I also have the Aries, JM 10 in and the original ruby2 which has a lower output than yours. I use the ARC PH3se phono preamp and get a full frequency response and a quality sound. My cables are Tara Decades which are a little briter than my old arc litzlink I used to use but this is merely a tweek, so I would demo a different phono preamp before monkeying around with cables. I also use an isolation sandbox and a low resonance type table to rest the aires on, both will help. How far away from those dunlavys is your aries? The resonance will kill your sound! This type of stuff all makes a difference. Remember that vinyl may sound better, sweeter etc but I think that you will never get as much "slam" from a disk vs a cd. Also there are major variations in recording qualities on records, so test using a great recording and enjoy!.
Help LP playback is lacking
My system is awesome playing cd's but when I play vinyl it sounds bright and lacks bass and lower midrange. I am using a VPI Aries,JM 10 inch arm and Benz Ruby H. The rest of my system is a CAT Ultimate preamp, Wolcott Amps, Dunlavy V's, Jps interconnects and Synergistic reference speaker cables. CD playback is Muse 8 and Muse 296. What's the problem?