Woofers (first ones, need some help) - Realm of Excursion



Subwoofers Discuss anything about subwoofers.

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Old 02-21-2007   #1 (permalink)
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Default Woofers (first ones, need some help)

Ok, so I have gotten myself two Urban audio Works 8" woofers. Now, I am fairly new to all this audio stuff, although I know enough to get myself by for the most part, however I seem to have gotten myself into a tangle.

As soon as I saw the words "super bass woofer" on the back of the magnet, I figured these where basically big piles of garbage, however I could not be sure, so that is why I am here.

In your past experiences, is UAW a reputable company or no? I am currently running them off of an old Akai stereo reciever, 200 watt max at 4 ohm...if this is a no no tell me now So far they sound decent, however one sounds as if it has a blown voice coil. I would say that it definitaly does, however I have a feeling that the foamy (probably not the correct term, but the rolled foam surround at the edge of the cone) may be the culprit as it is damaged. When I push straight in on the woofer, I get a sort of grinding noise, however if I grab it from the front and underside (pinching it) and pull it over to one side, and then move it up and down, no grinding noise. Would a new foam surround fix my problem?


Last question.
These are free air subs, so they are meant to be mounted on an infinite baffle (correct?), but will it hurt them to install them in a box, whether it be sealed or ported or any other sort?


Thanks for your time, and sorry for the mile long post
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Old 02-21-2007   #2 (permalink)
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Urban isnt known for being the best...sorry.

Sounds like you have a fried coil.

I wont hurt to put them in a box until you can save up for some better woofers.

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Old 02-21-2007   #3 (permalink)
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So if you figure the coil is fried, why would it not have the "scratchy" sound if I move the cone over to one side if you will, or just put pressure on it in a certain spot, then push (such as pushing with one finger on one side)?
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Old 02-21-2007   #4 (permalink)
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go to bestbuy or circuit city and do the same with some sony or kickers
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Old 02-21-2007   #5 (permalink)
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I assume you mean buy some new woofers to replace the current ones?


If so, that is not exactly an option at the current time as I am on a tight budget.
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Old 02-21-2007   #6 (permalink)
 
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Quote:
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So if you figure the coil is fried, why would it not have the "scratchy" sound if I move the cone over to one side if you will, or just put pressure on it in a certain spot, then push (such as pushing with one finger on one side)?
The cone is most likely not centered in the gap on the magnet, and is rubbing on the sides.
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Old 02-22-2007   #7 (permalink)
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The cone is most likely not centered in the gap on the magnet, and is rubbing on the sides.

Ahhh, that is what I want to hear. Is it likely that that can be corrected with a new rolled foam surround?
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Ahhh, that is what I want to hear. Is it likely that that can be corrected with a new rolled foam surround?
Possibly. Check and make sure that the basket isn't twisted. This can happen to cheaper subs that have weaker baskets.

Unless the surround is seriously deformed, I don't see it affecting how the sub is centered.
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Old 02-22-2007   #9 (permalink)
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Quote:
Originally Posted by Phoenix View Post
Possibly. Check and make sure that the basket isn't twisted. This can happen to cheaper subs that have weaker baskets.

Unless the surround is seriously deformed, I don't see it affecting how the sub is centered.

I doubt the basket is bent out of shape, it is decently beefy steel as far as I can tell.


I took it to school and got my local audio guy to look at it. He said that when you push down on the spider and not the cone it does not make any grinding noise, so he figures it can be fixed by a new foam surround. He took it home to get his father to look at it and give me a final answer, so I guess I will know for sure by tomorrow.
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Old 02-22-2007   #10 (permalink)
 
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If you push on the cone of MOST subs that are not hardcore awesome, you will get a slight scratching or scraping sound. Push on the cone in the CENTER, straight down and if it scratches, its most likely a fried coil. Even if it is not I BET getting a new surround wont help seeing as the spider is its main suspension.
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Old 02-22-2007   #11 (permalink)
 
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Quote:
Originally Posted by durtbagg16 View Post
If you push on the cone of MOST subs that are not hardcore awesome, you will get a slight scratching or scraping sound. Push on the cone in the CENTER, straight down and if it scratches, its most likely a fried coil. Even if it is not I BET getting a new surround wont help seeing as the spider is its main suspension.
Right on the damn money...
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Old 02-22-2007   #12 (permalink)
 
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I would say sell em on ebay :]
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Old 02-22-2007   #13 (permalink)
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Quote:
Originally Posted by durtbagg16 View Post
If you push on the cone of MOST subs that are not hardcore awesome, you will get a slight scratching or scraping sound. Push on the cone in the CENTER, straight down and if it scratches, its most likely a fried coil. Even if it is not I BET getting a new surround wont help seeing as the spider is its main suspension.

When I push directly in the center of the good sub, I get no noise what so ever. When you push in on the center of the bad one, you get a noise, but it is not completely disgusting (more than it should be for sure though).


When you push on the spider only, the noise is gone all together.
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Old 02-22-2007   #14 (permalink)
 
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does the magnets have holes in them for cooling ? and u said they wasnt in a box may be something is in side off 1 of them rubbing on the coil
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Old 02-22-2007   #15 (permalink)
 
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hmm, it really does sound like that coil could be a little messed up. I've just never heard of a foam surround affecting the Speaker like that.
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Old 02-24-2007   #16 (permalink)
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Quote:
Originally Posted by Phoenix View Post
hmm, it really does sound like that coil could be a little messed up. I've just never heard of a foam surround affecting the speaker like that.

Its got multiple holes in it, one of which is rather large.


Quote:
Originally Posted by blockbeata07
does the magnets have holes in them for cooling ? and u said they wasnt in a box may be something is in side off 1 of them rubbing on the coil

Nope, no holes in the magnet.

Nothing could get in at the voice coil regardless of whether it was in a box or not, the spider and dust cap stop any dirt or other particles from getting at the coil.
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