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I think that the Expressimo Heavyweight counterweight should be on your short list for good mods. They also make a VTA collar for a reasonable price. They might make you a package deal if you buy both. That arm would do well with a DL103R on it. Also, put a small section of black heat-shrink tubing on the finger-lift of the headshell. This is known to be a microphonic part of the arm, and heat-shrink tubing deadens it down nicely. Make sure that the big nut holding the arm on is only finger-tight. Too tight on that nut will deaden the sound. Also, the glass platter tends to ring a bit, so some deadening on the underside of the glass, or a Ringmat or something may help with that. Put it on a lightweight rigid stand. And always completely remove the dust cover from the TT when you play it, and replace it when finished. It sounds better with the dustcover completely removed. That should about do it. Enjoy!
The PX 3 remains a true joy to use and listen to. Recently found an Sumiko Acrylic Mat. Using it on the PX 3. This has made a tremendous difference. The PX 3 with this simple addition has moved several steps up on sonic signature. Separation and soundstage dramaticaly improved.Plus the PX 3 is fully auto/with manual over ride.For plug and play with superior sonics the PX 3 is a hands down winner.
The Rega Planar 3 with RB 300 arm is a hall mark table in all respects. The midrange and treble you speak of is only slightly there. This has more to do with the Sumiko BP. Thats why I loaded it at 100 ohms instead of 47K ohms. It has been said that the acrylic platter, that replaces the glass platter totally addresses the issue you have menetioned. Plus a change in cartridge is in order. If this is a keeper it will get a Dynavector or Benz cartridge.
When new the Rega Planar 3 was $775.00 while the PX 3 was $695.00. So price wise the comparison is on target. However both are vastly different in their execution. The PX 3 is a techno marvel, with superb sonics. While the Rega Planar 3 is a high end hobbyist table, with great potential. At this point in time, if push came to shove and I had to live with one the PX 3 would be the keeper. However as time goes go and the tweaks and mods are done to the Rega that might change as well.
But neither of these tables can compete with the Oracle Alexandria. But again there is a vast price difference here as well. Oracle has just released their acrylic mat and this has pushed the sonics of the Oracle further up the sonic spectrum. Appears that acrylic mats and platters,have a clear and decided edge in music reproduction. Just amazing to hear the difference.
Have installed the Expressimo Threaded VTA Adjuster. This is a very worthwhile addition to the Rega RB 300 arm. Allows precise adjustment to get the cartridge right on to the manufacturer specifications for the cartridge you may be using. Highly Recommend the VTA Adjuster.
Also have installed the Acrylic Platter. I am a big fan of acrylic mats. Using them on the Oracle and Yamaha PX 3, major improvement there. Totally surprised to find no improvement in the Rega when using the Acrylic. So have return to the Glass Platter. It is simple the Glass Platter on the Rega just sounds better...period. Do not recommend the Acrylic Platter for the Rega.
Soon will be trying the other mods - will keep all posted.
Have had the Expressimo off center counter weight installed now for about 5 months. Have to admit that this is another worth while upgrade to the Rega turntable. It has elevated the peformance of the arm to another level. Sound stage and definition have improved considerably.
So if you have a Rega table with Rega arm this is a improvement over the stock counter weight.
I have seen another counter weight for the Rega arm, that seems to be getting a lot of press lately. It is from J.A. Michell. May try one of these to compare the Expressimo.
If anyone has first hand experience with the J.A. Michell on a Rega tone arm, let me know.