” (Quark @ DS9)
JBL S-Series + SVS 25-31PCi (SN: 00034) w/NSD Upgrade!

#8 of 8 OFFLINE   Myo K

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Posted April 26 2003 - 09:17 AM

thanks for the links phil Posted Image

unfortunately, the max weight capacity for the shelf is 15lbs

my center speaker weighs 25lbs Posted Image





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