Down4Sound DSP / Processors

The Down4Sound AX5S | 5-Way Digital Powered Crossover is a car audio accessory. Designed to enhance your audio system installation and performance.

Description 0 Reviews Description The EZY-1216DSP+ provides complete command over your audio system with high-precision digital tuning and outstanding sound clarity. Built for professional installers and demanding enthusiasts, it delivers audiophile-grade performance, flexibility, and seamless mobile control in one robust unit. Key Features Inputs 12-Channel High-Level or Low-Level Input (High Level: 28 Vpp / Low Level: 12 Vpp) Integrated ULTRA HD Bluetooth 5.0 with aptX HD RCA, Optical, and Coaxial Inputs with built-in limiter Outputs 16-Channel Low-Level Output (12 Vpp) Premium Tiffany-Gold RCA Jacks Digital Signal Processing High-Performance 32-bit / 148 MHz DSP IC Precise 31-Band EQ with 25 ms Delay per Channel 96 kHz / 32-bit Sampling Rate All-Pass Filter Function Customizable Channel Naming and Adjustable Output Types Audio Performance Signal-to-Noise Ratio (RCA) > 100 dB Total Harmonic Distortion (THD + N) ≤ 0.05 % Noise Floor −95 dBu Intermodulation Distortion < 0.005 % Channel Separation > 95 dB Frequency Response: 20 Hz – 40 kHz Power & Environmental Operating Voltage: DC 9 – 16 V Working Current: 500 mA – 1 A Dark Current: < 3 mA Operating Temperature: −30 °C to +70 °C (−22 °F to 158 °F) Do not in an mount area that has heavy vibration. Mobile App Integration Real-Time RCA Output Voltage Display per Channel Tuning File Sharing and Backup Capability Windows Software EZY-DSP1216+ v1.2.7_Setup iPHONE Software: EZY 1216+ ON iOS View All Close 0 Reviews View All Close

Description 1 Review Description The DOWN4SOUND D4S-XP28 DSP is designed to give full control over your car audio system with powerful yet straightforward tuning tools. Built for professional installers and competition-level systems, the XP28 provides precise signal processing, reliable performance, and flexible configuration without unnecessary complexity. Featuring 2 inputs and 8 outputs , the XP28 allows clean control over multi-amplifier and multi-speaker systems. Each output channel can be tuned independently for accurate crossover setup, time alignment, phase adjustment, and system protection. The unit also includes an external Bluetooth antenna mounted on the top of the processor for reliable wireless connectivity when configuring the DSP. Key Features 2 input / 8 output digital signal processor External Bluetooth antenna mounted on top of the unit Tiffany style RCA connectors for secure signal connections Durable Down4Sound chassis with integrated display Independent gain and mute control per output channel Master volume control Save and load custom tuning profiles Password protection to prevent unauthorized changes Built-in screen saver with rotating text Tuning and Signal Control 15-band graphic equalizer on input channels Parametric EQ on inputs and outputs Butterworth and Linkwitz-Riley crossover filters Crossover slopes up to 48 dB per octave Flexible routing between inputs and outputs Time Alignment and Phase Control Full delay control for speaker placement correction Phase adjustment and phase inversion Precise timing alignment for multi-speaker systems Limiter and System Protection Adjustable limiter with threshold control Dynamic attack and release settings Protects speakers and amplifiers from signal overload Key Specifications 2 RCA inputs 8 RCA outputs Independent gain control per output Master volume control Frequency response: 10 Hz – 22 kHz Total harmonic distortion: <0.01% Signal-to-noise ratio: >90 dB Input impedance: 10 kΩ Output impedance: 47 Ω Maximum input voltage: 5.6 Vpp (+8.2 dBu) Maximum output voltage: 5.6 Vpp (+8.2 dBu) Dimensions 180 mm × 120 mm × 40 mm 7.08 in × 4.72 in × 1.57 in Ideal Applications Competition-level car audio systems Multi-amplifier installs requiring precise DSP tuning Active front stage systems Subwoofer and full-range system alignment Professional car audio installations View All Close 1 Review 4 Cool Unit Good Features Posted by James Drummond on Oct 29, 2025 This thing works awesome for what it is. Love the features like physical channel muting for tuning purposes. Gave it 4 stars because I wish it would remember channel muting and also an app like EZY would be awesome! Even if I could download and upload other people profiles that would be cool View All Close

Description Videos 5 Reviews Description Take Your Audio System to the Next Level The EZY DSP612+ delivers advanced tuning, high-definition streaming, and seamless integration into any car audio system. Whether you’re upgrading a factory setup or building a custom system, this DSP provides the ultimate combination of control, flexibility, and precision. Unmatched Flexibility, Standard in Every Unit High-Level Inputs: Designed for factory systems where replacing the radio isn’t an option. Effortlessly converts high-level signals into clean digital audio , upgrading your factory system with ease. Retain all OEM features while unlocking premium sound quality. Low-Level RCA Inputs: Ideal for custom setups with aftermarket radios. Delivers a direct, clean signal path to your amplifiers for maximum clarity and performance. Bluetooth Streaming with APTX-HD: Stream your music in TRUE high-definition directly from your phone or other Bluetooth devices. Built-in APTX-HD Bluetooth technology provides studio-quality wireless audio for a seamless listening experience. Forget traditional head units—your smartphone becomes the ultimate control hub for your audio system. Key Features Every feature is included as standard to provide maximum flexibility and value: Inputs: 6 RCA inputs (high-level or low-level) for seamless integration with any system. Outputs: 12 RCA outputs with 4.2Vrms output voltage for precise audio distribution to amplifiers. Bluetooth Streaming: Built-in Bluetooth 5.0 with APTX-HD for TRUE HD wireless streaming. Connectivity Options: Optical and coaxial inputs for flexible connection to modern audio sources. Advanced Audio Processing: 31-band EQ for precise frequency, Q-value, and gain control. High/low-pass filters with adjustable slopes for professional tuning. Phase adjustment (0° to 360°). Delay control up to 20ms (273 inches) for accurate speaker timing. Custom Presets: Save and instantly recall up to 6 audio profiles for different setups. Noise Control: Features a noise gate, limiter, and minimum source attenuation for crystal-clear audio. eZy-Controller 1 is sold seperately EZY DSP App Now Available Take complete control of your sound system with the EZY DSP App , now available on: Apple iOS App Store Google Play Store WINDOWS PC SOFTWARE - REQUIRES USB CONNECTION Specifications Specification Value Dynamic Range ≥100dB Signal-to-Noise Ratio ≥102dB Total Harmonic Distortion ≤0.05% Frequency Response 20Hz ~ 20kHz Sampling Rate 48kHz/24Bit RCA Input Voltage (RMS) 2.8Vrms RCA Output Voltage (RMS) 4.2Vrms RCA Input Impedance 10kΩ RCA Output Impedance 51Ω Max Input/Output Signal 12Vpp Working Voltage DC 9V ~ 16V Operating Temperature -30°C to 70°C (-22°F to 158°F) Dimensions 6 in x 5 in x 3 in Weight 2 lbs Why Choose the EZY DSP612+? Ultimate Flexibility: High-level and low-level inputs make it compatible with both factory and aftermarket systems. True HD Bluetooth Audio: Stream directly from your phone with APTX-HD Bluetooth 5.0 for studio-level sound quality. Crystal-Clear Audio: Dynamic range of ≥100dB and distortion ≤0.05% ensures every detail of your music is heard. Comprehensive Tuning Options: Advanced features like a 31-band EQ, phase adjustment, and delay control let you fine-tune your system to perfecti Order Yours Today! Whether you’re upgrading a factory system, building a custom setup, or streaming directly from your phone, the EZY DSP612+ gives you unmatched control, flexibility, and sound quality. Experience the Down4Sound difference today! View All Close Videos Down4Sound EZY DSP software walkthrough Please use the link at D4S website: https://lddy.no/1k57z Use ... THE DOWN4SOUND EZY-DSP IS A MUST HAVE!!!! RAW-CAt DOWN4SOUND EZY-DSP 612 REVIEW - NEW BUDGET KING OF DSP... View All Close 5 Reviews 5 EZY-DSP612 Posted by Russell Carson on Mar 20, 2026 Absolutely brought my system to another level, sound quality, and SPL raised so much 4 Almost Perfect Posted by C.M. on Nov 09, 2025 It is a fantastic device for beginners who want to get into tuning. I really hope they will come out with firmware/software that will allow the importing of parameters directly from REW, an option that more premium DSPs offer. Considering this processor is a fraction of the price, it's hard to beat. Once they integrate PC-Tool, I would be comfortable paying $800. 4 Great DSP. Posted by Raymond Petty on Oct 31, 2025 This DSP is great and user friendly. I would give it 5 stars if you could copy and paste the frequencies and Q parameters in like the Helix. 5 Best you can get for the price Posted by ScottyP on Aug 05, 2025 I just finished installing the D4S EZY DSP612+ in my setup, paired with the EZYPWR 810, and I’m seriously impressed. The tuning process was smoother than I expected—the software is user-friendly, and once I started dialing it in, the difference was instantly noticeable. Imaging and staging locked in, and I finally felt like I had full control over how my system sounds. It took some time to get everything dialed in exactly how I wanted, but once it was set, it completely transformed the listening experience. What really impressed me is how clean and transparent the signal is. There’s no added noise, just clean output going straight to the amp. The EZYPWR 810 is powering my Hertz components and four 6.5" CT Sounds Meso subs, and the combo absolutely slaps. The DSP brought everything to life—the subs hit tight and low, and the mids and highs are crisp without being harsh. For what this DSP costs and how much control it gives you, it's definitely one of the most underrated pieces of gear I’ve added to my system. 5 EZY DSP 612 Posted by Sean Macey on Feb 23, 2025 I am very happy with this product. I really like how I can just use it with any BT device. No head unit required. I am probably going to get at least 1-2 more for other vehicles and my garage. As long as it lasts for years I will give it a top rating. Mine has been ruuning since Jan 2025. View All Close

Description Videos 7 Reviews Description The EZY DSP68+ is your ultimate car audio solution, offering the Down4Sound difference with unmatched flexibility and performance. Whether you're upgrading a factory system or creating a custom setup, the EZY DSP68+ has you covered. With both high-level and low-level input capabilities , it adapts to your needs, making every feature standard and ensuring you get the best audio experience. Want to keep it simple? Use your phone as the source with its built-in Bluetooth 5.0 for TRUE HD audio streaming —no head unit required. Unmatched Flexibility, Standard in Every Unit High-Level Inputs: Perfect for factory systems where replacing the radio isn’t an option. Converts high-level signals into clean, professional-quality digital audio. Retain all OEM features while upgrading your sound to the next level. Low-Level RCA Inputs: Designed for custom setups with aftermarket radios. Direct, pure signal path for audiophiles who demand crystal-clear audio. Provides high signal quality to maximize system performance. Bluetooth Streaming: Use your smartphone as the source unit with built-in Bluetooth 5.0 . Stream music in TRUE HD AUDIO directly to the DSP. No head unit? No problem—your phone becomes the control center of your system. Key Features Every feature is standard, designed to give you the best possible experience: Inputs: 6 RCA inputs (high-level or low-level) for seamless integration into any system. Includes a harness for quick and easy installation. Outputs: 8 RCA outputs with 4.2Vrms for clean, powerful sound distribution to your amplifiers. Bluetooth Streaming: Built-in Bluetooth 5.0 for TRUE HD wireless audio streaming. Connectivity Options: Optical and coaxial inputs for flexible connection to modern audio sources. Advanced Audio Processing: 31-band EQ for precision frequency, Q-value, and gain control. High/low-pass filters with adjustable slopes for detailed tuning. Phase adjustment (0° to 360°) to align your sound perfectly. Delay control up to 20ms (273 inches) for accurate speaker timing. Custom Presets: Save and recall up to 6 audio profiles for quick customization. Noise Control: Features a noise gate, limiter, and minimum source attenuation for clean, undistorted sound. eZy-Controller 1 is sold seperately EZY DSP App Now Available Take complete control of your sound system with the EZY DSP App , now available on: Apple iOS App Store Google Play Store Download the app and customize your audio settings directly from your favorite device to achieve the ultimate listening experience. Windows Software EZY-DSP68+ 2025-1-6 Specifications Specification Value Dynamic Range ≥100dB Signal-to-Noise Ratio ≥102dB Total Harmonic Distortion ≤0.05% Frequency Response 20Hz ~ 20kHz Sampling Rate 48kHz/24Bit RCA Input Voltage (RMS) 2.8Vrms RCA Output Voltage (RMS) 4.2Vrms RCA Input Impedance 10kΩ RCA Output Impedance 51Ω Max Input/Output Signal 12Vpp Working Voltage DC 9V ~ 16V Operating Temperature -30°C to 70°C (-22°F to 158°F) Dimensions 5 in x 3 in x 3 in Weight 2 lbs Why Choose the EZY DSP68+? Flexible Integration: High-level and low-level inputs make it compatible with factory and aftermarket systems alike. Crystal-Clear Audio: Dynamic range of ≥100dB and ultra-low distortion (≤0.05%) ensure every detail of your music is heard. Wireless Streaming Excellence: Use your phone as the source with Bluetooth 5.0 , delivering TRUE HD sound directly to your system. Custom Control: Advanced tuning features like the 31-band EQ, phase alignment, and delay adjustment let you dial in the perfect sound.\ Download the app and customize your sound settings directly from your favorite device, giving you the power to create your perfect car audio experience. View All Close Videos Down4Sound EZY DSP software walkthrough Please use the link at D4S website: https://lddy.no/1k57z Use ... View All Close 7 Reviews 5 DOWN4SOUND EZY DSP68+ Posted by Anthony on Mar 09, 2026 If you’re running a stock head unit, and you want the most out of your aftermarket speakers this is a must have, day and night difference and easy to install 5 D4S DSP for the win!!!!!! Posted by Fred on Mar 01, 2026 Spoke with the owner of the shop that I have been using since the late 90's & he recommended this DSP for my new build that he will be doing in a few weeks (traveling for work the new two weeks so I have to wait) & he's been telling me for two years to switch over to D4S amps so that will also be happing soon. Heck he is authorized dealer for D4S and he told me to order direct since they are having a sale. 5 Excelente de lo mejor y bma buen precio Posted by Carlos Barroso on Dec 08, 2025 Excelentes productos son de lo mejor muy buena calidad les recomiendo todo de la marca D4S 5 I love it very much Posted by Kelvin Fitz on Nov 22, 2025 U was the best 5 DSP Posted by Unknown on Nov 11, 2025 Outstanding and it looks like the rest of my amps.. I wish it was gloss white to match. 5 Best purchase Posted by DeAngelo on Jun 26, 2025 This has been the best car audio purchase I have ever purchased. After having my prior system stolen, an my factory radio shorted out. This allowed me to have music in my car again with out having to pay Lexus $8k to replace my radio. The Bluetooth function was exactly what I was looking for in a dsp. 4 DSP68+ Posted by Jacob L. on Apr 22, 2025 I am going from the DSP68 to the DSP68+ and everything seems to work the same except that I can't seem to get my android app to connect to it. The only reason I did upgrade was so I could get rid of my LOC. View All Close

Description Videos 6 Reviews Description Take full control of your DSP settings with the EZY CTRL1 Wired DSP Controller . Designed for precision tuning, this compact controller allows you to make real-time adjustments to volume, bass, and sound presets with ease. Featuring a 1.3-inch OLED screen , this controller provides a clear display of your settings while maintaining a sleek, professional appearance. Key Features 1.3-inch OLED Display: Bright and clear interface for easy adjustments. Total Volume Adjustment: Fine-tune the master volume of your system. Ultra-Bass Control: Adjust bass levels for enhanced low-end performance. One-Button Mute Function: Instantly mute the audio output with a single press. Sound Source Switching: Easily toggle between different input sources. Preset Sound Calls: Save and recall your DSP preset sound settings. Rotary Knob Interface: Simple and intuitive navigation. RJ11 Connection: Quick and secure plug-in connection to your DSP unit. Operating Instructions Startup Interface – When powered, the controller automatically initializes and displays the dynamic DSP Audio screen. Main Interface – Rotate the knob to adjust volume; long press to return to the main menu. Sound Source Selection – Press the knob to access input sources and select the desired mode. Ultra-Bass Adjustment – Short press the knob to access Super Bass Mode , with volume adjustments ranging from 0-60. Preset Sound Selection – Quickly switch between saved DSP presets by pressing the knob. Technical Specifications Display: 1.3-inch OLED screen Control Interface: Rotary knob + push-button selection Connection Type: RJ11 Adjustment Range: 0-60 (volume & bass) Mounting Compatibility: Universal dashboard or under-dash mounting Compatibility The EZY CTRL1 is designed to integrate seamlessly with EZY DSP units and other compatible processors utilizing an RJ11 interface . Note: This controller is wired and does not support Bluetooth connectivity. Why Choose EZY CTRL1? ✔ Real-time DSP Adjustments – Tune your audio on the fly. ✔ Compact & Durable Design – Built for seamless integration into any vehicle. ✔ Intuitive User Interface – Easy-to-use rotary knob and button system. ✔ High-Quality Display – OLED screen for better visibility in all lighting conditions. Upgrade your system control with the EZY CTRL1 and experience precision tuning at your fingertips! EZY CONTROLLER MANUAL View All Close Videos THE POWER IS IN YOUR HANDS WITH THE EZY CONTROLLER FROM DOWN4SOUND!!! Take full control of your DSP settings with the EZY CTRL1 Wire... View All Close 6 Reviews 5 DSP CONTROLLER Posted by Unknown on Nov 11, 2025 Works and looks great! 4 Seems like decent quality Posted by Micheal Bradley on Sep 02, 2025 Great little controller—simple, responsive, and works exactly as it should. My only complaint is that it’s handheld only; I wish it could be mounted for easier in-car use. Still a solid product overall. 5 Ezy DSP controller Posted by Jamie Hinesley on Jul 26, 2025 Works as intended. Just wish it was cordless, but works well. 5 Review for DOWN4SOUND EZY-Controller 1 Posted by Ruel on Mar 27, 2025 The DOWN4SOUND EZY-Controller 1 is a game-changer for managing and fine-tuning your car audio system. It’s easy to install, user-friendly, and adds a whole new level of control to your sound setup. ✅ Features & Performance: Precision Control: Allows fine-tuning of volume, bass levels, and other audio settings with real-time adjustments. Perfect for those who love customizing their sound on the go. Smooth Operation: The dials and buttons feel solid and responsive, giving you smooth, precise control without lag. Versatile Compatibility: Works seamlessly with Down4Sound amplifiers and other popular brands, making it a versatile addition to any system. ? Ease of Use & Installation: Plug-and-Play Setup: Installation is simple with clear instructions—no advanced wiring skills required. Ergonomic Design: Compact and dash-friendly design makes it easy to mount and access while driving. ? Build Quality: Durable Construction: Feels sturdy and built to last, with high-quality materials that hold up under daily use. Sleek Look: Clean, modern aesthetic that blends well with your car’s interior. ? Overall Verdict: If you want more control over your sound system without the hassle, the DOWN4SOUND EZY-Controller 1 is a must-have. It’s a reliable, easy-to-use tool for enhancing your in-car audio experience. Highly recommended for audio enthusiasts – 10/10! 5 Down4sound EZY Controller Posted by Sean Macey on Mar 17, 2025 Jessica Medina is still the best! I have been using this controller for a few weeks now. It is nice for streaming directly to the dsp. I also have my presets arranged so I can isolate my subs mids and highs for testing w/o the laptop. As I have said in my other reviews, I will most likely be buying 1 or 2 more EZY Dsps and a contoller for each 1. Good stuff. 5 Down4sound EZY Controller Posted by Sean Macey on Feb 23, 2025 Jessica Medina is the best! This controller is really good too. Just got mine, it does what I wanted. I can control my BT volume nicely without a head unit and It allows me to use my presets more effectively. Looks good too. View All Close

Description 2 Reviews Description Take full command of your car audio system with the Down4Sound XPS610 DSP Processor . Designed for enthusiasts who want power and flexibility, the XPS610 gives you 6 switchable RCA/High-Level inputs and 10 RCA outputs , letting you build and fine-tune the system you’ve always wanted. With Bluetooth 5.0 wireless control , adjustments are smooth, stable, and easy to make directly from your smartphone. The built-in DSP delivers 31-band graphic EQ, parametric EQ, crossovers, delay, and phase alignment , giving you the tools to dial in professional-grade sound. Compact, installer-friendly, and packed with tuning features, the XPS610 is the perfect balance of everyday reliability and advanced audio processing . Key Features: 6 RCA / High-Level Inputs (switchable) 10 RCA Outputs for flexible system building Bluetooth 5.0 wireless tuning Bluetooth Wireless Streaming 31-band EQ + PEQ with up to 90ms delay 96kHz / 32-bit DSP processing Frequency Response: 20Hz–20kHz Signal-to-Noise Ratio: ≥108dB THD+N: ≤0.01% Compact build: 142 × 89 × 38 mm (5.59" × 3.50" × 1.50") Tiffany RCA connectorss IOS app Andriod apk View All Close 2 Reviews 5 XPS 610 DSP Posted by Orlando V on Mar 16, 2026 10/10 great beginner Dsp 4 Nice Unit... Posted by Allen M. on Sep 09, 2025 Installation and implementation of this processor couldn't be easier. It looks good and has great form factor. Sound is relatively clean. My only gripe is that there is some bleed in the crossover frequencies. My guess is that the crossovers are not true to spec. I'm using Butterworth 24db/oct on my midwoofer channels and still get a good bit of higher register female vocals coming through them. Hopefully, D4S will address this with updates to the firmware or hardware soon. Other than that, this might be one of the best deals out there. View All Close

The Down4Sound DSP612 is a quality car audio product from Down4Sound.

The Down4Sound DSP68 is a quality car audio product from Down4Sound.

The Down4Sound ESY DSP612+ | 6-In-12 Out Digital Signal Processor is a quality car audio product from Down4Sound.

The Down4Sound EZY DSP612+ All-in-One Hi/Low Level Car DSP 6-in-12 Out is a quality car audio product from Down4Sound.

The Down4Sound EZY DSP68+ All-in-One Hi/Low Level DSP 6-in-8 Out is a quality car audio product from Down4Sound.

The Down4Sound D4S-XP28 DSP is engineered for those who want total control over their system. Designed with installers and competitors in mind, the XP28 gives you 2 inputs and 8 outputs, paired with precision tuning tools that go far beyond basic processors. With a graphic and parametric EQ, limiter with threshold/attack/release, high-precision Butterworth & Linkwitz-Riley crossovers, and full delay/phase control, this DSP is built for competition-level accuracy. It even includes test tools like a frequency generator, sweep, and pink noise for professional system setup. Key Features: 2 RCA inputs / 8 RCA outputs Graphic input EQ (15 bands) + parametric EQ (per input & per output) High precision crossover: Butterworth & Linkwitz-Riley (up to 48 dB/octave) Phase inversion, alignment, delay control Limiter with threshold, attack, release adjustment Independent gain & mute per output + master volume Save & load custom tuning profiles Security password to block unauthorized changes Frequency generator, sweep, and pink noise for setup Screen saver with rotating text Tiffany RCA connectors, D4S case finish Dimensions: (est.) ~180 &times; 120 &times; 40 mm (7.08" &times; 4.72" &times; 1.57")