dpac996;173821 Wrote: > I built, tested, and listened to the SB3 with a very high quality linear > power supply based on LT1084, adjusted to exactly 5 volts. Xfrmr was > split bobbin, capable of RMs current far exceeding worst case from SB3. > Total umbilical wire length was about 2 feet. The rest of supply > consisted of 5 6800 10v high quality Elna caps for a total of 34,000 > ufd of capacitance. The diode bridge was constructed of high current > schottky types, and the final output was bypassed with a high quality > film cap. Not that this is the ideal place for a bypass cap, but there > it is. > > The entire thing is encapsulated in a sturdy brushed aluminum case. > There is barely any noticable hum when powering SB3 with ear right next > to case. Case barely warm...I tested it with dummy loads that drew over > an amp for exteneded periods. The supply is working as advertised. > > Been running for several days, powering the SB3. > > My system: > > SB3/Marantz SA8001 -> Acoustic Zen Ref Mat 2 RCA-> Audio Research > LS15-> Audience RCA -> Audio Research 100.2 -> Acoustic Zen speaker > cable -> Dynaudio Contour 1.8 MKII > > Room is acoustically treated and my system, in my opinion, is capable > of very high resolution/transparancy. > > 1st off, the Marantz SA8001 SACD player is superior across the board. I > was not shocked. I used this as my reference for my tests. > > I used my favorite Diana Krall and Steve Tyrell cd's, both ripped > EAC/FLAC. > > Stock SB3 -> overall very good sound, but definitely has that mid-fi > sonic character: compressed soundstage, restricted highs, a bit small > sounding, with an overall electronic haze. Not a slam to SB3, I am > comparing it to a pretty good CD player in a high res system. > I was hoping the linear would help the top end and create the > impression of a bigger stage... > > SB3 with linear: I can detect no positive difference. I tried with all > my songs of the above mentioned ripped cd's. Yes the old switcher was > removed. > > Maybe my ears are full of lead, but i'll be darned if I can actually > make out any improvement. In fact, and I plan to prove this by more > listening, I think it may actually sound worse with the linear power > supply. > > This was a welborne labs squeezebox upgrade supply in case your > wondering. > > A tad dissapointed...I am. > > I wish I had my hands on the schematic (i'm not going to crack the SB3 > case and reverse engineer it) but > i'm sure there is a reason for it. Could be that the switched mode > power suppy is a better match due to the digital section and its > dynamic current drain...
Wow thats a pricy power suppy to not have any noticable affects. I wonder if some more breakin time is required. I have had a eye on this supply and looking for some feedback. Hope some more burnin helps. Thanks -- Nick77 ------------------------------------------------------------------------ Nick77's Profile: http://forums.slimdevices.com/member.php?userid=9105 View this thread: http://forums.slimdevices.com/showthread.php?t=31758 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
