Is STC 32 worth $300 more than STC 27? Hear it. See it.
Four typical window packages, from builder-grade double pane to a laminated acoustic unit. Pick a sound, press play, and switch windows while it plays. The analyzer shows what comes through, band by band, against what the laboratory curve predicts. Curves are typical for each class; a manufacturer's laboratory report replaces them exactly.
🎧 Headphones or good speakers recommended. Laptop speakers cannot reproduce the low frequencies where these windows differ most. Set a comfortable volume with the window open, then compare.
Step 1
Pick a sound
Step 2
Pick a window, then switch while it plays
Compare to
Mode
Realism
Stopped
Real level is what you would hear indoors. Loudness matched removes the volume drop so you hear only which frequencies each window lets through: two windows with the same STC can sound different. "Inside a room" adds a small-room reverberation for realism; it is not in the laboratory data and the readouts ignore it. "As installed" lowers every band by 4 dB, the typical gap between laboratory and field results (ASTM E966 field tests commonly run 3 to 7 points below the laboratory rating).
Step 3
Dial in a rating
32 STC 26 OITC
+$300 per window
STC 25drag while it playsSTC 45
Glass
The curve is estimated from the rating and glass type (labelled est.). Price is the typical upgrade over the base window; edit it in the config. Drag while the sound plays.
Round 1 of 5. Listen to A and B. Which window has the higher rating?
then
Most people get the siren wrong. That is the point: the rating is one number, the window is a curve. Leave your details and we will send you the curve for your own product.
Sent. Thank you.
Outdoors
--dBA
at the window
Indoors
--dBA
through the window
The window takes out
--dB
press play
1/3-octave analyzer, outdoor (hollow) vs indoor (solid), dB SPL est.peak hold
OutdoorIndoorLab curve predictionBands where the two windows differ most
Spectrogram, last 15 s: outdoor above, indoor belowswitch a window while it plays
Transmission loss by band, dB
Faint grey area: where the energy of the chosen sound sits (A-weighted, relative). Shaded columns: bands where the picked window and the comparison differ by 4 dB or more. Dip markers: coincidence dip, the frequency where a pane of glass goes transparent to sound.
Hear it on your phone, headphones in
hearwall.com/demo
Window or door manufacturer? Dealer? Airport program? Get this built from your own test reports, branded, in a day.