Hi Montalk,
The easiest and least expensive option is to make sure the seal around your present door is made correctly. There are rubberized sealing sections that you can find at any building supply center like Home Depot that are afixed to the inside of the door jamb and compress when the door is closed which makes a relatively tight seal. You may want to attend to the opening at the bottom of the door as well. If you already have a good seal on your door then you can persue more elaborate options such as full hood or cowl that can be fabricated out of rigid fiberglass and/or closed cell foam that can be placed over your existing door when you are listening.
Best Regards,
Barry Kohan
The easiest and least expensive option is to make sure the seal around your present door is made correctly. There are rubberized sealing sections that you can find at any building supply center like Home Depot that are afixed to the inside of the door jamb and compress when the door is closed which makes a relatively tight seal. You may want to attend to the opening at the bottom of the door as well. If you already have a good seal on your door then you can persue more elaborate options such as full hood or cowl that can be fabricated out of rigid fiberglass and/or closed cell foam that can be placed over your existing door when you are listening.
Best Regards,
Barry Kohan