This paper describes a simple method for signiﬁcantly improving Tandem features used to train acoustic models for large-vocabulary speech recognition. The linear activations at the outputs of an MLP classiﬁer were modiﬁed according to known reference labels: where necessary, the activation of the output unit corresponding to the correct phone label was increased in order to make an accurate classiﬁcation. This technique was inspired by another experiment that determined a lower error bound on ASR performance within the Tandem framework. By simulating an idealized classiﬁer with forward-backward phone posterior probabilities, we observed a best-case scenario in which nearly all errors were eliminated. Although this performance is not practically achievable, the experiment demonstrated the validity of the Tandem processing approach and suggested that considerable gains are possible by improving the MLP phone classiﬁer.