subwoofers dont *boom* at the same time

xJ2daO2daNx · 30th July 2007, 02:54 AM

I have two subs in one box that do not bump at the same time.. i hooked them up separately and one sounds just a little big louder than the other.. any ideas?

OzMikeH · 30th July 2007, 03:32 AM

Your question is like saying " I put a turbo on my truck but it drives funny, why?"

Is it any old speakers in any old box or was it properly designed?

If the former then the news is bad: you need to take it apart, learn about it, think about it and start again before you break something. No-one can help you if it's just random junk thrown together. Have a look at the Wiki section of this site to learn some of the basics, If you do some of your own legwork people will be very happy to help you learn. You might have some really good junk that just needs the right cabinet or you might be better off using the drivers to stick the shopping list to your refrigerator.

If the latter you need to provide a lot more information. Internal dimensions of the cabinet, port dimensions, Driver T/S specs, what filtering you are using to drive them, where in the room it is, how big is the room?

xJ2daO2daNx · 31st July 2007, 09:24 AM

They aren't a bunch of junk put together.. i got the whole set and they used to hit at the same time and everything worked great.. just recently they have stopped hitting at the same time and i have no idea why the sudden change.. do u kno why this would just happen?

AKN · 31st July 2007, 10:04 AM

Hi xJ2daO2daNx,

Have you checked woofer voice coils with an Ohm meter.
Maybe one woofer VC is open and that woofer now acting as a passive radiator.

theAnonymous1 · 31st July 2007, 05:02 PM

Quote:

Originally posted by xJ2daO2daNx
i hooked them up separately and one sounds just a little big louder than the other.. any ideas?

Dual voice coils in parallel ehhh?

xJ2daO2daNx · 31st July 2007, 06:54 PM

how would you fix it if one of the voice coils is stuck open?

theAnonymous1 · 31st July 2007, 07:02 PM

The only way to fix it is to recone the driver. Unless it is a high end driver it probably wouldn't be worth it.

If one of the coils is blown, then the only thing you can really do besides getting a new driver is to disconnect one of the coils on the good driver so they play evenly.

AKN · 31st July 2007, 07:42 PM

Oops, I did obviously not read your first post carefully enough. My assumption was that you had not tested woofers separately, sorry for any confusion.

But if you have dual VC woofers you could have one of the VC's open as suggested by theAnonymous1.

Do you have dual VC woofers?
What kind of woofers do you have?

You could also have some shorted turns in the voice coil of the woofer that has the lowest output. (This applies whenever you have dual or single VC woofers.)
Check Re of every coil with a DVM and confirm that the values are fairly close and that no VC is open circuit.

30th July 2007, 02:54 AM	#1
xJ2daO2daNx diyAudio Member Join Date: Jul 2007	*subwoofers dont boom* at the same time** I have two subs in one box that do not bump at the same time.. i hooked them up separately and one sounds just a little big louder than the other.. any ideas?

31st July 2007, 10:04 AM	#4
AKN Enjoy good sound diyAudio Member Join Date: Aug 2005 Location: In the middle of Sweden	Hi xJ2daO2daNx, Have you checked woofer voice coils with an Ohm meter. Maybe one woofer VC is open and that woofer now acting as a passive radiator. __________________ / Anders

31st July 2007, 07:02 PM	#7
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	The only way to fix it is to recone the driver. Unless it is a high end driver it probably wouldn't be worth it. If one of the coils is blown, then the only thing you can really do besides getting a new driver is to disconnect one of the coils on the good driver so they play evenly. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

31st July 2007, 07:42 PM	#8
AKN Enjoy good sound diyAudio Member Join Date: Aug 2005 Location: In the middle of Sweden	Oops, I did obviously not read your first post carefully enough. My assumption was that you had not tested woofers separately, sorry for any confusion. But if you have dual VC woofers you could have one of the VC's open as suggested by theAnonymous1. Do you have dual VC woofers? What kind of woofers do you have? You could also have some shorted turns in the voice coil of the woofer that has the lowest output. (This applies whenever you have dual or single VC woofers.) Check Re of every coil with a DVM and confirm that the values are fairly close and that no VC is open circuit. __________________ / Anders

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

30th July 2007, 03:32 AM	#2
OzMikeH diyAudio Member Join Date: Mar 2007	Your question is like saying " I put a turbo on my truck but it drives funny, why?" Is it any old speakers in any old box or was it properly designed? If the former then the news is bad: you need to take it apart, learn about it, think about it and start again before you break something. No-one can help you if it's just random junk thrown together. Have a look at the Wiki section of this site to learn some of the basics, If you do some of your own legwork people will be very happy to help you learn. You might have some really good junk that just needs the right cabinet or you might be better off using the drivers to stick the shopping list to your refrigerator. If the latter you need to provide a lot more information. Internal dimensions of the cabinet, port dimensions, Driver T/S specs, what filtering you are using to drive them, where in the room it is, how big is the room?

31st July 2007, 09:24 AM	#3
xJ2daO2daNx diyAudio Member Join Date: Jul 2007	They aren't a bunch of junk put together.. i got the whole set and they used to hit at the same time and everything worked great.. just recently they have stopped hitting at the same time and i have no idea why the sudden change.. do u kno why this would just happen?

31st July 2007, 06:54 PM	#6
xJ2daO2daNx diyAudio Member Join Date: Jul 2007	how would you fix it if one of the voice coils is stuck open?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Hi-Fi Stereo went BOOM	nfm	Parts	33	4th September 2009 02:26 PM
trick behind the boom box	ravslanka	Subwoofers	13	17th January 2009 10:46 PM
best boom for the buck?	peace brainerd	Subwoofers	10	15th December 2005 09:56 PM
Kenwood KAC 820 Amp went Boom!	sidskiba	Car Audio	8	3rd December 2004 05:58 AM
R/Boom correction	timolien	Multi-Way	1	7th July 2003 02:38 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read