best sounding cartridge with VPI Scout Turntable


I RECENTLY PURCHASED A VPI ARIES SCOUT TURNTABLE WITH A
JMW-9 TONEARM ,AND A DYNAVECTOR MOVING MAGNET
KARAT 17D2 CARTRIDGE. I AM USING A PAIR OF QUAD 988'S
A MARANTZ SACD PLAYER WITH THOR AUDIO PREAMP AND THOR MONO BLOCKS. THE SOUND WHEN USING THE MARANTZ PLAYER IS GREAT, WHETHER IT BE CD OR SACD. WHILE PLAYING STATE OF THE ART
180-200 GRAM VINYL RECORDS THE SOUND SEEMS THIN IN COMPARISON TO TH CD PLAYER. ALSO I MUST TURN THE GAIN UP
WITH THE TURNTABLE IN USE TO GET THE SAME FIDELITY THAT I RECEIVE WITH THE SACD PLAYER IN THE LOOP. WOULD A HIGH OUTPUT MOVING COIL CARTRIDGE IMPROVE THE SOUND QUALITY. I AM
LOOKING TO FIND OUT WHY SO MANY SAY VINYL SOUNDS BETTER THAN
REDBOOK CD AND SACD. I FIND REDBOOK CD WITH THE MATRANTZ
SUPERIOR TO MY VPI SCOUT SET UP MENTIONED ABOVE. I HAVE THE
TURNTABLE ON A BLACK DIAMOND SHELF. WOULD A BETTER CARTRIDGE MAKE A NOTICEABLE DIFFERENCE. THANKS.
kjl
Don't know which Thor Pre-amp you are using. Is it possible that you have not set the cartridge load properly? The Dynavector cartridge you mention is a moving coil cartridge with a .23mv output and not a moving magnet as you said (unless there is some other version of it). The Thor TA-2000 seems to have the option of switching loads in its Moving Magnet section from: Resistor 470k, 47k, 1k, 100 Ohms. The moving coil section of that preamp is auto-loading so no need to set it. If you are running a moving coil cartridge through the moving magnet section of your pre that may explain the poor sound quality. Check that you've matched the load to your cartridge output.
Check your VTA.
As Jax2 says, the Dynavector 17d2 is a low output MC cartridge, not MM. You likely using the wrong input on your phono stage. You'll need probably the highest gain setting the unit has to accept the Dynavector's low output.
If, after you tried the recomendations of the very knowledgeable fellows above, you still have the problem of body-less sound, give the wood-body Grado's a try. They feature a ripe well rounded midrange.
Sounds like you don't have enough gain for your pre-amp. Quicksilver Audio makes a step-up transformer for $450. This device will boost the gain of your cartridge and adjust the impedence so you can use it with moving magnet phono stage (which 90% of them are).