{"id":111,"date":"2015-02-15T17:37:08","date_gmt":"2015-02-15T09:37:08","guid":{"rendered":"https:\/\/projectkeira.com\/home\/?p=111"},"modified":"2019-11-14T17:20:04","modified_gmt":"2019-11-14T09:20:04","slug":"door-deadening-with-dynamat","status":"publish","type":"post","link":"https:\/\/www.projectkeira.com\/home\/door-deadening-with-dynamat\/","title":{"rendered":"Dead Doors."},"content":{"rendered":"

With the Alpine PDX-V9 amplifier<\/strong>\u00a0<\/a>feeding over 550-watts to the pair of 10\u201d JL Audio Subs<\/a><\/strong>, bass output was awesome when I turned it up. Also awesome was how much metal and plastic was buzzing with every bass hit! I did the “knock test” on my brother\u2019s truck – where you first knock on a stock door panel (and it sounds hollow with a high pitched \u201cding\u201d) and then knock on a panel with sound damping installed (and it sounds solid with a low \u201cthunk\u201d) – and I understood immediately what Dynamat does. I ordered up two bulk pack boxes of Dynamat Xtreme<\/strong> to begin this portion of my audio upgrade.<\/p>\n

First I took some baseline SPL readings for comparison later. To measure the sound levels I used a miniDSP Umik-1<\/strong> calibrated microphone and Room EQ Wizard\u2019s SPL meter<\/strong> function on my laptop. I had the mic positioned in the center of the vehicle, approx. 4 inches above the center arm rest. Idle test was taken at a dead end industrial street on the weekend to ensure that there was little chance of extra outside noise clouding my measurements. The 30 and 60mph tests were done on a quiet stretch of road in the same area. Yes, I’m pretty sure there\u2019s a more scientific way of doing this but I didn\u2019t get all complicated with it since I only took measurements out of curiousity:<\/p>\n

BASE MEASUREMENTS (C-weighted)<\/u><\/strong><\/p>\n