1) the Omega upgrade (18 ohm Alnico magnet midrange and tweeter drivers, and new constantly charged crossover for the tweeter) for my series 3 Avantgarde Duos raised sensitivity from 103dB to 107dB and gave even more unforced detail and musical soul. Somehow, through alchemy I do not understand, it also improved the bass performance - more filigree and better match to the mids in the upper bass/lower mids power region.
2) AMR CD-77.1 CD player with isosynchronous USB DAC and switched non-oversampling filter options for the TDA1541 chipset. Bombproof build quality, superb attention to detail (for example, the shipping case is better made than some "high end" components I've had in the past), NOS tube output stage and the most detailed yet musical presentation I've heard from any digital source - truly a CDP for analog lovers.
3) Cary SLP-05 line stage, with my fave NOS Sylvania 6SN7s. A heavenly meeting between soul and accuracy, at a reasonable price.
2) AMR CD-77.1 CD player with isosynchronous USB DAC and switched non-oversampling filter options for the TDA1541 chipset. Bombproof build quality, superb attention to detail (for example, the shipping case is better made than some "high end" components I've had in the past), NOS tube output stage and the most detailed yet musical presentation I've heard from any digital source - truly a CDP for analog lovers.
3) Cary SLP-05 line stage, with my fave NOS Sylvania 6SN7s. A heavenly meeting between soul and accuracy, at a reasonable price.