I agree with some of the other posters; before you go shelling out for interconnects or speaker cablem to "cure" your problem you should look less expensive and more effective solutions to root out the cause of the grain, fatigue and thinness.
Very often, graininess is indications of a power problem, so a power conditioner is a good place to start. use it on your source components primarily, but it may also work for you on amps and preamps (although it CAN restrict dynamics there). That might also lessen the fatigue issue somewhat.
Now try taming your speakers with some really inexpensive tweaks, like felt around the tweeter (experiment with different amounts and placements - you don't always need a lot to make an effective difference).
Now try taming your room by treating 1st reflection points.
Lastley I would look at cables, but remember that they are not a cure for a lack of system synergy netween the other components. If your problem lies there then using different cables is a waste of time and money. Cables are just a fine tuning mechanism at best.
Good luck,
Bob
Very often, graininess is indications of a power problem, so a power conditioner is a good place to start. use it on your source components primarily, but it may also work for you on amps and preamps (although it CAN restrict dynamics there). That might also lessen the fatigue issue somewhat.
Now try taming your speakers with some really inexpensive tweaks, like felt around the tweeter (experiment with different amounts and placements - you don't always need a lot to make an effective difference).
Now try taming your room by treating 1st reflection points.
Lastley I would look at cables, but remember that they are not a cure for a lack of system synergy netween the other components. If your problem lies there then using different cables is a waste of time and money. Cables are just a fine tuning mechanism at best.
Good luck,
Bob