For all of you who clearly didn't read my initial comment:
"I was "highly" sceptical that a 1mm strip of foil could make the sound any better so really did go into this with a closed mind."
I then said:
"I'm going to have to be absolutely certain that the Rainbow foil is producing this improvement and not my imagination so it will be a few days before I fully review it."
I conducted a test this afternoon based on the following, it may not be highly scientific and is open to critisism but so be it:
I burnt 2 copies of a track I know very well....... "Ocean club" from the Yello "Baby" album.
I burnt them using NERO 5.5 using the same type of CDR from the same batch and at a speed of 4X to ensure the copies were as accurate as possible.
I labelled one disc Rainbow 1 and the other Rainbow 2:
Rainbow 1 was "untreated" and Rainbow 2 was treated with 2 x 1mm strips of Rainbow foil.
My CD player had been warming up for 48 hours and my headphone amp is left constantly powered up so the equipment was fully warmed up before this test. I also looped a CD (not one of the rainbow discs) and let the headphones play for 1 hour before the comparitive audition just to ensure they were listened to from cold.
Here is the perverse part
I got an assistant to to pull up a chair next to the CD player armed with the 2 CD's... (he hadn't a clue about the rainbow foil by the way, I had told him I wanted to see if I could detect a difference in sound with CD's burnt at different speeds
I positioned my chair facing away from him and the CD player and asked to him to play a track from an independent CD so he could fix a volume level I was comfortable with.
He was armed with a pen and paper and was instructed to write down any comments I had after each listen.... ie "better" "not as good" etc. I also asked him to mix them up... ie: not play them alternately.. disc 1 followed by disc 2 back to 1 then to 2 etc. but to occasionally play the same disc twice but to open the CD drawer so it wasn't obvious he was doing this.
The test commenced and the first 10 minutes or so I couldn't differentiate any change whatsoever...... all three tracks that had been played all sounded the same until track 4 which sounded decidedly more defined in the bass.... easier to follow with a much raspier sounding trumpet and the finger "clicks" were very real sounding. Track 5 went the same as track 4..... definitely nicer sounding than tracks one two and three. Track 6 sounded as though a veil had been thrown over the CD lazer but, having said that it, was easier to listen to than track 4 and 5 though nowhere as exciting and analytical.... more musical maybe.
Track 7 went back to "open and analytical" and the bass again became easier to follow.... track 8 sounded the same as track 7.... track 9 throwing that same rose tinted veil over the proceedings and track 10 going back to analytical and open.
Ok, after 40 minutes of this and 10 identical tracks from 2 different discs being fired into my ears I was ready for the results and here they are as they were recorded by my assistant and the CD revealed in brackets:
Track one: "sounds good" (rainbow 2)
Track two: "sounds the same" (rainbow 2)
Track three: "same again" (rainbow 2)
Track four: "much more defined, easier to follow" (Rainbow 1)
Track five: "same as the last one analytical" (Rainbow 1)
Track six: "slightly veiled yet musical" (Rainbow 2)
Track seven: "definitely more open and airy" (Rainbow 1)
Track Eight: "that's the same track again (laugh) " (Rainbow 1)
Track nine: "that's the other disc it's veiled" (Rainbow 2)
Track ten: "ok lets call it a day that's the one I like" (Rainbow1)
When I looked at the results, fully expecting the tracks that sounded open, analytical and detailed to be rainbow 2 and found they were the untreated disc I was pretty gobsmacked!
I did a quick AB blind with assistant listening but he reckoned they all sounded the same so that wasn't a lot of help but all credit to the guy the only music he listens to is from a radio at work and he looked undecidedly uncomfortable sitting there
I cannot really form an opinion from this test but It's possible the rainbow foil works but makes the sound more musical throwing a rose tinted veil over the sound and less analytical sounding (I prefer analytical) than an untreated disc. It could also be a variation in the quality of the CDR's I used ....... etc. etc. there was a difference but I prefered the untreated copy in this pretty string and sellotape test.
I know there are plenty of head-fiers awaiting a free sample of Rainbow foil and maybe they can conduct a more comprehensive AB comparison....
EDIT: The shpongle treated disc still sounds better than the untreated disc
Maybe they are from 2 different pressing plants (both original recordings) and I should swap the rainbow foil over.
A note for all you who mentioned the word "gullible" etc. There's a difference being open minded and trying something for free and learning stuff rather than diving in and buying into snake oil just on the say so of someone else........ use your ears then decide.