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This has me very intrigued to try the Magnum V5 again... I can say with certainty, that my Magnum V5 had less bass presence than all the Grados I've ever tried. Including SR60i with L-Cush pads. I was using Vibro Classic Cups, which have a U-shaped cut-out in the wood for the cable entry, which I somewhat suspected to be the cause of the lack of bass. But it seems the drivers may have had more to do with it...
First I would try to isolate the problem, (if you can desolder and resolder cable and drivers) maybe by either trying your Magnum drivers elsewhere (in the air and/or in another pair of cups), and trying your MartinCustomAudio cups with another pair of drivers.
The Magnums should not lack bass... I can tell you that my own Magnum v5 has a lot more bass than all Grados I've owned (2001 RS-1, 1996 RS-1, 2005 SR325i, 1998 SR325 and HP 1000).
You can always send the whole thing to Rhydon or Turbulent Labs, maybe MartinCustomAudio too (which ever happens to be the closest to you) and have them verified; it's a service that they actually offer.
This has me very intrigued to try the Magnum V5 again... I can say with certainty, that my Magnum V5 had less bass presence than all the Grados I've ever tried. Including SR60i with L-Cush pads. I was using Vibro Classic Cups, which have a U-shaped cut-out in the wood for the cable entry, which I somewhat suspected to be the cause of the lack of bass. But it seems the drivers may have had more to do with it...