"My "listening room" is my garage, unheated and uncooled..."
Out of curiosity, is this garage dedicated/converted to a listening room, e.g., furniture, room treatment, etc., or is a "multi-purpose" garage with car(s) and also used for music listening? Safely assuming the former, is it a one car or two car garage? I think the size and the nature of the use environment will play into what will work better in your application.
As you know, the Unlimited has a separate (from volume control) gain control that can be adjusted to deliver up to 5 volts of output. That may allow you some flexibility in selecting the amplifier and its associated gain. For comparison, my Unlimited (using 12AX7 tubes) is driving an 18wpc Aric Audio SE KT88 amplifier into 93dB/1w/1m speakers and I have to keep the gain control way low to allow for a reasonable range on the volume control and I still rarely go past 12 o'clock.
Out of curiosity, is this garage dedicated/converted to a listening room, e.g., furniture, room treatment, etc., or is a "multi-purpose" garage with car(s) and also used for music listening? Safely assuming the former, is it a one car or two car garage? I think the size and the nature of the use environment will play into what will work better in your application.
As you know, the Unlimited has a separate (from volume control) gain control that can be adjusted to deliver up to 5 volts of output. That may allow you some flexibility in selecting the amplifier and its associated gain. For comparison, my Unlimited (using 12AX7 tubes) is driving an 18wpc Aric Audio SE KT88 amplifier into 93dB/1w/1m speakers and I have to keep the gain control way low to allow for a reasonable range on the volume control and I still rarely go past 12 o'clock.