 | Home > In Car Electronics > 8" passive sub advice needed |
 
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| farmer giles Member Since: 09 Feb 2011 Location: worcestershire Posts: 1299  
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i need to replace my old knackered 8" clarion sub.
the replacement needs to be 8" and round (fits in the top of my cubby box). it will be powered by a jensen amp (that will just power the sub, other components powered by headunit). the amp says 75 watts, 300 watts max and i have 100-150 to spend. i've been looking at JL, Focal and Hertz but i'm struggling to understand anything technical - ohms, voice coil etc. all advice gratefully received |
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6th Nov 2013 4:42pm |
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| farmer giles Member Since: 09 Feb 2011 Location: worcestershire Posts: 1299
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hi steve,
i assume the ohms figure will be printed on the bottom of the sub? cheers |
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6th Nov 2013 5:24pm |
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| mk1collector Member Since: 17 Sep 2009 Location: West Yorkshire Posts: 6769  
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Your amp will run at 4ohms unless your running it in parallel so go for a 4 ohm sub
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6th Nov 2013 5:41pm |
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| farmer giles Member Since: 09 Feb 2011 Location: worcestershire Posts: 1299
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sorry for my ignorance but what would the effect be if i installed the incorrect ohm sub?
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6th Nov 2013 5:50pm |
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| mk1collector Member Since: 17 Sep 2009 Location: West Yorkshire Posts: 6769
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2ohm subs usually come with twin voice coils so you can run your amp in parallel across the two sets of posts making it 2ohm which will be more powerfull but I like to not stress my amps so would run it at 4ohm
Edit: you need to check if your amp is recommended by the manufacturer to run at 2ohms before doing this |
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6th Nov 2013 6:08pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19677 
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As others have said, mine is a 4Ohm DVC wired to be a load if 2Ohm for proper power rating for my system and Amp. To find out the rating it should be both on the Amp or Sub. If not quickly internet search it. Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧
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6th Nov 2013 6:14pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19677
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Just an added note all of the wiring options will or should be in the manuals for a new sub. Iirc a DVC 4Ohm sub can be wired to be a load of either 2Ohm (what I wanted) or 8Ohm
A 2Ohm sub wired to either 1 Ohm or 4Ohm. Basically the Sub and Amp needs to be matched exactly to ever detail. Power rating can give or take very slightly but don't push it. If you can give me your Amp model I can do some searching for you. (PM)  Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 |
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6th Nov 2013 6:19pm |
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| AndyS Member Since: 18 Aug 2012 Location: London Posts: 595 
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This'll do you, JL Audio 8W3V3, I've read good things about them. I've drawn up a plan to include two in the back of my car, just need the money to get them!
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6th Nov 2013 9:24pm |
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| farmer giles Member Since: 09 Feb 2011 Location: worcestershire Posts: 1299
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hi andy,
that was one of the 2 jl subs that i was looking at but i didn't understand the technical difference between the two. on the base of the existing clarion sub it reads 4 ohms, 80 watts nominal; 300 watts peak. so is andy's recommendation the still most suitable? |
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7th Nov 2013 10:41am |
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| mk1collector Member Since: 17 Sep 2009 Location: West Yorkshire Posts: 6769
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Looks good to me
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7th Nov 2013 11:06am |
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