RNLA7239 (E) FMR Audio New purchase One owner Good working condition -- The following is an explanation -- A significant sound upgrade has been achieved by upgrading the op-amps of the FMR Audio RNLA7239. While retaining the unique punch and presence of the RNLA's vintage sound, the power is greatly increased, and a more prominent presence is added, making it stand out in the mix. This is a powerful upgrade that allows you to enjoy a higher-grade RNLA sound. Differences from the original RNLA7239 Powerful and crisp sound that comes forward Wider soundstage, larger sound image Clearer and more distinct contours Ambience is not lost