jaysung;237538 Wrote: > Hello, > I had a chat with my local dealer this morning. I explained that the tp > has nearly become the one and only audio source on my hifi and I would > subsequently not need the preamp integrated into my Marantz PM-11s1. > He said I would be basically right but... > He wanted to know how Transporter controls the output volume. He argued > that if it was digital turning it down to moderate levels would decrease > the resolution of the samples by 1bit per 6db approx since the integer > values of the samples would be decreased by digital volume controls. > Thus the difference between very loud and nearly inaudible would be > diminished and distortion would probably increase. . As a rule of thumb > 6db per bit makes sense to me since we have got an snr of approx. 96db > on 16bit samples. > If the volume control in Transporter was analogue on the other hand he > said removing the preamp with its analogue control of volume would be a > good idea to increase transparency. > I have not tried listening to a Tp on very low output volume with the > Marantz turned louder so to actually hear something i.e to more > resemble a pure power amp which doesn't control volume in any way but > simply amplifies by as much power as it has. > But anyway... Can someone educate me about whether tp has analogue or > digital output volume regulation. And how exactly does it work? If it > is digital is there any sort of magic math done to bypass the problem I > tried to lay out above. > Sean? Do you read this? ;) Tanks for any informing posts. > Cheers > Jeronimo
The 16-bit resolution is not an issue because the bit-depth is increased to 24 ahead of the volume control (and the DAC works in 24-bit). The only issue is the physical noise level of the Transporter. Fortunately this is very very low. The digital volume control reduces signal-to-noise ratio, but since the SNR is so high to begin with (much greater than the 96db you mentioned) there is nothing to worry about. Darren PS: I have just started using the SB3 digital volume control - all as above except the starting SNR of the SB3 is lower. Even so, I'm happy with the results in my preamp-less set up. -- darrenyeats SB3 / Inguz -> Krell KAV-300i (pre bypass mode) -> PMC AB-1 Dell laptop -> JVC UX-C30 mini system ------------------------------------------------------------------------ darrenyeats's Profile: http://forums.slimdevices.com/member.php?userid=10799 View this thread: http://forums.slimdevices.com/showthread.php?t=39611 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
