The main problem with upgrading a rega is using non rega parts on them. They are designed to where every main part has a different resonance and when you mess with them they can have serious side effects. The other thing is when you get one right they can be magical but finding the right cartridge for them can be tricky because of lack of adjustments on the tonearm. I do know that the Ortofon cartridges are on the bright detailed thin side on them. You might want to try a more warm brand of cartridge that has more body like a Dynavector 10x5 or 20x2.
Rega Planar 3 : Heavily upgraded yet produces a sound that I don't like
I have the Rega Planar 3 turntable for 30 years now. It had
an original everything including a 100$ nottingham analogue cartridge/stylus.
Sound was not bad but pretty basic....
A few years ago I started upgrading it. I did all the
upgrades together and the result is... not good. The sound is very accurate but it is too bright, there is almost no
Bass and drums have no attack whatsoever.
I can't eliminate where the problem is because all upgrades
are irreversible.
I know that the
Ortofon Rondo Red has a very bright sound but still...
Here is a list of the upgrades :
1. ISOkinetik ISOvert Rega Tonearm VTA Adjustment Kit
2. Cardas Litz purple phono cable
3. ISOkinetik Tonearm Low CG weight
https://www.analogueseduction.net/isokinetik-upgrades-and-parts/isokinetik-isoweight.html
4. Ortofon Rondo Red Cartridge/stylus
5 Linn Linto phono pre amp (an old but outstanding piece which has a cult following).
6. I use Rega Elicit Apmplifer