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+Title: Theatre Acoustic Panels
+Date: 2021-10-21
+Category: Creations
+Summary: Panels for acoustic treatment in my home theatre.
+Short: 3
+
+Acoustic treatment is one of the most overlooked aspects of home audio. There's
+no point in spending money on premium speakers if the room they are playing in
+has poor acoustics.
+
+The primary purpose of acoustic panels is to reduce the reverberations caused by
+sound reflecting off the smooth walls of the theatre. The path of the reflected
+sound is a longer distance to your ear compared to the sound coming directly
+from the speaker. This causes the reflected sound to be delayed by the time it
+reaches your ear. The delayed signal interferes with itself, causing comb
+filtering which distorts the signal.
+
+Acoustic panels are placed geometrically where the sound from the speakers would
+reflect off the wall to reach the listener's ears. The insulation inside the
+panels absorbs energy from the soundwave which reduces its volume and
+interference.
+
+![twelve L-shaped corners of the panels stacked together leaning on a table saw in a wood shop]({static}/images/panel/panel1.jpg)
+
+I made six frames in the wood shop of my local makerspace, Protospace.  After
+cutting the 1x4" pine boards to length, I made a jig so I could quickly join
+them together with screws.
+
+![a panel with insulation inside on the ground about to be wrapped with black fabric]({static}/images/panel/panel2.jpg)
+
+I added 4" batts of Rockwool insulation into each frame after it was assembled.
+I then wrapped the frame with black speaker fabric and stabled it in place while
+trying to pull it taut.
+
+I sat in my theatre while a friend slid a handheld mirror along the wall until I
+could see the middle of the speaker in its reflection. This told me the centre
+point of where to mount each panel because the reflected sound would take the
+same path to my ear.
+
+<span class="aside">Four in the front, two in the back</span>
+![four black acoustic panels mounted on the walls in my home theatre]({static}/images/panel/panel3.jpg)