NewBuyer;369048 Wrote: > Is an external buffer essentially a separate output-stage-in-a-box? You could think of it like that, but the catch is, that it doesn't remove, or alter the previous devices output stage. NewBuyer;369048 Wrote: > Is it really a voltage amplifier / preamp without a volume control? > Does the buffer's high input Z and 6db gain, allow the previous > device's output stage to run in a more optimum range with less > distortion? The only way a buffer can change the range that the previous stage is running in, is by removing some of the current demands. As I've mentioned earlier, the only time this is an issue, is if you're dealing with a device with an abnormally low input impedance, or if your source has an abnormally high output impedance. You mention liking the sound of the Burson driving a passive pre-amp, that's probably because your passive preamp has a fairly low input impedance. By adding the Burson, you've converted it to an active preamp!
One of the more legitimate criticisms raised against the output stages of most op-amps, is that they're running in, or close to, class 'B'. Designers of discrete circuits, like Burson and Bryston, are quick to point out that their output stages are running in class 'A', and should have lower distortion. While this is a legitimate argument, it in no way validates the idea of using a buffer! After all, the op-amp output stage is still there! Adding a second output stage cannot undo any problems introduced by the first! I've said it before, and I'll say it again, if you want great sound, simplify your audio chain, don't keep adding things to it. -- DCtoDaylight Audiophile wish list: Zero Distortion, Infinite Signal to Noise Ratio, and a Bandwidth from DC to Daylight ------------------------------------------------------------------------ DCtoDaylight's Profile: http://forums.slimdevices.com/member.php?userid=7284 View this thread: http://forums.slimdevices.com/showthread.php?t=56068 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
