I've waited for several weeks so I could use the AT-600 after the 2 FW updates to post a fair review. Coming from an Onkyo RZ70 using Dirac + DLBC that performed well, I was pleasantly surprised with the slight improvements of a little more detail in sound, improved channel separation as well as more bass impact. RZ70 had to use +10 bass boost to achieve adequate bass and AT-600 I have set to flat with the same results! Very happy with that. As other users have reported on forums, my AT-600 also has occasional issues with losing audio, and lip sync misalignment when switching sources however this is remedied through switching inputs or restarting my Amazon streamer. Yes it takes longer to initialize when turning on vs competing products, more cumbersome with USB FW updates, still has some room for improvement in stability but overall I am happy with my purchase. As is well known, Amir is a pleasure doing business with and I recommend considering the AT-600.
Processing of the signals is outstanding. Labels on the rear were not correct, and the limited instructions led to three days of setup sessions before I figured out what was causing the wrong speakers to fire. The company that sold it to me is outstanding to work with, and you get to speak to the owner himself, on an actual phone call. If it weren’t for the setup frustration and poor instructions it would be a five all the way.
It took me several days to get the system working correctly. This is because the silk screen labels on the back of the equipment do not necessarily match the real layout of the processor outputs and amp outputs. I had to mix and match cables to various labels that were incorrect. However, once I got this all figured out, the system produces outstanding sound. I am not yet finished running all of my more intricate tests, but I do have enough listening invested to know that the ATT 600 and the 11 channel amplifier that I purchased are producing as advertised. Aamir is fantastic to work with. He will speak with you personally and walk you through anything you need.
Excellent transaction!
So much better than I expected.
Summit Hi-Fi "A11" Gen 2 – 11-Channel Toroidal Power Amp with 10.1" Display – Sold Out
Amir was absolutely stellar making this happen and was on top of his game from A2 inquiry to deliverable. Top quality audiophile 2 channel amplifier. Not too many gadgets to worry about setting up. Plug and play or connect your favorite pre-amp DAC for your streaming requirements and it's great sounding. Finding the matching pre-amp and speakers to optimise this beasts audiophile power is key to finding your sweet spot sound. Can't wait for Summit tower speaker line up to hit the market soon to go with the A2. Thanks Amir for this gem
Receiver Unit very quickly, after installing in the rest of the system and setting it up, the unit made a significant difference on how the whole system sounds. The unit is coupled to an AD-8300. As usual dealing with Aamir was a pleasure, his willingness to please you as a costumer is second to none.
This unit is giving me phenomenal sound quality (dynamics, channel separation, accuracy, clarity, etc). I can't imagine spending double the price (or more) to get what this unit provides. Also, you can't get any better customer service than you're going to get with Summit Hifi. Aamir (the owner of the company) cares about his customers and makes himself available to them. This is the direct opposite of other AV companies that basically only take customer support emails and then take 4-5 days to get back to you, only to find out that their answer wasn't very helpful. Add in that this unit comes with the full Dirac suite at no extra charge, and I think this is a no-brainer if you're in the market for an AV processor.
Quality amplifier. Customer service was excellent got it shipped to me in less than a week.
Best av processor yet
This sub works well in a small space. I would again recommend Summit hifi and Aamir for your audio needs.
Awesome preamp processor fantastice value and performance
I cannot be happier with the performance and clarity of this amplifier. It pushes 6ohm speakers @ 86db with no problem. I didn’t expect it to enhance the clarity of the highs while maintaining unbelievably accurate and punchy lows. I am going to grab my second P7 soon. Thank you Aamir and SummitHiFi!
SummitHiFi is a class act. This processor is as advertised, with several future uogrades a dn uodates coming, I am a true fan. Aamir at SummitHiFi is much if the reason I went with this ordwr, along with an amplifier. Toy cannot beat his customer service. Simply the best!
Phenomenal crisp, clean sound for my L C R…Tremendous value as always from Aamir and Tonewinner…! Highly highly recommended! Thanks Aamir!
D 4000. Omg what a sub owned for year now still rocks the whole entire courtyard in co op you wanna talk shaking house and deep base great controls way use a must buy I'm a paridigm guy my whole life this is a must have this subwoofer warrenty is iron clad they are easy to contact any issues these guys got you you need this subwoofer must I say anything else pm me dam this subwoofer is top tear
I am very happy of my uhd800 Zidoo.
Combined with the great service from Summit,
I am very happy with my purchase.
Amazing amp and built like a tank!
I actually love the processor but I got to be honest. It's a little challenging to setup and I still can't get it to recognize more than 1 subwoofer.
Absolutely the best part of my system! It's a beast and there's no volume level it can't handle!
I received my Ad-1pa November of 2025 and I was immediately impressed with rich, full, and detailed sound right out of the box. Today is 7-24-26, and I waited this long to see if I had any problems with the amp. This is amp is rock solid and stable, and it looks great in my setup, hell it looks an operate so well I would like to add another one and by-amp them. But buying another one would be overkill, for I’m running KLIPSCH KLF 20 a very efficient speaker and if I did buy another one I would only gain a little more headroom. I hear more detail and nuances in the music, and the Ad-1pa is rock solid performer, and I haven’t been more happier.
Lil Benny.
I have been using this for over 10mo now and absolutely enjoy it. To provide some context of my use, it starts with home theater of course. This is my primary amp for the following; Marantz AV8805 processor, A11 gen2 amp, Monolith 9x amp, and 15 channel layout (13.2 active at a time).
This amp has no noise floor that I can hear. It just works as advertised and my system has performed fantastic without any issues ever related to this amp. In fairness, the Monolith 9x has been a performer as well, but I prefer the A11 which is powering the front stage and and 5 overhead speakers ( 5th is only active in Auro3D) the rest of the overheads and bed layer are powered by the Monolith 9x.
The screen with VU functionality is pretty cool too.
The unit barely gets warm after watching extended cut LOTR trilogy marathon. Which is great.
I don't know how Summit HiFi is able to pass on such a bargain. All I know is I do not regret the purchase. I'm considering buying another to replace the Monolith. Only for matching the appearance of my setup. For the price. I definitely recommend it for anyone needing or wanting to do separates.
