Hi , thinking of finally taking the plunge for M80's but being as they are 4 ohm's , has anyone one mated them up with a Yamaha 1800 or 1900 model .
I am currently running Image Dynamics car speakers mounted in a cabinet with 2 6.5 woofers and a tweeter which are 4 ohm with no issues. ( guess i am answering my own question):-)
On a side note , i listened to the kef C7's on the weekend and was not impressed for the 800 dollar price range , my current set up blew them away .
I see that the 1800 is rated for 130W per channel, I have a RXV2700 rated at 140W per channel, the 2700 has an impeadance slector two switch to 4ohm if you need it..not necessary to run M80 with this amp. I shot off an e-mail asking Axiom if the 2700 could run them find and they said there should not be a problem.
I donot see an inpeadnace selector onthe 1800 but I would think that you should be able to run the M80's with that AVR. Just shoot the tech e-mail a note and they will get back to you.
Later
Phil
I would not recommend changing the impedance switch to a lower setting, your just limiting the current by doing this...
Limiting the current actually makes damage to the speakers more likely, to amplify (ha) on Randy's note.
I think I've heard of people using a 1900 with M80s, but don't quote me on that. I use a Harman/Kardon AVR525, which is rated at something like 85WPC into 4 ohms, so you can't just look at the watts RMS value and figure out if it'll be stable with M80s (or any 4 ohm speakers).
PT, yes you're answering your own question to a considerable extent by noting that you have no problems now with 4 ohm rated speakers. You should also note that the M80s have slightly higher sensitivity than average and so require less power than many other speakers, and that over a majority of their frequency range they could be rated at 8 ohms.
As to a setting on the receiver for lower impedance, as was said, this should never be used. All it does is limit the voltage(not current)which the power supply section can output with a resulting reduction in current and power capability(Ohm's Law). This helps satisfy UL requirements to help prevent overheating, but tests have shown that it cuts maximum power capability roughly in half.
so lowering the voltage, results in a reduction of current, so I was right.
Ok, now explain how limiting voltage is harder on speakers?
It's much easier to drive receiver into clipping the with the switch in the 4 ohm setting due to the voltage being significantly reduced.
I see, and clipping is detrimental to a speaker then you're saying.
Ok, so from this lesson we can take away that listening to speakers being played through a 100 watt reciever too loud 'can' be detrimental to your speakers... yes?
If played beyond it's limits...yes.
Lol, I'm just being mischevious.... that's all
Thank you all for you input .