Second phantom still a good idea?

[LEPPAL]

Hi, have just purchased a second silver and think the overall performance experience is better and worth the cash - however I seem to have to increase the volume setting to reach the listening level I used to achieve with just one phantom. I would have expected the sound would be twice the volume for any given setting, given both speakers are active but this does not seem to be the case and at best is the same, but I suspect less than just one - has anyone else had the same experience???

Steve.