OSD Nero HTA4200 Multi Channel (4X) 200W/Ch Home Theater Amplifier, Bridgeable 300W/Ch

If you're looking for a powerful 2-channel amplifier or need a 4-channel amp with sufficient power for surround and/or height speakers, I highly recommend the HTA4200. I normally use a Lexicon LX-5 (5 channels with 200watts/channel @8ohms) to power my front, center, and surround speakers. Unfortunately, it needs service, and I don't want to burden my Marantz 7011 receiver with another 5 speakers. The HTA4200's big brother, the 7-channel HTA7200, received a glowing review in (now defunct) Sound and Vision magazine for both its build and audio qualities. The HTA4200 has the same per-channel power rating as the HTA7200 but offers something the 7200 does not: the ability to bridge channels. Right now, I have the 4200 set up as a stereo (300watts/8ohms per channel) amplifier. Everything is clearly marked on the back panel and only requires flicking a couple toggle switches. Just be aware that the (+) and (-) speaker terminals are now about 4 inches apart. So far, this amp sounds almost identical to my Lexicon which cost close to 10 times the HTA4200 (and that was 20 years ago!). This amp came double boxed with handholds on the outer one, something all heavy electronics should employ. I intend to return the HTA4200 to 4-channel duty when I get the Lexicon back. This amp is a fantastic buy compared to what you'll pay for a similar "name-brand" model.One thing that drove me nuts, and it's not explained well in the online manual. If you want to use the trigger function you must set the associated toggle switch to OFF.Note: I don't know if Amazon is aware of this but I'm sure manufacturers are, new FCC rules state that power ratings for amplifiers and receivers must be given at 8-ohms (not 4 or 6) with all channels driven at multiple points in the frequency range, not just the usual 1kHz. These rules have been in effect for almost a year now but there seems to be little compliance.Update: After using this amplifier in bridged mode for over a week, I have a better feel for its characteristics. First let me say that regardless of how loud I pushed this amp, it was never hot to the touch and the sound never harsh or distorted. As with most Class-AB amps, bridging two channels increases volume by ~6dB. While the amp produces detailed music with a wide soundstage, it appears to emphasis the lower frequencies. The bass is distinct, never boomy, but definitely more pronounced than the Lexicon or Marantz. I had to reduce the bass level for my front speakers because they have powered 8-inch woofers and are rated down to 34 Hz. I followed up with the surrounds which have passive 8" woofers with similar results. Next up were the surround backs (bookshelf speakers) with 5.5" mid-bass drivers. In this case, these speakers never sounded better, with a richer bottom end than either the Lexicon or Marantz ever produced. I then took the HTA 4200 out of bridged mode and used it to power 4 ceiling speakers with 6.5" drivers with similar results. I verified my subjective listening using Audessey room correction. Normally it puts the cut-off on the surround back and ceiling speakers at 80 Hz. With the HTA 4200 the cut-off was now 60 Hz (these speakers are rated at 45 and 47 Hz, respectively).In my opinion, while the HTA 4200 might not be a great match for floor-standing speakers with large woofers, it can really make smaller speakers come alive with its clean, powerful bottom end. Some may actually prefer its sound with large speakers. It's all a matter of taste. One thing for sure, you get a great-sounding amplifier with plenty of power for your money.

Bought this due to Youthman's youtube channel $799 special code that day. Was on the fence on getting the monoprice 7x200 $1850 amp, but at these prices its hard to beat. Paired this unit with Onkyo RZ50 at$999 so was able to get receiver and amp for same price as just monoprice amp by itself.Sound is clean and strong. Pushing a pair of old school ADS 1590's for right and left and polk lsiM706c for centers and ADS 1290s in rear. Thought the 145 watt per channel vs monoprice 200 watt per channel wouldn't be enough but its good enough for me.Sound details in Ready Player One was phenomenal. Cranked it up loud and still had room to go before I had to turn it down. If your audiophile on a budget definitely i say go for this power amp.

This thing rocks. I offloaded 7 of the 10 channels onto this amp and it sounds dynamic and full. Super solid device.

I purchased this item thinking I was going to get 210 wpc, then after receiving it I overlooked that is 210 wpc at 4 ohms. This is only 145 wpc at 8 ohm across all channels. I will keep this amp to power other height speakers. I just purchased an emotivia xpa4 gen 3 that is 4 channels 260wpc at 8 ohms. I need the power to help drive 2 pair of bose 901 series sixes. the loudspeakers need the power. 145 wpc is not enough as i can hear the clipping when turning up the audio as there is not enough power to drive the loud speakers. Decent amp for the price to help drive the speakers that can't handle the power like the 901s need and can. Be mindful what you are purchasing.

I am finally able to run the amp with my demon receiver. Initially when I set things up I was getting humming sound through my speakers. To make a long story short, invest in good speaker wires, get a hum no adapter and make sure to connect all your devices into the same power strip that goes into the outlet. This amp also does not get hot from my experience. Everything is working great as expected.

Sounds great! However, amp went into protection mode after 1 day of use. Will not stay in the on position. Low quality control. I do not recommend this amp.

140 watts per channel for my SVS prime elevation speakers. The 4 channel OSD amp is perfect for my Dolby Atmos setup. I also own their 3 and 5 channel amps. So when I heard they were making a 4 channel also I didn't hesitate when I saw it on Amazon. 5 stars.

I had a Marantz 5 channel amp that developed an issue with the first channel, and given current economic conditions I was loathe to invest in an expensive 5 channel amplifier. HT is not stereo and I felt no need to purchase a class a solid state or some other high performer. I was also unwilling to swap from XLR to RCA and found this amp on Amazon. Performance wise it exceeds the nearly double the cost Marantz that it replaced. It drives an 86db/1 watt 90 lb center channel without so much as getting warm and if there's noise, well... I can't hear it. AB amps in this day and age should not be rocket science. This amp delivers. I feel like I robbed someone.