Spica TC-60 Crossover and Schematics |
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The TC-60 was the last Spica design and the only speaker launched after the Parasound acquisition. While both a 6 ohm and 8 ohm versions of the literature exist, this was only a change in the literature not in the design.
Few electrolytic capacitors were used, which is good as the metal film capacitors are more reliable and considered to be sonically cleaner. Electrolytic capacitors are frequently used where larger values are needed because of their lower price and smaller size. Unfortunately electrolytics are prone to failure with age. See: Upgrading/Repairing Crossovers and Service Codes
TC-60 Crossover Components
All resistors are 5W metal films. Electrolytics are 50V Bennic Caps, film types are 100V-250V depending on the value.
Capacitors
1- 2 uf
1 - 2.2 uf
2 - 22 uf
4 - 5.6 uf
Resistors
1 - 2.0 ohm
1 - 2.2 ohm
1 - 2.4 ohm
1 - 6.8 ohm
1 - 7.4 ohm
1 - 7.5 ohm
Inductors
1 – .28 mH
1 – .68 mH
1 – 1.10 mH
1 – 2.07 mH
Crossover component values were determined by the service codes of the woofer. The values are listed here will most likely not match your values.
The schematics refer to "1st" and "after". "1st" means first production run of 100 pairs, and "after" means all production after that, and represents most TC-60s made. According to John Bau they 20uF electrolytic capacitors (it's a non-standard value) were special ordered for the TC-60 production and they didn't show up in time for the first 100 pairs that were produced. This meant that the first hundred were built with 22uF electrolytic capacitors and the related components were adjusted to achieve the correct total value.
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TC-60 Crossover
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TC-60 Schematic
(Bau Sketch, with Notes )
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TC-60 Board Layout
(Bau Sketch)
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