Impedance switching is there for safety reasons, to prevent heat build up. A 300 watt amp that has 300 watts at 4 ohms will make ~ 175 whatts at 8 ohms. Lower rated impedance less ohms could damage the stereo because too much current is flowing through the circuit. If I cherry picked my music, for sure! Prudence dictates that one should not run a lower impedance load than recommended. The important thing is that the total impedance of the speakers doesn't go below the minimum rating of the receiver. I am assuming that is the circuitry protection being activated due to the 4 ohm speakers. Again depending on what receiver you've got it may have pre outs.
In 2008, Clint was invited to be part owner in what was then The Audioholics Store later to become Audiogurus. You should be able to hear it before you do any damage though. You appear to be cherry picking certain aspects of the report? I think you said it was 75 watts in to 4 ohm speakers. No sonic difference on paper, or in real life. Higher is fine although not optimal. The total will be 2.
My head will do 4, 8, or 16 ohms. Larger reinforcement speakers, subs, etc. You need to find out how many ohm's your deck is pushing out and make sure you have the right grade speaker wire so you don't under power the speaker Rubbish. But am I right in thinking about the max peak power this way? Reality is that few of us ever come close to using full output power from our amps and amplifier impedance ratings are made at full output power. It'll still be loud, though! I inherited a home audio setup from my audiophile brother.
Better receivers that have external speakers will provide a printed specification for the speakers. There's difinately no safety warning in relation to its use posted within any of the manufacturer's manuals. Your primary question is: Can the same model of speaker in different impedances sound different? The only other solution is to invest in a better receiver and speakers that meet your needs or expectations. The documentation doesn't address this directly. Very few are 4 ohms.
What stimulated it is demonstrated by post 26. Also, some other people are mentioning some other issues such as heating up, or causing the speakers to Blow. Let's forget for the moment about sonic issues as I'm limited with budget and sources for a matching single unit center spkr. I think the only difference you would see anyway is slight increase or decrease in total output, and that would so minor, the human ear probably could not hear it. It goes into great detail in relation to this matter. The important thing is that the total impedance of the speakers doesn't go below the minimum rating of the receiver.
Only issue is the woofers on the speakers distort quite a bit on certain songs any genre at higher volumes. My posts are based on experience and I'm willing to put what I've posted to the test. In the car stereo market, virtually all speakers are 4 ohms. The good news is you have a decent amp that should have protection from a low load though I still wouldn't want to trip the protection circuit , but I have seen plastic parts on an amp melt off literally put a big hole in it from driving too low of a load. As Bill mentioned, they draw more current to get to the same volume level as an 8 ohm speaker.
Until you offer a more specfic question - You will not get an answer tailored to you. Protection circuitry is not full proof and is less so with less expensive products. What just occurred to me though. Is there danger in this whilst using A+B speaker setting? If you do bridge your 4 ohm speakers, check your amps documentation to make sure it's safe to bridge it with 4 ohm speakers. As a disclaimer, sensitivity ratings for speakers are generally taken with 1 watt being fed to them. I like to play my music and audio loud.
The speakers are perfectly fine and sound great. The receivers have additional protection circuitry that actually provides more protection than any lowering of the rail voltage can possibley attain. If you saw the test with all channels driven, there would be hardly be any difference between the High and Low impedance outputs as the Power supply would be unable to supply enough current. Thats why using a 4 ohm cabinet instead of an 8 ohm cabinet with your head doesnt always blow you away. The Orange, having a total impedance of 16 ohms, would use two 8-ohm speakers wired in series. Thanks for all your guys help.
If it is a match, you are not overheating your amp and everyone is happy. It makes perfect sense if you understand the math. If the designers have really tried hard to duplicate the sound of their 8-ohm version of the same model the differences couold be slight enough that one would have trouble hearing those differences once mounted in a cab. The 4 ohm cab will be louder, but not twice as loud as the 8ohm. Go write a white paper on the matter, but please refrain from giving advise that is incorrect or not based on any practical experience. Knowing that, along with the knowledge that the 16-ohm speakers could potentially be a bit brighter, one might assume that the Mesa cabinet has the potential to be the brighter of the two. And no amount of remedial playing will change any of this.