MRX 720 =headroom without toroid, power without heat ??
was surprised to see how much headroom this amp has driving 5 amp speakers-- I know anthem has a rep not to cook power ratings, but when bench tested in reviews seemed to be spot on accurate. What really surprised me is how cool it runs (impossible to get above 84 degrees in my experience in an open setting and its internal fan never runs) compared to my previous HK AVR 8000 (one of those TRUE beast 50-pound units from 10+ years go with 2 heat sinks the size of a quart of milk and a toroidal the size of a grapefruit- ran like an oven, needed a fan for sure...but STILL sounds great....I dont see any difference at all in headroom (no surprise there as they bench tested similarly and conservatively) but anthem is way smaller, lighter, no toroidal -I know it has 2/7 amps class D, but I've never run seven speakers on either AVR setup. I know anthem uses toroidal on their 1120 (certainly to save space in the same chassis)and certainly their amps, but how do they get this much power out of an AB topology without a toroid and NOT without generating much heat? ANd i can't find anything wrong with the straight core transformer being used in the 720, causing me to reflect that toroids are not necessarily ALL superior when you have a solid company like anthem doing the implementation.
I've been driving my MK 150 setup pretty hard past few weeks without any heard distortion to 100 dbs at 11 feet (but not for long as I can't handle it !)-Id be hard pressed to move onto separate amps with this set up- needless to say, the decoding and processing are a major upgrade from the avm 8000.
ANthem AVRS are certainly not price competitively with other brands BUT they are certainly very price competitive compared to separates. And with their cool running topology don't think they will .Anyone contemplating buying separates imo needs to audition the MVX line first.
Anyone with a grasp of modem AB topology and esp anthems approaches I would love to hear your/ thoughts explanation. I know first hand MANY of the larger brands using AB DO run hot even with current models (just go to best buy and touch the top of a sony, etc). what is anthem doing differently? and how are they getting this headroom without a toroid ??