oefficients by an arbitrary factor.
        let coefScaleFactor = 2;
        for (let k = 0; k < fb2.length; ++k) {
          fb2[k] = coefScaleFactor * fb1[k];
        }

        let iir1;
        let iir2;

        should(function() {
          iir1 = context.createIIRFilter(ff, fb1);
        }, 'createIIRFilter with normalized coefficients').notThrow();

        should(function() {
          iir2 = context.createIIRFilter(ff, fb2);
        }, 'createIIRFilter with unnormalized coefficients').notThrow();
