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fried some subs, wiring?


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def by 20 
Member - Posts: 28
Member spacespace
Joined: December 07, 2009
Location: North Carolina, United States
Posted: January 19, 2010 at 6:39 PM / IP Logged  
Me and my cousin bought some used mtx 4500's and thunder x's last weekend along with a 4 sub box. He hooked up a svc 4500 in his truck it it's doing good. I on the other hand fryed both of my thunder x's today. The first I wired like an svc which I just found out was ok as long as half the power was used. It blew in less than a minute. The other I wired parallel at the amp and voice coils and blew at the same volume and as quick as the other sub. I'm running a jl 1000/v1 and the volume was 20 out of 50 with the bass at 0 between -6 and +6. Was I running too much power? My cousin's were hitting much harder than mine. Also, the other 4500 is a dvc and he doesn't know if he can use a svc and dvc with the same amp.
Jensen VM9214 Flip out, JVC 6x9's,Sony 6x9's Pioneer 6x9's, 2 Alpine Type R's in ported box, JL 1000/1 V2 Slash, Sony GTX6040 240 watt amp, Kicker CVR(Black), Alpine 500 (300) watt amp.
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: January 19, 2010 at 7:33 PM / IP Logged  
Too much power. Guaranteed.
1: You can't say it was such-and-such-out-of-so-many, it means ZERO in the big scheme of things. (Actually, it means zero, EVERYWHERE... big scheme, little scheme... Z-E-R-O.) You blew the drivers, because you were running too much power. SOMETHING was incorrectly adjusted.
2: When you wire one woofer one way, you MUST wire the other woofer the same way. If not, you run the very good risk of overpowering one and not the other: if your impedances are not equal, the power is not shared equally. If one woofer (one of two voice coils) is wired a 4 ohms, and the other (both coils, for example, wired in series) for 8 ohms, the 4 ohm coil will be receiving TWICE THE POWER of the other woofer, even though the output of the two woofers will be identical. That's why you (and this is the correct spelling of the word) fried one woofer first, then the other. Once one is gone, the impedance changes, and the amplifier then makes all of it's power into one woofer. Lesson here? DON'T DO THAT AGAIN!
3: You CAN run one DVC and one SVC woofer on one amplifier, as long as the net impedance of the woofers is the same. I mean that the DVC woofer must the same impedance as the SVC woofer when either one VC is used, or both VCs are used, either wired in series or in parallel.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
def by 20 
Member - Posts: 28
Member spacespace
Joined: December 07, 2009
Location: North Carolina, United States
Posted: January 19, 2010 at 10:58 PM / IP Logged  
Thanks for the info. I wasn't clear in my first post but I only ran 1 sub at a time. The first was only wired with one voice coil and the second was wired parallel with both. So are the subs trash? I can't even push the face down.
Jensen VM9214 Flip out, JVC 6x9's,Sony 6x9's Pioneer 6x9's, 2 Alpine Type R's in ported box, JL 1000/1 V2 Slash, Sony GTX6040 240 watt amp, Kicker CVR(Black), Alpine 500 (300) watt amp.
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: January 19, 2010 at 11:48 PM / IP Logged  
If they won't move, they're trashed.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
soundnsecurity 
Gold - Posts: 2,711
Gold spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: November 10, 2008
Location: Louisiana, United States
Posted: January 20, 2010 at 1:03 PM / IP Logged  
i have learned over time that you cant put a cheap sub on a JL 1000/1. i wouldn't put anything on that amp that isn't rated for about 1500W rms or more.
incognyto 
Copper - Posts: 64
Copper spacespace
Joined: December 26, 2009
Location: British Columbia, Canada
Posted: January 24, 2010 at 1:40 AM / IP Logged  
my bro just got a 1000/1 and 2 10" w3's (300 watt's rms a piece) and the gain's are super low!! they start distorting before the amp even breaks a sweat!! series/parallel wiring should be taught in school!! (spelling?) haha or ohms law anyways.

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