Westfield B-1000 tone control - 'closed' drops my volume

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My beater Westfield P bass B1000 which incidently I really like, has a strange quirk in that if I set my tone control to 'closed', or 'bass' setting I loose quite a bit of volume (gain/output), something I don't notice much on my other basses.

This is my 'at work' noodling bass and only ever plays into a Trace GP7SMC-8210H....as if that would make difference?

...any idea's?

...I suppose an explanation of what really happens when I close my tone would be helpful to me, I'm guessing as its quite a bright sounding bass I'm loosing quite a bit of signal, hence the drop in 'volume'???

[daz]

I have one exactly the same model, but it does not lose any volume when tone control is moved in any direction.

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[quote name='daz' timestamp='1352551785' post='1864495']
I have one exactly the same model, but it does not lose any volume when tone control is moved in any direction.
[/quote]

....you not using a compressor by any chance?