Truly unique combination of capabilities, quality and level of integration, no real competition exists for the AC650 as you get full, easy to use control over the drivers (6 minimum, more with external amp). Direct import of REW filters is a killer. The software makes DSP control a breeze. True one stop shop with no obvious weak spots.

A truly efficient and flexible tool for speaker building and tuning. It also comes with fantastic customer service from Stas after the sale! Great bargain for the speaker builder.

This thing is pretty unbelievable for the $ these guys are charging. Super powerful dsp program, easy to use and configure. Nicely built chassis and knobs. Decent amplifier power, good for most users. Clever implementation of Phoenix connectors. Lots of outputs. I bought one, and then bought a second one for another room.

One big complaint for the next version is lack of analog inputs. I'd really like to be able to connect this to the preamp output of my receiver for home theater, and I can imagine users wanting to connect a turntable which is tricky.

I bought this unit to help with a large 3 way horn project where I wasn’t sure what the crossover points would end up being and with the length of the horn I knew I would need some time correction. Enter DSP. The 6 amplified channels are perfect for this project and the mix of other outputs has me thinking about easy future enhancements.

What I didn’t expect was how easy and convenient it is to use. The app lets you adjust everything in real time for an immediacy I’ve not experienced before. I’m looking forward to interactively measuring and tuning my build. The way it works allows for all kinds of remote placements as well. If you have wifi, you can wake it up remotely and enjoy it. No need for line of sight with an IR remote.

Honestly, this thing is awesome for loudspeaker development but having used it, I now see lots of other applications I can use it for as well. Thank you Acoustas for thinking outside the box and bringing something unique to the market.

App is very easy to use, well written. Amp does exactly what is supposed to do, very compact with high quality construction. As a DIY speaker builder, I am using the amp to identity crossover parameters for optimal performance before designing a passive crossover - so much better than trial and error. It is a well designed, excellent product and I expect to use it for additional purposes over time.

Just hooked up unit to a three way system. Heil ESS tweeter, Morel carbon fiber midrange, Peerless 10 inch woofer. Sounds great and the flexibility is amazing. Have not had a chance to do measurements yet, so the potential is greater than an already excellent sound. Highly recommended.

I haven't been this excited in a long time after making an audio purchase! Received my unit and am blown away with the build quality, not to mention this thing could have survived any kind of shipping thrown at it. Very well packaged! I am in the process of building some speakers and will be utilizing the unit for power and crossovers. Can't wait until everything is all done! Thanks for making the process very easy from ordering to delivery to a very well executed product!

I wanted to include some pics. These custom speakers are far from perfect, but I have them bi-amped and have been tuning them with the AC650 phone app along with REW and a measurement mic and it is incredible how many imperfections I was able to fix with these old speakers. Next up, using the extra 2 channels to power some old music monitors and then getting these speakers integrated into my digital mixer for music jams!
Note the AC650 is sitting on the right leslie. The big black and blue speakers are the ones powered by the AC650 right now.

I wanted modern features with my vintage phono setup and the AC650 is perfect after I added a AD converter to get my phono preamp to optical.
This system alone can run 3 sets of my favorite old speakers all over the house. That clears up my other AC650 for workshop so I can continue to tune of custom and vintage speakers.
It felt a little strange at first because even with the phono preamp and receiver there was still virtually no noise. The AC650 is so clean and clear it sounds great paired with the vintage speakers for a amazing and fun turntable setup that you can still just use bluetooth and spotify if you want to be lazy!
Im looking forward to doing some speaker and room measurements and really tuning this in.

I took a leap of faith on the amp since I've never heard of the brand before but really liked the concept and it's built in USA. Ever since getting it, I've been listening to it latterly everyday and one way or another. I have first tri-amped my Klipschs RP-8000F II with it since I thought I can get more out of them, bypassing their crossovers and wow what a difference. I set my own crossovers and did my own measurements. Now I am finishing my build of my own 2.5/3-ways and I am never going back. I really like how everything is implemented, just simple and the sound is really neutral like a clean canvas or I can add or subtract and shape it to wherever I like. Very soon here I'll be getting another one specifically for my build.

Just got this Amp on Friday and had the weekend to play with it. It was fairly easy hook up my Maggies to it and to get it on my Wi-Fi network. Once I did, what a change. The sound is really transparent with new level to the soundstage. I played with the controls and I feel like I've got it. it is handy to control everything from my phone. Tuned in just right. It is a major improvement over my Technics SU-G700M2 that I like very much as well but after playing around with the settings, there is a big difference. It sounds so much more open and real. Live music is my favorite so far. We listen/watched Kacey Musgraves live in studio consert and wow what a difference it was lovely.
The only thing I will need to figure out is the phono input. That's the only thing I think is missing. However, I am thinking about the Music Hall PA2.2 I might try that one since it has USB out. The Pro-ject Optical Box E looks to be good option but need to do more homework. Anyway so far so good. The app implementation is by far the best I've ever tried on any audio gear. I mostly use it to control the basics like on Austin volume but there's so much you can do. It's pretty exciting actually. I'm really happy with it so far.

I just got my second AC650 Amplifier. It sounds great, set up is easy, being able to bi-amp old speakers and tune them is amazing. One of my AC650s will run our living room speakers as well as some kitchen speakers. The second AC650 is for testing/workshop purposes as well as running my homebuilt studio monitors in biamp mode and maybe triamp with some subs. Really excited to get these tunes up and sounding better than ever!
From a technical perspective this amplifier is amazing, instantly works with computers, bluetooth, any usb type device, Has insanely low noise, 6 Channels @50 Watts, it sounds amazing, I had previously been using a cheaper digital amp and was happy with it, but this is way better, and again the app and setup is so easy to use.
I will update this review as I learn more, but already convinced it is a great deal.

I've had it for just over 2 months and I built a three-way stereo system using SB audience and Purifi drivers. I love how you can just tune everything using the app. It is so fast I can AB anything. If I mess anything up, I can just go to one of my presets and I'm right back. I used REW to measure each drivers and tuned with the DSPamp. Highly recommend it!

I've been building speakers for the last 10 years and this amp is exactly what I was looking for. It sounds absolutly incredible. Extremely detailed and holographic sound. There is zero noise even at full volume. The app is well thought out. I am super happy all around with the quility of sound especially. The customer service is the best I have ever experienced. They actually picked up the phone and literally walked me through everything and gave me tips on the type of crossovers and settings to try with my set up. I went with the recommendation of using Linkwits and Rily 12dB/Octave and inverting one of the drivers. Wow, it sounds good. I have AC650 in black amps since Christmas of 2024 and we play this amp everyday and love it. Will defenitly get another one for the next project I have to pick out the speakers first. Anyways, keep up the good work.

This DSP amplifier is nothing short of a masterpiece and an incredible value for the price. I opted for the white finish to match my studio, and it looks stunning. Honestly, I wouldn't be surprised if the price goes up as more people discover just how good this amp is.
Since integrating it into my setup, my studio sound amazing. It's completely blew my mind and the band. I'm recording right now. Previously, I was using ARC for room correction, which worked well, but switching to REW paired with this amp has been a game-changer. The level of control this amp offers is remarkable. I can fine-tune everything driver crossovers, time alignment, and per-driver EQs all in real time.

Now the soundstage feels significantly deeper and more natural. Instrument placement is precise, and the overall listening experience is on another level. The ability to tweak settings live makes it an absolute joy to use.