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Yes, i tryed to make all for the identical conditions (the same disc, earphones (Sony MDR-E808 from my RH-910), full charged battery etc.). It used to say that on R-900 sound has more elastic bass & clear highs. May be its wrong, but its so seemed to me.

Thanks a lot to MDX-400 for explaination. I have no more question about it.

Atrac3+ devices has no ATRAC1 write capabilities without SonicStage (at least RH10/RH910). I heared that RH1 has this capability, but i don`t know if it doesn`t make the same "magic" with SP, like SonicStage? But the question is: 1.) Does old devices (Atrac 4.5) writes True-SP more correctly, than the newer one ATRAC3 devices (NET-MD, but not Hi-MD)? 2.) Does Hi-MD player playbacks correctly (without skiping sectors) the file, written on the old (ATRAC 4.5) devices?

Please read the topic attentively. I DON`T COMPARE SP with HI-SP. I compare SP with SP, but playback on different units.

Is it possible to write on MD (SP or LP) without SonicStage? Yes it writes on MD-media, but not in MD format. It writes only in Hi-SP and Hi-LP. If You need to make an MD recording - You must use SonicStage. Just open the manual for RH910. SP on NET-MD units has another quality, than on ATRAC1 v4.5 one. Yes ATRAC3 units write SP, yes it is the same bitrate, but the sound is poor. Could anybody make some Adobe Audition or Soundforge sonograms of SP files, written on different units? Then we will compare the graphics, and will see the truth. Maybe I mistake, maybe not? The comparation must be objective, isn`t so? I do not compare SP with Hi-SP. I compare MD-SP written on different units, and asked why does SP written on the old unit sounds better than, then the same disk played on the modern unit? Modern unit skips some bits, am I right?

May be I mistake, but information about Sonicstage`s SP-fake is true. SS is really converts sound to LP2 with adding additional false "zero-sectors". If I will have possibility to extract the Atrac 4.5 audiofile to the computer, then I will compare the Soundforge`s sonogramms. Certanly, if You will play the SP file, written on RH10, its really wlii play better on the new model. But, if You will make recordings on Atrac 4.5 unit, then You will hear the differencies. The N10 is not ATRAC 4.5 unit: it has Net-MD`s ATRAC3. Just try to find a little older model.

Thanks to all! I just found the answer. In short: Atrac3+ devices has no ATRAC1 write capabilities. If You want to write an SP, You must use SonicStage. Tracks are converted by computer and transfered to portable like a data. It means, that when portable is switched to PC, it doesn`t understand what does it writes. It writes all kind of files, which are converted and ordered by SonicStage. But, SonicStage converts all media files only for ATRAC3 compartible units. Have You seen the note "Transfers the file in SP mode for compartibility with "non-MDLP" devices"? SonicStage converts all files to LP ONLY! But for compartibility with "non-MDLP" it puts an false-data intervals in file and makes it larger. Also the ATRAC3+ unit, when plaing TRUE-SP file thinks, that it is emulation, and skips noted above intervals. For experiment i wrote an SP-track and an LP-track by SonicStage. I was sad then I have`t find in listening any kind of differences in they. So, conclusion: If You want to listen a full-range good SP, You must write it on the on ATRAC 4.5 unit, and listen it on the same one. If You are not agree, then just try it.

Thank You for replies, but I must note, that I compareed with RH910 the R900, but not RH900. R900 is the first Sony MDLP player and its 4-5 years old and uses ATRAC v4.5 (optical in)/ATRAC3 (line & mic). Tested minidisc was recorded on MZ-R70 (ATRAC 4.5) via optical line in from notebook. The same disc sounds better on the old portable, than on the new model. May be ATRAC3+ DSP chip is a progress in compression, but a regress in soung quality? Why people still like old MD decks? May be there is something in its sound? Now I like to compare my RH910 with an old ATRAC MD deck.

Some time ago I had an MZ-R70 (ATRAC v4.5), and its sound was an excellent for me. Later R70 was broken, and I bought an RH910 (ATRAC3+). I was pleasured by its capabilities and pure sound, but a week ago my girlfriend bought a used R900. After listening, I made a very strange conclusion: the same SP disk, played on R900 sounds better, than on RH910. Why? Maybe a newer model have a simpliest audio chips than old good R900? Or maybe Hi-SP models does not support the reading of SP so how it must be read?