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It would seem to me that series would be better--when you make-before-break to the next step, you're only putting two resistors in the last step in parallel, all the other resistors down the chain are still in series--so the resistance dip would be much less than in the case of ladder attenuators, where you're putting two whole chains of resistors in parallel and dipping down to half the resistance.

Yet series attenuators seem to sell for less. Did I not understand what is meant by 'series attenuators' or is there something else that makes them not so good?