Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What is the total width and depth of the top of the unit where the TV would go?
Document: Vertical clearance was especially important since the center speaker I will be using is 8.5" tall -- too tall to simply put on the very top since it would block part of the TV. I would also have 6 components in the unit with a TV on top (very similar to the picture here, actually), but since I wanted to keep the TV at roughly eye level, that meant a small number of wide shelves rather than several narrower shelves stacked to make a tall unit.
Each tempered glass shelf has dimensions of 17" depth x 56-3/4" width x 1/4" height. The overall TV stand dimensions are 18" depth x 59-3/4" width x 23" height.So, here's how the spacing between shelves works out: holes for the shelf supports are drilled 10" apart. Each tempered glass shelf is 1/4" tall and each metal shelf support is 1-1/2" tall.
I got a NAD T975 amplifier which weighs 70 lbs so I was worried if the stand could support it. I called Sonax customer support and they were great. The girl didn't know the weight capacities but found out and got back to me within 15 mins. For those interested the weight limits are:Top (TV) shelf = 200lbsBottom/mid shelf = 100lbsIt handles my NAD T975 great except that I have to have it sitting sideways because of the component depth issue.
(recommend a two person job or dolly for support)The verdict:For the price and quality I do not think you will find a better TV stand. If you have a similar theater set up and you expect to be able to have a TV and speakers on the top shelf I do not think you can go over 42 inches for the TV (you can also mount the TV to eliminate the overcrowding). If you only have a TV then you have nothing to worry about.
This will be a 2 part review. The first part will be Sonax's customer service. The 2nd part will be for the unit itself.Sonax Customer Service: One word - EXCELLENT! I called because I wasn't sure which TV stand I wanted. I was concerned with the dimensions of the shelves because I was afraid not everything would fit (some components were too tall, some were too deep). The very first thing the customer service rep said was, "Which stands are you looking at?
I used a power drill on a low setting with an attachment to make short work of each screw (making sure not to over torque and ruin the stand or strip anything).2. I wish the length was a bit longer. It does fit the 42 inch plasma Sony I have currently with the Newton M60 bookshelf speakers however with a larger TV it would be a bit more cramped on the top shelf3. The packaging weighs a TON.
A solid wall would risk my components overheating, but I didn't want to have no wall at all because I thought it wouldn't look very good, especially since it would be exposing the substantial cabling I would have back there.This unit had it all. It's not mentioned or shown in their online literature or images, but I confirmed with Sonax before buying that the rear panel has a mesh perforation look for ventilation -- think cheese grater, or the front of a Mac Pro.
Sonax b-051 was easy to assemble, the measurements were as quoted, specifically the space for the height between shelves. You just have to install equipment through the top with the glass removed if the space is less than 1&#34; or so clearance. The quality of the wood was not the greatest, if you had to move the shelving around quite a bit you would begin to notice slight imperfections in the wood or it wood chip a little.
One glass shelf has the brand name "Sonax" written attractively in it. The instructions specify that it should be the top shelf, but don't say why. Originally, I didn't even notice that the instructions said that. I first installed the "Sonax" shelf as the bottom shelf, then decided on my own that it would probably look better on top. Now that I'm aware of the weight limit differences, I'm glad I made the switch.
Especially when you have a Receiver with speaker and HDMI cables running to it.Advice: try to space out the cables using the other holes on the same level.3) Sonax has their logo in the glass on the top shelf. I haven't looked too carefully into seeing if it is removable, but I think it's between the layers of glass. This makes it look a little less classy.Though it really is a nice, well built stand. It would have been 5 stars without the above minor issues.
Answer: Glass shelf measures 56 3/4" X 17"