Amp for lightspeed attenuator? = $1000 used

Dddrrreee, good advice from Clio09 on the Music Reference RM-10 MkII a quite few Lightspeed Attenuator owners have had great success with this amp, saying it's a match made in heaven.
As does the amps Sam Tellig from Stereophile, he uses the Lightspeed Attenuator with his Quicksilver Silver 70 mono blocks and his much loved low powered Sun 2A3 single ended triode monoblocks, and used the words.
"the harmonic presentation was nothing short of flabbergasting. As a former (very poor) pianist myself, I look for the magic of the moment—the sound, not so much the movement, of the notes. I know that, in musical performance, timing is everything. Still..."

Cheers George

"Dddrrreee As a complicating feature, I'm using Y connectors to split the lightspeed output signal so I can feed it to a velodyne SMS-1 bass management unit (which I use to drive two subs).Dddrrreee"
You can get me on "georgehifi at optusnet dot com dot au"

As with any other system active or passive these "Y connectors and active subs" brings in another added equation to the impedance matching, of system compatibility.
If you use active subs, this makes the load to the Lightspeed and the source even more difficult, then I suggest a buffer after the Lightspeed like the "Burson 100 Buffer" which unfortunately is no longer available new, you may find one second-hand or another equivalent that is a pure buffer with no volume controls or selector switching on it.

Cheers George

Oh, ok then then all you need is it set it for 3db gain, and if you can bridge out the rotary input switch, it's not as bad as having a pot in the signal path, if it's a dual leaf switch (that is one leaf either side of the wiper). If single leaf then bridge it out and only use one input.

Cheers George

Dddrrreee: Trouble is I think the 160 has a lot of gain, and a volume control that has to be bridged out so the Lightspeed can shine through, the whole reason is not to have contacts (volume pots)in the signal path. The 100 is better if you can get them to make one or a kit.
http://www.6moons.com/audioreviews/burson/buffer.html

Cheers George

Dddrrreee: trouble is the xdac is a tube ouput stage buffer you will be back in the same boat trying to drive your 10k amp and ?k two times active subs from it. It needs to be a solid state buffer. with 100ohms or less output impedance.

Cheers George

Hi Dddrrree, your Lightspeed will work into the 10k input impedance of your present amp with no stress to any components.
However it now becomes the source cdp/dac which has to be able to drive the combined impedance of the 10kohm of your amp and the input of the Lightspeed, which equates to around 5kohm combined. This is still fine for the majority of low impedance output sources which have solid state output stages of 100ohms or less.
But it becomes a problem with tube output stage sources cdp's dac's etc, that are usually sometimes over 2kohm output impedances, then you could hear some dynamic compression, still not harmful to any components.
If you want to get the best from your Lightspeed Attenuator, then yes the poweramp input impedance should be over 47kohm which is the industry standard for solid state amps and tube power amps are well over that at 100kohm or more, which are even better.
Cheers George