Question about JBL PRX512M Speaker

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My speaker sounds muffled. Its alot of low end put not that much high. All my eqs are adjusted fine, and when i plug the same wire into my Mackie, NO PROBLEMS. It's definetly the speaker

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Well it sounds like you know what the problem is already, the first thing you need to determine is if the fuze is blown, jbl's are expensive speakers and usually there is an internal and sometime an external fuze, sometimes the midrange and tweeters are fuzed sepeataly. I'm ont familiar with that particular model, but if it not a fuze then most likely you have overloaded the high end speakers and they may have blown out, the high freqency drivers and not cheap and if they are new and under warranty you might have a chance to get new tweeters/horns free but if it is your fault e.g. too much power going in, then you will have to pay for them. You can get replacemdent JBL or other good speakers at www.martinsoundproducts.com they are out of Cleveland Ohio and you can call them when you get their number off the website..

Posted on Mar 20, 2011

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Posted on Jan 02, 2017

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Sound gets muffled at certain frequencies. Please Help!


I think that rather than the mixer, that your front speakers may have a limiter built into the high frequncey amp. You may be asking them to do more that they are capable of.

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I turn it on and at the volume set @ U or straight up(midway) nothing comes out. if you turn it all the way up of course you get alot of buzz and barely get any sound from a mic or mixer signal,etc. could...


Make sure you are using BALANCED line to this... XLR connections boyh ends. Make sure ALL interconnected devices are powered from the same receptacle or power conditioner. Test your cables... they do go bad. This unit REQUIRES line level input. Do NOT expect a mic to drive it directely. Make sure your mixer uses the XLR outputs and is powered from the same receptacle, even if you have to run an extension cord to it. This is a bi-amped speaker so there are independent amps for high and lows. With nothing out and known good in there is very little electronics before the signal is split to the separate amps. At line level, your volume control should probably be about 2 o'clock with the EQ's straight up flat.

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MAckie 1604 VLZ Pro Mixer, running QSC 1850 with jbl's from main outs. I would like to hook up powered subwoofers. What is the correct pathway? kenshireman@msn.com


The best way is to use a two-way crossover between the mixer and the amplifiers. In your case, the low output from teh crossover would go to the powered subs, the highs to the QSC. Use the crossover adjustment to set the frequency crossover point to get the sound quality you require.

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Mackie 1604 ---> Crossover --- Highs ---> QSC --->Speakers
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I ended up installing a stereo graphic equalizer/ sound limiter from Radio Shack. I use the ear phone output go into the equalizer / sound limiter then go into a speaker system. You can adjust the EQ and limit the volume. I also had problems with load portions of movies, commercials and low/ high audio. This also allows sound enhancement with some buttons on the EQ. It is usually used in sound reinforcement as in Band and public address systems also higher end stereos systems. you will need a set of powered speakers for this solution so the EQ has somewhere to go to.

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The connections can be accomplished in 2 ways: Direct or using insert cables. The most common way is directly as follows:

Mixer L/R ===> EQ Input L/R ==> Amp Input L/R ==> Speakers L/R

Using insert cables you would have a single 1/4" connector at the mixer end (inserted in to the "insert" L or R) and the other end into the EQ. If you need more details about this method, please post the model of the EQ so I can determine the type of insert cable required.

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1 Answer

My high end stopped working in both my speakers


First thing is to run a known signal from a simple device like a small CD player to verify the problem.

If these are driven from a mixer, the EQ could be set to kill the highs.

Assuming it isn, something simple like an EQ setting, probably the units will have to be serviced. I know you would already have checked the EQ on the back of these things as a first step.

Remember to ALWAYS power these from the same source as the devices connected to them to avoid ground loops and damage.

Supersonic feedback can fry these. Oscillations higher pitch than you can hear can put too much power into the tweeters of these.

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No human sounds when playing dvds.


sound like the center channel is out
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1 Answer

'stereo' speaker problems


Yer man there a load of **** i've got 2 x DV290's one for the back of my studio & one powering the front,your lucky you only had 2 **** speakers i had 4 lol.
but there is light at the end of the woofer,they have to be wired together its as if one makes the other one work,so you put GRAY & BLUE in you get BASS or hum ,you put BLACK & RED in you get HIGH or top end you put all four in you get nice mixture.
I've also had it another by mistake & it worked, i put the + & - side by side instead of top & bottom so it was RED / GRAY & BLACK / BLUE if you know what i mean.then cut the plugs off the surrounds & wired them in aswell & it's all good in de hood.
oh a tip before i go,get some rubber legs off the bottom of something or the casters off an old chair or stool & GET THEM SLAPPED BETWEEN THE AMP & THE SOUND PROCESSOR for ventilation coz Fu*"*k me they don't half get hot man!
good luck pal....later








Aug 12, 2007 | Technics SC-DV290 System

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