Hi friends!
Thanks for your suggestions. Sorry for late reply, but I have an update and few observations and questions.
I have added a fx audio x03 dac in the chain and sound has improved. It has ess chip and only usb input and rca output. I found this dac more suitable for my system in comparison to smsl su1, which I found a bit brighter side. Now my Marantz pm7001 is sounding BETTER if not GREAT. So I am enjoying my music library these days. I am still not sure if the dac has improved the sound or my speakers have opened up a bit more or may be I had made peace and got accustomed to the sound. Any way I will still look forward to get it improved further.
I have also placed one blind order for another dac, smsl d4s. It has got a display and more connectivity options and I hope my search for dac will end here.
Besides above, I have few observations and questions.
1. I am using a window laptop and foobar2000. There are some ASIO plug in or Wasapi exclusive mode etc. which are required for higher bit rate or bit depth play back. Right now my music library consist of 44.1 khz (cd quality) flac, wav and mp3 files. Do I require them? Any other settings required?
2. I am yet to decide on my purchase of streamer. Before this I want to have an idea of high res music if these sound any better than some of my collection. I mostly listen to Bollywood and rock of 1970-90. My wife has a iphone, so can I stream apple music through it by connecting phone's usb to dac usb? Apple music has free one month trial. Apple music through laptop sounds bad. Or suggest any other music service. How can I use my laptop as streamer?
3. Some mp3 files sound much better than flac file. For example I have two files of Jethro Tull's album 'Minstrel in the Gallary'. One is 192kbs mp3 (file size 60mb) and another is flac (file size 1.7 gb). There is noticable difference between the two. Treble is subduced and sound stage restrictive in flac file. I don't know what data is there in 1.7 gb?
4. In 2009, when I purchased marantz, I had auditioned Norge 1000. It is a good amplifier but marantz was better. I didn't auditioned any higher class amplifier at that time due to budget limitation and time/effort required.
Cheers!