I have not been on here for a while guys so I apologise if this point has been raised before:
The recent WhatHifi review of Blu MkII was very complimentary and I think the vast majority of it was fair and well written but I must question one conclusion. That is the preference for the dither switch set to ON for CD playback. They may like the effect of introducing dither but it is a step away from what was recorded. Perhaps they simply rushed this aspect of the review I don’t know.
I’ll choose a very well known track as an example to explain what is happening to the sound: David Bowie - ‘Aladdin Sane’ from the album of the same name.
Listen to the piano for the whole track with dither switched ON and then listen again with it OFF. The former makes the piano sound more and more unnatural as the pianist plays more frantically. (This is much more evident after 2 minutes when the outro solo begins). It is as though the recording has been doctored with short samples of piano notes being used rather than a recording of the entirety of the notes and acoustic, whereas the latter plays both the note and the acoustic for as long as they reverberate. I think the Dithered sound is losing perhaps 5% of acoustic tails of all notes and the piano itself nolonger sounds like a true acoustic instrument with dither ON. The warmth of timbre has gone. It sounds like ‘short sampled’ piano and reminds me of early 16 bit sampling machines. I suspect I could replicate what I am hearing quite well if I had access to the piano recording alone and I normalised that recording and then wiped all data below a certain dB threshold. That is what I am hearing with the dither switch ON.
https://www.whathifi.com/chord/blu-mkii/review?utm_campaign=BLU MKII Promotion&utm_content=80988710&utm_medium=social&utm_source=facebook&hss_channel=fbp-110747222358641
"The Blu has small toggle switches on its rear panel to govern the degree of scaling involved – we end up leaving this on maximum – and another to vary the amount of dither (random low level digital noise) added to the signal.
Why would you want to add noise to the data stream? Using dither is a well-known technique in digital products to help improve resolution at very low signal levels. Here it only works for 16-bit signals, letting 24-bit streams pass unaffected.
With CD, we prefer the sound with the added dither as there’s a slightly greater sense of solidity and overall subtlety. You’ll need a truly transparent system to hear it though.’"