nick_charles
Headphoneus Supremus
- Joined
- Feb 26, 2008
- Posts
- 3,180
- Likes
- 336
Okay, this is hardly scientifically rigorous, but here goes. A while back I was discussing jitter and discovered the worst measured jitter for any audio device, it was for the Pansonic SL220 portable CD player with anti-shock enabled and it was measured at -38db. A good 70db worse than a half decent well anything modern really.
I have tried for several months to get one of this babies but to no avail. However I do have an old Technics SL-XP240 (Panasonic/Technics are just 2 labels of Matsush1ta) and the XP240 is , as far as I can tell (near) identical to the 220 , it is the same vintage i.e mid/late 1990s, it has the same anti-shock and the same specs viz noise and output level. Also after extensive searching it is clear that anti-shock on **any** portable leads to massive jitter sidebands. So while I cannot prove that my Technics is totally identical to the Panasonic I can totally guarantee that it's jitter figure will certainly be *no better than* - 55db i.e at least 65db worse than anything current, excepting the Oppo 970 of course (where the margin is a mere 35db) .
So I set my Technics up with Anti-shock enabled and also took a Wav of the same test track (Saint-Saens Piano Concerto No 1 Mvt 1) to be played back in FooBar (using an external soundcard TBAAM). I carefully set the volumes on the PC and CD player to the same and connected them to a switch box and synchronized the tracks. The amp was a Nikko TRM-210 and the headphones are AKG K240S.
I then did some non blind listening switching between the two, I did this several times. Frankly I could not tell them apart. By a bizarre coincidence I have two identical copies of the CD in question so I can also test the portable against a proper CD player this weekend.
Now I cannot of course say what the jitter levels on my Sound card are which makes conclusions tentative, what I can say is that through an external amp and decent headphones a portable CD player that has frankly apalling jitter figures is eminently listenable. If ps of jitter are really audible then this unit would be utterly unlistenable , not just meh. At the weekend I will wire it up to my proper headphone rig (M^3 and AT700s/HD580s) and see how it does...
I have tried for several months to get one of this babies but to no avail. However I do have an old Technics SL-XP240 (Panasonic/Technics are just 2 labels of Matsush1ta) and the XP240 is , as far as I can tell (near) identical to the 220 , it is the same vintage i.e mid/late 1990s, it has the same anti-shock and the same specs viz noise and output level. Also after extensive searching it is clear that anti-shock on **any** portable leads to massive jitter sidebands. So while I cannot prove that my Technics is totally identical to the Panasonic I can totally guarantee that it's jitter figure will certainly be *no better than* - 55db i.e at least 65db worse than anything current, excepting the Oppo 970 of course (where the margin is a mere 35db) .
So I set my Technics up with Anti-shock enabled and also took a Wav of the same test track (Saint-Saens Piano Concerto No 1 Mvt 1) to be played back in FooBar (using an external soundcard TBAAM). I carefully set the volumes on the PC and CD player to the same and connected them to a switch box and synchronized the tracks. The amp was a Nikko TRM-210 and the headphones are AKG K240S.
I then did some non blind listening switching between the two, I did this several times. Frankly I could not tell them apart. By a bizarre coincidence I have two identical copies of the CD in question so I can also test the portable against a proper CD player this weekend.
Now I cannot of course say what the jitter levels on my Sound card are which makes conclusions tentative, what I can say is that through an external amp and decent headphones a portable CD player that has frankly apalling jitter figures is eminently listenable. If ps of jitter are really audible then this unit would be utterly unlistenable , not just meh. At the weekend I will wire it up to my proper headphone rig (M^3 and AT700s/HD580s) and see how it does...