Buzzing in Exactpower SP15

Howard, Every once in a while I experience the same with my EP. It's not audible through the system and has no affect on the music, it's just a physical/mechanical buzzing. And that's only on occassion.

I have discussed this with EP and they told me the cause may be due to DC offset on the lines. Soon, they will be releasing a small filter/correction device that is designed to be plugged into the same outlet as the EP. It will supposedly correct this condition. So obviously, it's not just us experiencing this problem.

Although, the EP does such an incredible job with everything else, I have learned to ignore it. Keep in mind, they are on the ground floor with these units. It seems that they are resolving any issues as they arise. I love my EP-15. And just to remind you of how much you love yours, unplug it, and go directly into the wall.

Suddenly the minor buzzing will become irrelevant.

My compliments to the boys at EP. They really did a great job with this unit.

BTW, The Exact Power units are being revised to correct this condition. The revision should be incorporated into the units being released later in the year. It seems the AC coupling portion of their AC correction circuit design is lacking the ability to compensate for extraneous amounts of DC offset present in the AC signal.

It does in fact compensate for root and residual DC offset, but it seems many of us (Thanks to our utility companies), are experiencing some very high levels of DC signal in our AC. Some way in excess of +/- 12v. Remember, the EP is designed to correct an AC power waveform. Although obviously, they are using DC signal to power the digital/reference frequency portion of their corrective circuit.

Hopefully any revisions or upgrades can be incorporated into our existing units. I'm gonna kinda' sit back, give them some time and let them do their homework. I'm sure that these units will just continue to improve. Hell, mine doesn't even have the digital filtered outlets. I'm using an outboard passive device to do that.

Mine is a very early unit (Nov.2002). So, just look at what they have done in the last year. After they get done tweaking, I will probably replace mine with their latest unit with all revisions incorporated. Possibly even the 20 amp (if they ever release it).

Stay in touch with your EP dealer for the availability of this little corrective device/filter. Hopefully it will resolve any issues. Ed.

Sugarbrie, when you really think about, as unfortunate as it may be, we are ALL having to solve the electrical utilities shortcomings!

It's a vicious little circle, isn't it?

Mghcanuck, The AC offset killer is only good for 10 amps. I really would not know where else to go until Exactpower releases their little correction unit. That will be good for 15 amps.

Although I won't tell you that the Offset Killer won't work. I have never tried it.

Maybe throw up a thread re: DC offset correction?