[Cvengr]

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These large screen HDTVs generally weigh over 300lbs and with a mount installed crest the 400lb above 4ft over finish floor height mandating seismic design for their installation.

Also their mounting height can be tricky inside a single story 8ft ceiling room, to allow full viewing with other furnishings.

I just installed 5 similar systems in a Data Center made by Samsung and Panasonic. Panasonic was Plasma, but twice the power requirement, but less than 250lb. Samsung required 60% more power than this Sony, and LCD, but weighed over 350 lbs.

[oh8eleven]

These large screen HDTVs generally weigh over 300lbs ...
I have no idea what you're talking about.
I've looked at well over 20 models - up to 70" screen, plasma, LED, LCD - and most weigh around 90 pounds or less.
Even the 80" screens I've found are more like 120 pounds - nowhere near the 300 you stated.

Example:
Product Weight 121.3 lbs. with stand (113.5 lbs. without)
TV Type LED Flat-Panel
Screen Size Class 80"

[Brown Deer]

Wt not yet shown.

These large screen HDTVs generally weigh over 300lbs...

Weight: 176.3 pounds
Height: 44 3/4 inches
Width: 84 1/4 inches
Depth: 3 5/8 inches