I always found the UMR to be out in front (with many amps and pre-amps).
It would be better to get a CD with pink noise and play it for hours. They sell them on eBay. I'll look for a link and post it later.
Absolutely nothing happens to the capacitor by playing it when new.
Here is an email exchange with Michael Jantzen on the subject:
Hi Mr Jantzen,
A while back you were very kind and took the time to explain some facts for me on capacitor selection for my Acoustic Research 90 speakers. I thought you would be a great person to answer the following question: It's a long held belief by many in the audio world that capacitors need time to 'break-in' before they sound good or sound their best. I'm of the opinion that your ears 'break in' and nothing is happening to the capacitor. As a person involved in the manufacture of audio capacitors is there anything physical that happens to the capacitor that would cause it to change it's sonics or is it all about your ears becoming accustom to the new sound?
Thank you for your time, David
Thank you for your mail.
I will be happy to give you our opinions/views on audio related subjects.
Please do note that I cannot decide if something is myth or fact, but only tell you what we think, based on our years of experience.
We believe that if a capacitor is made with high quality materials and with the proper winding method and overall care with build quality, it will sound the same from day one and until it no longer performs as it should.
For drivers, it is a different story as there are moving parts like membranes, voice coils etc.
Like with a new car it needs to be driven for a while to get the full potential from the engine, gearbox and other main components, much the same with speaker drivers.
The mind is a very powerful thing and if you tell yourself that a capacitor will sound better or different after i.e. 100 hours of play, then I am sure that it will sound different.
I think listening to speakers is like smelling perfumes in a perfume store or going to a wine tasting.
At some point, you will need to clean your pallet, because you will have sensory overload and everything will taste, smell or sound the same or you will have convinced yourself that things are different, because your senses are too saturated to give you an honest answer.
I think that if you buy some nice and expensive capacitors, you should give them a listen.
Then go do something else for a good long time and clear your senses, then go listen again with a fresh mind.
There are a lot of clams, superstition and “magic” in the audio industry and we would like to think that we have a pragmatic “Scandinavian” approach to making audio related products.
We want our products to have a purpose and to be of high quality.
Yes, we do want our customers to have many choices and to offer new and exciting products, but we never launch a product until we are sure that it serves a technical purpose and that it has the quality and sound that is fitting for a Jantzen Audio product.
If someone can show me proof that a human ear can detect any difference for one of our Superior Z-Caps @ 1 hour of play and @ 100 hours of play, I will gladly change our view on the subject.
At Jantzen Audio we only care about what makes music sound better/different to the human ear.
We do not waste our time with things that are only improvements or changes on a theoretical level.
It would be like saying that we had created a dish using a very exotic spice at 5000$ per ounce, but no human can taste the difference if we add to in the dish or not.
Would you a restaurant the extra 5000$ for such a dish? J
I hope you can use my thoughts on the subject.
I wish you a nice day and a merry Christmas.