When E30 is connected in Pre mode, a slightly larger pop noise is output when switching between different bit rate songs.
Pop noise is generated even when the power is turned on / off.
It comes out regardless of the volume level of E30.
The noise level is a little disturbing, but you can ignore it and use it.
I have both D50s and D70. The D50s is good regarding pops, no "needle dropping" even when switching between different frequencies (except well known PCM 384kHz pop). D70 is also good if using RCA output. But if I use XLR to RCA (regardless of DAC/Preamp mode), it is popping/needle dropping but somewhat differently depending on the Foobar2000 output settings. For PCM frequencies above 96kHz it makes an audible pop (like needle drop) on every track change, even when jumping forward/backward inside the tracks. DSD is also problematic. Interestingly, if I set DSD transcoder plugin within Foobar2000 and output through the DSD:ASIO, DSD will work OK through the tracks once it switches frequency. And the display will constantly show the same frequency until frequency change. However. For PCM frequencies above 96kHz the content on the display changes every time I change tracks or jump forward/backward inside tracks. Since D70 also uses an AKM decoder as does the E30, for now I won't even touch the E30 with a stick. It smells like the same problem. But I believe it could be related to the Topping driver so maybe it could be fixed in some future release (somehow).
Edit: found out the problem is related to the SACD plugin. Some older versions (the one that is packed inside the Topping driver) actualy work and don't mess with sample rate change on playback start.
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