EMF blockers

I'm also evaluating EMF blockers.  I have two critical needs.  I have a active room mode canceling speaker now placed in a strategic hallway corner.  It reduces some low bass modes significantly, and especially reducing booming in the hallway and bedrooms.  But when I turn on the light in the guest bedroom, it makes a huge pop on the speaker.  The light is also a fan which might have something to do with it.  I bought an EMF reducing power strip that eliminates the problem.  The only other measure that was useful was an isolation transformer.  But the isolation transformer made a continuous humming not good for the bedrooms.  But I don't like the long cord on the EMF reducing strip and can't find one with shorter or no cord, though I have one like that somewhere.

Also when I flip the switch on the transformer based Tensor lamp near the turntable I also get a huge pop on my stereo if I am playing phono or any analog source.  To reduce that I plug the Tensor lamp into a separate strip which plugs into one of the 3 strips my two racks use.  It would be better on a separate circuit but that is very hard to arrange.  If I plug a "quiet lines" device (by Audioquest I think) it reduces the pop a bit more.  That was what I originally bought the latest EMF blocking strip for but thought I'd try it on the room mode cancelling speaker first and haven't yet tested on the lamp.

Meanwhile I also bought a Greenwave AC noise meter for $135.  This is similar to but better than my Audioquest Noise Sniffer because it has an unambiguous digital readout and there is no "sweep" control to confuse matters.  Already I've looked at a few circuits and things.  My big Panamax 1500 indeed reduces all the noise of all my line level components by about half or third as on other circuits in the house.  But meanwhile, that circuit itself is by 3x the noisiest in the house, and, IIRC, that was also true before anything was plugged into it.  It's a dedicated circuit the electricians installed a few years ago.  I'm thinking I should have them check it out.  Perhaps if the circuit were quieter, the panamax output would be quieter still.

I couldn't find any new reasonably priced plug-in EMF filter/blockers, except for Greenwave units, so I bought 2 of them for $30 each.  They are sold on the basis that you need to clean up your household power for personal heath, and they want you to buy dozens of them, for every circuit or even outlet in the house.

A company named Cleansweep does make some pass through filters but they are not small wallplug types but boxes that must be plugged into wall with a cord, and they all look a lot more expensive than $30.