I am having a dilemma with my rig, I am running an old Ampeg SVT2 pre-amp and a QSC GX5 500w per ch power amp. I also am running 2 2-18 cabs. It seems to have a problem overheating and shuts down. I have to shut it off for a bit and it will come back, but once it does it once it will do it all night.
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- Thread starter jjbuga
- Start date
I've had only combo amps since I've begun playing, but I've perused these forums long enough to know that four 18" speakers is a helluva lot of surface area to push.
What's the dilemma? Reduce speaker loading or increase power.
I'll pose the question, even though it's beyond my personal experience: impedance matched?
What's the dilemma? Reduce speaker loading or increase power.
I'll pose the question, even though it's beyond my personal experience: impedance matched?
Jim Carr
Dr. Jim
- Jan 21, 2006
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- fEARful Kool-Aid dispensing liberal academic card-carrying union member Musicians Local 72-147
Is it possible you are overloading the input. Check the manual, as there is a warning about that possibility. What impedance are the cabinets and how are they connected?
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DiabolusInMusic
Functionless Art is Merely Tolerated Vandalism
Jim Carr
Dr. Jim
- Jan 21, 2006
- 16,223
- 7,613
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- Disclosures
- fEARful Kool-Aid dispensing liberal academic card-carrying union member Musicians Local 72-147
Jjbuga, before we can help you we need more information. The number and sizes of your drivers has no bearing on your problem. How they are connected together does.
As had been asked earlier:
What is the impedance of each of the cabinets?
What is the power rating of each cabinet?
How are you connecting them to the stereo amplifier?
Is the amp running in bridge?
What kind of cables are you using to connect the cabinets?
As had been asked earlier:
What is the impedance of each of the cabinets?
What is the power rating of each cabinet?
How are you connecting them to the stereo amplifier?
Is the amp running in bridge?
What kind of cables are you using to connect the cabinets?
- May 9, 2008
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- Proprietor Springvale Studios
Is this the sort of amp you can set a high pass filter on.
If so what is it set at because in a small rehearsal place, you may be making a lot of VLF and not feeling or hearing it.
If so what is it set at because in a small rehearsal place, you may be making a lot of VLF and not feeling or hearing it.
Hi,
I read through the manual. Given the information you've provided, it sounds like you have everything properly set up. (You are NOT using bridged mode, right? You have the channel gains turned up past halfway [less than -10db], right?) In that case you may just have a thermally intermittent component in the power amp itself. I know it's inconvenient but it may be time to have a qualified tech have a look. Bummer.
Thank you for your indulgence,
BassCliff
I read through the manual. Given the information you've provided, it sounds like you have everything properly set up. (You are NOT using bridged mode, right? You have the channel gains turned up past halfway [less than -10db], right?) In that case you may just have a thermally intermittent component in the power amp itself. I know it's inconvenient but it may be time to have a qualified tech have a look. Bummer.
Thank you for your indulgence,
BassCliff
+1. It would seem more common for a cabinet with two giant speakers to be 4ohm. And if you were to be rocking two 4ohm cabs, that would explain some of the thermal issues.
