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L7 Subwoofer & Resistor maybe?


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Aschaffer 
Member - Posts: 25
Member spacespace
Joined: January 27, 2004
Location: United States
Posted: August 16, 2005 at 10:50 PM / IP Logged  
OK what I have is 2 L7 subwoofers, that are rated at dual 4 ohm voice coils.  Yet they read on my meter at a little over 5 ohms each coil, on both subs.  So once paralleled together at the amp they are reading 2 ohms exactly.  And im using the kicker SX1250.1 amp, which goes down to 1ohm, which is what these speakers should be down to, yet arent.  Is it possible to run a resistor in here and if so how, because I tried running another 2 ohm resistor in parallel bridging it across the positive and neg. lead just to see what would happen and that resistor fried in 2 seconds.  Any ideas..?  I called kicker and they wanted me to RMA the subs, yet my only problem with this is that my friend got the same subs I have but havent installed them yet, and his subs read the same ohm loads.  And also, yes I have tried another meter, and they both read the same loads, so its not a faulty meter  Any help anyone?  Thanks ahead of time!!
shiftmx11 
Member - Posts: 27
Member spacespace
Joined: June 03, 2005
Location: United States
Posted: August 16, 2005 at 11:46 PM / IP Logged  
if your specker is flip upside down and the surround is pushing on the cone alittle that could be giving you a false reading
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: August 17, 2005 at 12:30 AM / IP Logged  
shiftmx11 wrote:
if your specker is flip upside down and the surround is pushing on the cone alittle that could be giving you a false reading
Only if the cone is MOVING or IN MOTION. If it is stationary, there is no difference if it is touching the surround or not, or pushed all the way in...
As far as using a resistor, wherever you add a resistor, you are going to be consuming power that could be used to drive your woofer. Don't do it. Leave the woofer voice coils wired in parallel, hook them to the amplifier, and forget about it.
A 4 ohm woofer will NEVER land on 4 ohms with a DCR setting on a volt meter, this is because 4 ohms is the IMPEDANCE of the woofer - a complex electrical resistance presented to the amplifier when it is producing an AC output - and is a combination of DCR, inductance and capacitance. They are 4 ohm woofers or voice coils. Forget what the meter is telling you, you are loading the amp as far as you can by paralleling all available voice coils... four 4 ohm voice coils in parallel is a one ohm load, presented to the amplifier.
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."
Aschaffer 
Member - Posts: 25
Member spacespace
Joined: January 27, 2004
Location: United States
Posted: August 17, 2005 at 8:54 AM / IP Logged  
So even though the reading is saying 2 ohms, which then my amp will only provide 625 watts, your saying that it is truly providing the full 1250 at 1 ohm?

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