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Speakers and OHM's

I have two realistic mach one speakers and the woofers are compleatly messed up and need to be replaced. On the magnet of the woofers it says 6 Ohm's, i want to know if i can replace them with a 4 Ohm woofer. By using a 4 Ohm woofer would it fry the internal crossovers, or do any damage to the tweeter or mid. or anything elce?

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  • sub guy Jul 25, 2008

    Are you sure, these speakers were very expensive.

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Hi my name is kelly, i also have a set of mach ones but mine are not liquid cooled thay are the first model before the liquid cooled which is model number 40-4024a not 40-4029. in that case i have asolution to your problem i know of a place that can totaly repair the hole woofer,the surrounds,the dust cap the hole thing back to its origianal look and sound. go to www. speakerex.com and talk to a rep, this company has been reparing speakers for many years, thay are located in orlando florida i have already talked to a rep already and thay have givrn me prices already if the speakers need to be refoamed it would cost 50 to 75 dollars to fix, or if they are realy messed up bad they can be totaly reparid back to brand new for 90 dollares each plus shipping thanks kelly

Posted on Aug 28, 2009

It will work temp. but it may put to much of a load on the receiver

Posted on Jul 27, 2008

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It should be fine, just dont go under 4

Posted on Jul 25, 2008

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1 Answer

The woofer doesnot work and the horn is working but not as usual


First you need to verify that there is nothing wrong with your amplifier. Simply swap speakers around and see if the fault follows the faulty speaker or stays on that channel. If the speaker is at fault I would hazard a guess and say, that the woofer has burnt out and is now a high resistance. This would then increase the total impedance of the speaker circuit and make the horn speaker sound the way you described. This can be verified with an ohm meter. Total impedance should be about 4 to 8 ohms. The only real remedy is to replace the faulty speaker woofer. Sorry

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4 ohm and 8 ohm speakers


You can plug in higher ohm speakers , the higher the ohm the higher the resistance is, it is a danger when you plug lower ohm speakers into a higer ohm Amp , at a high volume that will cause them to blow , the center speaker would be fine to use a higer ohm speaker , your best choice is to buy a Active Subwoofer, which means the sub has it's own power supply , and u can blast the thing as much as u like , thn u can turn the bass down on all the other speaker's so u can play it louder , and have the sub turned up has high as u like , this is the best way to get great sound with high volume , buy a Active sub woofer , any active subwoofer is ok , a active sub woofer has its own volume and inputs on the speaker ,

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The mid/bass is blown on my Sapphire SB bookshelfs and I cannot find replacement drivers. They are 5 inch 4 ohm but no manufacturer data. Any suggestions


http://www.parts-express.com/resources/woofer-selection-guide.cfm

Sort the guide by woofer size. Measure and match the hole opening, approximate volume of the speaker box and the -3db cutoff specified by Sapphire to something in the guide. Look for 4-ohm models, of course. Also, if you know the sensitivity rating (87db or similar), shoot for the same rating.

In order of importance -

DB match - get it wrong and the speaker will sound dark or bright.
Impedance match - get it wrong and the crossover frequency will not be correct.
Volume / F3 match - Will affect bass response.

As Sapphire is long gone, aftermarket replacements are your best bet. You might be suprised at how good a shot in the dark will sound. PE has a good return policy if you take care not to mess up the drivers during tryouts.

Jan 14, 2011 | Sapphire Technology SB Main / Stereo...

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I have an AR s112ps subwoofer. I woofer is blown and i would like to find a replacement woofer. I havent had any luck looking on the net so far. any ideas?


all you need is an 8 ohm subwoofer or a Dual Voice Coil (DVC) 4 ohm subwoofer wired in series that can handle 120 Watts rms. I Went with a Rockford Fosgate Punch P1 P1S812 12-Inch 150-Watt Subwoofer - 8 Ohm

it was only $35 from amazon and is probably nicer quality than the original driver. Good Luck

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Just got two AR 312 HO speakers from my brother. I have a Yamaha HTR 6250. The speakers have (2) sets of cable hook up. One I assume is for built in sub woofers? Do I hook one normal and one to the sub...


do not use those speakers with that amp, those are 4 ohm speakers, which could damage your 8 ohm yamaha amp. you will have to get a 4 ohm capable amp to run the highs, and another 4 ohm amp to run the subs.

car amplifiers are currently 4 ohm, or even 2/1 ohm stable, but few, if any modern receivers can run at anything lower than 8 ohms without a danger of overheating. you may have to get a vintage amp(s), like a 1970's marantz receiver, or a 1980's to early 1990's kenwood power amp, because 4 ohm home amps are pretty scarce nowadays.

whatever amp(s)( you get, verify that they are DEFINITELY 4 ohm stable.

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I have dropped one of my mackie srm450 speakers and i need a replacement woofer.. where can i get one?


If the cone is damaged, it is possible to get it 're-coned'. If you can find a shop that does this type of speaker repair.

Otherwise, call around music stores (by that I mean places that sell musical instruments and PA gear) and see if they sell/sevice Mackie. If you are comfortable taking the old woofer out, just order the part and DIY.

It is not critical that the woofer is an exact replacement (doesn't have to be a Mackie speaker), the important things are:

1) it fits and screws back into the speaker cabinet
2) it is electrically similar to the original (same impedance 4 ohm or 8 ohm) and wattage rating

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1 Answer

BLOWN WOOFER


there are always good replacement options. just send the woofer size and your budget and choices can be made. you can also have the original reconed.
cathy@spekaerex.com

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I wouldn't try reinventing it by replacing the driver. Drivers and their enclosures are designed to work together. And this being a self-amplified subwoofer, there is one more piece that's electrically optimized to the rest. Don't mess with it.

Why don't you just set your receiver's individual relative speaker volume levels so the sub isn't weak by comparison to your other speakers? Weakness, as you call it, is relative.

Is your receiver properly channeling Low Frequencies to the sub? Experiment with the cutoff, too.

This problem doesn't require meatball surgery.

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Speaker, costs, availability.


You can get replacements directly from Ohm. They have a website. They cost $95 each and are noticeably better than the old woofers. Ed

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