 | |  | |  | | CCA Hoser
Join Date: Sep 2007 Location: Ontario Brantford Posts: 170
| so what was the final answer? | 
|  | |   | | | | | CCA Back Bacon
Join Date: Dec 2004 Location: Richmond Hill Posts: 40
|  Quote: |
Originally Posted by scroudt111  have you upgraded your cars ground wires? Eg, engine block ground, chassis ground, alt ground? if not, try that. are you running your amp ground to the body of the car or straight to the battery? check those things out and see if that helps. | someone here hasn't done the big 3 themselves  | |
| | | | | | | | ~~ VENDOR ~~
Join Date: Oct 2000 Location: TORONTO Posts: 6,901
| Chris I gave up since it really did not matter. I like it with the car off anyways, keeps the environment clean. | |
| | | | | | | | CCA Hoser
Join Date: Sep 2007 Location: missisauga ON Posts: 92
| its pretty simple...my vehicle does the same thing. your exhaust is resonating your cabin on its own before the system is. So you're getting cancellation.
If dbdrag allowed burping with the vehicle on, you'd gain from deadening in different places that the exhaust pre-resonates | |
| | | | | | | | CCA Hoser
Join Date: Sep 2007 Location: Ontario Brantford Posts: 170
| i was just wondering....i'd like to know if i was right cause it's possible. | |
| | | | | | | | CCA Golden Toque
Join Date: Feb 2001 Posts: 1,126
| it's because the alternator in a crx doesn't put out power unless there is a load on it. This is why yulis is less loud with the car on and why my crx lost 0.5db between the pits and the lanes at finals. You need to turn the lights on in order to get a load so it charges
__________________ 
Current Canadian Record holder Street A 154.1dB
2008 dBDrag North American Finals 3rd Place 155.0dB
2 10" TF Ones + 1 American Bass 1000.1 + Odyssey 1750 | |
| | | |   | | | | Supporting Member
Join Date: Jan 2008 Location: Ottawa, Ontario Posts: 25
| | Quote: |
Originally Posted by ShockingCanada it's because the alternator in a crx doesn't put out power unless there is a load on it. This is why yulis is less loud with the car on and why my crx lost 0.5db between the pits and the lanes at finals. You need to turn the lights on in order to get a load so it charges | True but it doesn't explain why Yulis car is louder with the engine off. It just explains why it isn't louder when it's on.
I'm leaning towards turboeyore's theory with the vents. I did a little test a few years ago where I did spectrum sweeps of my car with the windows up vs down. The region below ~60Hz was 10dB higher with the windows cracked a few inches. This was with a ported box in the trunk. It's also why some people experience "better" bass with their trunk open. The sub is basically a box playing inside a box. The car cabin loads the woofer and detunes the enclosure.
Yuli try this out and maybe we'll have more clues: - key to acc., engine off, windows up
- key to acc., engine off, windows cracked a bit
- key to ON, fan on medium, engine off, windows up
- key to ON, fan on medium, engine off, windows cracked a bit
__________________
Kevin Murray | |
| | | | | | | | ~~ VENDOR ~~
Join Date: Oct 2000 Location: TORONTO Posts: 6,901
| | Quote: |
Originally Posted by turboeeyore ok this may be far fetched but yuli try this, when you're "burping" with the car off open the door. check the amp draw. the loss of pressure letting the sub's move more freely and uncontrolled would make the amp draw more maybe? so what i'm thinking is with the car off all the outside vents are closed, when you start the car the vacuum motor is opening the vent door in the heater box letting out pressure when the car is running. i hope it's that easy. | i'd have to say that you are................waaaaaaaaaaaay off | |
| | | | | | | | ~~ VENDOR ~~
Join Date: Oct 2000 Location: TORONTO Posts: 6,901
| | Quote: |
Originally Posted by kevmurray True but it doesn't explain why Yulis car is louder with the engine off. It just explains why it isn't louder when it's on.
I'm leaning towards turboeyore's theory with the vents. I did a little test a few years ago where I did spectrum sweeps of my car with the windows up vs down. The region below ~60Hz was 10dB higher with the windows cracked a few inches. This was with a ported box in the trunk. It's also why some people experience "better" bass with their trunk open. The sub is basically a box playing inside a box. The car cabin loads the woofer and detunes the enclosure.
Yuli try this out and maybe we'll have more clues: - key to acc., engine off, windows up
- key to acc., engine off, windows cracked a bit
- key to ON, fan on medium, engine off, windows up
- key to ON, fan on medium, engine off, windows cracked a bit
| and you sir.................are off as well | |
| | | | | | | | ~~ VENDOR ~~
Join Date: Oct 2000 Location: TORONTO Posts: 6,901
| my car, and pretty much every single car i tested with, is louder with the vents open.
in the crx, you can open the vent manually, regardless of the car being on or off. mine is always open, it is always louder with it open. every car i've touched for street was louder with the vent and blower open. | |
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