Very loud portal in Wizard Tower Home

While the sound effect is faar better than it used to be, it is still a little too loud. Especially when I am not actually inside the tower but merely outside near where the portal is located. It's not bad for a momentary run through, but any long term time spent on the property it gets to be really obnoxious after a while. I think the fact that it is a very low frequency sound doesn't help since it's dominating the low end on my speakers.

Some tweaking would be much appreciated!