Gain and linestage


If someone could, please explain how a preamp can impede the rated power of an amplifier?  At least that's how I interpret the discussion.This was a discussion I was reading on the Butler TBD 2250 amp and someone looking for a good matching preamp.Hopefully the link comes through below.
https://forum.audiogon.com/discussions/preamp-recommendations-for-a-butler-tbd2250?highlight=butler
Thanks
colpgmrguy

Showing 1 response by colpgmrguy

If I look at the Butler TBD 2250 specs, I see this:
 Input Sensitivity: 2V for 250 Watts into 8 Ohms 
Which I'm sure is the relevant spec to look for on the amp?But for the preamp, what's the relevant spec?  For a Parasound PA6, I see this: Preamplifier Stage Input Sensitivity
300 mV in for 1 V
Total Gain: 10 dB
Max Output: 7.5V Sorry guys.  This one caught me by surprise.  I knew users looked at amp/preamp combos from the "match by sound quality" perspective, but not by this.