[faileas]

I'm currently sourcing out parts for a amp, and am pondering making a few mods - one of the issues with the design, apparently is a large DC offset on being switched on, and i was told by someone (who knows just about enough electronics to be dangerous) that a coupling capasitor might be a good idea. I'm considering my options and i'd like to understand the practical aspects of it and the advantages and disadvantages of various setups.
 
I get that RC needs to be as large as possible, and to me, since most common caps are in the microfarad range having a large resistor makes sense to me - if i have a 1megaohm resistor i'd only need a >> 0.05 uf cap (I think). On the other hand, i've noticed many builders seem to favour very large caps - so i'm wondering if there's any problem with using large resistors that isn't obvious from the math.

 

[Avro_Arrow]

If you are placing a cap in the output, the resistance is determined by the load.
Thats why you see very large caps being used for output.
 
On the inputs, you have a little more freedom but here the trade off is noise.
The higher the value of resistor, the more noise it generates.

 

[dsavitsk]

If the offset is just a transient, that is, if there is an offset for a short time that goes away once the amp is on, then you'll do better with a relay delay system.  Amb sells such a thing.