Hi, I manufacture the Lightspeed Attenuator, what you get over all other types of active or passive pre's is a transparency and extension and both ends of the frequency spectrum, also the sound stage is larger and less confined with more 3d, gone is a squeezed out, shot at you type of sound that active pre's seem to have after listening to the Lightspeed.
Be careful though, a note on the operation of the components that are the controlling factor for the Lightspeed Attenuator in my design, the variable series LDR’s for each channel and the variable shunt LDR’s for each channel are all matched as quad sets, very hard to get right. Unlike what some copiers of the Lightspeed Attenuator are doing, which have fixed series resistors and variable shunt LDR’s. This is a cheaper much easier way of manufacturing one, but does not nearly sound as good, this was the difference to my earlier mkI and now the mkII. All my previous mkI's have now been converted into mkII's
Cheers George