Question 1

31.5" x 20.8" x 6"

Accepted Answer

The dimensions in the description are the question.  What is the 6" size?  Presumably it is the depth although the picture is clearly not 6" deep.  The other answers indicate that the depth is 18in which is what would be expected.  Perhaps the description for this product and the 12U product will be updated.

Question 2

What is the depth of this unit?

Accepted Answer

From front to back, the rack is 18" deep.  From side to side, it is 20", which allows standard 19" rack mounting on the frame.http://www.samsontech.com/site_media/legacy_docs/SRK%20Mechanical%20Drawing.pdf

Question 3

What is the height of this unit?

Accepted Answer

According to http://www.samsontech.com/site_media/legacy_docs/SRK%20Mechanical%20Drawing.pdf 
Model.....Depth.....Racking Height.....Total Height.....Width 
SRK-8.......18.11...............16.54...............20.47...............19.96 
SRK-12.....18.11...............23.62...............27.55...............19.96 
SRK-16.....18.11...............30.7..................34.65...............19.96 
SRK-21.....18.11...............39.37...............43.31...............19.96 
All measurements are in inches

Question 4

hi what are the internal dimensions? would equipment that is 18Wx17D fit comforably? also what is the weight capacity of each shelf?

Accepted Answer

There are NO SHELVES. This is a real nice, heavy castor rack mount stand for amps, preamps, electronic crossover, power conditioners and such. It allows 18" for width, 18.25" deep but allows rear overhang because their is no back. This is for rack mount equipment and comes with rack mount screws and screw holes to mount any equipment to the face of the rack (each side). The bottom shelf could easily hold over 500 lbs. I have two 4,000 rms amps, a 2,500 and a 1,400 watt amps for a total of four. these easily weigh 300+ lbs. I additionally have a dbx-3bx, a two way stereo electronic crossover and a furman power conditioner. This is not a typical stereo component rack w/ shelves. This is a heavy component rack for rack mount pieces. Typically they mount to the front of rack with four screws (provided) each on the front corners of component. Behringer EUROPOWER EP4000 Professional 4,000-Watt Stereo Power Amplifier with Atr (Accelerated Transient Response) Technology. Cut and paste this description to amazon & you'll see my power amp with the four mount holes on the face of the amp. Any further questions, I would be more than willing to help you find what you need.

ASIN	B001B84JPW
Brand	SAMSON
Color	black
Colour	black
Compatible Devices	Laptop, Desktop, Server, CPU, Audio Equipment
Compatible devices	Laptop, Desktop, Server, CPU, Audio Equipment
Customer Reviews	4.6 out of 5 stars 610 Reviews
Enclosure Material	Alloy Steel
Global Trade Identification Number	00809164004776
Is Assembly Required	No
Item Type Name	12-Space, 19" Universal Equipment Rack
Item Weight	16.51 kg
Item weight	16.51 kg
Manufacturer	Samson Technologies
Material	Alloy Steel
Mfr Part Number	SASRK12
Model Number	SASRK12
Mounting Type	Rack Mount
Number of Items	1
Number of Packs	1
Size	533.4 cm x 48.26 cm x 60.96 cm
UPC	809164004776
Unit Count	1 Count
Weight Capacity	Minimum weight: 136.08 kg

Samson SRK12 Universal Rack Stand- Black

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