"below" 20hz.

The amp's fan is just a 24v DC version of a PC fan. To me it sounded more like a house fan. As you can see from the picture, it sits in the front of the room under my screen. I'm sitting about 12 feet from it. With the replacement fan, I can only hear it from 3 feet away with nothing else in the room on. It is worth the $12 to replace the fan. And if the amp craps out under warranty, I can put the old fan back in when I send it for repairs.

As your driver's approach xmax, you will begin to hear distortion. Once you reach xmech, you will hear the voice coil slam into the back plate of the magnet. It's a metal on metal CLACK sound. Turn it down immediately. Fi has some pretty strong voice coils but even they will not stand up to this kind of abuse for very long. Basically, don't go nuts. Learn how your system sounds and keep increasing the volume until you reach your preferred listening level. With the auto calibration of your system, it should be very well balanced. A lot of people try and calibrate by ear and end up running their sub 10db higher than the rest of the system.

Here's a nice link for movies with bass - link. The movie Pulse has a scene that has killed many lesser subs so be very careful with these movies. They bass can sneak up on you quickly.

-Robert

thanks a lot. ill prolly do the mod then i guess because even if i can stand the fan noise, i think the back-front air flow is stupid. it gets debris and whatnot in there. ill try to get some pictures or a vid when im done setting everything up. thanks again Robert.

should i get a new fan altogther or could i just connect a 100 ohm 10 watt resistor to decrease the fan's rpm? and how do you reverse the airflow? can i just turn the fan around? and i think that with the new ep units, they did a hot glue connection so that ppl cant void the warranty and then go back to stock when its broken. ill have to see when i get it though.

Reversing the flow is as easy as turning the fan around. I did that.

I used the resistor method at first because I was cheap. The fan did not always turn on. I'm now on my second EP-2500 because my first overheated.

The hot glue takes about 3 seconds to pull off. Yes, it does tell them if you made a change but I don't think it is a big deal.

-Robert

i think ill try the reverse airflow first. so is there another kind of resistor that i can use that is going to be better than using the 100ohm 10 watt resistor so that it does turn on and not heat up? going lower in ohms?

Yes, it does tell them if you made a change but I don't think it is a big deal.

-Robert

I would call no warranty on a new unit a big deal. Make no mistake, if they can tell you made any changes, your warranty is void, no matter what the reason you send it in for warranty.

I would call no warranty on a new unit a big deal. Make no mistake, if they can tell you made any changes, your warranty is void, no matter what the reason you send it in for warranty.

After my first amp crapped out, I called an authorized Behringer repair center in St. Louis. Talking to him, he just wanted to repair the amp and get paid by Behringer. Outside of warranty, it isn't worth getting these things repaired. It was going to be $250 to repair mine but I could get a new one for $275.

-Robert