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Helix DSP Software Setup, Part 1: Initial Setup and Inputs
Helix DSP Software Setup, Part 1: Initial Setup and Inputs
Tech Tip: Helix DSP Software Setup, Pt.1: Initial Setup & Inputs/Outputs This is going to be our first post going over your Audiotec Fischer Helix, Brax, or Match DSP product. For this first video, we are focusing on the initial Helix DSP software setup and configuring the inputs and outputs. Please note that the software used is the V5.00.05, so some things may change as they update the software, which they regularly do.  Inputs and Output Menu: This will the first menu you have to set up in your Audiotec Fischer Helix, Brax, or Match DSP. It is also one of the most confusing for new users. In this video we go over how to use it, its capabilities, and...
How To Use WinISD To Model, Simulate, & Compare Loudspeakers
How To Use WinISD To Model, Simulate, & Compare Loudspeakers
Tech Tip: How To Use Winisd To Model, Simulate, & Compare Loudspeakers What Is Speaker Modeling Software? What is WinISD?         WinISD is a free software program designed for speaker design and optimization. The software allows users to create and simulate different speaker and subwoofer enclosure designs, and analyze their acoustic performance.        WinISD provides a variety of tools and features to help users create optimized speaker designs. For example, users can input the parameters of their chosen driver, such as the Thiele-Small parameters, and the software will calculate the optimal box size and port tuning frequency based on the selected design.        The software also includes graphical analysis tools, which allow users to...
Sound Deadening Testing – How It All Works, Layers, Weight, & Coverage Comparisons
Sound Deadening Testing – How It All Works, Layers, Weight, & Coverage Comparisons
Not all sound deadeners are equal. This article explains how coverage and weight can’t match the efficiency of a properly engineered product, backed by independent testing that compares ResoNix against budget alternatives.
2022 Volvo S60 Sound System Upgrade & Sound Deadening Installation
2022 Volvo S60 Sound System Upgrade & Sound Deadening Installation
A nearly invisible, OEM looking Volvo S60 system build. Helix P Six Ultimate and P One Mk2, Audiomobile Encore 12s in compact sealed chambers, and full ResoNix treatment in doors, rear deck, and trim. Digital signal via MOST150, tidy wiring, quick-disconnect serviceability, and a clean, removable trunk display.
2023 Ford Bronco – Sound Deadening & Noise Reduction Installation
2023 Ford Bronco – Sound Deadening & Noise Reduction Installation
The Ford Bronco suffers badly from wind, road, and tire noise. Our ResoNix Ford Bronco Sound Deadening Kit fixes this by treating doors, floor, quarter panels, wheel wells, and hood with CLD, absorbers, and barriers. The result is a quieter cabin and a more refined driving experience without sacrificing off-road performance.
Porsche 911 GT3 – Sound Deadening For Maximum Noise Reduction & Minimum Weight Added
Porsche 911 GT3 – Sound Deadening For Maximum Noise Reduction & Minimum Weight Added
Discover how the ResoNix Porsche 911 Sound Deadening Kit transforms the driving experience by reducing rattles, tire noise, and exhaust drone without sacrificing the signature 911 character. This detailed installation log showcases the materials, methods, and results that bring clarity, comfort, and refinement to one of the world’s most iconic sports cars.
How To: Sound Deadening Car Doors The Right Way
How To: Sound Deadening Car Doors The Right Way
Properly sound deadening your car doors is one of the most important steps you can take to improve both your vehicle’s audio system and overall driving comfort. When done right, it eliminates panel resonance, cuts down on road and wind noise, and provides a solid foundation for your speakers to perform as intended. In this guide, we break down exactly how to do it the right way, including which materials to use, how to prepare and treat each surface, and common mistakes to avoid that can waste time and money. Whether you are looking for cleaner bass, better midrange clarity, or simply a quieter cabin, this step-by-step process ensures you get results that last.
someone sound deadening a automobile door with text describing an article that teaches you how to do it yourself
Sound Deadening Reference Information Guide
This guide breaks down the four types of sound deadening materials: vibration dampers, decouplers, sound absorbers, and noise barriers. It explains what each one does, how it works, and when to use it. Whether you're quieting road noise or improving a high end car audio system, this article helps you make the right choices.
Nick Apicella of ResoNix tuning a car audio sound system DSP
DSP Tuning Tracks & Guide
This guide shares my car audio specific DSP tuning tracks playlist along with a streamlined tuning walk through, designed to help polish your DSP adjustments by combining measurement tools and listening. It is not a full tuning manual, so having a basic foundation in DSP tuning is recommended.
Car door covered in automotive sound deadening material with text describing what to use.
ResoNix Sound Deadening Materials Buyer's Guide
Not sure how much sound treatment you need or which ResoNix products to use? This buyers guide explains which areas of your vehicle are most important to treat and offers kit suggestions from Stage 1 to Stage 5. Learn how much CLD, foam, absorber, or barrier to use based on your goals, budget, and experience.
How To Measure Phase Cohesion Through A Crossover Using Room EQ Wizard RTA, A Microphone, & All Pass Filters
How To Measure Phase Cohesion Through A Crossover Using Room EQ Wizard RTA, A Microphone, & All Pass Filters
How To Measure & Verify Phase Cohesion Through A Crossover Using An RTA Hey everyone, I'm starting a blog to share various tech tips and useful information. For my first post, I decided to make an old video of mine available again. In this video, I demonstrate how to measure phase quickly and easily verify phase for maximum cohesion through a crossover. This is done using nothing but an RTA, All Pass Filters, and the Phase Slider on my Helix DSP. Additionally, I measure the results with Room EQ Wizard and a USB Measurement Microphone. Although I used a Helix DSP for this demonstration, it's an older video, so some things may look a bit different. Furthermore, the video includes my old company's...

Your questions answered.

Every vehicle and goal set is different. Start with our sound deadening buyer’s guide to understand what each material does and where to use it. If you want a tailored plan, book our sound system design and installation consultation.


To help offset the cost, up to 40% of the consultation fee can be credited toward ResoNix product purchases made within 30 days.

Most people ask this because they are not sure what physically fits. Fitment varies by vehicle, trim, and where you plan to install it. Check available depth carefully and avoid interfering with moving parts, window tracks, airbags, and service access. As a general rule, choose the thickest that comfortably fits the space. See the product page for details.

We are building an ongoing fitment sheet from customer confirmations. If you can share what fit in your vehicle, please let us know to help others.

If an item is on backorder, the estimated restock date appears on its product page and is updated as we get new information.

Domestic orders that include a backordered item will ship in two parts: in‑stock items ship immediately, and the backordered items ship as soon as they arrive. For international orders, we currently ship when all items are in stock.

You will receive an order confirmation by email, then a tracking email once your order ships. If you need an update or anything looks off contact us with your order number.

We recommend high‑quality, proven DSPs matched to your system design and goals. If you want a custom recommendation, book our sound system design and installation consultation.

To help offset the cost, up to 40% of the consultation fee can be credited toward ResoNix product purchases made within 30 days.

Yes. Start with the sound deadening buyer’s guide for material selection and placement, and the sound deadening reference information & guide for deeper technical detail and best practices.

Please open every box and wrapper fully, since small items are sometimes packed inside larger kits for protection. If something still appears missing, reach out with your order number and what you are not seeing.
We will make it right. Contact us.

Yes, we ship worldwide. Available carrier options and rates are shown at checkout based on destination and weight. Transit times depend on the service you choose and customs processing. Express options are typically faster, while economy services take longer.

Full details are here: Returns and refunds policy.

If you need to cancel an order before it ships, contact us as soon as possible. If a return is needed, follow the instructions on that page so we can process it quickly.

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Need further guidance or have questions? See below for more ways to get in contact and view resources.