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ohm load do i have a clue?


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gtdhw 
Member - Posts: 26
Member spacespace
Joined: November 26, 2010
Location: Indiana, United States
Posted: November 26, 2010 at 12:15 PM / IP Logged  

Hello all, first post.

I have been surfing the web in a car audio crunch course for the last few days. I feel I have a decent grasp on it for the most part, but I still have a few questions about ohm's that I cannot find straight anwers for. Any/all help will be greatly appreciated.

This is what I am dealing with

ohm load do i have a clue? -- posted image.

Just your average 12 second station wagon.
sq1500 
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Joined: November 22, 2010
Location: New Hampshire, United States
Posted: November 26, 2010 at 12:35 PM / IP Logged  
you are correct on the left one. combining the two 8 ohm subs in parallel will igve you a 4 ohm load. if you were to wire them together in series you would get a 16 ohm load. since you will be paralleling them, that will put a 4 ohm load on your amp at which the amp IS stable at 4 ohms bridged, which is what you want to do. you are no correct on the diagram on the right. since you are putting one sub on one channel and the other on the other channel. the ohm load of the subs will be whatever you put onto that channel. so the sub is 4 ohms and you put it to one channel. that one channel will see 4 ohms
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gtdhw 
Member - Posts: 26
Member spacespace
Joined: November 26, 2010
Location: Indiana, United States
Posted: November 26, 2010 at 12:54 PM / IP Logged  

sq1500 wrote:
you are correct on the left one. combining the two 8 ohm subs in parallel will igve you a 4 ohm load. if you were to wire them together in series you would get a 16 ohm load. since you will be paralleling them, that will put a 4 ohm load on your amp at which the amp IS stable at 4 ohms bridged, which is what you want to do. you are no correct on the diagram on the right. since you are putting one sub on one channel and the other on the other channel. the ohm load of the subs will be whatever you put onto that channel. so the sub is 4 ohms and you put it to one channel. that one channel will see 4 ohms

Ok then, if I hooked up two 4 ohm subs in stereo, the amp would be running an 8 ohm load? 4 ohm per channel?

Just your average 12 second station wagon.
sq1500 
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Joined: November 22, 2010
Location: New Hampshire, United States
Posted: November 26, 2010 at 12:57 PM / IP Logged  
yes 4 ohm load per channel which that amp is capable of. but no the amp wont run at an 8 ohm load because they are each their own seperate channel. the channels are only connected together when you bridge them.
JL HD 1200.1 $700
JL HD 600.4 $500
TWO (2) JL 8W7 $600
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gtdhw 
Member - Posts: 26
Member spacespace
Joined: November 26, 2010
Location: Indiana, United States
Posted: November 26, 2010 at 1:12 PM / IP Logged  

sq1500 wrote:
yes 4 ohm load per channel which that amp is capable of. but no the amp wont run at an 8 ohm load because they are each their own seperate channel. the channels are only connected together when you bridge them.

Thanks for the help!

So, if I understand, I can run a 2 ohm sub to each channel. That would put me in 2 ohm stereo (putting 190rms to each sub) which the amp is stable at?

I could also run a 4 ohm sub to each channel. That would put me in 4 ohm stereo (putting 125 rms to each sub) which is less power, but stll safe?

I could also bridge two 8 ohm subs. That would put me in 4 ohm bridged (putting 190rms to each sub) still safe and the exact same power as running a 2 ohm to each channel?

Just your average 12 second station wagon.
sq1500 
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Member spacespace
Joined: November 22, 2010
Location: New Hampshire, United States
Posted: November 26, 2010 at 1:16 PM / IP Logged  
correct
JL HD 1200.1 $700
JL HD 600.4 $500
TWO (2) JL 8W7 $600
pm me
gtdhw 
Member - Posts: 26
Member spacespace
Joined: November 26, 2010
Location: Indiana, United States
Posted: November 26, 2010 at 1:19 PM / IP Logged  

....and, if I ran two 8 ohm subs in stereo (one to each channel) the amp would be running 8 ohm per channel. Making the output 75wx2 rms?

No reason for me to do it this way, just wanting to know that I fully understand the concept.

Just your average 12 second station wagon.
gtdhw 
Member - Posts: 26
Member spacespace
Joined: November 26, 2010
Location: Indiana, United States
Posted: November 26, 2010 at 1:22 PM / IP Logged  

sq1500 wrote:
correct

Thanks again for taking the time to help a guy out.

Here is another question, would it sound better to run two 200/400 subs @ 190/360, or run one 400/800-500/1000 sub (same size) @ 380/760?

Just your average 12 second station wagon.
sq1500 
Member - Posts: 12
Member spacespace
Joined: November 22, 2010
Location: New Hampshire, United States
Posted: November 26, 2010 at 1:24 PM / IP Logged  
no it would be this
two 8 ohm subs
190Wx2@2ohms
so
190W @ 2ohm per sub
95W @4ohm per sub
47.5W @8ohm per sub
JL HD 1200.1 $700
JL HD 600.4 $500
TWO (2) JL 8W7 $600
pm me
sq1500 
Member - Posts: 12
Member spacespace
Joined: November 22, 2010
Location: New Hampshire, United States
Posted: November 26, 2010 at 1:28 PM / IP Logged  
SOUNDING better doesn't rely on how much power you're putting out. SOUNDING better relies on sound quality worthy subs, amps, processors, head units, boxes, tuning, etc. what you are asking is based on what will be louder. in which the 400/800 would be fine for that 300 or so watts
JL HD 1200.1 $700
JL HD 600.4 $500
TWO (2) JL 8W7 $600
pm me
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