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Do Subwoofers Lose Power Over Time? Do composite subs like the L7 lose bass over usage

#1 User is offline   protegeboom Icon

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Posted 18 June 2008 - 09:33 AM

I have 4 L7 15 kickers and it seems that 2 of them play stronger than the 2 new ones I have. Is it the voice coils that lose there resilience or is the magnets?
P.S. All 4 are of the same model year and build.
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#2 User is offline   FiBTLforlife Icon

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Posted 18 June 2008 - 09:37 AM

View Postprotegeboom, on Jun 18 2008, 09:33 AM, said:

I have 4 L7 15 kickers and it seems that 2 of them play stronger than the 2 new ones I have. Is it the voice coils that lose there resilience or is the magnets?
P.S. All 4 are of the same model year and build.


i would think that it would be the voice coals but dont take me up on that...ive had some amps do that to me but never a subwoofer.

This post has been edited by FiBTLforlife: 18 June 2008 - 09:37 AM

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#3 User is offline   deafyT Icon

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Posted 18 June 2008 - 09:40 AM

View PostFiBTLforlife, on Jun 18 2008, 09:37 AM, said:

...ive had some amps do that to me but never a subwoofer.


caps inside the amps, like regular batteries, have a limited shelf life.
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#4 User is offline   sactownstang Icon

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Posted 18 June 2008 - 09:44 AM

plus after awhile those caps will leak and trouble will follow!!
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#5 User is online   Team Bassick (ALPINE) Icon

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Posted 18 June 2008 - 09:44 AM

The subs have to break in then they will take more power and might get louder
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#6 User is offline   protegeboom Icon

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Posted 18 June 2008 - 09:45 AM

View Postsactownstang, on Jun 18 2008, 09:44 AM, said:

plus after awhile those caps will leak and trouble will follow!!

I have all new T series amps.
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#7 User is online   wL<3bass Icon

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Posted 18 June 2008 - 09:49 AM

You need to break the subwoofers in.

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#8 User is offline   banginAltima Icon

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Posted 18 June 2008 - 09:55 AM

View Postprotegeboom, on Jun 18 2008, 12:33 PM, said:

I have 4 L7 15 kickers and it seems that 2 of them play stronger than the 2 new ones I have. Is it the voice coils that lose there resilience or is the magnets?
P.S. All 4 are of the same model year and build.


I believe this maybe true... I have two RF T1 15's. They are down almost a full db, 145.5 which I did all the time down to 144.8. I have changed amps, head unit, speaker wire, etc. Still down a db. I check the coils with a ohm meter and they check fine. I have even added another battery. I don't know what else it could be. The box is the same as well as the tuning. I went from a RF T1001bd to another RF T1001bd to a Sundown 1500 and still can't get over a 145 with these subs.
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[BenH] 6:24 pm: clipping doesn't really hurt subs
[BenH] 6:24 pm: being an idiot is what blows subs
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#9 User is online   Team Bassick (ALPINE) Icon

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Posted 18 June 2008 - 09:56 AM

View PostwL<3bass, on Jun 18 2008, 09:49 AM, said:

You need to break the subwoofers in.

Didn't I just say that??? Love it when people ignor the TRUTH preach on brotha
2007 Bass Race San Mateo Regionals 120-129.9 Champ
2007 Bass Race Nationals 120-129.9 2nd Place
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#10 User is online   wL<3bass Icon

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Posted 18 June 2008 - 10:06 AM

View PostTeam Bassick (ALPINE), on Jun 18 2008, 12:56 PM, said:

Didn't I just say that??? Love it when people ignor the TRUTH preach on brotha

Figured if a second person said it he might believe it. ;)

Vehicle: 1997 S10 Blazer 4dr 4X4
Exterior: Rear End Bagged, Black Grill, 5000K 55W Hid Low & Fogs
Amplifiers: Rockford Fosgate T8004 & T10001bd
Batteries: 2 Stinger SPV35, Kinetik HC2400
Electrical: Big 3, DC Power 290amp Alternator w/ MLA at 15.5v
Enclosure: 4.2 ft³ @ 33Hz 84sq.in. of port (20sq.in. per cube)
Headunit: Eclipse CD3200 w/ 80G iPod
Mids/Highs: Rockford T152s (a-pillars), Rockford T162s (doors)
Subwoofers: 1 15" Fi BL Fully Loaded
Wire: All 1/0g Kicker Hyperflex
Future Upgrades: Viper Alarm & 24" Rims & Tires...

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#11 User is online   Team Bassick (ALPINE) Icon

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Posted 18 June 2008 - 10:19 AM

View PostbanginAltima, on Jun 18 2008, 09:55 AM, said:

I believe this maybe true... I have two RF T1 15's. They are down almost a full db, 145.5 which I did all the time down to 144.8. I have changed amps, head unit, speaker wire, etc. Still down a db. I check the coils with a ohm meter and they check fine. I have even added another battery. I don't know what else it could be. The box is the same as well as the tuning. I went from a RF T1001bd to another RF T1001bd to a Sundown 1500 and still can't get over a 145 with these subs.



This is also true when overpowering a sub way over rms and your constanly getting the coils hot after a while the hot then cold then got coils will get weak I say your subs are on there last leg there or the box is no good also makin the coils get hot
2007 Bass Race San Mateo Regionals 120-129.9 Champ
2007 Bass Race Nationals 120-129.9 2nd Place
2007 west coast points Champ
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2008 Bass Race 130-139.9 West Coast Regional 3rd place
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#12 User is offline   deafyT Icon

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Posted 18 June 2008 - 10:22 AM

View PostTeam Bassick (ALPINE), on Jun 18 2008, 09:56 AM, said:

Didn't I just say that??? Love it when people ignor the TRUTH preach on brotha


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#13 User is offline   Kranny Icon

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Posted 18 June 2008 - 10:43 AM

c is for cookie, thats good enough for me *jacks e-cookie*

View PostBulletInjection, on 21 August 2010 - 10:50 AM, said:

Kranny, the creator of threads.

View PostBoon, on 09 March 2010 - 12:16 AM, said:

at the shop I work at we install 1500w systems regularly with nothing more than an upgraded ground from the frame to the battery and I never see them coming back because a black hole has opened up and swallowed their children or something equally terrible...

View PostRed-navi-916, on 08 June 2010 - 12:31 PM, said:

lol orly? thats like saying im going for a walk and getting hit by an air plane am i not correct?


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#14 User is offline   banginAltima Icon

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Posted 18 June 2008 - 03:58 PM

View PostTeam Bassick (ALPINE), on Jun 18 2008, 01:19 PM, said:

This is also true when overpowering a sub way over rms and your constanly getting the coils hot after a while the hot then cold then got coils will get weak I say your subs are on there last leg there or the box is no good also makin the coils get hot


How can my box be no good making the coils hot?
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If you build it, db's will come...

NSPL World Record Holder Trunk 0-1800 watts---147.9 with 1722 clamped watts @ 40Hz(9-20-09).
Competition Only Record Holder Trunk 0-500 watts---148.1

2006 Nissan Altima 3.5 SE
Currently Rebuilding....
My 150db Plus Trunk Build
I do box designs.

Quote

[BenH] 6:24 pm: clipping doesn't really hurt subs
[BenH] 6:24 pm: being an idiot is what blows subs
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#15 User is offline   protegeboom Icon

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Posted 21 June 2008 - 01:35 AM

View PostTeam Bassick (ALPINE), on Jun 18 2008, 09:56 AM, said:

Didn't I just say that??? Love it when people ignor the TRUTH preach on brotha


Doesn't the sundown 1500 have more power than the T1001bd?

If so then the woofers do lose power.
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#16 User is offline   protegeboom Icon

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Posted 21 June 2008 - 01:46 AM

View PostbanginAltima, on Jun 18 2008, 03:58 PM, said:

How can my box be no good making the coils hot?


I believe if the box is not tuned to the frequency of the woofer, such as wrong port length or box too large or too small it will cause the woofer to over work its suspension and overheat the voice coils. It may not have enough back pressure as well.
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#17 User is offline   ISO Icon

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Posted 21 June 2008 - 07:18 PM

I didn't read the other shit much.
Your new L7s need broke in, Thats all.
Only run the new set for 2 weeks and they will sound like the old ones.
The suspension on the L7s is so tight that there is a dramatic difference in sound between a brand new one and a used one.(I know this for a fact)
The new ones will catch up after you get them broke in.
Period

You should be in the Kicker section.

This post has been edited by ISO: 21 June 2008 - 07:18 PM

Isobaric - Refers to the practice of coupling two drivers together to make them act as one.

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#18 User is offline   protegeboom Icon

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Posted 23 June 2008 - 10:43 PM

View PostISO, on Jun 21 2008, 07:18 PM, said:

I didn't read the other shit much.
Your new L7s need broke in, Thats all.
Only run the new set for 2 weeks and they will sound like the old ones.
The suspension on the L7s is so tight that there is a dramatic difference in sound between a brand new one and a used one.(I know this for a fact)
The new ones will catch up after you get them broke in.
Period

You should be in the Kicker section.


Thank u very much, although, I wanted it be a general woofer question and not just about L7 woofers.
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#19 User is online   wL<3bass Icon

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Posted 23 June 2008 - 10:50 PM

View Postprotegeboom, on Jun 24 2008, 01:43 AM, said:

Thank u very much, although, I wanted it be a general woofer question and not just about L7 woofers.

All new woofers will need broken in to some degree..... some will need more time than others.....

This post has been edited by wL<3bass: 23 June 2008 - 10:50 PM


Vehicle: 1997 S10 Blazer 4dr 4X4
Exterior: Rear End Bagged, Black Grill, 5000K 55W Hid Low & Fogs
Amplifiers: Rockford Fosgate T8004 & T10001bd
Batteries: 2 Stinger SPV35, Kinetik HC2400
Electrical: Big 3, DC Power 290amp Alternator w/ MLA at 15.5v
Enclosure: 4.2 ft³ @ 33Hz 84sq.in. of port (20sq.in. per cube)
Headunit: Eclipse CD3200 w/ 80G iPod
Mids/Highs: Rockford T152s (a-pillars), Rockford T162s (doors)
Subwoofers: 1 15" Fi BL Fully Loaded
Wire: All 1/0g Kicker Hyperflex
Future Upgrades: Viper Alarm & 24" Rims & Tires...

Posted Image
Posted ImagePosted Image
Team Deadly Hertz
______________________________
My YouTube Videos
My Fiberglass A-Pillar Build
My "Seamless" Looking Box Build
My DD1508 T-Line Bandpass Build "Seamless" w/ Acrylic Windows (for '05 TrailBlazer)
My Stealth 8" Fiberglass Build (for '05 TrailBlazer)
My Build For A Friend's '08 Cobalt 15" BL Sealed Off From The Trunk
My feedback/references...
0

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