The reproduction of sound in a reverberant environment leads to spectral modifications that are typically perceived as coloration. It is well known that a dichotic instead of a diotic presentation of such signals leads to reduced perception of coloration [Salomon (1995), Ph.D. Thesis, TU Delft]. In this contribution, a new method is presented for quantifying the reduction in coloration due to dichotic presentation. In this method, the first part of a Binaural Room Impulse Response, pre-dominantly responsible for the spectral envelope is extracted, and the spectral modulations are parametrically modified and reinstated on a minimum-phase Impulse Response that is convolved with pink noise and musical instruments and presented diotically to the listeners. Their task is to adaptively adjust the spectral modulations until this diotically presented stimulus sounds equally colored as a dichotically presented binaural signal. Results show that the spectral fluctuations expressed as standard deviations in decibels needs to be reduced by 1-2 dB for the diotic presentation to sound equally colored as the dichotic presentation.