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Mr. OneManBand



Joined: 10/05/11
Posts: 1
QSC PLX3602 problem
      #913416 - 10/05/11 07:45 AM
I have the mixer allen heath ZED12FX connecting to dbx pa and then from the low port,I have the QSC PLX3602 set up as bridge mono to drive 2 subs jbl mrx518. It works well. But now when I change the amp as stereo and connect it directly from mixer to the main JBL MRX515 speakers, I only hear the bass, no more treble sound. Also, I have tried to connect amp to the high port of dbx , I still have the problem with output the bass sound only on MRX515. What wrong with the amp ? Any reset to make it work to produce both treble and bass to the main speakers like before ?
Please advise !
Thanks


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TSH-Tim



Joined: 21/02/11
Posts: 828
Loc: Guildford
Re: QSC PLX3602 problem new [Re: Mr. OneManBand]
      #913453 - 10/05/11 10:00 AM
Don't these amps have a HPF switch on the back of them ?

--------------------
PA Hire Surrey
Lighting Hire Surrey


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Sheriton



Joined: 27/01/03
Posts: 1555
Loc: Leicester, UK
Re: QSC PLX3602 problem new [Re: Mr. OneManBand]
      #913518 - 10/05/11 02:37 PM
Could be any number of different things. I assume you've tried the speaker with a different amp to check that the speaker is working correctly? And likewise tested that amp with a different speaker to confirm that the problem definitely lies with the amp? And double-checked you're not doing anything silly with the crossover or desk outputs? (We've all been there...)
If memory serves, the amp only has 30Hz and 50Hz HPF switches on the back so they wouldn't account for the problem you describe.
It would be quite unusual for an amp to fail with those symptoms - I'd certainly be looking elsewhere for the cause first.

--------------------
There's nothing we can't face... Except for bunnies


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seablade



Joined: 21/11/04
Posts: 4014
Re: QSC PLX3602 problem new [Re: Sheriton]
      #913525 - 10/05/11 02:55 PM
Quote Sheriton:


If memory serves, the amp only has 30Hz and 50Hz HPF switches on the back so they wouldn't account for the problem you describe.




Nope, it should have both a HPF and LPF... see here...

http://www.qscaudio.com/images/hi_res/PLX2/PLX3602_rear_hi.jpg

And it sounds like the LPF is engaged and needs to be changed obviously if the OP is looking to use it with full range speakers.

Seablade


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Sheriton



Joined: 27/01/03
Posts: 1555
Loc: Leicester, UK
Re: QSC PLX3602 problem new [Re: Mr. OneManBand]
      #913580 - 10/05/11 09:49 PM
I was thinking of the original PLX, not PLX2...

--------------------
There's nothing we can't face... Except for bunnies


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TSH-Tim



Joined: 21/02/11
Posts: 828
Loc: Guildford
Re: QSC PLX3602 problem new [Re: TSH-Tim]
      #913779 - 11/05/11 06:43 PM
Quote TSH-Tim:

Don't these amps have a HPF switch on the back of them ?




Sorry i meant LPF ....

Also check where & what channels these settings are set to as am sure you can pick.

--------------------
PA Hire Surrey
Lighting Hire Surrey


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