A way to improve Power Factor

wil

Well-Known Member
Jul 22, 2015
528
323
273
I recently installed a 6 gauge "home run" line from our main panel to a dedicated outlet for audio. Connected to this outlet is a Sound Application TT7 240v power distributor. My amp, server, dac and switch power supply are connected to the TT7 and my class d speaker amps are on dedicated wall outlets.

I rented a Fluke 345 to initially measure at the panel which phase would give the best power factor measurement. The PF measured .74 and .68 on the other, which is not good. After much head scratching, I finally realized this was probably due to a small water pump station serving our neighborhood. This pump station is served by the next transformer down from the transformer that feeds our house.

I did find, however, there is an easy way to get the PF back up into the .90's which is to add a resistive load to the circuit in the form of incandescent light bulbs. So I replaced the CFL bulbs with about 300 watts of incandescent to get a PF reading of .91. Along with the PF, this improves the measured Current THD and creates a smoother Current waveform.

In initial listening tests, the SQ benefit is subtle but noticeable primarily in the form a more expansive soundstage.
 

Steve Williams

Site Founder, Site Owner, Administrator
I recently installed a 6 gauge "home run" line from our main panel to a dedicated outlet for audio. Connected to this outlet is a Sound Application TT7 240v power distributor. My amp, server, dac and switch power supply are connected to the TT7 and my class d speaker amps are on dedicated wall outlets.

I rented a Fluke 345 to initially measure at the panel which phase would give the best power factor measurement. The PF measured .74 and .68 on the other, which is not good. After much head scratching, I finally realized this was probably due to a small water pump station serving our neighborhood. This pump station is served by the next transformer down from the transformer that feeds our house.

I did find, however, there is an easy way to get the PF back up into the .90's which is to add a resistive load to the circuit in the form of incandescent light bulbs. So I replaced the CFL bulbs with about 300 watts of incandescent to get a PF reading of .91. Along with the PF, this improves the measured Current THD and creates a smoother Current waveform.

In initial listening tests, the SQ benefit is subtle but noticeable primarily in the form a more expansive soundstage.
This sheds a whole new light on the importance of incandescent light bulbs :cool:
 

Mikem53

Well-Known Member
Oct 1, 2020
558
429
70
I recently installed a 6 gauge "home run" line from our main panel to a dedicated outlet for audio. Connected to this outlet is a Sound Application TT7 240v power distributor. My amp, server, dac and switch power supply are connected to the TT7 and my class d speaker amps are on dedicated wall outlets.

I rented a Fluke 345 to initially measure at the panel which phase would give the best power factor measurement. The PF measured .74 and .68 on the other, which is not good. After much head scratching, I finally realized this was probably due to a small water pump station serving our neighborhood. This pump station is served by the next transformer down from the transformer that feeds our house.

I did find, however, there is an easy way to get the PF back up into the .90's which is to add a resistive load to the circuit in the form of incandescent light bulbs. So I replaced the CFL bulbs with about 300 watts of incandescent to get a PF reading of .91. Along with the PF, this improves the measured Current THD and creates a smoother Current waveform.

In initial listening tests, the SQ benefit is subtle but noticeable primarily in the form a more expansive soundstage.
Is this because the two phases are out of balance, so one is robbing the other of power ? You’re just equaling it out .
Do issues like this exist on a single phase ? I have two 120 phases coming in, even though I only use one phase for audio , but both are loaded. A simple concept can be confusing ..
Thanks, glad you found an easy resistive solution!
 

ack

VIP/Donor & WBF Founding Member
May 6, 2010
6,724
1,102
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Boston, MA
BTW, the MIT power products also include circuits to correct the Power Factor
 

Mdp632

Well-Known Member
May 30, 2016
370
95
113
BTW, the MIT power products also include circuits to correct the Power Factor

Is this different than Shunyata's technologies?

As a Spectral owner did you ever own MIT power products prior to Shunyata?
 

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