Kevin Tekel said:
stace said:
I remember some stations had what I called "burble bass". Instead of tearing up the vocals with clipping distortion, a strong, sustained bass note would itself sort of roll and tumble, giving the bass a "burbly" sound while leaving the vocals clean. Was that an 8200 thing? I haven't heard that kind of effect on the air in years... I just recalled it today by listening to an old tape I made around 1999 and hearing it... then I switched over to current FM, and heard WLTW completely tear up all the vocals on the Pretenders version of "Have Yourself a Merry Little Christmas" with horrible clipping.
I know exactly what you are talking about. I had plenty of experience with 'burble bass' at Z100, and I found it to be really annoying. It is not just bass, but the intermodulation of bass and midrange caused by clipping.
One of the things that surprised me was that the channel balance seemed to influence the magnitude of the distortion, which led me to believe that if the bass was balanced properly (i.e., mono), it wouldn't burble so much. My next conclusion was that this particular source of intermodulation would therefore be minimized by reducing the bass response in the L-R program. By doing so, you'd force the bass toward mono.
I tried a matrix with reduced-bass response in the L-R and was happy with the result.
When creating the analog Ariane (a matrix-only processor), I purposefully left out the lowest band in the L-R, and allowed the response to fall off at the rate of the next higher band's low-end response (-6dB/octave, at roughly 120 Hz), a subtle yet effective form of L-R bass reduction, which appears to reduce imbalance-based bass-burbling. Since humans are relatively insensitive to directionality at low frequencies, it's my opinion that subjectively it's a good tradeoff.
As long as the channels are carefully balanced into the final processor, the effect carries through to the subcarrier, where reduced low frequency L-R energy is an especially good thing when multipath is a problem.
L-R bass reduction is not a cure-all, but it seems to help in the burble department. It is a defeatable option in the Sequel.
Kind Regards,
David