Originally Posted by eckoflyte
Got my Anthem MRX 310 yesterday and the sound is incredible. Have it hooked up to an external power amp.
Thinking of moving the power amp into another room for seperate duties and using the MRX 310's internal amp.
I will be driving it in stereo mode to a set of Monitor Audio Silver 8 that are rated up to 200w @ 4ohm.
I have a few questions for Nick.
1) Is the MRX 310 capable of 4 ohm nominal?
2) Is there some form of clipping protection or warning signal which is displayed if the amp is overdriven?
3) What are the distortion specs rated for at 4ohm on the MRX 310?
Nick @ Anthem doesn't show up upon request, though he might PM you. Not sure how to define his job, but in the past his input appears to be on his own time, but hard to know. The fact that he comes as a representative at all is really cool, given the lack of feedback often seen from other companies. Part damage control of course...the Anthem's have their issues, as do most AV products nowadays, but also very helpful and informative, so a definite thumbs up for Anthem and Nick IMHO.
To answer your questions, to the best of my ability...which admittedly isn't the most profound, as I am far from the most informed person on this forum!
1) While the MRX line is not spec'd for four ohms speakers, the Anthem can drive them. The bigger issues come from phase variation within the speakers themselves. As I understand it, differing phase angles, or extreme differentiations between simultaneous positive and negative phase signals within the speakers themselves can cause a near shorting at the amplifier, causing shut downs. I run Vandersteens, and though I use my MRX 510 as a pre, I have run it for quite a while on its own, with no problems. My speakers are rated b/n 4 & 6 ohms, with my rears dipping to 3 ohms, but they are phase consistent across bandwidth, and hence not so hard to drive, even though they are not a particularly efficient speakers. Where the resistances dips along the audio spectrum is more an issue. A 4 ohm speaker that dips into the nether regions at 100 hz is going to be a more difficult load than one that does so at 12khz, making nominal ratings as provided by most manufacturers a fairly useless spec. So the true question is, will the Anthem drive your
4 ohm speakers? You could email Anthem and ask specifically. They have been accumulating info. over the last year or so now as to what speakers aren't playing nice with the MRX series, and they might have an answer for you. Or you could just try it. If the amp shuts down, it's protecting itself before damage can happen. You really have nothing to lose, and you'll have your answer.
2) No. It just shuts down. The fan on full will give you plenty of potential heads up. I've researched the fan, to see if there were a potentially quieter replacement, and it specs at 37 db at full output. I haven't taken a meter to it, but it's definitely too loud for an audio component, and I really hope Anthem will address this in their next iteration of the receiver.
3) No idea, but it's not something I would be too concerned about personally. My 510 has one of the nicest sounding amp sections of any receiver I have ever owned, I suspect the 310 is similar. The power rating of my 510 also feels conservative relative to my older Arcam AVR. ARC is the real deal, and bass integration is phenomenal. Not as much concerned with the specs. as I am with the sound!