What is the difference between black background and low noise floor?
Is black background what you get when you have a low noise floor?
My audio system has for years had a black background, but when I blind tested my current DAC, which has an extremely low noise floor, it quite clearly revealed more musical information and in particular better imaging. The imaging was noticeable specifically in relation to a piece of music I’d heard only a few days earlier and which was unsatisfactory with my existing DAC at the time (Martinu’s Nonet no 2).
With regard to live performance, the venue I currently attend the most is the Royal Opera House. The audience is generally extraordinary respectful and you can usually hear pin drop. I can only recall two disturbances in recent years, once when someone booed a 12-year-old performer and the other when someone hit the deck after suffering a heart attack. The former occasion hit the national newspapers.
Other classical venues in London are equally good, nothing betters the Wigmore Hall, in 100s of performances I’ve barely heard a single cough. One exception was an American chap who fell asleep and started snoring.
I was once at the theatre and someone’s mobile phone went off. The lady then retrieved it and dropped it down the side of her chair, where it continued to ring for about 15 minutes. I remember the lead actress was Imelda Staunton and it kept going rather than complaining, because the guilty party was Dame Gail Ronson, a benefactor of the theatre who also happens to be honorary president of the Royal Opera House. I guarantee she would’ve switched her phone off at Covent Garden.
I’ve been at La Scala where people to the right were constantly chatting through the first act and the lady to the left of me was texting. Once at Palais Garnier in Paris the lady next to me was videoing the performance.
So I suspect the level of background noise depends where you live as much as anything. Acoustics are also relevant, the Wigmore Hall has a glass roof and in storms you can hear the rain, and the Albert Hall in Kensington has a terrible echo. One of the finest recording venues until it was knocked down, Kingsway Hall, used to rattle when trains passed underneath, and is audible on many Decca recordings.
Such are the joys of live performance. However, when you have the dynamic range offered by a symphony orchestra, in live performance you can always hear the quiet bits (for example the openings of Mahler 1 and Shostakovich 2), but these are extremely difficult to record and require significant compression. When I tried out DSD I chose a live recording of Shostakovich 2 and I just couldn’t hear the opening with my volume set at the normal level. So I turned it up and then got blasted.
So with digital, I’ve always focused on a low noise floor, which will reveal the most information available from the recording. However, in terms of actually being able to hear something approximating to what you would hear in the live concert hall, you really are at the mercy of the recording engineers and, in some cases, their near impossible job.
The term black background perhaps should not be banned, but hopefully should be redundant because these days there is no need for background noise given the quality of audio electronics even at a very modest price.