The AC650 is a DSP amplifier with 10 addressable channels. It features 6 powered channels, each delivering 50 Watts RMS, along with 2 RCA outputs and 2 optical outputs for external amplification, subwoofers and system expansion.
With the AC650, you can build fully active speakers and fine-tune multi-way, multi-driver speaker systems, eliminating the need for passive crossovers. Each driver can be individually tuned and powered, making the AC650 the perfect solution for both proficient speaker builders and beginners alike.
Key features include:
- Set channel’s crossovers, gain, invert, time alignment, equalizers, A/B testing, and presets
- Control On/Off, Volume and Tone Control via Acoustas App
- The App is WiFi controlled for quick and easy tuning of 2-way, 3-way, or larger speaker systems, available on most modern devices
- Daisy-chaining multiple AC650 units via Optical S/PDIF at 24bit/192kHz for expanded channel capacity
- New features are in the works such as FIR profile coming soon via App OTA
It is designed and assembled in the USA 🇺🇸 from the ground up by our incredible team.
Acoustas AC650 DSP Amplifier - Onyx
The Acoustas AC650 in Onyx is a high-performance DSP amplifier meticulously designed for speaker builders who demand precision, versatility, and value. Featuring a 10-channel speaker manager and a 6-channel amplifier, it provides all the tools needed to fine-tune multi-way speaker systems. From configuring crossover points to applying a 15-band PEQ per channel, the AC650 gives you the power to craft your ideal sound right from the palm of your hand.
Easily control your system via WiFi using iPhone, macOS, or Android devices. The AC650 is built with a refined signal path utilizing I2S technology, ensuring the shortest and cleanest route from source to signal processor to amplifier. This innovative design minimizes noise and maximizes audio fidelity, delivering an immersive listening experience comparable to premium Hi-Fi systems at a fraction of the cost and 100% more fun.
Every feature, from crossovers to equalizers, is rigorously tested and supported by detailed measurements and a comprehensive technical report, ensuring reliable, consistent, and professional-grade performance.
Proudly designed and assembled in the USA, the AC650 comes with a 30-day risk-free guarantee. If it doesn’t exceed your expectations, simply return it in its original condition for a full refund. Additionally, our team in Richmond, Virginia, is always available to answer your questions and provide expert support.
As a future-proof solution, the AC650 evolves with ongoing app updates, introducing new features and enhancements to ensure your system remains at the forefront of audio technology.
Acoustas AC650's Two Year Warranty
Acoustas AC650's Two Year Warranty
At Acoustas, we value each of our customers and are dedicated to offering the highest level of customer service. We will do our best to address each claim promptly and effectively, working directly with customers to resolve any issues to the best of our ability. We strive to provide personalized support and ensure a positive experience, making sure that our customers receive the best possible solution for their needs. (Link to Warranty Info)
30 Day No Hassle Return Policy
30 Day No Hassle Return Policy
Acoustas Return Policy – Hassle-Free & Customer-Focused
We want you to love your Acoustas purchase, but if it’s not the perfect fit, you have 30 days to return it—no questions asked. As long as your item is in its original condition, in its original packaging, and accompanied by proof of purchase, we’ll issue a full refund to your original payment method. If your product arrives damaged or defective, we’ll take care of it with a free exchange or refund. Just reach out to info@acoustas.com, and we’ll handle the rest! (Link to the Acoustas Return Policy )
Free Shipping
Free Shipping
Acoustas offers free standard shipping on the AC650 Amplifier to all 50 U.S. states, Canada, and all countries where we sell our products. Orders are typically processed within 1-3 business days, with delivery times of 2-3 business days within the U.S., 5-10 business days or faster in Canada depending on customs. If an order requires additional processing time, we will notify the customer via email. Customers are responsible for any applicable duties, taxes, or import fees on international orders. For any shipping inquiries, contact us at info@acoustas.com.
Customer Reviews
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 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.
Acoustas AC650 - Deluxe Mini in Stealth Black
The Acoustas AC650 is a premium DSP amplifier designed specifically for speaker builders who demand precision and versatility. With a 10-channel speaker manager and 6 powered channels, it empowers you to fine-tune your system with unparalleled ease. Effortlessly manage crossovers, set PEQs, perform live tuning, and A/B test presets in real-time via WiFi - hearing the difference as you go.
This amplifier offers seamless control through your iPhone, iPad, macOS, Android, and Windows (coming soon) devices. It comes equipped with high-quality components, including Acoustas Cables, a CUI Inc. power supply, and a premium Stealth Black finish for a sleek and modern aesthetic.
Engineered for superior performance, the AC650 features a refined signal path that utilizes I2S technology to maintain the lowest noise levels and ensure pristine audio quality. Every feature, from crossovers to equalizers, is meticulously measured and validated, and the unit includes a comprehensive technical report so you can trust the reliability of its controls.
Proudly designed and assembled in the USA, the AC650 is backed by a 30-day risk-free guarantee - if you don’t love it, return it in its original condition for a full refund. Plus, we’re here for you with local support from our team in Richmond, Virginia, ready to answer any questions.
As a future-proof solution, the AC650 evolves with regular updates to our app, ensuring you’ll enjoy continuous improvements and exciting new features over time.
Acoustas AC650's Two Year Warranty
Acoustas AC650's Two Year Warranty
At Acoustas, we value each of our customers and are dedicated to offering the highest level of customer service. We will do our best to address each claim promptly and effectively, working directly with customers to resolve any issues to the best of our ability. We strive to provide personalized support and ensure a positive experience, making sure that our customers receive the best possible solution for their needs. (Link to Warranty Info)
30 Day No Hassle Return Policy
30 Day No Hassle Return Policy
Acoustas Return Policy – Hassle-Free & Customer-Focused
We want you to love your Acoustas purchase, but if it’s not the perfect fit, you have 30 days to return it—no questions asked. As long as your item is in its original condition, in its original packaging, and accompanied by proof of purchase, we’ll issue a full refund to your original payment method. If your product arrives damaged or defective, we’ll take care of it with a free exchange or refund. Just reach out to info@acoustas.com, and we’ll handle the rest! (Link to the Acoustas Return Policy )
Free Shipping
Free Shipping
Acoustas offers free standard shipping on the AC650 Amplifier to all 50 U.S. states, Canada, and all countries where we sell our products. Orders are typically processed within 1-3 business days, with delivery times of 2-3 business days within the U.S., 5-10 business days or faster in Canada depending on customs. If an order requires additional processing time, we will notify the customer via email. Customers are responsible for any applicable duties, taxes, or import fees on international orders. For any shipping inquiries, contact us at info@acoustas.com.
Acoustas AC650 - Deluxe Mini in White
The Acoustas AC650 in White combines elegant design with cutting-edge technology, offering a powerful DSP amplifier tailored for speaker builders. With a 10-channel speaker manager and 6 powered channels, it provides unmatched flexibility for managing crossovers, setting PEQs, live tuning, and A/B testing presets in real time via WiFi - allowing you to hear the results instantly.
Control is at your fingertips with compatibility across iPhone, iPad, macOS, Android, and Windows (coming soon) devices. Built with premium components, including Acoustas Cables, a CUI Inc. power supply, and a refined White finish, the AC650 ensures both durability and style.
The amplifier’s highly refined signal path, leveraging I2S technology, delivers the shortest possible route from source to signal processor to amplifier. This minimizes noise and maximizes audio fidelity, ensuring your sound is as clean and accurate as possible. Each feature — crossovers, equalizers, and more — has been rigorously tested, with comprehensive measurements and a technical report included to guarantee reliable performance.
Proudly designed and assembled in the USA, the AC650 comes with a 30-day, risk-free guarantee — if it’s not the perfect fit, simply return it in its original condition for a full refund. Our team in Richmond, Virginia, is always available to answer your questions and provide support.
The AC650 is a forward-thinking investment, with regular updates to our app ensuring continuous enhancements and new features, keeping your system at the cutting edge of audio technology.
Acoustas AC650's Two Year Warranty
Acoustas AC650's Two Year Warranty
At Acoustas, we value each of our customers and are dedicated to offering the highest level of customer service. We will do our best to address each claim promptly and effectively, working directly with customers to resolve any issues to the best of our ability. We strive to provide personalized support and ensure a positive experience, making sure that our customers receive the best possible solution for their needs. (Link to Warranty Info)
30 Day No Hassle Return Policy
30 Day No Hassle Return Policy
Acoustas Return Policy – Hassle-Free & Customer-Focused
We want you to love your Acoustas purchase, but if it’s not the perfect fit, you have 30 days to return it—no questions asked. As long as your item is in its original condition, in its original packaging, and accompanied by proof of purchase, we’ll issue a full refund to your original payment method. If your product arrives damaged or defective, we’ll take care of it with a free exchange or refund. Just reach out to info@acoustas.com, and we’ll handle the rest! (Link to the Acoustas Return Policy )
Free Shipping
Free Shipping
Acoustas offers free standard shipping on the AC650 Amplifier to all 50 U.S. states, Canada, and all countries where we sell our products. Orders are typically processed within 1-3 business days, with delivery times of 2-3 business days within the U.S., 5-10 business days or faster in Canada depending on customs. If an order requires additional processing time, we will notify the customer via email. Customers are responsible for any applicable duties, taxes, or import fees on international orders. For any shipping inquiries, contact us at info@acoustas.com.
Customer Reviews
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.
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.
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.
Example Speaker Build Video
In this video Stas builds open baffle monitors with four 8 inch woofers and two mids/tweeters using the AC650.
Tuning Speakers with AC650
In this video you can see how to quickly measure, crossover and DSP tune each driver with the Acoustas App.
1-6 Powered Amplifier - 50W/CH
Control each channel via App
- On/Off
- Invert
- Gain
- Time Delay
- Crossover
- 15-Band Equalizer
Optical Out-2CH 24Bit/192 kHz
Control each channel via App
- On/Off
- Invert
- Gain
- Time Delay
- Crossover
- 15-Band Equalizer
Analog Out 2-CH RCA
Control each channel via App
- On/Off
- Invert
- Gain
- Time Delay
- Crossover
- 15-Band Equalizer
Audio Inputs
- Bluetooth® AptX-HD
- USB Audio 24bit/192kHz
- Optical up to 24bit/192kHz
- Coaxial up to 24bit/192kHz
AC650 Specifications
- Bluetooth® AptX-HD
- USB Audio 24bit/192kHz
- Optical (S/PDIF) up to 24bit/192kHz
- Coaxial (S/PDIF) up to 24bit/192kHz
- 1-6 Powered Outputs (50W/CH)
- 7-8 Optical (S/PDIF) Outputs
- 9-10 RCA Outputs
Technical Specification
Download Full Technical Report (pdf)0.073505% @ 1kHz
62.68dB @ 1kHz
100dB @ 36 Watts into 4 Ohms
- 54 Watts into 4 Ohms
- 40 Watts into 8 Ohms
- 2 Channel up to 24-bit/192kHz Optical
- Up to 50-foot cable at 24-bit/96kHz
- 2 Channel Analog Outputs
- 112dB SNR 2.1V RMS
- Up to 50-foot RCA cable
- 24 V DC - 8.3A (CUI, Inc. for Deluxe Mini)
- 25.2V DC - 10A (Onyx)
9" x 7" x 2.6"
3 lb 11 oz
2.4 GHz
Control
Remote control the AC650:
- Main Volume
- Source Select
- Global Presets (all settings)
- Tone Control
- Left/Right/Center Gain
- More coming soon
Tune
Tune every aspect of the 10 channels:
- Select one or multiple channels to tune
- Turn On/Off, select Left, Right or Center
- Invert by 180 Degrees
- Gain Control, Time Delay
- Crossovers: Butterworth, Linkwitz-Riley, and Bessel 6-48dB/Octave
- FIR Crossovers (coming soon)
- 15-Band Equalizer with imports and exports
- A/B everything in Presets
Devices
- Add new devices via the WiFi network
- See all available devices in one place
- Power On/Off
- Quick Volume control
- Tap on any device to go into the Control Tab
Acoustas App
The Acoustas App connects via Wi-Fi to control and fine-tune both the overall sound and each individual channel. With its powerful Presets functionality, you can A/B test settings effortlessly, achieving fast, audible results. The app makes audio system tuning intuitive, rewarding, and — most importantly — 100% fun.
Scan to go to App store.
Scan to go to Play store.
Acoustas App on Mac App store.
100%
Designed and Assembled in USA
We design, assemble, and test each AC650 in Richmond, Virginia, USA. We stand by our quality and strive to provide the best possible acoustic experience and customer service.
FAQ
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How long will it take to get my orders?
It depends on where you are. Orders processed the same day and will be delivered 2-5 business days to arrive with in the lower 48 states. Delivery details will be provided in your confirmation email.
Any question?
You can contact us through our contact page! We will be happy to assist you.