OSD Audio Nero XMAX11 Class A/B 11-Ch Home Theater Amplifier, 3X 310W + 8X 135W, 2X Toroidal Transformers, XLR/RCA Inputs

I tried the OSD Nero XMAX-11 for about a week in my home theater (11 channels, external processor, multiple subs), using RCA connections. My unit had a serious problem: the AMP 8/9 module repeatedly shut down during movie playback, especially during dynamic scenes — even at moderate levels (around –10 dB on a Denon X3800H). Once it shut down, the channel stayed dead until the amp was fully power-cycled, which strongly suggests a protection fault. I swapped speakers, inputs, and wiring, and the problem always stayed with the same amp module. All other channels worked normally. In practice, this made the amp unusable in a multi-channel system. A few other notes: -The front display backlight is always on. You can turn off the meter, but the backlight stays lit, which is distracting in a dark room. -Customer service responded, but replies took several days. -Amazon’s return was easy, though shipping a very heavy amp back wasn’t fun. On paper this amp looks like a good value, but reliability matters more than specs. I ultimately returned it and went with a Monolith 11X that has been completely stable. Bottom line: Based on my experience with repeated channel shutdowns, I wouldn’t trust this amp in a serious home theater.

Super great sound. My home theater sounds more clear you can hear the voice perfectly as if you are inside a big cinema

HTA5200. Class A/B, no-frills, monster among beasts. It looks menacing in the best way. Using 4 of its 5 Amplifiers to power 4 of the beautiful Klipsch RF7-II Tower's (8ohm 250w Continous). I mainly listen to very busy, intense, high bitrate music w/ deep and unrelenting subsonic bass. The OSD Nero HTA5200 is up for the task. It'll easily handle the less demanding cinema signals. All of the connections are robust and feel very firm. Trying RCA and XLR to compare and because I'm an idiot and two of my patch cables are too short. Can't tell any difference in quality. If there was a problem with noise introduction or distortion, I'd know. It would be very obvious when connected to the Klipsch towers because they are so sensitive/efficient. 101db @ 1m / 1w.

It's a good amp for the price charged. The rated (2-Channel) power level seems about right. I use it paired with a 7.1 Marantz pre-amp. It's quite, and runs my JBL - Polk - Bose Front/Surround/Rear speakers with volume to spare. It is quiet when no sound is input. Compared to my last home theater amp, an 11-year-old Outlaw amp, this Nero is a tank. Think the Outlaw weighed close to fifty pounds but this monster is closer to 70. Amazon delivered in in a truck with a power lift (!). I'm running it with balanced connectors instead of RCA jacks. Would buy again.

Super ampli, fonctionne très bien. Livraison rapide.