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Marantz MM7055 Power Amplifier – 5-Channel Amp for Ultimate Home Theater & Audio Systems | High-Power Capability, Quality & Design | Gold-Plated Terminals
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- THE POWERHOUSE FOR YOUR HOME THEATER, this 5-CHANNEL AMPLIFIER delivers immense power and detail at 140 watts per channel into 8 ohms. Audiophile-grade, gold-plated, 4-way binding post terminals ensure that the connections are secure and power-packed
- IMMERSIVE CINEMATIC EXPERIENCE – For a thrilling home theater experience, pair it with the AV7005 pre-amp/processor, or for a more complex system, add one or more MM7025s for an advanced 7.1 or 9.1 surround sound and audio experience
- All that power requires a DEDICATED COOLING UNIT to remove the excessive heat generated. The output stages are mounted on an aluminum 'thermal tunnel' that DRAWS OUT ALL THE HEAT for long term reliability and quiet operations even while music is playing
- EASY INSTALLATION AND SETUP – Unbox the amp, power it on, plug the audio source you want to hear and start enjoying great music instantly. Choose between balanced XLR and unbalanced RCA inputs, and configure each channel to your choice of input connector
- With 60 YEARS OF INNOVATION and DEDICATION towards designing PREMIUM RANGE OF HOME THEATER ENTERTAINMENT AND AUDIO SYSTEMS, Marantz Power Amplifiers give you a massive boost to your surround sound and stereo listening experience
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Marantz mm7055 5 Channel power amplifier, black The mm7055 is no ordinary multi channel amplifier, stuffed with amplifier boards derived from the Marantz Reference sm 11 amplifier, the mm7055 sounds bigger, better and more musical than any mutely channel amplifier at this price has a right to. Themm7055 has power aplenty, too, with 140WPC on tap and a massive EI Core transformer delivering gobs of current into even the hardest loads. The mm7055 is no ordinary multi channel amplifier, stuffed with amplifier boards derived from the Marantz Reference sm 11 amplifier, the mm7055 sounds bigger, better and more musical than any mutely channel amplifier at this price has a right to. Themm7055 has power aplenty, too, with 140WPC on tap and a massive EI Core transformer delivering gobs of current into even the hardest loads. Complementing the beauty within is a gorgeous faceplate, part of Marantz's new aesthetic; A composite of aluminum and non resonant resin, this rounded look with the REFERENCE Series trademark porthole power light gives Themm7055 a gloriously retro look with modern appeal.
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I haven't had any issues with mine and I never turn it off. The pre-amp is the Marants AV 7705
As far as build quality, it goes without saying that its build is quite proper. This is a Marantz after all. It feels solid and is solid all around. I've been using it for almost a year and occasionally at full throttle. It has not flinched or faltered in any way, shape, or form. Those tower speakers aren't the easiest to drive and this amp pushes them effortlessly, and with room to spare. At 10 feet away the room correction software set those channels to -2 & -2.5. So, if you're in a similar space this amp is plenty -- even moreso with speakers that need less power. Those are 2 dedicated 5x7 subwoofers in those towers and they pound with this amp.
So, in this price range people want some things that this amp doesn't have as far as paper specs go. First it's an EI transformer as opposed to toroidal. Also, its noise specs along with damping factor and power with all channels driven seem a little flakey compared to its competitors. Also, it weighs barely over 30 lbs -- making it not much heavier than many A/V receivers. A lot of folks factor weight into an amp's potential, which is understandable in some respects.
So, here's the thing: that's a big EI transformer. It's way bigger than the ones in AV receivers rated at 125 /chann anyway. I haven't personally inspected AVRs with 140 wpc ratings, but their EI transformers in the pics don't look as big as the one in this amp. It's huge.
Its capacitors, which I guess are part of the whole power output formula, are also huge. 65,000uf in total. Compare that to the Marantz flagship receiver rated at 140 watts/chann, which has total capacitance of 44,000uf. When I peeked inside this amp, those two big R2D2 looking things jumped right out at me and assured me that all was well.
Weight....it has less to do with the power output and more to do with the construction. Marantz decided to skip putting adequate heatsinks in there. Instead they utilized an aluminum "cooling tunnel" that snakes around the inside of the amp. A fan blows into the tunnel, spreading chill vibes all around. It seems to work. The amp stays a lot cooler than the AVR, and the AVR isn't even powering any channels, lol. I think it's actually the DSPs that are heating up the AVR. I dunno. But the amp weighs less than typical for its output due to the lack of heavy heatsink weight. Also, the lack of heatsinks is why this amp is not spec’d at 4 ohms. I think Marantz does say it can do 4 ohms, but I guess it isn’t recommended.
S/N, thd, damping, etc....not bad by any stretch, but leaving something to be desired just looking at the specs alone. That's when "niche market" comes into play. What you're paying for with this amp are 1.) the renowned "Marantz sound," 2.) those fancy XLR inputs, and 3.) a lot more power than the vast majority of a/v receivers can offer. You’ll notice that a lot of circuitry and wiring went into to the proper set-up of the XLRs. If you don't plan on using them, then it just makes you wonder if $1,199 is the right price.
And, yes, the "Marantz sound" is definitely there. In addition to the obvious power boost adding to the dynamic range and stage, the propriety HDAM circuity found in Marantz products imparts a very noticeable "warmth" onto everything--and I mean everything. The sonic characteristic of my home theater was completely transformed.
....transformed for better or worse is the age-old debate. Many audiophiles have a special place in their hearts for the Marantz "warmth." Others don't, believing it's a form of coloration if not just some marketing gimmick. Marantz claims that its proprietary HDAM circuity "buffers" noise. What I will say is that it does sound quite nice, and it does not --as far as I know-- introduce any distortion. Nuances are not only clear, but also more clear when compared to running things with the AVR alone. If you believeth in the HDAM, then I guess the logic is that the buffering adds realism, and that said realism is revealed through a softness of auditory texture. It's like playing vinyl through a tube amp but not really. Sony during the 1980s experimented with making their CD players sound like vinyl, but then abandoned the idea. That's another discussion.
So, for $1,199, you get 1.) plenty of power output compared to even higher end A/V receiver internal amps 2.) the Marantz "warmth," and 3.) a seriously stylish amp that looks fantastic in the living room. Also....XLR inputs if you want 'em.