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5 dB more dynamic range is a good on paper beat. I would generally dismiss the extra output level as unnecessary (can't say I've ever heard someone wishing for more output level) while API made marketing hay with their 40V rails and discrete circuitry back in the day.EIN is a respectable metric to improve but many well executed designs were already bumping up against theoretical noise limits. A dB less of input noise might be audible in a shorted input WFO listen, but unlikely to make a serious difference in real world recording in the context of microphone noise and ambient room noise. When you get down below say 2dB NF a dB of improvement can get pretty expensive.Next comes preserving this near theoretical noise floor when summing together tens of channels. Good practice, virtual earth summing amp structures generally suffer a N+1 noise gain. We didn't have modern uber op amps back in those days so this was an area for investing design effort.I wrote a magazine article back in 1980 http://www.johnhroberts.com/des_art_1.pdf "Performance limits in contemporary console design". I feel like I need to apologize in advance, I spelled bus wrong over half a century ago, and the contemporary also refers to SKUs from 50+ years ago. JR
5 dB more dynamic range is a good on paper beat. I would generally dismiss the extra output level as unnecessary (can't say I've ever heard someone wishing for more output level) while API made marketing hay with their 40V rails and discrete circuitry back in the day.
EIN is a respectable metric to improve but many well executed designs were already bumping up against theoretical noise limits. A dB less of input noise might be audible in a shorted input WFO listen, but unlikely to make a serious difference in real world recording in the context of microphone noise and ambient room noise. When you get down below say 2dB NF a dB of improvement can get pretty expensive.
Next comes preserving this near theoretical noise floor when summing together tens of channels. Good practice, virtual earth summing amp structures generally suffer a N+1 noise gain. We didn't have modern uber op amps back in those days so this was an area for investing design effort.
I wrote a magazine article back in 1980 http://www.johnhroberts.com/des_art_1.pdf "Performance limits in contemporary console design". I feel like I need to apologize in advance, I spelled bus wrong over half a century ago, and the contemporary also refers to SKUs from 50+ years ago.
JR
