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bad sub sound


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dirt_jumper54 
Member - Posts: 32
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Joined: July 20, 2005
Location: Canada
Posted: October 13, 2005 at 7:01 PM / IP Logged  
ok heres the deal i just got a used orion cobalt cs12d of a friend and hooked it up in my car. it worked fine in my friendds car before. now there is some bad sounds coming from it:
1. it sounds almost echoy
2. theres kind of a cone distorting sound
3. the sub makes a noise almost like it is hitting something
4. my 10" hits as hard (the orion was pounding in my friends car off less power)
ive tried reversing the polarity, inverting the sub(thats the way my friend had it), i took a good look at it and it seems ok. the cone isn't cracked, creased and the surround is good.
what can be causing this problem?
skoldspuppy 
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Posted: October 13, 2005 at 10:00 PM / IP Logged  

dirt_jumper54 wrote:
1. it sounds almost echoy
2. theres kind of a cone distorting sound
3. the sub makes a noise almost like it is hitting something
4. my 10" hits as hard (the orion was pounding in my friends car off less power) 
1. What size is the box? Is it sealed , ported, BP etc.. it could be way to big for the woofer that can sometimes cause a boomy/echoy sound
2. Could be a damaged Voice Coil, check the impedence of the sub with a DMM
3. Sounds like its bottoming out, possiably a box issue IE: to big or to small
Just some things to ponder
--Skold

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Steven Kephart 
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Posted: October 13, 2005 at 10:51 PM / IP Logged  
I'd also recommend checking the amplifier gain and bass boost settings.  A clipped signal can sound oddly mechanical.
blackmica3 
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Joined: August 07, 2005
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Posted: October 13, 2005 at 11:26 PM / IP Logged  
My first guess when I first read this was a bad voice coil. As said above, check the impedance.
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: October 14, 2005 at 12:33 AM / IP Logged  

Steven Kephart wrote:
I'd also recommend checking the amplifier gain and bass boost settings.  A clipped signal can sound oddly mechanical.

Do this first!

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dirt_jumper54 
Member - Posts: 32
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Posted: October 14, 2005 at 9:59 AM / IP Logged  
the box is not to big the recommened ported size is 2ft mine is 1.75. the problem is kind of solving itself its not half as bad today as it was yesterday. the amp was working fine with my other sub. 
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: October 14, 2005 at 12:00 PM / IP Logged  

dirt_jumper54 wrote:
the box is not to big the recommened ported size is 2ft mine is 1.75. the problem is kind of solving itself its not half as bad today as it was yesterday. the amp was working fine with my other sub. 

Problems that "solve themselves" were generally not problems to begin with... but back to the issue: how did you set your gain and are you using any "bass boost"?  If you changed subs, did you change impedance loading on the amp?  And are you sure the sound you're hearing is not simply because your new sub sounds different from your old one?

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dirt_jumper54 
Member - Posts: 32
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Posted: October 14, 2005 at 12:32 PM / IP Logged  
ok there is no bass boost on my amp (its really old) my gain is about 1/3 up. i am runnig at 2ohms now. previously is was running a 10" mtx thunder 6000 8ohm svc with the gain pretty much cranked. i can accually hear the sub moving (its hard to explain) its not a bass sound its like i can hear the vc moving. this sub pounding unbelievably hard in my friends car which is about the size as mine and there both hatchbacks off the same amp. also if this effects anything my box is ported really low like 30hz or so could this be my problem?
audiointl 
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Posted: October 20, 2005 at 4:49 AM / IP Logged  

Just because you are running @ 8ohms DOES NOT mean you need to jack up the gain level.  You should:

a.)  get some NEW 4ohm subs                             b.)  get ANOTHER matching sub (somewhere)

c.)  buy a newer amp with higher power rating

d.)  A and C

Whichever you choose, you'll be glad you did.

Everything I touch turns to ICE
dirt_jumper54 
Member - Posts: 32
Member spacespace
Joined: July 20, 2005
Location: Canada
Posted: October 20, 2005 at 11:17 PM / IP Logged  
i know what the problem is now. the amp is just a pice of sh*t and only works good when it wants to. some times it works ok and others it just feeds a bunch of distortion. so im just just shell out the cash for a new amp. the reason i has the gain so far up at 8ohms is i still had no distortion. but when i started runnig it at 2ohms i got distortion at about 1/2 gain so i set it lower. im runnig it off one channel(instead of bridged)right now at 2ohms and it sounds ok but there is only 75 rms going to the sub so its pretty quiet.
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