Tutorials are constantly found on the Internet on how Dry Aged Meat can be matured in the refrigerator. Maybe, for individual cases, this is an alternative, but this does not replace the dry-aging fridge, as it holds a high risk for contamination of the meat, thereby making it inedible.
In order to produce a correct maturity, Dry Aged Beef needs not only cool, but also clean air- and that only happens in a specialised dry-aging fridge like the DRY AGER.
... temperatures cannot be obtained with a normal refrigerator ...
Not only cool, but also constant
For a successful dry-aging of meat you need low temperatures. Temperatures between +1,5°C and +2°C are regarded as being ideal and in addition, these can be held to precisely within a tenth of the appropriate temperature.
Theses temperatures cannot be obtained with a normal refrigerator that has a thermostat- controlled regulation, even electronically controlled refrigerators have a fluctuation range of many degrees, which prevents a professional Dry-Aging.