Audio Engineering

10 100 1 K 10 K 50 K

6800/100 V 40 W/8Ω

3 dB 2.9 Hz

0.050

0.010

0.001

0.005

Audio precision power AMP THD  N(%) vs Freq.(Hz) 01 Dec. 95 20:15:52

Ap

Figure 10.6 : The extra distortion generated by an 6800- μ F electrolytic delivering 40 W into
8 Ω. Distortion rises as frequency falls, as for the small-signal case, but at this current level
there is also added distortion in the midband.

10 100 1 K 10 K 50 K

0.050

0.010

0.001

0.0005

Audio precision aplast$$ THD  N(%) vs Freq.(Hz) 14 Aug. 96 19:50:19

Ap

Figure 10.7 : Distortion with and without a very large output capacitor, the BHC Aerovox

100,000 μ F/40 V (40 watts/8 Ω ). Capacitor distortion is eliminated.