standard dual gang 50k logarithmic potentiometer

Can you tell me if this is what I am looking for?

Question: Why 50K? I have no idea of what an appropriate resistance would be, and am willing to take your word for it that 50K is right... but what does that 50K get me? My goal would be virtually complete silence on one end, and zero attenuation on the other. Is that what 50K will do in this instance? If it is of any significance, the signal is going through a line driver before it gets to the equalizer, and the potentiometers will be receiving it at about 6 volts. As you can see, they are available in everything from 1,000 ohms to 1 billion ohms maximum resistance. 50K is the optimum?

Question: Is the 1/4 watt power dissipation figure shown in the data sheet a sane number? Again, I have no idea of how much power these pots might have to dissipate if turned to maximum resistance. Does that depend on the size and nature of the amplifiers? They are all 100 watts/channel Class T amplifiers, feeding speakers that are wired 4-Ohm.

tanstaafl.