MYTH or TRUTH

[quakerroatmeal 10+ year member]

I've heard carpet absorbs sound-waves?

 

[PV Audio 5,000+ posts]

Four comp vr 10s, doing a 155? We're going to need more details. What mic is all of this on? I only question because you're asking a question like this, but yet it seems natural that you're in the mid 150s. Quite difficult.

 

[jaco 10+ year member]

not 155 yet 152.6 best so far 5.5 cubes @ 38 Hz 84 square inches of port.

that was on dash pass. side with driver window down. on a 40hz to 60hz sweep.

build ing another enclosure tuned @ 42 hz or 45 hz to see if i can get a 155.

i just do local comps and drive the car a few times a week.

but trying to keep it with in rules for MECA street rules.

 

[blackbonnie 5,000+ posts]

looks like a job for adam and jamie

on myth busters

great show

 

[Ctminime 10+ year member]

see all that he has to do is carpet... maybe lose one DB but then.... (and this is the crazy part) thrown an audiobahn sticker on his car an no only make up for the DB he lost on the carpet but also gain 2 extra!!!! its the 3 DB audiobahn law.... u can gain another six DB if u have ure CVRs baskets chromed.... haha

 

[KARLEON 10+ year member]

only way to truthfully find out is to get a meter and test your own stuff. I mean, i doubt if you loose a whole db...but possible partial of a db....

Assuming from your post, you dont compete. I say that because if you did, you would of did your own testing before asking. And if you do loose a db or a little less than a db, i highly doubt your ears could tell.

 

[KARLEON 10+ year member]

i retract my statment about you competing. I just read the 1st page and went ahead and responded to your answer. Well since you do compete, just meter your system with carpet and without carpet. See which one is louder and run with it.

 

[PV Audio 5,000+ posts]

not 155 yet 152.6 best so far 5.5 cubes @ 38 Hz 84 square inches of port.that was on dash pass. side with driver window down. on a 40hz to 60hz sweep.

build ing another enclosure tuned @ 42 hz or 45 hz to see if i can get a 155.

i just do local comps and drive the car a few times a week.

but trying to keep it with in rules for MECA street rules.

No, what mic is this on. I don't think you realize how incredible a 155 score is, let alone with entry model speakers.

 

[AudioAnonymous 10+ year member]

His 152.6 could be in the kick panel which is usually a 3-7 db difference from the windshield in those cars.

To gain I would raise the tuning of your box up. Shrink the size a little bit.

 

[luvinthebass 5,000+ posts]

I've heard carpet absorbs sound-waves?

yeah, i think the carpet and seats of the vehicle do absorb the sound waves, i know they do in my car or you'd hear the bass as loud as it is in the car on the outside and it isn't it's quieter. so it does absorb it.

His 152.6 could be in the kick panel which is usually a 3-7 db difference from the windshield in those cars.
To gain I would raise the tuning of your box up. Shrink the size a little bit.

heh i used my walmart boom meter and hadit rest on my center console it read 130.1 db's then i placedit on the dash near the windshield and it read 135.5 db's, kickpanel same thing

 

[MikeyB 5,000+ posts]

it's a CRX and a fart box.we're trying to go up to 155

building a box tuned to 45hz

but i keep blowing the cvr's

maybe in the port //content.invisioncic.com/y282845/emoticons/*******.gif.a649d21efc0d1fd4890a6428166586c1.gif

 

[Symon_say 10+ year member]

True i gain 2 dB covering my box with toilet paper.

 

[jeremiah 10+ year member]

they're either 17 and dont knwo bettr or the people who convinced them just dont understand physics.......typically, no......unless u carpet 10 layers of the port, maybe yes...otherwise no...........

hea im 17 you a$$

 

[Crown_amps]

i don't know like i stated i've herd tons of people over years saying that carped takes away a db

run away from them when they say that its not possible by any means well mabye if you carpet over the port lmao:naughty:

 

[ThatChevyGuy 5,000+ posts]

i did a 146 with three re series 12''s on a memphis 1000 in a TRUNK car. I think the high tuning helped. I got loudest of the nite, and i had the littlest money into my system. And crx's are LOUD.