MarantzModel M1 Wireless Streaming Amplifier with HEOS Built In

for a simple stereo streaming audio amplifier, this is a revolutionary device. it has clean and authoritative power. has many custom features and just the right amount of connectivity. once set, it performs flawlessly regardless of the source with great detail and clarity. it's so small you with its auto signal sensing, it performs as one with everything connected, not as an external device

Unfortunately, the M1 makes a lot of hiss. There is also a phaser-like noise when the M1 is at idle. I tried two different units, and they both had this problem, so I sent both of them back. I have since learned that this problem may be solved via a firmware update. I'll wait and see. If Marantz can fix the noise problem with an update, then I will definitely purchase another unit.

I have several Denon home 250 speakers sprinkled throughout my house, and a marantz av preprocessor attached to my TV.I wanted to add synchronized audio to my backyard, so I paired this with two B&W AM-1 speakers. The Marantz M1 paired with these is fantastic!I briefly compared to the Denon Heos HS2 amp. For backyard music, I didn't want to care too much about sound quality -- and my neighbors would probably like if I didn't care too much about volume or bass. So I was hoping the significantly cheaper Heos Amp would fit the bill. But the A/B comparison took me about 30 seconds to pick the Marantz M1.I plugged in the Denon HS2 first. The HS2 was, well, perfectly acceptable. It did just fine. The bass was a bit lacking -- but what did I want from a pair of smallish AM-1s in an outdoor environment? Just what the neighbors would want....The M1 was next. In addition to being *way* louder when pushed, the M1 just has much better control over everything. The bass is deeper and more powerful, surprising me with what the AM-1's can do in a small backyard. Vocals were clearer, and the music just sounded so much better. It was a HUGE difference, and way more then I'd expect in a somewhat noisy outdoor location, and with only 30 watts (officially) difference in output.The M1 is awesome for my purpose. It's small, sounds fantastic, and integrates with the rest of the house.

Amazing quality, the virtualization alone sells this product. Really brings it to life and is comparable to an 11.1.4. If money isn’t an issue and want ease of life I’d recommend

The Marantz M1 delivers a wide and deep soundstage with detailed highs and nuanced mids and lows, providing powerful performance without distortion. I’m using it with KEF LS50 Metas and a KEF Micro Sub, and while I wish the HEOS app included a parametric EQ, it’s still great to have independent frequency management for both the paired speakers and the sub. That said, using Tidal Connect through HEOS isn’t as smooth as it was with the Bluesound Node I had connected to the Rega IO.This may be controversial for purists, but I definitely prefer how vinyl sounds through the M1 compared to the analog direct on the Rega IO, even using the same phono stage.Overall, highly recommended. (Btw, I had ChatGPT edit my writing, so while robotic, it’s a real review)

1/1/25: Now required to have login/password to operate this unit. Please advise on where to return it for a full refund. This is now a HUGE security risk to my home network and business. We don't want Marantz tracking us. Went through this with Sonos, joined class action lawsuit, sent everything back for a full refund years after buying it. My lexus does not ask for login/password when I drive it, nor should my oven, refrigerator or amplifier.

Solid build, works great. HEOS has been fine for me. Drives my Revel F36 and SVS sub beautifully. Using with Sony TV via HDMI and Apple TV.

Yes, this unit sounds great. It sounds better than the various class D chip amps around the house (Aiyima A07, Topping MX3S, WiiM Amp) as well as a Denon X2600H AVR. The M1 is actually using a custom Axign class D. My Revel M16's, Emotiva B1+'s, and PSB Alpha P3's have never sounded better. And one of the reasons I bought the M1 was due to it's bass management (separate HPF for the mains and LPF for the subwoofer). However, the HPF on my unit was not working properly and so I had to return this otherwise great amp.High Pass Filters should only affect the main speakers, but on my unit it was also affecting the subwoofer output. If I set the HPF to off, the subwoofer would still function properly. However, the higher I set the HPF, the lower the volume on the sub became. HPF properly cut the lower frequencies on the mains, but it was doing the same thing to my subwoofer.As a test, I set the HPF to 150hz for the mains and LPF to 120hz for the sub. Then I played a 40hz test tone. When the HPF was set to off, the sub played the 40hz tone with no issues. However, when I activated the HPF and set it to 150hz, the subwoofer basically became inaudible. I tested with 2 different subs (both in LFE mode) and this was the case.Even after factory resetting the unit twice, this HPF issue with the sub was still occurring. Marantz phone customer support couldn't help me, and they suggested that I just return my unit, which is what I did. Overall not sure if this issue affected only my particular unit only or not, but it's a shame for an otherwise great-sounding amp. Will continue to follow this product to see if this issue is more widespread or not.UPDATE 8/9/2024: Marantz email support confirmed the problem, saying "Our engineering team has confirmed that this High Pass Filter behavior is an issue which needs to be addressed. They will correct it on the next firmware update which usually roll out on a monthly basis, however this update may go live within the next couple weeks."So yes, as of this writing this is currently a widespread issue. I may look into re-purchasing this unit down the road after the fix is rolled out, and if more features are introduced into the HEOS app (such as PEQ, room correction, Google cast, etc., all of which the WIIM have). I would love a compact unit that has the M1's sound quality with the WiiM's brains.