Pioneer SF-70
¥ 33,000 (around 1969)
Commentary
An electronic crossover network in which crossover points and slopes can be freely selected.
2-way and 3-way can be used by switching the switch.
The crossover frequency can be adjusted to 5 levels of high and low, and can be freely selected according to the speaker.
In addition, the slope can be selected in 3 stages at 4 positions.
It is equipped with a center channel output jack that mixes low range L and R, allowing 3D playback.
Model Rating
| Type | Electronic crossover network |
| Circuit system | NF Type Crossover 5-step switching 3-step slope switching 2-3-way switchable |
| Rated output voltage | 3.5V |
| Split band | For 2-3-way, Low, Mid High Each individual level can be adjusted |
| Total harmonic distortion factor | 0.3% or less |
| Constant loss | Within 2 dB |
| S/N | 85 dB or more |
| Input impedance | 100k Ω |
| Output impedance | 200 Ω or less |
| Crossover frequency | Low : 125, 250, 500, 700, 1000 Hz High : 1, 2, 4, 6, 8 kHz (5-step switching for each) |
| Cutoff characteristic | 6, 12, 18dB/oct. (Independently switchable) |
| Center channel output terminal | Impedance 4k Ω / 70 Hz |
| Gain | 0dB |
| Semiconductor used | Transistor : 20 Diode : 2 pcs |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 2W (rated) 6VA |
| External dimensions | Width 300x Height 115x Depth 254 mm |
| Weight | 4.1kg |