Just purchased an X-30 to give me more flexibility and convenience in setting up my B&W subwoofer. The question I have is: How do I set the sub level now that I have it connected to the x-30? The x-30 is connected between the Pre and the Front channel amps. The speaker are set to large with all the others set to small. Now that I'm not using the LFE/sub out is there a way of setting the level using a sound level RS meter or do I just have to use my ears? Hope this makes sense?