Magnepan 1.7 too bright, HELP


I just bought a used 6 month old Magnepan 1.7 and hooked them to my old system, which consists on a Deonon 2900 Universal player, Emotiva USP Preamp and Rotel 1080 power amp and use anticables for speaker connections, and monster cables for interconnects.

The sound is too bright for me, I used the provide 1 ohm resisters, still too bright, any recommendations.
bnrimal
I would look at your source first,then I would dump the emotiva I had one for two weeks and sold it my old hafler sounded much better its not the maggies.Try and find a tube pre after looking at your source first.Do not bother with cables they can be changed later.I wish I had the maggies they are fantastic much better than the ones I had.
Thanks for all the interesting suggestions, I guess I have at least a few weeks project ahead of me, experimenting.

If I were to change one of the electronics, to make things a little warmer, cd player / pre-amp / power amp which one would be the best bang for the buck, I cannot afford to change all three at present.
I understand every system is different. In my case, I don't have luck in SS preamp. I always feel the sound is too bright and sometimes harsh. I tried upgrade cables, no significant improvement. I tried to change to another SS amp, no luck. I tried to add a DAC with tube buffer, no luck. Until I change to a tube preamp, I start to see the improvement. So, I would suggest to get a nice tube preamp. I am not sure what is your price range, tried to search for the thread for best tube preamp under $1000. I remember some of the suggestions are Mapletree 4 SE, AES DJH, PrimaLuna Prologue 3. I am using a PrimaLuna Prologue 3 now, very good preamp. But you need to pay attention to its very high output impedance and 12dB gain. You need an amp with at least 100k ohm input impedance.