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Old 24th May 2008, 08:24 PM   #1
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Default 4ohm Resistance

Hey, I have a logitech x230 (4 ohm) home theatre sub, and my bro brought in his 12" Infinity reference sub (4 ohm), and I decided to connect the 12" infinity, which i have, I have connected it from the logitech x230's little 4inch sub so both are on, they are not in series but in parrarel.

is this safe to do or will it fry the amp? so far its fine.

If its not okay im happy to dissconnect the 4inch sub and let the 12" get another 10 watts.

The x230 delivers 20 watts to the 4 inch sub, since ive connected the 12" im guessing its sharing 10 watts each, i know the 12" is being seriouslly underpowered by about 590 watts but its ok i suppose, i dont mind giving it another 10 watts.

so what do you think. later on i will be buying a logitech z-5500 which comes with a 10" driver with about 188 watts, which should be enough to satisfy me and my home theatre ways.
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Old 24th May 2008, 09:09 PM   #2
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2x 4ohm speakers in parallel is a 2ohm load. Probably a bit low for your amp.

I'd run only one 4 ohm speaker at a time,just to be easy on the little amp.
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Old 24th May 2008, 09:13 PM   #3
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It's probably not safe to parallel another woofer onto the amp unless the x230 had a set of speaker output terminals designed to accept a second 4 ohm woofer.

The wattage isn't shared. The amp is probably producing nearly double the original power. Disconnecting the original woofer probably won't cause significantly more power to go to the other woofer but it will allow the internal amp to operate into a safe load.
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Old 25th May 2008, 09:32 AM   #4
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thanks people, ill see how it runs with 1x 12", if its not as good as with 1 4" then ill just discconect the 12.

thanks again.
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Old 25th May 2008, 12:40 PM   #5
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Edit: It went well! I disconnected the 4" which made the clipping go (when i reached high volumes) so right now its got 4ohm and the 12" actually sounds louder and the quality has been increased, thanks people for the help i appreciate it. of course though the 12" is being highly underpowered but its better then the 4" it moves much more air, not to much flex though.
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Old 26th May 2008, 06:36 AM   #6
luka is offline luka  Slovenia
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if sub has 2x4R then each coil will take 1/2 rated power only, so watch for this, if you use only one
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
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Old 26th May 2008, 08:41 AM   #7
Dan2 is offline Dan2  South Africa
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why not get a smaller (and cheaper) sub. a friend of mine bought a really cheap 10" car sub and could run it into distortion with a 30w rms amp. sound quality is not fantastic, but it's probably the best you are gonna get from your 20W amp.
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Old 26th May 2008, 09:35 AM   #8
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Yeah i was thinking about that, smaller sub would take less power to punch, but then again its a smaller surface area.. I might get the 8" version of my sub that takes up to about 200w max, or i might just get the logitech z-5500 that comes with a 10" logitech driver, if im still not satisfied i can get a infinity 10" 8ohm (z-5500 takes 8ohm) and see how better it would be for the infinity 10" takes 188 watts rms instead of the cheap logi driver that comes with it.
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