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Discussion in 'Amps and Cabs [BG]' started by bigBbass451, Sep 7, 2004.
is ampeg 3-pro ok at 2.6 ohms?
RMS Power Output (4 Ohms): 450 Watts
im not sure how good it would work with anything lower, but usually you should not go any lower then what they say to, it may affect the amp in ways you wont like.
I don't think its a matter of working well or not... It's a matter of frying your amp or not. Don't run it lower than 4ohms.
From Ampeg Owner's Manual for a 3Pro:
"Always use at or above the rated load."
It's not rated below 4 Ohms. If you mess it up running below it won't be covered by the warranty.
There is a good chance something bad could happen.
Email someone at ampeg, and they'll tell you how bad the amp will blow up.
It is only designed to operate down to 4 ohms. 2.6 is lower than 4, so no, it will not be OK at 2.6 ohms.
At the risk of being thought a jerk, may I suggest a quick read through the manual?
Thing is, this info is available at the Ampeg website... I looked it up, just because someone asked. Why don't people research thier own question & answers?
I wouldn't advise running the 3pro any lower than 4 ohms. I know a guy who did this for a while and finally, his 3pro caught on fire, literally.
What are you trying to do? Run a 4 AND 2 ohm cab together??
ok thanks everyone for the input. i wanted to run a 4 ohm and an 8 ohm cab together. thanks for all the help. sorry if i'm being a "jerk"
if im buying something new. im checking on sites, ratings charts, forums, and all sorts of sh*t before i even come close to going to the store.
At the risk of being called a jerk for defending this guy, sometimes the manual just states the CYA method.
I had a Bassman 400 that you could run all day at 2.6 ohms, but the manual stated that 4 was the min.
Back to your regularly scheduled JRTFMS.
That is possible. What the ratings (from a reputable company) mean is that you can run as stated with normal "margins" for hot weather, lower-than-expected speaker impedance, parts variations, etc, etc, etc, no problem.
Since nobody knows *exactly* where the "margin" ends for a particular individual unit, the spec *should* be short of the absolute limit. What we DO know is that all units will run the way we say.
I would not call it a "CYA" spec. If we could guarantee the unit at 2 ohms (and resulting higher power), we would, be sure of that. We could have designed it for 2 ohms, or a half ohm, for that matter. But it is designed for 4 ohms, and that is what it will work at.
What you do when you run below spec impedance, is to use up the margins. We don't know exactly how much margin you use up, due to uncertainties.
Sometimes you are OK, sometimes you aren't. Blame Heisenberg......
Bottom line is that we (any reputable manufacturer) guarantee it will work within our limits.
Go outside of the limits, and we won't guarantee it will work as expected.
Cheaper gear tends to run closer to the limit, or maybe beyond it, when used at "spec" conditions.
What "works" and what it will handle long term is another story. Think of it like a car and towing capacity. If your car is rated to tow 2000 but your boat weighs 3000, you can tow the thing for a while before your transmission or suspension or your engine fries. Just because it's over the rated limit doesn't mean it'll blow as soon as power is applied, just that it's not designed to go to those places and it's not a good idea to take it to those places.