i'm going to be brutal in this....so i hope you don't get offended
you took a wrong amp to drive the speakers
1. marantz may not be powerful enough to drive your dm 2/7.......ur dynas are 86db and you need at least a 200watts 'min sine' wave to drive your dynas. you also need to understand that the role off frequency for d dyna is 50hz....naturally you will find the 40hz range and below lacking. a full 3way would be better.....although if you look at high end bookshelves like SF Guaneri...those r different level of playing
2. your speaker positioning might be wrong. how do you position your speakers from the rear wall and side walls?
3. your speaker stands, the spikes and foot and might be setup wrongly. how tight you tighten up your spikes and shoes?
4. your speakers need 200hours run in....especially the mids
5. your power feed might not be clean or filtered too much or might even be not enough
i'm very familiar with dynaudio because i have been using them for many years and even have them in my car now...dynaudio is well known for its punchy mids and bass.....so if you are not getting such sound....something wrong with the setup
yes.....i have the dynaudio 240mk2 installed in my car.....and the only amp that can make it really sing is a macintosh....you are welcome to audition it in my car
krell S-550i in my opinion is not the full picture.....albeit it is a better amp compared to the marantz...driving the dynaudio with it is the right thing to do
without the right setup....your sound is still shitty...so you need to understand what went wrong with your current setup
next issue is going to be your power supply for the Krells....really power hungry
i hope you have dedicated power cable from your fuse to your wall socket.....and you have to have a high current cable like 10mm to 14mm otherwise it might make your amp sound limped
and your krells have XLRs....naturally they will sound more meat and louder.....which also means good XLR interconnects come into the picture
with such budget......you may want to look at Audio Research or Mcintosh
personally i'm running Audio Research cd and amps, Sonus Faber speakers, transparent Reference mm2 and Ultra interconnects and speaker cables, nordost power cables, quantum resonant power stuffs and harmonix tuning feets
at this level, even the damn rack makes a difference
a platform for the power makes another improvement
my final journey is the ultimate room dimension setup with the right power factor, floorings, sound proofing and the entire works
as to answer your question about which speaker is right...there is no right or wrong
focus on the very basic fundamentals and right setup
you can find my setup in the Sonus Faber tread.....some many post back
Thanks a lot for the advice. Really appreciate it. Be brutal, at least someone is telling me something I don't know.
1) Does this mean that I do not need new loudspeakers as the Dynaudio that I have now is sufficient?
2) Ya. Those Krells are power suckers. That is why I am having TNB come around to alter my incoming juice from 1 phase to 3 phase. I am already seeing my bill shoot up. Am cabling two dedicated power lines directly from the fuse box to the wall sockets.
3) Haven't put in the spikes yet. Been busy at work. Just can't get good help these days. Kakakakakakaka.
4) If I don't have to dig into my retirement savings for the loudspeakers, maybe I will get some power conditioners for it. Those buggers cost a pretty penny too.
5) Yep. I am using balanced Nordost XLR for the new setup.
6) No sound proofing. My missus will kill me (again) if I had that installed. Somehow my man cave is also an alternative store room for her stuff whenever she needs it. Maybe I should invest in a good door lock as well.