blown sub

[jakebf2 10+ year member]

i just put my subs(2 Dual* 8ohm svc and an infinity 4 ohm dvc) into a new box with a new amp(1200watt kenwood 900watt rms max) and one blew i was thinking maybe it is because it was sealed and would a sealed box effect a speakers ability to be blown if its too small of space? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

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[plugitin 5,000+ posts]

3 different subs (well 2 technically) in the same box and on the same amp? Not a good idea...

 

[csu87 10+ year member]

it blew because you are a moron but now you know.

 

[thundercat 10+ year member]

typically different impedence woofers on the same airspace always looses the lower impedence woofers 1st

 

[jakebf2 10+ year member]

well one box all seperate air spaces and it was one of the 8 ohm one's that blew not the 4 ohm wired in series with itself to a 8 ohm load

 

[csu87 10+ year member]

well one box all seperate air spaces

doesnt matter, you had 2 different types of sub to one amp. general rule is only run 1 size/kind of subs and only 1 voice coil configuration.

 

[plugitin 5,000+ posts]

yeah, not a good idea to run different subs, at all. And no, a sealed box should not blow a sub...i bet you had them wired to the amp all weird and ran at a low load to the amp. therefore producing more power and fried a sub, and i wouldn't be surprised if the amp blew too...stick with one brand and size of subs, and make sure you wire them right...

 

[jakebf2 10+ year member]

no its all wired good. the 2 8ohms were in parallel with each other and the single 4 ohm in series. so i took the broken speaker out and now i just have a single 8 ohm and that 4 ohm wired the same and sound great still just minus one speaker.

 

[audioholic 5,000+ posts]

How was a single voice coil speaker wired in series?

 

[csu87 10+ year member]

dont do that. do you not listen. running 2 different voice coil configurations is bad for the subs and amp.

 

[audioholic 5,000+ posts]

dont do that. do you not listen. running 2 different voice coil configurations is bad for the subs and amp.

So you think an amp will see a difference between a svc 4ohm sub, and two 8ohm subs wired in series?
Running different subs is (almost) always a bad idea... but lets at least give some plausible reasons why. Especially if you are gonna call people morons.

 

[csu87 10+ year member]

yeah 2 8ohm will wire down to 4ohms then you can wire in the 4ohm but its probably not going to work. the different coils will get different amounts of power and more then likely will result in a failure.

lets say his amp will do 1000watts at 2ohms. each speaker isnt going to get a third of that. most likely the 4ohm will more and the other 2 will get whats left. electricity flows through the path of least resistance and 4ohms is less then 8ohms, so more power will flow towards the 4ohm coil

dont know if that helps any

 

[audioholic 5,000+ posts]

dont do that. do you not listen. running 2 different voice coil configurations is bad for the subs and amp.

yeah 2 8ohm will wire down to 4ohms then you can wire in the 4ohm but its probably not going to work. the different coils will get different amounts of power and more then likely will result in a failure.
lets say his amp will do 1000watts at 2ohms. each speaker isnt going to get a third of that. most likely the 4ohm will more and the other 2 will get whats left. electricity flows through the path of least resistance and 4ohms is less then 8ohms, so more power will flow towards the 4ohm coil

dont know if that helps any

You are confused. My point was you keep saying its bad for the amplifier, its not. Its bad acoustically, but to an amplifier its 4ohms, no matter if its a single 4ohm SVC or 100 speakers wired up together to a final load of 4 ohms. You can have an SVC 4ohm speaker wired to one channel of your amp, while having two 8ohm speakers wired in parallel to the other channel. You are correct in that the SVC 4ohm will receive half the power, while the other two 8ohm units receive 1/4 of the power each. But you are incorrect that this is bad for the equipment.