On Monday morning 3/15/21, I noticed my two channel stereo system’s LEDs were off when I walked through the living room at 11am. The P10’s outlet zone indicators were all red and there was a red “Short Circuit” message at the top of the display. The touch display was unresponsive when I tried to restart the outlet zones. The breaker panel on the rear of the unit is difficult to reach due to being partially blocked by a large monoblock amplifier. Unplugging/replugging the P10 allowed it to restart.
A review of PowerPlay data indicated that, at 9am, incoming THD jumped from the typical average 1% to close to 3.5% for the home theater P5 and to over 3.5% for the home theater and two channel P10s. All three regenerators also showed a voltage spike at 9am. Outgoing THD for all three regenerators is typically about 0.1%. At 9am, the two channel P10’s outgoing THD increased fro 0.1% to 0.2%.
The two channel system is served by three dedicated 20 amp AC circuits. Each 20 amp circuit is terminated with a PS Audio Soloist SE in-wall passive power conditioner. One dedicated 20 amp AC circuit feeds the P10. Both monoblock power amplifiers have their own dedicated 20 amp AC circuits.
The P10 in the two channel system only runs the preamplifier, digital source components, Ethernet switches and linear power supplies.
The P5 and the P10 in the home theater system are each served by a dedicated 20 amp AC circuit. Each 20 amp circuit is terminated with a PS Audio Soloist SE in-wall passive power conditioner.
The last time I saw a significant increase in incoming power line THD was in January 2009. The Power Plant Premier in use at that time showed incoming THD of 7.7%! Via emails to the power company, I was informed that the cause of the higher THD was the substation that normally feeds my neighborhood had been taken offline for maintenance. We were being served by a different substation in the interim. When we were switched back to our normal substation, THD levels went back to normal. I assume there is a similar reason for this recent occurrence of higher power line THD.
The 20 amp breaker that serves the two channel system P10 is the 15th breaker on leg 1 of the breaker panel. The 20 amp breakers that serve the left and right monoblock amplifiers are the 14th and 15th breakers of leg 2 of the breaker panel. The 20 amp breakers that serve the home theater P5 and P10 are the 16th and 17th breakers of leg 2 of the breaker panel.
Figure 1. Home theater P5 THD increase.
Figure 2. Home theater P5 voltage spike.
Figure 3. Home theater P10 THD increase.
Figure 4. Home theater P10 voltage spike.
Figure 5. Two channel system P10 THD increase.
Figure 6.Two channel system P10 voltage spike.
Figure 7. Office system P10 THD. All functions normal. THD typically ranges from 2% - 2.5%.