Stereophile天書40週年世界百大器材裏 第75名 : SPICA TC-50 喇叭筆記

 SPICA TC-50 喇叭筆記

最近購得的SPICA TC-50,這是最早的相位一致型的喇叭。

低音6.5吋 高40.5公分深29.5公分寬33.5公分

最早是在1983開發出來為美國的John Bau,2000後就不再見到這家傳奇喇叭的身影。所以市場上是見一對少一對,這樣狀況良好的喇叭已經很少見了。前一代是SC-50 1979年,TC-50約1983年推出,1988年TC-50i,後繼是TC-60喇叭 1994年。
(Stereophile天書40週年 評選世界百大器材裏的第75名 : Spica的 TC-50 喇叭)

Stereophile the Hot 100 Products, No. 75: Spica TC-50 loudspeaker。

引用
https://spicaspeakers.com/specifications/spica-tc-50-datasheet.php#gsc.tab=0

這裏說設計師 John Bau 突破了當時可用工具的極限,創造出卓越品質的超越時間的設計。

The TC-50 is a deceptively simple two-way loudspeaker based on a 6-1/2 inch acoustically suspended woofer and a 1 inch dome type tweeter. Its crossover network is truly state-of-the-art, in parts quality, circuit layout and, of course, design. The compact speaker is the result of exhaustive research and the latest technology in computer assisted optimization. Designer John Bau had indeed pushed the limits with tools available for the period, creating a time-aligned design with remarkable imaging qualities. Close tolerances were maintained during production and units were serialized to ensure a optimal left/right matching.

規格 Specifications:
    Released: 1983, est. 20,000 total sold (post) approx 7,500 TC-50's / 12,500 TC-50i
    Description: Two-way, stand-mounted loudspeaker.
    Drive-units: 1" soft-dome tweeter, 6.5" pulp-cone woofer.
    Low-frequency alignment: sealed-box Q=0.78.
    Crossover frequency: 2kHz.
    Crossover: high-pass slope, approximately first-order, 6dB/octave; low-pass slope, fourth-order,            24dB/octave, Bessel; both drivers connected with the same polarity.
    Frequency response: 60Hz-17kHz (-3dB).
    Sensitivity: 84dB/W/m.
    Nominal impedance: 4 ohms (3.6 ohms min. at 4kHz).
    Amplifier requirements: 25-100W.
    Maximum power handling: 50W continuous, 100W peak.
    Dimensions: 15.5" (394mm) H x 13" (330mm) W x 11.6" (295mm) D
    Weight: 20 lbs (9.07 kg) each.
    Price: $420/pair (1984) / $450/pair (1986-1988); $550/pair in oak or walnut

當年台幣跟美金匯率約1:40 所以當時這對喇叭在台灣的售價大約是2萬台幣左右。最後SPICA被Parasound於1993年收購。





引用
https://spicaspeakers.com/repair/tc-50-crossover.php#gsc.tab=0

1988年後出的TC50i是因為 Audax (FR) / Polydax (US) 單體停產後,必需出的調整。

年份表:


TC50的分音器及電路圖:




Type Qty TC-50 Schematic Qty TC-50i Schematic
Elect. Cap. 50V C1 4.7 ufd C1 same
Elect. Cap. 50V C2 4.7 ufd C2 same
Elect. Cap. 50V C8 4.7 ufd C8 same
Mylar 50V C3 0.22 ufd C3 0.1 ufd
Elect. Cap. 50V C4 33 ufd C4 40 ufd
Mylar 50V C5 0.33 ufd C5 0.22 ufd
Mylar 50V C6 0.33 ufd C6 0.22 ufd
Elect. Cap. 50V C7 3.1 ufd C7 same
Mylar 50V C9 0.1 ufd C9 0.22 ufd
Metal Film 1/2 watt R1 1 Ohm R1 2 Ohm
Metal Film 1/2 watt R2 1 Ohm R2 4.1 Ohm
Metal Film 1/2 watt R3 1 Ohm R3 2.7 Ohm
Inductor L1  1.02 mH  0.23 Ohm L1 same
Inductor L2  0.778 mH 0.23 Ohm L2 same
Inductor L3  0.353 mH 0.11 Ohm L3 same

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