hat i don’t like is even more limitation with Lightspeed to have just ONE input.
It meant to be like that on purpose, because it eliminates the "source selector" switch which is another lightweight potential distortion causing contact taken out of the signal path. The Lightspeeds all about no contacts in the signal path.
As you can see if you follow the green signal path, the music goes from input to output through nothing but a fixed resistor, unlike other preamps which have many contacts (that are very light in contact weight) that the signal has to go through.
http://www.diyaudio.com/forums/attachments/analog-line-level/470539d1425885769-lightspeed-attenuator...
A couple of customers use these external "source selectors switches" if they want to switch multiple sources and couldn’t be bothered changing over interconnects for non serious listening.
That way they have the option of still hearing the best without it when they want or to impress their friends by going back to direct into the Lightspeed. with no source selector.
The Goldpoint one is the better, it also seems it has the option of bypassing the source selector switch (see they know), BUT!! with what? another contact inside, so they take the nasty away but replace it with a not so nasty pin plug jumpers?
http://www.goldpt.com/sw4.html
https://cdn.shopify.com/s/files/1/0933/8332/products/51NDp9qHxUL._AA500_grande.jpeg
Cheers George