What did you do to your GE fit today?
Member
Joined: May 2017
Posts: 105
From: Wilmington
Hatchbacks almost always have higher Transfer Function than sedans at low frequencies. The main reason is exactly as shinjari states - the sub enclosure is free from the constraints of the trunk, which unfortunately acts as a restrictive enclosure in a sedan, unless you install "free air" subs, in what's known as Infinite Baffle, unsing the entire trunk as the enclosure.
In a hatchback, the sub enclosure is the smaller of the two "boxes," the larger being the interior volume of the cabin itself. Sub bass will always be louder in the larger of the two boxes (the cabin in this case). An easy way to observe this theory in practice is to crack the driver's window 3" or so in the middle of a low, long bass note. You will notice the bass gets noticably louder, to some degree. This is because you have now ported the 2nd box (the cabin) to an even larger area - outside into the atmosphere. This makes the 2nd box essentially a Band-Pass enclosure, and the transfer function is increased even more at low frequencies.
If you have a REALLY large system, with multiple subwoofers, you can go even further with this, by parking in a small garage, then listening as the window is rolled down, and then the garage door is cracked next. When I installed SPL systems, we used to mess with these tricks just for geek giggles. But they are neat exercises to observe the physics of sound.
You wanna talk unwanted panel vibration? Try losing a windshield every time you compete. We had to install Lexan windshields in some vans to prevent them from shattering from the high SPL. I also saw a Civic with 8, 15" Cerwin Vegas buckle its own roof with bass, and it looked like the car had been rolled!
Member
Joined: Dec 2015
Posts: 1,655
From: San Diego, CA
This phenomenon is known as Transfer Function. Transfer Function is the ratio of output to input, in this case measured in dB, which the subwoofer (or other) frequency is boosted from placement in an automobile, room, or any enclosure larger than that of the subwoofer, but smaller or more restrictive than a 3rd enclosure (the atmosphere). This is a crude explanation of Transfer Function, but nonetheless, it is somewhat basic as it related to SPL (sound pressure level) in automobiles.
Hatchbacks almost always have higher Transfer Function than sedans at low frequencies. The main reason is exactly as shinjari states - the sub enclosure is free from the constraints of the trunk, which unfortunately acts as a restrictive enclosure in a sedan, unless you install "free air" subs, in what's known as Infinite Baffle, unsing the entire trunk as the enclosure.
In a hatchback, the sub enclosure is the smaller of the two "boxes," the larger being the interior volume of the cabin itself. Sub bass will always be louder in the larger of the two boxes (the cabin in this case). An easy way to observe this theory in practice is to crack the driver's window 3" or so in the middle of a low, long bass note. You will notice the bass gets noticably louder, to some degree. This is because you have now ported the 2nd box (the cabin) to an even larger area - outside into the atmosphere. This makes the 2nd box essentially a Band-Pass enclosure, and the transfer function is increased even more at low frequencies.
If you have a REALLY large system, with multiple subwoofers, you can go even further with this, by parking in a small garage, then listening as the window is rolled down, and then the garage door is cracked next. When I installed SPL systems, we used to mess with these tricks just for geek giggles. But they are neat exercises to observe the physics of sound.
You wanna talk unwanted panel vibration? Try losing a windshield every time you compete. We had to install Lexan windshields in some vans to prevent them from shattering from the high SPL. I also saw a Civic with 8, 15" Cerwin Vegas buckle its own roof with bass, and it looked like the car had been rolled!
Hatchbacks almost always have higher Transfer Function than sedans at low frequencies. The main reason is exactly as shinjari states - the sub enclosure is free from the constraints of the trunk, which unfortunately acts as a restrictive enclosure in a sedan, unless you install "free air" subs, in what's known as Infinite Baffle, unsing the entire trunk as the enclosure.
In a hatchback, the sub enclosure is the smaller of the two "boxes," the larger being the interior volume of the cabin itself. Sub bass will always be louder in the larger of the two boxes (the cabin in this case). An easy way to observe this theory in practice is to crack the driver's window 3" or so in the middle of a low, long bass note. You will notice the bass gets noticably louder, to some degree. This is because you have now ported the 2nd box (the cabin) to an even larger area - outside into the atmosphere. This makes the 2nd box essentially a Band-Pass enclosure, and the transfer function is increased even more at low frequencies.
If you have a REALLY large system, with multiple subwoofers, you can go even further with this, by parking in a small garage, then listening as the window is rolled down, and then the garage door is cracked next. When I installed SPL systems, we used to mess with these tricks just for geek giggles. But they are neat exercises to observe the physics of sound.
You wanna talk unwanted panel vibration? Try losing a windshield every time you compete. We had to install Lexan windshields in some vans to prevent them from shattering from the high SPL. I also saw a Civic with 8, 15" Cerwin Vegas buckle its own roof with bass, and it looked like the car had been rolled!
So far the cabin noise is somewhat reduced, some previous vibrations/rattles are definitely gone as well. Going to use the CLD tiles I have left on the trunk area and if I have any remaining after that I'll tackle the roof. Not sure if i will go the whole MLV route, but if I come across some locally...then I might. The stuff is just so expensive to ship.
Member
Joined: Dec 2015
Posts: 1,655
From: San Diego, CA
Wish we got the same front end as you across the "pond", so much nicer looking.
Member
Joined: Mar 2009
Posts: 201
From: Los Angeres
My color is Avery Gloss Metallic Brown specifically if that helps! I don't know how different 3M's browns are.
Please focus on cleaning it before you modify it. That thing looks abused.
Member
Joined: Dec 2015
Posts: 1,655
From: San Diego, CA
Member
Joined: Apr 2012
Posts: 1,779
From: edmonton, canada
Tell me about it, theyre even nicer in person!
Member
Joined: Dec 2015
Posts: 1,655
From: San Diego, CA
Tint looks good (and the Milano red), but think you meant to put this in the GD thread?
Aren't you over there right now? How come you're not posting Jazz pics? haha
Aren't you over there right now? How come you're not posting Jazz pics? haha
Member
Joined: May 2017
Posts: 187
From: Missouri
Yeah I suppose so...lol Question, why is the 2nd gen starting with 08 abut the first gens stop in 08....lol
Member
Joined: Dec 2015
Posts: 1,655
From: San Diego, CA
Gotta admit...that brown looks pretty sharp. Did you do the wrap yourself? If not, where and roughly how much did that run?
Member
Joined: Apr 2012
Posts: 1,779
From: edmonton, canada
Im meeting a guy i know from tfc while im here. Not sure when yet.