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Author Topic: Amp settings  (Read 1499 times)

PabloHoney

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Amp settings
« on: February 28, 2006, 04:44:15 AM »

Hi, I have a question regarding amp settings. I am using one channel of a behringer 2500 to run two foldback monitors (200W RMS each).
How do I know how much gain to set the amps channel at?
Cheers
Very Happy
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DAVID_L_PERRY

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Re: Amp settings
« Reply #1 on: February 28, 2006, 05:13:27 AM »

Assuming both your monitors are 8ohm, then one side of the EP2500 is pushing out 650w-750w at 4ohms.
Thats only 375w per cab.

Most people suggest having about twice the speaker rated power available at the amp end for headroom.

Dont worry about it and crank it all the way up. Better to have headroom than clip the amp...

Dave
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PabloHoney

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Re: Amp settings
« Reply #2 on: February 28, 2006, 05:36:39 AM »

Yeh I'm running the channel gain at around 26dB which is a bit over half way and the clip light has never come on. Seeing I'm running the foldbacks in parallel and they are rated at 200W, 8 ohms each (400W at 4 ohms), then what you are telling me is it should be safe to turn the amp (rated at 650W at 4 ohms) all the way up?
Cheers
Very Happy
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DAVID_L_PERRY

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Re: Amp settings
« Reply #3 on: February 28, 2006, 05:46:44 AM »

Exactly...bang it all the way up... Smile
Headroom city
Best to keep the EP2500 limiters on
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Ivan Beaver

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Re: Amp settings
« Reply #4 on: February 28, 2006, 06:53:15 AM »

For the Billionth time THE "VOLUME" KNOBS ON THE AMP HAVE ABSOLUTLY NOTHING TO DO WITH THE OUTPUT POWER THAT IS "SENT" TO THE LOUDSPEAKER.  They only adjust the overall gain of the amplifier.  Most amps can put out full power-even when the volume is set on 1.
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For every complicated question-there is a simple- easy to understand WRONG answer.

Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.
Danley Sound Labs

PabloHoney

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Re: Amp settings
« Reply #5 on: March 01, 2006, 04:32:08 PM »

Sorry for asking a question!
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MikeLascuola

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Re: Amp settings
« Reply #6 on: March 01, 2006, 04:36:08 PM »

I may be speaking out of turn, but I don't think the shouting was directed at you.  

But there is a very useful feature here for searching for previous posts.  I have learned a great deal by reading answers that are already here!
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Tom Reid

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Re: Amp settings
« Reply #7 on: March 01, 2006, 09:06:51 PM »

PabloHoney wrote on Tue, 28 February 2006 04:36

Yeh I'm running the channel gain at around 26dB which is a bit over half way and the clip light has never come on. Seeing I'm running the foldbacks in parallel and they are rated at 200W, 8 ohms each (400W at 4 ohms), then what you are telling me is it should be safe to turn the amp (rated at 650W at 4 ohms) all the way up?
Cheers
Very Happy


Like Ivan says, that knob turns down the input to the amp, not the output of the amp.  If the signal was strong enough, the knob could be on 1 and amp would deliver full power.

The Study Hall button is in the upper left.
Check out setting up gain stages.
You want max signal flow all the way through.
This gives you a fighting chance of getting all the sound to the speaker.

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tom

What does Buddha do on his day off?

DAVID_L_PERRY

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Re: Amp settings
« Reply #8 on: March 02, 2006, 03:51:46 AM »

Ok its flak taking time.... Very Happy

Pablo...reading the study hall is a great thing but setting gain structure is likely to absolutely blow your mind. It can read as an increadibly complicated issue....

This is one very simple way of checking basic gain structure.
(yes it can all be fine tuned but gives a basic starting point)

Plug your desk into your amp (dont plug in your speakers)
Crank up the desk so that your meters are just starting to clip with a good cd source.

Turn up the amp until that also starts to just show the amp starting to clip. To be safe you could drop the gain down a notch if you want. This way you know that if your desk is clipping (which you dont want to do) then you know the amp is also on the verge of clipping. Basic gain structure....

OK line up the firing squad...
Shocked
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PabloHoney

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Re: Amp settings
« Reply #9 on: March 02, 2006, 04:39:41 PM »

Cheers mate! Very Happy
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