Как определить звукоизоляцию стены?

array(18) { ["USER_PROPERTY_NAME"]=> string(0) "" ["SHOW_FIELDS"]=> array(4) { [0]=> string(5) "EMAIL" [1]=> string(4) "NAME" [2]=> string(9) "LAST_NAME" [3]=> string(11) "SECOND_NAME" } ["REQUIRED_FIELDS"]=> array(3) { [0]=> string(5) "EMAIL" [1]=> string(4) "NAME" [2]=> string(9) "LAST_NAME" } ["AUTH"]=> string(1) "Y" ["USE_BACKURL"]=> string(1) "Y" ["SUCCESS_PAGE"]=> string(0) "" ["SET_TITLE"]=> string(1) "N" ["USER_PROPERTY"]=> array(0) { } ["CACHE_TYPE"]=> string(1) "A" ["~USER_PROPERTY_NAME"]=> string(0) "" ["~SHOW_FIELDS"]=> array(4) { [0]=> string(5) "EMAIL" [1]=> string(4) "NAME" [2]=> string(9) "LAST_NAME" [3]=> string(11) "SECOND_NAME" } ["~REQUIRED_FIELDS"]=> array(3) { [0]=> string(5) "EMAIL" [1]=> string(4) "NAME" [2]=> string(9) "LAST_NAME" } ["~AUTH"]=> string(1) "Y" ["~USE_BACKURL"]=> string(1) "Y" ["~SUCCESS_PAGE"]=> string(0) "" ["~SET_TITLE"]=> string(1) "N" ["~USER_PROPERTY"]=> array(0) { } ["~CACHE_TYPE"]=> string(1) "A" }