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wvsquirrel 
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Posted: September 29, 2003 at 6:56 AM / IP Logged  
a Class D mono amp that is 2ohm stable rated apx. 400 x 1 @ 2ohms and 200 x 1 @ 4ohms. That way you should be right around 300 x 1 @ 3ohms
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Ishinc 
Copper - Posts: 109
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Joined: May 22, 2002
Posted: September 29, 2003 at 8:14 PM / IP Logged  
hey thanks for the clear up! would this be a good amp to use?
Ishinc 
Copper - Posts: 109
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Joined: May 22, 2002
Posted: September 30, 2003 at 11:50 PM / IP Logged  
THANKS i've learned soo much about subs and amps. if the amp is rates 150x2 at 4 ohms would i be able to use both channels for one sub and get 300 at 4 ohms? i think i need 3ohms, how many watts would that calc out to? sorry for the newbie to subs questions
thirdgenaccord 
Member - Posts: 6
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Joined: September 24, 2003
Location: United States
Posted: October 01, 2003 at 2:34 AM / IP Logged  
Ok,
now if you run each channel of a two channel amp
to separate voice coils then the slight variations in the voltage that each channel puts out could damage your sub.
So,
when using a two channel amp it is advised to bridge the amp. In this manner the amp only puts out one channel
thereby eliminating that problem.
Also,
that amp would not be "stable" at such a low impedance.
Amps like all things electrical are only rated to have so much current running through them before they fry and start things on fire. That amp's specifications say that it will put out:
100 Watts through 2 channels with 4 Ohms of impedance.
Now if you lower the amount of resistance that the amp has to overcome, it works more efficiently:
140 Watts through 2 channels with 2 Ohms of impedance.
If you "bridge" the amp (read: put the channels together)
the wattage and the Impedance both double:
280 Watts through 1 channel with 4 Ohms of impedance.
Got it?
If you ask that amp to power your sub at 3 Ohms while bridged it will be trying to push more current than it's rated to push, and could fry.
In terms of your last question you'd be pushing approx. 220 Watts at 3 Ohms.
Does that cover it?
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Ishinc 
Copper - Posts: 109
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Joined: May 22, 2002
Posted: October 02, 2003 at 6:13 PM / IP Logged  
okay i think i'm narrowing down. Will the JL 300/2 bridged to 300W work good for me? or will a monoblock still be better? thanks!
Ishinc 
Copper - Posts: 109
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Joined: May 22, 2002
Posted: October 02, 2003 at 6:20 PM / IP Logged  
when it is bridge it is in mono right? thanks!
nedgeworth 
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Joined: November 03, 2002
Location: Australia
Posted: October 02, 2003 at 7:08 PM / IP Logged  
Yeap that's right. Bridged makes it 1channel which means Mono!
JL3GEclipse 
Member - Posts: 19
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Joined: June 16, 2003
Location: United States
Posted: October 02, 2003 at 7:09 PM / IP Logged  
It is not true that if the terminals are on the same side that it is a single vc sub. On a JL that is especially untrue because the W6 is a dual and it IS on the same side.
I am not sure about the older W6 but the new only comes in dual 4 which means in parallel he would have 2ohms and most
2 channel amps are NOT 2ohm stable when bridged. For this sub get a mono amp for best results.
JL3GEclipse 
Member - Posts: 19
Member spacespace
Joined: June 16, 2003
Location: United States
Posted: October 02, 2003 at 7:15 PM / IP Logged  
also, the 300/2 is not set up to run subs, get the 250/1 unless you plan on running it hard. if you push too hard and it is underpowered you will most likely clip the signal and damage the amp or the sub. if this is the case then go with a 500/1 and you should be fine.
nedgeworth 
Silver - Posts: 264
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Joined: November 03, 2002
Location: Australia
Posted: October 02, 2003 at 7:17 PM / IP Logged  
Thing is it's a 3ohm model sub. So running it in paralell you would require an amp that is 1.5ohm stable. The best thing to do if unsure is write to jl and ask them for the specs of the older model sub that way the choice is easier than having to go on information you think is right.
Everything that has been suggested is approiate depending on the senario. But if you want to get the best choice you'd be best to get some more info out of JL then we can suggest a couple of exact suggestion instead of a broad range of what if's.
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