8ohms to 4ohms?
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URL: https://forum.speakerplans.com/forum_posts.asp?TID=90573
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Topic: 8ohms to 4ohms?
Posted By: ryanlj1995
Subject: 8ohms to 4ohms?
Date Posted: 02 February 2015 at 6:31am
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Okay i have a DJ speaker i have bought recently and was wanting to change the woofer. The speaker itself is listed as 8ohms. im wanting to replaced the 8ohms woofer with a 4ohms sub, is this possible by just connecting up the wires into the sub? Amp: http://www.electromarket.co.uk/dda0114 DJ speaker: http://www.electromarket.ie/ssa3606 Sub i want to use: http://caraudiosecurity.com/gt5-12-12-1100w-subwoofer
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Replies:
Posted By: BradRWills
Date Posted: 02 February 2015 at 9:51am
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You could. But you'd ruin some already pretty low end kit even further. I suspect what you're looking at is the power handling figures and deciding that a change to some cheap car subs would push the amount of bass you'd get out of them. Not so. The JBL's are rated at 93dBSPL 1w/1m sensitivity. Your cabs (although I don't have the specifics of the 12" in them) are rated at 99dBSPL 1w/1m. This means that to get the same amount of sound out of your replacement drivers, you'd have to feed them 4 times the amount of power for exactly the same result. Apart from the fact that by that time, you will have overpowered your HF drivers. I don't even need to look at the amp specs to know it won't be able to do that. Advice: If your drivers are blown, look for some generic Eminence replacements with a similar set of parameters to the existing ones. If they're not blown, don't try and polish a turd, with a massive heap of bull poop - car audio works on a completely different set of design parameters for a very different environment. They're generally not particularly compatible with each other. Hope this helps - I'm sure others will be able to expand upon it as well, but I think that's the basics :) ------------- Please check out my covers band! http://www.blackmarketband.co.uk" rel="nofollow - HERE! And my live sound blog too! http://www.facebook.com/livesoundblog" rel="nofollow - HERE! |
Posted By: csg
Date Posted: 02 February 2015 at 10:21am
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lets look at the numbers: Your existing speakers - 99db @1w/1M SPL, 200w RMS = 122db continuous SPL on paper Your JBL sub - 93db @1w/1M SPL, 275W RMS = 117db continuous SPL on paper. Which one is louder? ( forgetting the whole box tuning, impedance, crossover, tweeter balance issues that will cause various problems) ------------- “The fact is this is about identifying what we do best and finding more ways of doing less of it better” |
Posted By: Earplug
Date Posted: 02 February 2015 at 10:37am
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Put the woofers in their own boxes underneath with their own amp and a crossover and that might improve your system (slightly). Otherwise, as above no. ------------- Earplugs Are For Wimps! |
Posted By: bitSmasher
Date Posted: 02 February 2015 at 8:41pm
| WOFTAM |
Posted By: mini-mad
Date Posted: 02 February 2015 at 10:33pm
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Dont use car audio. Period. Unless its a big pair of 15"s in a bandpass and its your bedroom your having the party in. ------------- If it sounds like a gorilla is trying to escape, turn it down. |
Posted By: b grade
Date Posted: 03 February 2015 at 12:23am
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Also the sub only claims to be useful up to 450hz, and I am betting it is pretty ugly at 450 too. No way the HF driver is even coming within an octave of that. Big ugly hole in the spectrum. Also, when you have a passive xover and change the driver to one with a different nominal impedance, there is no chance that the filters will still be tuned to match eachother. You can make a nice sounding box with quality car audio kit, but it won't be pro audio pa gear. If you want PA gear, try and buy the best quality you can afford. Bargain basement price for the components does not usually yield the happy kinds of surprises.
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Posted By: burningbush
Date Posted: 03 February 2015 at 10:36am
 You kids, I had to look that up. ------------- music is the message |
bitSmasher wrote:Posted By: Keen
Date Posted: 03 February 2015 at 10:41am
which is almost a WOFTAM in itself
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Posted By: mooreb
Date Posted: 03 February 2015 at 11:10am
So did I!! ------------- FB LS AUDIO SYSTEMS |
Posted By: DMorison
Date Posted: 03 February 2015 at 12:25pm
Likewise, more familiar with WOMBAT myself
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Posted By: AJordan
Date Posted: 03 February 2015 at 2:30pm
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Just had to look both of them up!! DMorison - I darent ask how you are familiar with that one! |
Posted By: DMorison
Date Posted: 05 February 2015 at 12:53pm
Sorry, could've sworn I replied to this yesterday. Anyhoo, no funny or interesting stories behind that one I'm afraid, I'd just been geeky enough to want to find out what a bunch of acronyms meant when I first learned to internet (this was back before mobile phones mind you, so I wasn't even familiar with text-speak ) and that one stuck in my memory.Cheers, David. |