Your own acoustic test report goes in. A branded listening demo, an in-home dealer close tool and a substantiated Noise Profile come out, in five business days. So a buyer can finally hear why STC 32 is worth $300 more than STC 27.
Walking the floor at GlassBuild America, Las Vegas, 23 to 24 Sept 2026. Meet there.
Noise-reducing glass is now the number one optional upgrade homeowners choose. The rating that justifies it lives on a spec sheet, and nobody has ever heard the difference between the two numbers on the quote.
Against a siren the STC 33 laminated unit wins (35.9 vs 34.6 dB). Against a lawn mower the STC 36 unit wins (29.2 vs 25.0 dB). Same rating class, different shape. Shapes illustrative; values from Element Materials Technology reports on one casement frame.
Not on a web widget. At the kitchen table where a dealer is defending a $300 line item. In the spec review where an architect is asked what OITC 29 means. In the airport design-review meeting where a homeowner is choosing between two approved packages.
One national brand has a live audio widget. Three glass makers built simulators between 2009 and 2016 and let them die. All of them were web pages tied to no transaction, built on generic curves rather than the maker's own report.
The input is your test report. The output goes to the person making the sale. The report number is on the screen. And it is neutral: no glass maker, lab or window brand owns it.
Any accredited lab: Intertek, Element, Riverbank, NGC. Hearwall reads the 19-band 1/3-octave transmission loss, checks STC to ASTM E413 and OITC to ASTM E1332.
Only publish STC and OITC numbers? We build an estimated curve that scores exactly those ratings, badged "est." until the report arrives.
Each product's curve becomes a linear-phase filter applied in the browser to real recordings: traffic, aircraft, train, dogs, lawn mower, construction, HVAC and more. Glitch-free A/B between products, loudness-matched mode so only the shape remains, headphone gate, limiter.
A branded hear-it page (single file, works offline, embeds anywhere). A dealer in-home close module for phones and tablets. A Noise Profile for each product with claims language traced to the report number.
Your products, your brand, your report numbers. One file you can host, embed in a product page, or hand to a rep on a phone. Unlimited views.
See the public version at hearwall.com/demo.
"Your street at 7 am." Three product buttons, a lead form, works in a basement with no signal. Links into the quoting tool you already use (Paradigm, Windowmaker, Cyncly, Window Perfect) by URL parameters. Monthly usage by location.
One page per product: STC, OITC, decibel reduction against 12 noise sources, the transmission-loss curve against the E413 contour, and claim lines your marketing team can publish, each citing the lab report number.
$750 per product, $1,500 for a two-product comparison. Five business days.
| Trust feature | What it does |
|---|---|
| Report number on every screen | Nothing plays without its lab reference. A skeptic can look it up. |
| Headphone gate and level set | Laptop speakers roll off exactly where window differences live. The page will not start until the listener is set up right. |
| Loudness-matched mode | Boosts each product by its computed reduction so only the spectral shape remains. The demo cannot be gamed by turning things down. |
| Simulation disclaimer | "Simulation from laboratory test data. Field performance depends on installation, wall construction and playback equipment." On every page and profile. |
| Your curves stay yours | Derived data for your products never appears on anyone else's page. The neutral public demo uses typical units only. |
Onboarding $350 per family, one time.
Onboarding $350 per family, one time.
Custom work $200 per hour, quoted in blocks.
Three families, one branded page, one Noise Profile, dealer module for five locations. The fee is credited in full against an annual license signed inside the 90 days.
GlassBuild offer through 15 Oct 2026 two extra Noise Profiles included, onboarding waived on your first three families at conversion.
Programs specify STC 40 packages and hold design-review meetings where a homeowner picks between approved products. Nobody plays the difference. Hearwall Program puts the approved list in one library, gives consultants a page for the meeting, and prints a Noise Profile per package for the file.
No booth, just earbuds and a phone. Thirty seconds and you will hear what your rating sounds like. Email jonathan@neosparksolutions.com with your booth number and a time, or bring a test report and leave with a Noise Profile the following week.
A simulation built from your laboratory measurement. The lab's 1/3-octave transmission-loss data is applied to a real recording. It shows the difference between products under the same conditions; it does not predict the exact level in a specific room. Every page says so.
You keep ownership of the report. Hearwall derives the curve and filter, shows product names, ratings and report numbers on your pages only, and never publishes your curves elsewhere. An NDA is available before you send anything.
Yes. Hearwall builds a plausible curve that scores exactly your published ratings under E413 and E1332, badged "est." on the page. When the report arrives the estimate is replaced, usually within a day.
Yes. The hear-it page and dealer module are single files with the audio embedded. They work in a basement with no signal, and sync leads when the phone is back online.
The dealer module accepts product and sound selections by URL parameters, so a quoting tool can open the right comparison from a line item. Deeper integrations are custom work at $200 per hour.
Hearwall warrants it holds the rights to every noise source it ships. Siren and infant cry are currently synthesized and labelled as such; licensed recordings replace them as they are added.
Hearwall is a working product name of NeoSpark Solutions LLC, Brodhead, Wisconsin, pending trademark clearance. Contracts are with NeoSpark Solutions.
Brodhead, Wisconsin. Jonathan Shank is an audio DSP engineer who spent years inside the ATI (now Intertek) acoustical test lab in York, Pennsylvania, certifying windows and doors to STC and OITC, and has worked with acoustics for nearly 15 years. He built the original listening demos there, and the lab sold them to window makers. Hearwall is the rebuild for the OITC era: the same idea, run as a pipeline from your report to your dealer's phone in five days, with the report number on every screen.
Engine: pure Python plus the browser's Web Audio API. OITC validated within 0.5 dB on five lab reports.