I was under the impression broadcast console designs put extra effort with regards to noise and especially crosstalk.
Balanced summing,robust ground schemes and some +8dBu nominal outputs.Maybe just the good ones.
Yes, superb desing and quality to be sure but things like balnced summing are used to get THE best noise performance it seems when headroom rules.
D. Self* quotes the Neve 51 series (not so dusty mixer peeps?) as having internal levels down at -16dBu giving a 36dB headroom at the expense of noise which matters little given the limited S/N of even the best FM broadcasts.
*Small Signal Audio Design and Self is a world famous audio designer from way back to Wireless World days. Big contributions for Soundcraft. I am presently working my way through his book on solid state power amps. LOT of sacred cows getting shot in that, I might make an even bigger nuisance of myself soon! (once/IF I come to full grokking)