Sorry, this is not a smart question. Do you, by chance, have the KAB hooked between your turntable and your phono stage, it should be after the phono stage, before the preamp, or in the processor/tape loop?
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No..the KAB is connected between the phonostage and the preamp. Kevin @ KAB emailed me and said a MM cartridge with a 5mV output and 55dB gain could overload the KAB filter. The Clearaudio Maestro has an output of 3.6mV but I guess this could happen. Perhaps my assumption that the KAB is just a filter and it will output whatever comes into it (after filtering the low rumble) is wrong, since it CAN be overload. I'll try to contact them just to make sure.
I had the same experience with the KAB filter when I switched preamps.
The problem, according to the designer of the new SS preamp (Reflection Audio OM-1), is that the tape output is not buffered, whereas it was buffered on my old one, a tube design. Therefore I could not use the tape loop.
I do not know how common it is the have an unbuffered tape out but potential users of this fine rumble filter should be alert to this possibility.
It's an overload issue, just as Kevin explained. 50-55 dB of gain for a cartridge with an output of 3.6 mV is way too much. 55 dB works well with my Delos that has an output of 0.6 mV,six times less than the Maestro. I've had the KAB in my chain for a few years now, with no overload issues. Go to the KAB website and plug in the output into the gain calculator, and adjust your Steelhead accordingly. I would expect the sound to improve as well, no overload aside. I'd expect that much gain to make the highs shrill and edgy in the great majority of set-ups.