The AC650 is an all-in-one 10-channel DSP, multi-way speaker manager, and amplifier, featuring 6x50W powered channels, 2 RCA outputs, and 2 Optical outputs. With the AC650, you can effortlessly build 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:
- WiFi control for fast and easy tuning of 2-way, 3-way, or more speaker systems, available anytime via WiFi through the Acoustas App
- Daisy-chaining multiple AC650 units via Optical S/PDIF at 24bit/192kHz for expanded channel capacity
- A/B testing of crossovers, equalizers, channel gain, channel inverting, time alignment, and more
The AC650 provides all the tools necessary to build and perfect high-performance speaker systems that truly amaze.
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 - 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 - Deluxe Mini in Snow White
The Acoustas AC650 in Snow 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 Snow 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.

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.
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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.