1. 
   dBRN
   decibels above reference noise
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   dBrn
   dBrn through a C weighted audio filter, matches the ear's response.
   Found op http://www.encyclo.co.uk/local/20957
   
   
3. 
   dBrn
   Power level relative to noise, dBm + 90
   Found op http://www.encyclo.co.uk/local/20957
   
   
4. 
   DBrn
   The symbol dBrn or dB(rn) is an abbreviation for decibels above reference noise. Weighted noise power in dB is referred to 1.0 picowatt. Thus, 0 dBrn = -90 dBm. Use of 144 line, 144-receiver, or C-message weighting, or flat weighting, can be indicated in parentheses. With C-message weighting, a one...
   Found op http://en.wikipedia.org/wiki/DBrn
   
   
5. 
   dbrn
   1) Decibels above reference noise
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/dbrn/1
   
   

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