What is the frequency response of the Spica TC-50?
The frequency response is approximately 60 Hz to 17 kHz at -3 dB.
What is the power handling capacity of the Spica TC-50?
The speaker can handle 50 watts of continuous power and 100 watts of peak power.
What is the nominal impedance, and how low can the impedance drop?
The nominal impedance is 4 ohms, with a minimum of approximately 3.6 ohms around 4 kHz.
How should the crossover on the Spica TC-50 be operated or adjusted?
The crossover is fixed internally, with a fourth-order (24 dB/oct) low-pass Bessel filter for the woofer and a first-order (6 dB/oct) high-pass filter for the tweeter; not intended for user adjustment.
Which amplifiers are compatible with the TC-50, given its impedance and efficiency?
Amplifiers with 25 to 100 watts RMS at 4 ohms deliver good performance; lower power ratings may be insufficient due to low sensitivity (~84 dB/W/m).
What is the best way to position the TC-50 speakers?
Place them on stands, away from the corners, with the front baffle positioned so that the woofer and tweeter are time-aligned; experiment with toe-in angles for optimal imaging.
Is the “TC-50i” version different from the original “TC-50,” and if so, how?
Yes: Starting in January 1988, the TC-50i was manufactured with different woofers, a different tweeter, a modified crossover, and altered felt surrounds around the tweeter to improve efficiency and component availability.
What does “sealed box” mean, and what effect does it have on low frequencies?
“Sealed box” refers to a closed enclosure without ports; this limits low-frequency output below ~60 Hz, creating a tighter bass with less resonance.
What connectors and wiring are needed to connect the TC-50?
Use conventional speaker wires while maintaining tweeter and woofer polarity; the positive (+) terminals of both drivers must be in phase.
How does it work with subwoofers or speakers in larger setups?
The TC-50 can be paired with a subwoofer to extend the bass range, especially if significant output below 60 Hz is desired; crossovers and subwoofer transition settings can help avoid overlap or dips.
