Well this link will start many arguments!

@roadcykler "...Seems rather like a religion..."

Not at all. The issue is that characterizing reproduced sound is so incredibly complex with so many variables, that folks in this pursuit that think they are being science based by measuring a few variables are grossly oversimplifying the problem then drawing conclusions. In very complex environments, observation (as in listening and hearing) is the correct scientific mode until all the variables are understood and a complete and verified model is created (there is not, and this is super computer terrain. Not identifying a few variables and using them to explain or predict the entire system. Musical reproduction and sonic characterization is just way too complex with too many variables for that to be a pragmatic value. Listening and training your ears, calibrating your ears to natural sound and using those as your instruments is what is useful and appropriate. 

Just a note, this is not creating a simple tone at a certain frequency. It is nearly infinite variation in tones and beats where different frequencies interact through harmonics. It is very nearly infinitely complex. 

The so called ‘search for truth’ is exhausting, confounding, fraught with human frailties and will eventually rob you of valuable time and too much capital.  
Unless… unless you make it fun, casting off expectations of others and simply play the game by your own rules.  Your system, your way.  All that really matters.

I DO swear by cable lifters------they make vacuuming so much easier!

@willyht vacuum cleaning on a 1 to 10

l have discovered the efficiency of vacuum cleaners have severely diminished since all those cordless (no problem with what cable there) models have replaced the hard wired 1000W ones. More power in those olden days rewarded by better quality suckers.

Can anyone recommend a good cordless vacuum cleaner that does not loose suction after a few years? I am a self confessed fetishised fan for those long hose extensions. To get right in there with the spaghetti jungle of cables and hi-fi regalia appendages. 

Oh by the way, returning on track to the debate. I agree with the head/brain burn in syndrome. Sometimes, some people are just fooling themselves after an expensive upgrade, to justify the money that has been sucked out of their vaults.

New speakers--better bass. New amps--better bass. New preamp--better bass. New turntable--better bass. New cartridge--better bass. New speaker cables--better bass. New power cords--better bass. New power distributor--better bass. Better recording--better bass. New subwoofer? I'm hoping for better bass.