Audio Intensity is run by Scott Welch, who has been working in car audio since 1985 and holds multiple National and World Championship titles in Sound Quality competition through IASCA and MECA. Every product recommendation and enclosure design comes from decades of hands-on competition and installation experience, not marketing specs.

We manufacture our own Proline X subwoofer enclosures in-house using ShopSabre CNC routers and Langboard Elite 3/4" MDF, and we are the Original US Importer of Goldhorn DSP. That combination of in-house manufacturing and direct import relationships is not something you will find at most car audio retailers.

Audio Intensity was founded in December 2014 in Northern California. Scott Welch's background in car audio stretches back to 1985, when he began as an apprentice installer straight out of high school. The business relocated to Tullahoma, Tennessee in January 2026.

Our Tullahoma, Tennessee shop is open by appointment only, so please call or text to schedule a visit. All Proline X enclosures are built to order at that facility, and online orders ship nationwide. Our address is 122 Turkey Creek Church Rd, Tullahoma, TN 37388. Note that our customer service number (931-563-5151) is a California number carried over from our original location.

Scott Welch earned multiple National and World Championship titles in Sound Quality competition through IASCA and MECA between 2012 and 2019. Since 2019 he has served as an active SQ competition judge at local, regional, and finals-level events. The standards applied to every product we carry and every enclosure we build are the same standards used to evaluate the best systems in the country.

We carry a curated lineup selected for sound quality performance:

• Audiomobile, subwoofers
• Crescendo, subwoofers and amplifiers
• Image Dynamics, subwoofers and amplifiers
• JL Audio, subwoofers
• Karma Mobile Audio, speakers and front stage components
• Prodigy Audio, subwoofers and amplifiers
• Wavtech, subwoofers and amplifiers
• Arc Audio, amplifiers and processors
• US Acoustics, amplifiers
• Tru Technology, amplifiers
• Audio Wave, amplifiers, exclusive US distributor
• Goldhorn DSP, digital signal processors, Original US Importer
• Proline X, custom subwoofer enclosures manufactured in-house

We focus on brands that offer genuine performance advantages for sound quality builds, particularly brands with direct import relationships that eliminate middleman markups. The brands we carry are selected based on real-world competition testing, not retail distribution margins. If a product does not hold up under the same scrutiny we apply on a competition vehicle, it does not go in the catalog.

Proline X is Audio Intensity's proprietary brand of custom subwoofer enclosures, manufactured in-house in Tullahoma, Tennessee. Every enclosure is CNC-cut on ShopSabre routers using Langboard Elite 3/4" MDF, built to order, and spec-matched to the driver it houses.

Current series include Performance, Professional, X Series, Micro Series (shallow-mount sealed), Vehicle Specific, and Loaded. All sealed enclosures ship with polyfill pre-installed. Lead time is 2 to 4 business days.

Proline X enclosures carry either a 1 year or a 2 year warranty on craftsmanship and materials, depending on the series. The more advanced series carry the 2 year coverage. In both cases the warranty covers defects in construction or finish. Check the product page for the specific enclosure you are looking at, since coverage is listed per series.

Sealed enclosures deliver tight, controlled, accurate bass and are compact, which makes them well suited for sound quality builds and mixed-genre listening. They require more amplifier power to achieve the same output level as ported.

Ported enclosures are tuned to a specific frequency and deliver higher efficiency and deeper extension in a larger cabinet. They are the preferred alignment when EBP (Efficiency Bandwidth Product) analysis supports it, generally when a driver's EBP falls between 80 and 90 or higher.

• 8 inch, compact vehicles and tight spaces, accurate bass in smaller cabins
• 10 inch, versatile choice for most installs, good balance of output and space efficiency
• 12 inch, enthusiast choice for deeper extension and higher output in mid-size and larger vehicles
• 15 inch, maximum output for trucks, large SUVs, and competition systems with adequate space

Our Vehicle Specific Series covers a growing list of makes and models with enclosures engineered for exact fitment. For vehicles not currently in the lineup, contact us to discuss a custom build. Lead time is 2 to 4 business days for standard series enclosures.

Goldhorn is a precision DSP (Digital Signal Processor) brand designed for serious sound quality builds. Audio Intensity is the Original US Importer. Current lineup includes the DSPA 406 (4 input / 6 output), DSPA 810 Pro (8 input / 10 output), and DSPA 1216 Plus (12 input / 16 output with integrated amplification).

Goldhorn units support factory system integration without head unit replacement, WiFi and Bluetooth connectivity, advanced tuning software, and high-resolution audio processing. They are carried because they perform at a level that justifies recommending them in serious SQ builds, not because of a distribution arrangement.

Goldhorn products carry a 1-year limited warranty covering defects in materials and workmanship under normal use conditions.

Audio Wave warranty coverage varies by series. Excel and Active series carry a 2-year warranty, Aspire series carries a 3-year warranty, and CR series carries a 5-year warranty.

For any build where sound quality is the goal, yes. Vehicle cabins create acoustic problems including reflections, standing waves, and uneven frequency response that cannot be corrected by amplifier gain adjustments alone. A DSP handles time alignment, crossover control, and equalization with precision that transforms how a system performs in-vehicle.

It is especially valuable when integrating with a factory amplified system, running a multi-amplifier setup, or trying to achieve accurate stereo imaging.

Match amplifier RMS output to 100 to 150% of the subwoofer's RMS power handling. This gives you clean headroom without risk of underpowering or clipping. Also verify impedance compatibility. The amplifier's rated output impedance must match the load presented by the subwoofer wiring configuration.

Class AB is the most common topology for full-range amplification and offers a good balance of sound quality and efficiency. Class D uses switching output stages for very high efficiency and compact size, making it the standard choice for subwoofer amplification. Class A operates with the output transistors always on, giving the highest linearity and the lowest efficiency, and is rarely used in car audio.

Monoblock amplifiers are single-channel designs optimized for subwoofer duty, with high current output, strong low-frequency response, and typically Class D topology. Multi-channel amplifiers power two or more speakers from a single unit and are used for full-range speaker systems. The standard approach for a complete system is a multi-channel amplifier for the main speakers paired with a dedicated monoblock for the subwoofer.

RMS (Root Mean Square) is the continuous power rating, the amount of power a speaker or subwoofer can handle on an ongoing basis without damage. It is the specification that matters for amplifier matching. Peak power ratings are not useful for system design.

Impedance (measured in ohms) is the load a speaker presents to an amplifier. Common ratings are 2, 4, and 8 ohms. Lower impedance draws more current and produces more power from the same amplifier, but requires an amplifier rated for that load. Always verify your amplifier is stable at the impedance your wiring configuration presents.

Crossover frequency is the point at which the audio signal is divided between different drivers. A subwoofer crossover set at 80 Hz means the subwoofer handles everything below 80 Hz while the main speakers handle everything above it. Setting this correctly is critical for seamless integration and accurate imaging.

EBP (Efficiency Bandwidth Product) is calculated by dividing a driver's resonant frequency (Fs) by its Q at electrical termination (Qes). An EBP between 80 and 90 indicates the driver works well in either sealed or ported alignments. Above 90 generally favors ported. Below 50 generally favors sealed. EBP analysis is part of every Proline X enclosure recommendation, and you can run the numbers yourself on our EBP Calculator.

Standard ground, expedited, and overnight shipping are available at checkout. Proline X enclosures are built to order with a 2 to 4 business day lead time before shipment. Tracking is provided for all orders.

You have 30 days from the delivery date to request a return, and every return needs a Return Authorization (RMA) number before you ship anything back.

If the problem is on our end, meaning the item arrived damaged, defective, or is not what you ordered, we cover the entire cost. We email you a prepaid label and either replace the item or refund you in full, including your original shipping. Test-fitting a unit or powering it on for the first time does not void a genuine defect claim.

If you change your mind, we accept unused products in new, resalable condition, with these terms:

• Return shipping is your responsibility. We can email a prepaid label at our discounted carrier rate and deduct that cost from your refund, quoted exactly when we issue your RMA.
• If the order shipped free, our actual outbound shipping cost is deducted from your refund. Free shipping is a promotion we absorb on the way out, not a two-way service.
• A 15% restocking fee applies to opened items and to any return that requires us to re-inspect, re-test, or repackage the product.
• The item must arrive complete with all hardware, accessories, manuals, and original packaging.

Approved refunds are processed within 5 to 7 business days of inspection, back to your original payment method. Full terms are on our Return and Refund Policy page.

Yes, always. Packages sent to us without an RMA number may be refused or returned to sender at your expense, and returns should never be sent to the manufacturer.

Email contact@audiointensity.com or call or text 931-563-5151 with your order number and the reason for the return, and we will issue your RMA along with return instructions and the exact return address. Mark the RMA number on or inside the package.

The following are final sale:

• Custom and made-to-order enclosures, including all Proline X enclosures built to your specification
• Special order items brought in specifically for you
• Clearance and open-box items marked final sale
• Downloadable software, including Goldhorn software downloads
• Gift cards
• Products damaged by improper installation, incorrect wiring, or misuse

If your item arrives defective or damaged and you want the same item, we replace it at no cost to you. Contact us for an RMA and a prepaid label and we will ship your replacement.

If you want a different item, model, or size, we handle it as a return of the original under the change-of-mind terms above, paired with a new order for the item you want. This keeps pricing and stock accurate on both items.

No. A return covers the first 30 days and applies to items that are wrong, defective on arrival, or no longer wanted. If a product fails after correct installation and normal use, that is a warranty claim, and coverage, terms, and timelines are set by each manufacturer. Contact us either way and we will help you start the claim, through the manufacturer or directly through us where we handle it.

Call or text 931-563-5151, Monday through Friday 9am to 5pm CST, or email contact@audiointensity.com. We provide support for installation questions, system design, compatibility, and tuning guidance.