Hello Rtn1,
I also have experience with both REX and LA-300 and in many respect it matches yours and as a cello player I prefer "300" - its sounds (mosatly midrange where life is) more authentic to my ears, more as real cello including bottom octaves.
REX has tremendouns power supply, technologically may be better then "300" and its bass control is iron clad, no question here. With LA-300 I have similar bass, may be not as tight but somewhat richer and more accurate and I prefer it again (very slightly) by Joule-Electra. This preamp drives my Spectrons amps and B&W 802N speakers
Two points: for my ears the Cardas wire always show very good midrange but somewhat weak bass. I am not familiar with Jade Audio but all hi-end J-E preamps have David Elrod hook-up wire and I listen with David's interconnects which clearly add to the synergy.
Secondly, if you prefer XLR and very powerful power supply then you should compare REX not with "300" but with LA-450ME. Its power supply contains three times more energy then LA-300 and in separate chassis( and while its less important REX and 450 cost about the same while 300 is about 50% cheaper....)
To say that you made poor choice with REX - nobody will.
Congratulation!
I also have experience with both REX and LA-300 and in many respect it matches yours and as a cello player I prefer "300" - its sounds (mosatly midrange where life is) more authentic to my ears, more as real cello including bottom octaves.
REX has tremendouns power supply, technologically may be better then "300" and its bass control is iron clad, no question here. With LA-300 I have similar bass, may be not as tight but somewhat richer and more accurate and I prefer it again (very slightly) by Joule-Electra. This preamp drives my Spectrons amps and B&W 802N speakers
Two points: for my ears the Cardas wire always show very good midrange but somewhat weak bass. I am not familiar with Jade Audio but all hi-end J-E preamps have David Elrod hook-up wire and I listen with David's interconnects which clearly add to the synergy.
Secondly, if you prefer XLR and very powerful power supply then you should compare REX not with "300" but with LA-450ME. Its power supply contains three times more energy then LA-300 and in separate chassis( and while its less important REX and 450 cost about the same while 300 is about 50% cheaper....)
To say that you made poor choice with REX - nobody will.
Congratulation!