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