昨天從一向品味甚高的大哥家搬回來一對揚聲器（俗稱音箱或音響喇叭），把家中的音樂品質大大升級了。
有時真的覺得自己很幸福，大哥住在家附近，又因為今年恰巧一起回家度暑假，聊到我最近聽了太多從台灣買回來的搖滾專輯，竟把從學生時代開始用了十幾年的音箱燒破了，大哥聽了，毫不猶豫的就把他省吃撿用才買的 Spica TC-60送給我了真是大方的令我感動，真不知該如何回報大哥一直以來對我的照顧。
一對揚聲器的學問有多大？我正拿了一堆CD's 準備再來操操我的放大器跟這對新玩具。 對於工作方面必須對類比系統仔細從新研究的我，先把stereophile的測試結果跟大家分享，改天再好好來分享我的心得。大家不妨先猜猜看我會從哪些CD's開始試聽？
想想，在這個討論人類知覺的城市，也許可以多談一些。
聲音，對人類不是只有大小聲，它跟光一樣都是有波性的能量。圖一是電阻抗（實線）和相位（虛線）的關係圖。
這些圖最重要的用意是在提醒大家，人的聽覺是非常細膩的。
改天若有辦法，可以把每一個圖形都用中文來解釋，大家請先多包涵。
Fig.1 Spica TC-60, electrical impedance (solid) and phase (dashed) (2 ohms/vertical div.).
Fig.2 Spica TC-60, acoustic crossover on listening axis at 50" corrected for microphone response, with nearfield woofer and port responses below 300Hz and 600Hz, respectively.
Fig.3 Spica TC-60, anechoic response on listening axis at 50" averaged across 30° horizontal window and corrected for microphone response, with complex sum of nearfield woofer and port responses below 300Hz.
Fig.4 Spica TC-60, horizontal response family at 50", normalized to response on listening axis, from back to front: differences in response 90°–5° off-axis on other side of baffle; reference response; differences in response 5°–90° off-axis on tweeter side of baffle.
Fig.5 Spica TC-60, vertical response family at 50", normalized to response on tweeter axis, from back to front: differences in response 45°–5° above reference axis; reference response; differences in response 5°–90° below reference axis.
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Fig.6 Spica TC-60, spatially averaged 1/3-octave response in JA's listening room.
Fig.7 Spica TC-60, impulse response on tweeter axis at 50" (5ms time window, 30kHz bandwidth).
Fig.8 Spica TC-60, step response on tweeter axis at 50" (5ms time window, 30kHz bandwidth).
Fig.9 Spica TC-60, excess phase on tweeter axis at 50" (0.147ms delay).
Fig.10 Spica TC-60, cumulative spectral-decay plot at 50" (0.01ms risetime).
Fig.11 Spica TC-60, cumulative spectral-decay plot of accelerometer output fastened to center of enclosure back panel. (MLS driving voltage to speaker, 7.55V; measurement bandwidth 2kHz.)
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