Hello Audiophile and Dave,
some details can be pertinent to explain, just in case. One important consideration in cartridge design is achieving a cantilever/diamond/motor design of lowest possible EFFECTIVE mass.
One excellent way of confirming if this was achieved, is to measure a frequency response curve, to read the frequency where the treble resonance occurs. Although the treble resonance is also determined by the stylus shape, one very important component is the cantilever EFFECTIVE mass.
"Effective Mass" refers NOT to weighing how many milligrams the diamond/cantilever/motor weighs! "Effective Mass" is really, the mass that is APPARENT at the stylus tip, which depends on the weight of these three components, plus the critical place where the magnet (or coil) are placed...as if balancing a seesaw.
The closer the magnet is to the fulcrum, the lower will be the APPARENT mass at the diamond end. The farther from the fulcrum the magnet (or coil) are placed from the fulcrum, the HIGHER will be tha APPARENT mass at the diamond end.
You can experiment with grabbing a rod about 3/4 of the way, and moving with your hand the long end of the rod. As you grab the rod closer to the middle, the heavier it will feel to move the rod. But as you grab the rod farther to the other end, the lighter it will feel to move the long part of the rod...if you see the analogy of bringing the magnet closer to the fulcrum (which is the spot where you actually grab the rod...or, more precisely, where the system TENDS to like the fulcrum to be...as studied by Ortofon while designing the Super OM series).
All this is to alert you to the fact that the EDR.9 has a cantilever that LOOKS heavy! But looks are not the determining factor in the effective mass of this cartridge...nor, for that matter looking at the cantilever of the Shure V15 V...which is still documented to this day as the cantilever with the lowest effective mass of all cartridges.
What determines the effectiveness of the designer's consideration of mass is the performance...where low effective mass will show a very high frequency resonance...helped, no doubt by an appropriate shape of the stylus.
Such is the case with the EDR.9, where the design management of the cantilever/diamond/motor are such that the treble resonance is at 38 KHz, and, and, and, this is also confirmed by a separation curve which maintains separation all the way up there...which is also the case with the EDR.9 (a cartridge that has reached its high frequency resonance will show a marked diminution of separation at the resonant frequency, and on up after that, where separation can actually disappear, as if playing a mono cartridge).
In other words, the visible part of the EDR.9 cantilever looks comparatively large, but the motor is extra-light, being a small iron sleeve, instead of a "heavy" magnet. Furthermore, the iron sleeve is place at the fulcrum, thus virtually eliminating its contribution to total EFFECTIVE mass.
This consideration of mass is also managed by installing a very small diamond, which really is the smallest part of all the moving system.
Further considerations of mass: a solid cantilever rod of whatever material (aluminum, ruby, diamond, sapphire, berrylium) will have higher mass, than one TUBE of the same material and dimensions!
That's why the Shure V15V cantilever is so light...it really is a very thin FOIL of berrylium rolled into the shape of a tube. No other cantilever has been documented as lighter than this one.
So, don't let anyone tell you that the cantilever of the EDR.9 LOOKS large and heavy. It's not how it looks, but how it works, as part of a complete engineering design. The proof is in the pudding's taste, not on its looks. Just enjoy how it sails easily through clean LPs with treble tracks...cymbals, sibillants, high violins, high-hats, making sure you have a clean stylus...OK? Have fun.