mohler@druxu.UUCP (MohlerDS) (04/25/85)
I have several suggestions regarding a re-test, any or all might make for additional data or results. 1. In an A/B blind comparison efforts should be made to not allow one listener to influence another (for instannce head nodding etc.). What ever means is used to allert the listener that a switch Was occured should be non-verbal. 2. Several similar tests have employed not just music but test discs with white or pink noise on them. This does nothing for audibility using music, however it may yield a clue to audibility of any differences. 3. You might try to borrow as good a headphone as you can for the re-test, something like a Stax: pro, lambda, sigma, srx-3 or audio-technica ath-9, ath-7 might be appropriate. 4. Listeners should be allowed to sit in the "sweet spot", walk aound or use any means they care to employ to try to discerne differences. 5. Try be careful of absolute system phase: i.e. an even number or no inversions from the source to the transducer. Audio's equipment directory lists some information on individual components. 6. If you can gather them, you might try using players with 16 bit non and over-sampled, 14 bit non and over-sampled D-A converter - filter topologies. 7. Double wide cats should make up for any meowing with the damping increase that a double wide cat provides. I hope some of these suggestions prove useful. David S. Mohler AT&T -ISL @ Denver !druxu!mohler