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--- motorsports:subaru-impreza-gen3 [2024/08/15 18:46] – [Bump Stops] marcos
+++ motorsports:subaru-impreza-gen3 [2025/01/02 06:49] (current) – marcos
@@ Line 352: / Line 352: @@
 \\
 Same key format used between 2008 and 2014.
+\\
+===== Car Sound System =====
+\\
+==== Subwoofer ====
+My car came with an amp and upgraded speakers.  There is a subwoofer box that is unsecured in the cargo area, that takes up too much space.
+[[https://www.reddit.com/r/CarAV/comments/tvu6lp/comment/i3cg6a8/ |Mtld83 on reddit]] is convincing me to go for a [[https://www.jbl.com/STADIUMBASSHUB.html |JBL Stadium BassHub]].  [[https://www.youtube.com/watch?v=kqgnNKI_sIo&t=55s |YouTube video showing BassHub innards]], showing a downward firing configuration.   [[https://www.reddit.com/r/CarAV/comments/129o1hw/anyone_ever_set_up_a_spare_tire_subwoofer/ |More reddit comments]].  [[https://www.2addicts.com/forums/showthread.php?t=1343207 |2addicts.com thread]].
+The volume in the spare tire can be slightly larger than under a single seat.  Also, it's easier to clean under the seat without a box.  Also, no impact to foot space.  Tools that go in the spare tire volume can be placed elsewhere under the cargo space floor.
+However, my spare rim (donut) is 4" wide and is dished outwards so the inside height is maybe 2".  The JBL Stadium BassHub height is 6.5".
+I could get an underseat subwoofer, but I'm still interested in having a round spare tire subwoofer even if I place it under the seat.  I have a inkling that a box shape isn't optimal for a speaker enclosure.
+The price for a new JBL Stadium BassHub has dropped as low as $300.  A cheaper alternative that isn't as tall: a Bose subwoofer that comes preinstalled on a variety of vehicles.  Available used on ebay for as low as $40.
+These Bose subwoofers are actually pretty good.  See [[https://www.youtube.com/watch?v=mijySlQRkgQ |How loud is the Bose subwoofer?  Dakoustics on YouTube]].  The JBL Stadium BassHub is 600W RMS, so it isn't a fair comparison to the 80W Bose.  An 80W subwoofer is better than no subwoofer, and the 120dB results from Dakoustics is more than enough:
+<WRAP center round box 95%>
+dB is a decibel level that describes extremely loud sounds. In fact, on a decibel chart, 120 dB marks the limit from which sounds become painful and very dangerous to the human ear." [[https://decibelpro.app/blog/how-loud-is-120-decibels/ |decibelpro.app]]
+</WRAP>
+<WRAP center round box 95%>
+Bass is very different, you can listen to much louder levels of bass and not go deaf. 120dB with subs is LOUD. 130db in the 30-40hz range can make your ears hurt the next day.
+ [[https://www.avsforum.com/threads/how-loud-is-too-loud.862375/ |avsforum.com]]
+</WRAP>
+OEM Bose Subwoofer dimensions:
+Dakoustics tested sub is a Bose "GAP4 66 960" for the Mazda vehicles like Mazda3 and CX3.
+{{:motorsports:bose-gap466960.webp?direct|Bose Mazda OEM Subwoofer}}
+<WRAP center round box 95%>
+CA10A - diameter 14.5" (365mm), height: 5.5" (135mm), single woofer, no amp
+1BM0A - diameter 16.5" (420mm), height 5" (125mm), two woofers, built-in amp
+[[http://forums.pelicanparts.com/porsche-928-technical-forum/663007-great-sound-stock-look-2.html |pelicanparts.com forum]]
+</WRAP>
+Well, these aren't going to fit under my seat, and if they do, they'll stick out the back.  Back to the drawing board.
+I found a BMW X3 underseat subwoofer on ebay for $25 shipped.
+++++ Stuffing the Enclosure |
+Add pillow stuffing to subwoofer enclosures to make the bass sound fuller (without the air-knocking sound as pressure waves bounce off walls of enclosure).  See [[https://mazdas247.com/forum/t/2nd-generation-cx-9-bose-subwoofer-improvement.123869524/ |mazda247.com forum]].
+++++
+\\

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