Weird problem.I get a very low volume,, all treble sound when I play a CD. I turn up the volume at the amp and one of the speakers come fullrange while the other side shows flashes or sparks in the cone region of the main top speaker/driver.These speakers are powered by a NAD 350 and have very little use since bought a few years ago.Any advice would be appreciated, but I am not a techie. Thanks Phil
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8 Ohm refers to the nominal impedance of the whole speaker. How would you 'use' 4 or 6 Ohm? Any modern amp should be able to handle 8 Ohm. The M70 have relatively low sensitivity, and require more output-power for high sound-volume.
What audio source you put into your Amp? you can lower the source volume also the amp volume to confirm, where the problem come.
Source input is also important whether you using low level or hi level input.
It's probably blown tweeters. But if you want to spend the money on a hipshot guess, try to find the the crossovers somewhere first; then find the readily available tweeters if/when that doesn't work out. Google "alesis monitor one MK2 tweeter".
You could test the tweeters by just removing one non-functional tweeter and wiring it directly to the speaker leads and with REALLY LOW volume containing NO BASS see if it makes any sound, which would prove it does/does not work.
Going forward, if the speakers sound stressed at high volume - THEY ARE. Too much power or too much distortion (overdriven amplifier) will kill speakers.
Try reversing the POLARITY of the wires on the speaker that is playing at a low volume (swap wires connected to the + and- terminals of the speakers). This would put the speaker back in phase if it were reverse connected, and provide the expected volume level again.
Do not remove the brass plates! These work as a bridge between the connections, making them a universal speaker. You only need one input. The other input should say "Bridge", which is an output to the other speaker, allowing you to run these speakers as monitors or subs. The bridge option runs both speakers on the same channel, making it a mono signal, so if they are used as monitors, everyone hears the same thing. If they are used as subs, equal power goes to each, reducing the chance of a blown speaker.
What you need to do is connect a 1.5 volt battery to the speaker(s) terminals for a split second. Put your ear to the tweeter at the same time (you might someone to help you do this). If the tweeter "pops" it works, if not you might have blown them. The best way would (to be certain) is to remove the tweeter from the crossover inside the unit.
Tweeters are the first thing to go when the speaker has been connected to an amp that is wrong for them or they have been run at high volume.
I'm guessing you mean one of the bass drivers (as standmount or floorstanding speakers don't have subs as such). Place your hand lightly against the driver when playing some music at normal volume, there should be some vibration (this increases the louder you play). If there's no vibration, you're probably right.
Contact Mission, who can send you a new driver, contact a Mission dealer to see how much it'll cost to go through the dealer network. I'd recommend going down the latter route if you are unsure of what to do yourself.
Just noticed you posted this in March, in which case, I hope you got it fixed (or are enjoying your new pair instead!).