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Rack info

Ive got some questions about racks.
Ive seen racks that say they are 4U or 6U and heads and other rackmount items that say the same thing. How much is a U? Becuase clearly a 4U case has more than 4 holes.
This may seem like a silly question but when do you need a shallow rack case or a deep one? Is it merely based on the overall length of what is going in there?
And lastly does anyone know what rack space a Backline 600 head is and if these ears would fit?
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Thanks!
 
Yup, 1-3/4" equals the height of one U space in a rack. And a 19" rack is NOT the width that slides between the rack rails, it includes the rack rails and ears on your rack-mounted gear.

Another thing to consider... not all rack-mounted devices are the same depth sticking into your rack. And not all racks are the same depth. You'll notice this most when rigging up very powerful PA-sized power amplifiers. Go hit a store and inspect the different rack cases. You'll find the typical "effects racks" are only around 12-14" deep, while full-size rack cases can be up to 20" deep. Make sure if you buy a rack, you don't buy a shortie when you need to fit deep devices into it.