Hear the rating.

Your test report in. A listening demo, a dealer close tool and a substantiated Noise Profile out, in five days.

hearwall.com

Jonathan Shank, NeoSpark Solutions, Brodhead WI
GlassBuild America, Las Vegas, September 2026

The $300 question

Is STC 32 worth $300 more than STC 27?

The homeowner cannot tell.

The dealer cannot show them.

The number is on the spec sheet and nowhere else.

33%of homeowners chose noise-reducing glass, the #1 optional upgrade (This Old House 2026, 1,000 homeowners)
$150 to $400sound-control upsell per window
$525average per window, $7,183 per project
The rating hides the shape

Same rating class, different shape.

1002506301.6k4k Hz20304050 dBSTC 36 double paneSTC 33 laminated
SirenSTC 33 wins35.9 vs 34.6 dB
Lawn mowerSTC 36 wins29.2 vs 25.0 dB

Same frame, Element lab data. FGIA TIR-A1-26 (10 Aug 2026): OITC has replaced STC for exterior products. Nobody can hear OITC either.

Hear it

30 seconds with earbuds.

Hearwall
Pick a sound
trafficaircrafttraindogslawn mowerconstructionHVAC
Press the product
STC 27STC 40
Report ESP024626P-19
1

Pick a sound.

2

Press the product.

3

Same recording, filtered by the product's own lab curve.

4

Report number on screen.

Try it now: hearwall.com/demo

How it works

Report in. Three deliverables out. Five business days.

1

Your ASTM E90 report

PDF from Intertek, Element, Riverbank, NGC or any accredited lab.

2

Hearwall derives the curve

1/3-octave TL. Checks STC (E413) and OITC (E1332). Builds a linear-phase filter.

3

Out in 5 business days

Branded hear-it page (single file, offline). Dealer close module. Noise Profile with substantiated claims.

Only publish STC/OITC? We build an estimated curve badged "est." until the report arrives.

Where the sale happens

Three places. One tool.

The kitchen table

Dealer in-home close.

The architect's spec review

OITC vs STC, on the product itself.

The airport design-review meeting

RSIP: "hear your package."

Sell where the $300 decision happens, not on a web widget nobody visits.

The Noise Profile

One page. Every claim traced to the report number.

Noise Profile · Series 500 casement, laminated 5/16
STC 36
OITC 29
  • Highway traffic 31 dB · Aircraft flyover 27 dB · Freight train 29 dB · Lawn mower 26 dB · Barking dog 34 dB · 12 sources
  • TL curve against the E413 contour
  • "Reduces highway traffic by 31 dB (A-weighted). Element report ESP0xxxxx."
$750per product
$1,500two-product comparison
5 daysfrom receipt of the report

STC and OITC, dB reduction for 12 sources, TL chart against the E413 contour, and claim lines with the report number.

Licenses

Pick the room you sell in.

Starter

$6,000per year
  • 5 product families
  • Branded hear-it page
  • Noise Profile per family
  • Quarterly refresh

Dealer

$12,000per year
  • 15 product families
  • Dealer module, 25 locations
  • $79 per location per month after
  • Lead capture and usage report

Program

$15K to $40Kper phase, scoped
  • RSIP, airport, condo boards
  • Approved package library
  • Homeowner page, consultant seats
  • Printed profile per package

Onboarding $350 per family. Custom work $200 per hour.

Pilot

Prove it first.

$5,000
90 days
  • 3 product families
  • One branded hear-it page
  • One Noise Profile
  • Dealer module for 5 locations
  • Credited in full to an annual license signed inside the 90 days
GlassBuild offer

Sign by 15 Oct 2026

Two extra Noise Profiles included ($1,500 value, inside the pilot).

Onboarding waived on the first three families at conversion.

Why it is believed

Built to survive a skeptic.

1

Report number on every screen

Nothing plays without its lab reference.

2

Headphone gate and level set

No playback until the listener is set up right.

3

Loudness-matched mode

Only the shape remains, so it cannot flatter.

4

Simulation disclaimer

On every page, every profile.

5

Neutral brand

No glass maker, lab or window brand owns it.

6

Your curves stay yours

Never on anyone else's page.

The dealer module

Close at the kitchen table.

Your street at 7 am
traffic, measured at the house
STC 27STC 32STC 40
Send me this comparison
name · email or mobileSend
Report G1234.01

Offline capable

Works in the basement with no signal.

Works with the quoting tool you already use

URL parameters into Paradigm, Windowmaker, Cyncly, Window Perfect.

Monthly usage by location

See which dealers play it and which do not.

Airport programs (RSIP)
$15.3M

FAA grant to San Diego, 1 Sep 2026, about 400 homes

Dec 2025
federal repair-and-replace pilot passed
MSP
program runs 2025 to 2032
Logan
program restarted

Programs specify STC 40 packages, and nobody plays the difference for the homeowner in the design-review meeting.

Hearwall Program
  • Approved package list in one library
  • Homeowner-facing page
  • Consultant seats
  • Printed Noise Profile per package
Who is behind it
JS

Jonathan Shank

NeoSpark Solutions, Brodhead WI
  • Audio DSP engineer; nearly 15 years in acoustics
  • Worked in the ATI (now Intertek) acoustical test lab in York, certifying windows and doors to STC and OITC
  • Built the original listening demos, sold through that lab to window makers; this is the rebuild for the OITC era
  • 20 years manufacturing operations and electrical engineering; AI-native builder
The engine
0.5 dB

OITC validated within 0.5 dB on five lab reports

Pure Python

Curve, ratings, filter design

Web Audio API

Playback in the browser, offline

The ask

Three ways to start.

1

Send one test report

Noise Profile in 5 days. $750.

2

Start a 90-day pilot

$5,000, credited in full.

3

Book a 20-minute call

hearwall.com · jonathan@neosparksolutions.com

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