Tortuga Preamps

If only the Lightspeed had 3 inputs......I would sacrifice a " little " in sq for the convenience. George feels it sacrifices a lot in sq

Like I say to all that ask for a multiple input Lightspeed, you can always get one of these to put in front of it, http://www.goldpt.com/sw4.html that way you still have the option to leave it out, when you want seriously listen without any source switching in the signal path.
As that’s what the Lightspeed Attenuator is all about, "no contacts at all in the signal path", volume control or input switches, from your source to speakers

Cheers George

George, I had thought that the Tortuga's calibration of the LDR's LED control current curve is invoked periodically by the user on an as-needed basis, not "actively" or on-the-fly.  If it's performed only periodically, how will this degrade SQ? 

Recluse, I enjoyed mine very much. It is very open and transparent. I was surprised to see that it measured so poorly. I have gone back to my active preamp due to selling my separate phono stage.

Love my Tortuga !

It’s an active circuit attached to the output, which is the audio signal, and not being match need calibrating at every increment of volume adjusted to stay calibrated.
If you have "say" 3 led/ldr’s (could be two or one, as they are not matched) of the 4 led/ldrs running at "x" impedance, the other/s may get over worked trying to keep up and visa versa which shortens their life span.
Also you need to use the NSL32SR2S to get low enough impedance to get the lowest volume.
Just look at the data sheets if you can understand them, of all that I have posted up many times here and at DiyAudio, and look at max 20mA brightness for the lowest impedance attained.

Cheers George