Yamaha ST15 Speaker Transformer
This device is a matching transformer that is used for the parallel connection of low impedance speakers to a high impedance type distribution power amplifier.
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This device has a capacity of 15 W, the line output of the power amplifier connected to the primary pole is assumed to be 100 V (using a 70 V line is also possible). The blue, yellow, orange and brown secondary cords each correspond to speakers whose nominal impedance is 8, 6, 4 and 2Ω, while the input impedance of the connected power amplifier is 670Ω.
TECHNICAL SPECIFICATIONS
| Capacity | 15 W Continuous |
| Frequency Response | 50 Hz–20 kHz |
| Total Harmonic Distortion | ≤ 1% (1 kHz, 15 W) |
| Insertion Loss | ≤ 1.5 dB |
| Dimensions (W × H × D) | 80 × 48 × 46 mm (3-1/8″ × 1-7/8″ × 1-13/16″) |
| Weight | 450 g (15.8 oz) |
