High Def Forum
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01-31-2005, 12:30 AM
I have a Sony KDF-42WE644 lcd rpt and am adding a subwoofer to my HT setup. I was informed by salesman that my tv is immune from any non-magnetic shielded subwoofer/speaker and that I can place as close to tv as I see fit. Can anybody confirm this? I know you can't do that to CRT tv's, but I don't know if that applies to mine.
Any input would be greatly appreciated.

01-31-2005, 01:33 AM
that the tv is "immune" from RFI or EMI just because it's LCD.... Have a look at the manual... I believe you'll find something reffering to the FCC standard of not causing RFI but that it must accept RFI or something to that effect...

As far as any non-magnetic shielded speaker.... Well speakers have magnets... that's just the fact... Unless they are the ultra thin flat panel type which work from having the panel excited electrically....

Shielded yes.... Non-magnetic... poor choice of words... a decent HT sub that is shielded should be fine... different levels of shielding and not all sheilded speakers work 100%... manufacturing defect etc...

Starting to ramble... With a decent HT sub the proximity to the LCD shouldn't be an issue...

BTW with a good quality pair of shielded speakers they can be close to CRTs also.... Mine are...

01-31-2005, 02:35 PM
EMI is not the same as RFI. LCD projection televisions are not affected by ElectroMagnetic Interference as much (or at all) as CRT or CRT rear projection televisions. That's in part because the CRT based televisions use a phosphorous grid and a magnetic field actually warps the image by interfering with the electrical arc of the "gun" as it "writes" across the phosphorous grid.

01-31-2005, 02:41 PM
There are a couple of easy ways to fix EMI caused by a subwoofer. The easiest way to prevent is not to have the subwoofer as close to the television. And that all depends on the strength of the magnet that is contained within. My advice...don't worry about it until you notice some funky colors appearing on your screen, and if it does...move the subwoofer way from the screen. But you will not have that problem on a LCD RPTV...