Philips TDA1521A Datasheet page 9

Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
Fig.4 Output power as a function of supply voltage; symmetrical supply; R = 8 ; f = 1 kHz.
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Fig.5 Distortion as a function of frequency; symmetrical supply; V = 12 V; R = 8 ; P = 3 W.
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