- Joined
- Apr 6, 2001
- Location
- Mount Vernon, WA
John G said:In a lot of these magazines and such, you'll see reviews and articles about amplifiers. How they compare, which sounds better, etc... They will say with absolute certainty that they hear some special quality in one amp that isn't the same in the other. Warm midrange, smooth highs, fuller bass, sparkling detail, and all sorts of adjectives that people would normally use to describe food... All in an attempt to say that the amp simply has a sonic character that causes it to sound different than the other amp at the same volume and neither amp distorting. And, these are usually extremely high quality amps with ruler flat response, very low distortion, noise free, etc...great specs.
I have heard those sorts of differences in amps myself, although I would have been hard pressed to put descriptive terms on them like they do. I probably would have just said, "This one creates a slightly more believable auditory illusion." And, maybe try to pinpoint why.
But, how do you eliminate psychological effects from testing amps? With a double blind test.
There's a guy named Richard Clark...he has a lot of education with audio stuff and science and physics in general. Has made a lot of money for himself, owns a company that makes CD's, and a few other ventures. Has some patents on various audio stuff that he developed. Someone introduced double blind testing to him years ago and he learned that with amps, as long as they meet certain standards (basically a decent, modern amp without serious design flaws) and are used within their linear operating range (not into distortion) that people cannot reliably tell the difference between two amps with their sense of hearing. He brought it up to the community...some accepted it, most did not. He ended up refining his test and turning it into a $10,000 challenge. If anyone can tell the difference between any two amps that meet some very basic requirements in his double blind test, they win $10,000 of his own money. If they lose, nothing happens other than a possible education on amps. So far, thousands have taken his challenge...no one has won.
Basically, in that challenge, people get to pick what amps, what speakers, what music, have control of the volume the whole time, and can switch between amp A, amp B, and an unknown that is either A or B at will. Their task it to try to determine if the unknown is A or B, then rinse and repeat. They are unaware which amp is actually playing, and the person administering the test is also unaware since the unknown is randomly generated by a computer. (That's the double blind part.) People often believe they hear a difference while taking the test and are getting it right every time...expect to get a perfect score, then end up with results as though they had flipped a coin each time. Some people realize part way through the test that all three options sound the same once they can only rely on their sense of hearing.
So... In this contest we get to choose the amp, speakers (headphones?), AND music?
How is that a fair contest and/or test? Someone could just pick a tube amp and a solid state amp and win Its very easy to tell the difference in the sound between those.
Or just pick amps that are not in the same class. Ive heard a $3,800 amp before (Headroom Blockhead) and it beats the crap out of my headroom MOH. I agree that most of those review people are full of **** but you can tell a difference between different classes of amps. Granted there is more of a difference in low-mid class than mid-high but its still easy to tell the difference.
I disagree with the fact that as long as certain components meet requirements you cant tell the difference.
Example: My cables for the HD650's. Ive tried the ZuMobius and the silverdragon HD650 cables (one is copper/silver, the latter is all silver) and there is a most noteable difference in them. Plus like I said about the amps there is a most noteable difference between the type of amp (Tube/solid state) and its class (low-mid-high).