Running 8ohm speakers on a 4ohm amp
Posted 12 April 2010 - 04:59 PM
After seeing mosoto's for sale advert this morning, I realised my PG Xenon 200.4 is not 8ohm stable in normal stereo mode. I misread the bridged 8ohm rating, and thought it was for stereo too.
Now, I have some USD Waveguides (8ohm) running off 2 channels on the amp, they have been running for a few months now, and to me, sound fine, with plenty of volume.
My question is, will the amp get damaged over time, running at 8ohm's, when it is only rated at 4?
The amp has not been getting hot, and as mentioned, sounds fine. I realise I will not be getting the 200W rated for the channel, probably less than half of that. The guides are only rated at 65w though, with good efficiency, so that is not a huge deal.
Any help is appreciated, as I do not want to kill my amp, but on the same side, do not want to spend more money on another amp if it is ok to run it like that.
Posted 12 April 2010 - 05:04 PM
Posted 12 April 2010 - 05:33 PM
And dont forget, horns need bugger-all power to make them sing. You would'nt want anything above 50WRMS going into your Waveguides anyway otherwise you'd rip your head off with them! I had a pair of Waveguides myself. They were only going to see 50WRMS on 4ohm
Posted 12 April 2010 - 05:54 PM
it'll be fine there is no problem running amps at a higher impendence, it is when you try to run them lower that you can have a problem
Posted 12 April 2010 - 06:39 PM
Posted 12 April 2010 - 06:43 PM
Posted 12 April 2010 - 07:24 PM
Posted 12 April 2010 - 07:57 PM
Posted 12 April 2010 - 09:39 PM
Well, if they were midrange speakers and the minimum nominal impedance was 4ohms at 100Hz but rose to 6ohms at 400hz you 'might' get away with a crossover at 400-500hz. But why would you?
So are you saying that me running 2 set of 4ohm speakers down to 2ohm stereo wouldn't be a good thing? Because I'm looking at running my midbass drivers at 2ohm stereo
Posted 12 April 2010 - 09:58 PM
Posted 12 April 2010 - 11:18 PM
Edited by mosoto, 12 April 2010 - 11:19 PM.
Posted 12 April 2010 - 11:36 PM
Posted 13 April 2010 - 08:54 AM
Posted 13 April 2010 - 10:36 AM
I wouldn't use a speaker setup below minimum nominal impedance on an amplifier unless I was being silly, or wanting to do SPL stuff.
The fact that most speakers rise above minimum nominal impedance most of the time doesn't mean you can really get away with lower than rated impedances - the amplifiers are rated with this in mind.
I'm sure we all know that amplifiers work plenty hard even above minimum impedance, running below it is just tempting fate.
Edited by Big_Valven, 13 April 2010 - 10:36 AM.