Acoustas AC650 DSP Amplifier - Deluxe Edition in White
Now with a new FIR profile. Six powered channels. AirDSP control over Wi-Fi. Engineered to get the most out of your speakers.
Active Speaker Processor. Multichannel DSP amplifier.
The AC650 gives you everything you need to build high-quality active speakers and sound systems, controlled wirelessly over Wi-Fi® from any device.
With the AirDSP App you can address one or all channels at once. A 10-channel speaker manager and 6 powered channels let you manage crossovers, set PEQs, run live tuning, and A/B test presets in real time over Wi-Fi, hearing the difference as you go.
Speaker cable
Use 12 AWG multi-stranded cable without ferrules or 14 AWG cable with ferrules for the Phoenix connectors when wiring the amplifier to your speakers.
Speaker driver selection
Choose drivers that measure close to 4 Ω DC. They are preferred and more efficient, especially if your goal is to extract the most power from the AC650 powered channels, which perform best with 4-ohm loads. You can also wire two drivers in parallel for a 4-ohm load when appropriate.
For tweeters and most midrange drivers, 4-ohm or 8-ohm options both work well. Frequency response on and off axis matters more than impedance.
For less sensitive low-frequency or mid-bass drivers, choose 4-ohm versions for improved output and efficiency.
In the box
The AC650 White ships with the following components, while supplies last:
- Ultra-low-noise 200 W power supply by CUI Inc. (24 V DC, 8.3 A)
- Acoustas specialty USB-C audio cable
- Acoustas specialty optical audio cable
- 2 White Phoenix connector adaptors
- Black and White cable ferrules for 14 AWG cable
- 2 White 3 dBi antennas for Wi-Fi and Bluetooth®
Made in Richmond
New speaker builders get freedom to play with sound like never before. Audio enthusiasts transform existing speakers into active speakers.
Proudly designed and assembled in the USA, the AC650 is backed by a 30-day risk-free guarantee. Local support from our team in Richmond, Virginia, ready to answer any questions.
- Inputs
- Bluetooth® via AAC, AptX-HD and more
- USB Audio 24-bit / 192 kHz
- Optical (S/PDIF) up to 24-bit / 192 kHz
- Coaxial (S/PDIF) up to 24-bit / 192 kHz
- THD+N
0.073505% @ 1 kHz
- Signal-to-Noise Ratio
100 dB @ 36 W into 4 Ohms
- Amplification
- 54 W into 4 Ohms per channel
- 40 W into 8 Ohms per channel
- Optical Output
- 2 channels up to 24-bit / 192 kHz
- Up to 50-foot cable at 24-bit / 96 kHz
- RCA Output DAC
- 2 channels analog outputs
- 112 dB SNR · 2.1 V RMS
- Up to 50-foot RCA cable
- Power Supply
Onyx: 25.2 V DC · 10 A · 252 W
Deluxe edition / White: 24 V DC · 8.3 A · 200 W (CUI Inc., ultra-low-noise)
- DSP Profiles
FIR Profile · 24-bit / 48 kHz (recommended)
All AirDSP modules including FIR Builder and custom FIR capabilities.
Rich Profile · 24-bit / 96 kHz
All AirDSP modules, excluding FIR capabilities.
Pure Profile · 24-bit / 192 kHz
Core AirDSP modules at the highest sample rate.
- Max Channel Programming
Simultaneous programming of 1–10 channels over Wi-Fi
- Channel Invert
1–10 channels
- Channel Delay Time
0–50 ms
- IIR Crossovers
High Pass and Low Pass 20–20 kHz
Butterworth 6, 12, 18, 24, 30, 36, 42, 48 dB/Oct
Linkwitz-Riley 12, 24, 36, 48 dB/Oct
Bessel 6, 12, 18, 24, 30, 36, 42, 48 dB/Oct
- FIR
Engine: 1,500 taps per channel · 8 channels (6 powered + 2 RCA)
Crossover types: Linkwitz-Riley · Invisible · NTX-Pro · Linear-phase
Tools: Phase Linearizer · REW import/export · rePhase
- Presets
Stores: Full DSP state, now including FIR and Groups.
Switching: Near-instant between presets. Slightly longer when the preset includes FIR.
- 15-Band Equalizer
Live tuning of 1–10 channels
Frequency · Gain · Q · RTA mode
- Dimensions
9″ × 7″ × 2.6″
- Weight
3 lb 11 oz
- WiFi
2.4 GHz
What changes between editions.
Common questions
Is 50 W per channel enough for my build?
The AC650 is sized for active speaker builds, desktop and studio systems, and efficient drivers in normal listening rooms. For high-SPL builds or low-sensitivity woofers, use the RCA or optical line outputs to feed external amplification while keeping AirDSP control of the full chain.
Why is there no analog input?
The AC650 runs an end-to-end digital signal path. For turntables or analog preamps, run a phono preamp into a USB audio interface or optical converter, and the AC650 handles the rest.
Are Phoenix connectors a problem?
Phoenix connectors are compact, secure, and serviceable. They keep the rear panel clean while supporting multi-channel active builds. We recommend ferrules on cables up to 14 AWG, or bare wire up to 12 AWG directly into the terminal blocks.
Is this too advanced for me?
Use the AC650 like a normal amplifier on day one. When you're ready to tune, AirDSP opens crossovers, delay, parametric EQ, REW import, and FIR. Start at any depth, go deeper at your pace.
How reliable is the AirDSP app?
AirDSP ships on iOS, Android, macOS, and Windows. All four platforms get free updates. Support comes directly from the team in Richmond, Virginia.
What's the return policy?
30 days. If there are any issues whatsoever, the replacement is free. We'll work with you until you're fully satisfied.