The R&D target of RED acquires totally new from TRUTHEAR, based on the original excellent objective index of ZERO, the nonlinear distortion of RED is further optimized at higher sound pressure level (>94dB), and its frequency response target curve has bass amplitude response characteristics similar to the public preference curve, while the target curve of CRINACLE IEF_ Neutral is adopted in the frequency band above 1000Hz.
eBay