High order is needed when drivers are used to the extremes of their operating range. Often high order notch filters are used with modern light weight metal or ceramic drivers - this is an attempt to reduce the out of band "ringing" - it often works although at higher output levels ringing can still be audible issue.
High order filters and notch filters may introduce phase shifts that can be detrimental, however, they seem to be common these days. In the past designers would stick to first order filters.
High order filters and notch filters may introduce phase shifts that can be detrimental, however, they seem to be common these days. In the past designers would stick to first order filters.