Luked. Yeah your idea is a good one. then you can control the volume of the sum a little better.
Have the sub preamp follow (or be connected from or after) the main channel one. then the main channel master control is all you usually need to move. But if you want to adjust the sub in relation to the main, then the sub pramp volume can be moved.
Connecting the second one via volume controlled output is best. If you use the line out, or tape out, everytime you change the volume on the main, your sub will need to be adjusted. (which is a PITA)
And yeah, maybe using two may cause a slight degredation of some theoretical signal. The thing is, if it does what you want, that is way better than somebody elses 'theory' hey!
Have the sub preamp follow (or be connected from or after) the main channel one. then the main channel master control is all you usually need to move. But if you want to adjust the sub in relation to the main, then the sub pramp volume can be moved.
Connecting the second one via volume controlled output is best. If you use the line out, or tape out, everytime you change the volume on the main, your sub will need to be adjusted. (which is a PITA)
And yeah, maybe using two may cause a slight degredation of some theoretical signal. The thing is, if it does what you want, that is way better than somebody elses 'theory' hey!