由 apia978 發表於 週六 8月 22, 2009 10:11 pm
順便列一下可更換OP的清單好了:
NE5534 : Classic, legendary, lowest cost, most widely used in hi-end audio. Works surprisingly great in SuperMacro which is designed without these dinosaurs in mind. Very clear and open when output bypassed and more airy under class-A.
AD744 : Good clarity, not the lowest noise though.
AD8610 : Smooth, detailed, lively and flat. Very battery friendly and reasonable price. Very bassy and airy under class-A.
OPA627/637 : Natural, open, transparent, thick lows, sparkling highs and not so bright middle range. 637 has no compensation and thus faster and slightly better benchmarks. Everything's good except high price.
OPA227/228 : Blackly and blankly quiet, milky liquidly, rich, bassy and good image, no any harshness. Low cost but truly hi-end. Not FET, but a lot more tube-alike. 228 has no compensation and thus faster and slightly better benchmarks. Perfect unless you prefer something more bright and less heavy.
AD829 : Deep and powerful bass, very low noise.
OPA604 : Most accurate imaging and deepest staging. Kind of grainy without class-A, but might be just that raw passion you've been looking for. Just rough enough or it'll be harsh.
LT1115 : Very low noise and distortion, designed exclusively for audio. Extraordinary highs loved by senior audiophiles, but bright and cold to others.
LT1028/1128 : Almost the same as above.
LM6171 : Really an ideal buffer - super fast and high current output. Like the NE5532/4, one of audiophiles' favorite mod replacements.
OPA132/134 : Low cost, easy to work well in almost all applications. Too easy for SuperMacro.
AD797 : Super low voltage noise, optimized for low input impedance (600 ohm or lower). OPA227, higher voltage noise but lower current noise, is better for applications like headphone amps.
AD825 : A low cost offering from AD.