High pass /group delay linked

[asiquis]

It appears to me when I apply a high pass filter in winISD to prevent over excursion, the group delay increases significantly--is this anything to be concerned with (audible)??

I am looking at a Tempest X in a 380-400 liter enclosure with 1 X 8" port and 500 wpc amp tuning 15-16 Hz

I thought there was a graph or article or rule of thumb about this somewhere?
Thanks

[Mike P.]

I modelled it and you're right. I'm not sure if this is a problem or not. Hopefully someone will join in on this.

[atledreier]

Interesting.

I just can't get my head around why adding a high pass would affect group delay or transient response, either... Hopefully someone in the know will chime in...

[lcaillo]

Any filter introduces delay effects at some frequency. There are ALWAYS trade-offs in the application of filters. The question is whether the gains in frequency response are worth the trade-offs in phase response.

[Warmon]

Same thing happens when you add boost - it will also increase excursion.

[BoomieMCT]

Yeah, any filter is going to change the group delay. Generally as frequency goes down this becomes less important. What shape does your group delay graph have (post a pic, maybe?)

[Geoff St. Germain]

Yep, a high pass filter causes this group delay. The issue is whether the group delay exceeds one cycle at any frequency. This is generally taken to be the point at which it becomes an issue.