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Old 10-15-2010, 02:31 AM   #1
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Default Sub and Amp Wiring

So I just picked up a JL Audio 250/1 Mono block amp. I currently have an Infinity 10" 1052w DUAL VOICE COIL Subwoofer 250w RMS. So I figured this amp would match my RMS rating perfectly, or at least as good as it will get.

Currently I have the sub wired independently. So by that I mean, on the amp itself there are two sets of positive and negative sub out terminals, and I have each set of terminals on the amp running to 1 set of terminals each on the sub. According to JL this is called independent wiring. Now the amp itself operates at full potential from 1.5 ohms to 4 ohms so my first question is how many ohms am I operating at with this wiring setup? Is it 4 ohms? Would it be better to wire it in parallel to achieve 2 ohms? How would I do that with this amp that has 2 sets of terminals?

AMP+ ~~~~~~~~ +SUB
AMP- ~~~~~~~~~ -SUB
AMP+ ~~~~~~~~ +SUB
AMP- ~~~~~~~~~ -SUB


Help would be greatly appreciated, I know the people of this forum have helped me many times in the past.
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Old 10-16-2010, 01:05 PM   #2
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I forgot to mention the sub is dual 4 OHM voice coil.
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Old 10-16-2010, 02:15 PM   #3
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If the sub is dual 4 ohms that means each channel of the amp is dealing with 4 ohms of resistance. u could wire up the sub to a single 2 ohm load and bridge the amp to the sub for the most power.
That sound be a nice sound quality set up..
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Old 10-17-2010, 04:58 PM   #4
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What I ended up doing is exactly as that picture I attempted to make on my first post. I forgot that the amp I have (JL 250/1) actually is already bridged internally. So I just sent a set of positive and negative wires from the sub ( 2 sets) to the 2 sets of terminals on the amp and it bridged it for me for a 2 ohm load.

Thanks though I appreciate the response, and yes it sounds absolutely amazing. Great sound quality and clarity. But I have to figure out what the set the adjustments at because I occasionally listen to techno and sometimes with particular songs the bass just doesn't sound right. But with every other genre of music it'* great.
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Old 10-17-2010, 07:30 PM   #5
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if u listen to techno turn the lpf frequeny up a little so ur sub will hit the higher bass also.. if ur box is ported make sure to set ur sub sonic filter at about 30 hz or so
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Old 10-17-2010, 08:42 PM   #6
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I have a sealed box and the filter frequency is at 30hZ so should i just turn it off? The LPF is at 65-70hz which is nice and snappy for the hardcore I listen to and rap is just fine
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Old 10-17-2010, 09:07 PM   #7
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Yup.. all sounds good. U dont need sub sonic filter on if ur box is sealed. Just keep toying with the settings on ur deck until it fits ur taste
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Old 10-17-2010, 09:24 PM   #8
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Quote:
Originally Posted by raptor660 View Post
if u listen to techno turn the lpf frequeny up a little so ur sub will hit the higher bass also.. if ur box is ported make sure to set ur sub sonic filter at about 30 hz or so
Turning up the LPF won't increase the higher bass freq. response, all it does is cut off the frequency to amp will send to the sub higher. So instead of playing down to 30Hz, it'll only go as low as 50Hz, for example.

The box and resonant frequency of the car will be the determining factor as to how high the subs will play.

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Originally Posted by Kurisu_Sand View Post
I have a sealed box and the filter frequency is at 30hZ so should i just turn it off? The LPF is at 65-70hz which is nice and snappy for the hardcore I listen to and rap is just fine
You can turn the subsonic filter off since your subs are in a sealed box. The SS filter is for use with ported boxes.
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Old 10-18-2010, 11:51 AM   #9
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Great thanks everyone I appreciate all the input I'll keep my LPF around 70 or so just so it covers a wide variety of frequencies. On my deck I have the four speakers running at an LPF of 125 with lows turned down to add some life to them I'll turn off the as filter. Thanks again
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Old 10-18-2010, 06:45 PM   #10
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Quote:
Originally Posted by 04MonteLS View Post
Turning up the LPF won't increase the higher bass freq. response, all it does is cut off the frequency to amp will send to the sub higher. So instead of playing down to 30Hz, it'll only go as low as 50Hz, for example.

The box and resonant frequency of the car will be the determining factor as to how high the subs will play.

You can turn the subsonic filter off since your subs are in a sealed box. The SS filter is for use with ported boxes.
I must have been super high last night in order to make a statement like that cause turning up the LPF ABSOLUTELY increases the freq. response of your subs as the point at which it'* set is the highest frequency the amp will send to the subs.
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