Did I blow out my amp, speakers, or both
Posted 15 May 2006 - 03:37 PM
Posted 15 May 2006 - 08:27 PM
Posted 16 May 2006 - 01:40 PM
Then did I do my math wrong. If I have (2) 150 watt RMS (300 Peak) 8 ohm speakers running parrallel on one channel, then shouldn't 600 watts @ 4 ohms be about right to give proper headroom? Perhaps it is the workmanship of the speakers or the crossovers, but for both of them to blow, seems weird to me.
Posted 16 May 2006 - 05:38 PM
Then did I do my math wrong. If I have (2) 150 watt RMS (300 Peak) 8 ohm speakers running parallel on one channel, then shouldn't 600 watts @ 4 ohms be about right to give proper headroom? Perhaps it is the workmanship of the speakers or the crossovers, but for both of them to blow, seems weird to me.
Sorry for this I did met one or the other here for speaker or crossover or maybe both, yes two 8 ohms in parallel will give you about 4 ohms and a 602 @ 4 ohms will give about 600 RMS, you said make sure the mixer was not going in red but did your amp was setup to not clip before your mixer? like i said i do not want to bash or *beep* against your speakers but they are not what i would call 'reel Professional speaker like JBL or EV'' so may not be exactly made to take abuse like pro stuff, so may not what you need for the job you are trying to do. Look at these speakers that are rated for 250 watts would be a nicer match for you http://www.jblpro.com/JRX/JRX115.htm and take a look here http://www.crownaudio.com/apps_htm/apps-ppa.htm this will give you a quick idea what crown suggest. Good luck.
Posted 16 May 2006 - 07:33 PM
What is running off of the other channel?
Yes two MTX TP112's paralleled together equals 4 ohms.
With the rule of thumb that you use 1.5 to 2x of Power Amp RMS per the RMS/Continuous rating of the Speaker/Cab then you need between 450 watts (1.5x)
to 600 watts (2x)
Read this: How Much Power do I need.
What Stephane was referring to is if you set your "Gain Structure" correctly.
Your mixer may not be clipping but your amps could still be redlined and Clipping madly!
Here are a couple articles on Gain Structure.
1) Gain Structure 1
2) Gain Structure 2
These Articles and many others can be found at ProSoundWeb's Study Hall.
Link here: Study Hall
As far as your speakers and Amp go, you will just have to check them out.
First hook up your amp and feed a signal to it with no Speakers attached, turn it on and see if the Green signal lights react to the Input Signal and that all looks ok.
Next if you have another speaker (that you know works) hook it up to the Amp and see if it works properly on both channels.
This way, at least you will know that your Amp is OK.
Next check your Speaker cab's, hook them up to your home Stereo or the XLS 602 if the Amp checked out ok.
Gently move the Speaker cone in and out, do they move?
If your Amp checks out ok but your speaker cabs still only have the highs, there is a good possibility that the Speakers are toast.
If they are under Warranty take them in for repair, if the Amp did not pass it's test take it in for Servicing.
If the Speakers are not under any warranty, then pull one of them out of the cab and check it out. Check the leads in the Speaker, it may have had an over excursion and broken the leads to the cone.
Dig in and let us know what you find.
PS. If it turns out that you did fry your speakers, then read all about Gain Structure and make sure that yours is correct.
Posted 16 May 2006 - 08:45 PM
Posted 16 May 2006 - 09:08 PM
No problem, I knew exactly what you were talking about and I think that you hit the nail on the head, so to speak.
I just thought I would add a bit more too your point for Dembits and anyone else that can use the information.
Another thing that will help with System Setup is a Audio Test CD by Micheal Binks.
The link is here: Binks Audio Test CD
It is a large file but if you have the ability to Burn CD's or have a friend that can,
burn a CD (I split it up on two CD's) and you can use it to check Crossover points, Gain Structure, etc.. It is invaluable!
Posted 18 May 2006 - 10:34 AM