Hi, I'm hoping that some of the speaker gurus can help me on this one. I'm about to combine two cabs which are exactly the same, just one has a tweeter. They will be combined using a series cable so that the two 4 ohm cabs will make an 8ohm impedance for my tube head. I'm told that this combo will cancel out the tweeter because there will be a rise in impedance in the cabinet without the tweeter. Could someone spell out the science behind this? Is it that the cab with the tweeter doesn't actually see the high frequencies or is it that the high frequencies somehow get cancelled out during the output of the speaker? Many thanks!