Speaker Clarifiers?

Things you should not spend money on until after you've hired an acoustic consultant.

... or had your ears checked by a good audiologist

It is my belief that cables, pucks, and clarifiers are popular because they are easy to experiment with and easy to get into the house without raising suspicions in one’s mate that a lot of money is being spent for dubious ends.
On the other hand, for sure rewards in better sound, I’d suggest addressing room acoustics with known science and engineering.

As effective as copper wristbands for treating arthritis of the hands! Another example of Flat Earth Science to befuddle the gullible!

Faint heart ne’er won fair maiden. 💃

Very slick website, love the pseudo science. Great value too by the look of it.

Adding extra unexplained circuitry is always a good idea. Especially if it costs more than a decent loudspeaker. 

Far better than mere good double glazing and sound proofing. Or a comfortable chair/ sofa. Or hundreds of $$$ worth of music.

I'm sure loudspeaker manufacturers will be queuing up to endorse these honest tried and tested products once they realise his effective they are. The reviews seem really convincing too.

Obviously.

Now will someone pass the snake oil antidote please?