Sample Listening Room
12 ft × 17 ft × 8 ftTypical Placement
8.3 dB
Optimized
4.8 dB
Key Findings
Your medium-sized rectangular room (12 ft × 17 ft × 8 ft) produces 27 resonant modes below 200 Hz. Energy concentrates in 4 problem bands — 63 Hz and 160 Hz are the strongest, where multiple axial and tangential modes stack up. Optimized placement reduces bass variation from 8.3 dB to 4.8 dB — a clearly audible improvement from grade C to B. The sweet spot is reasonably sized — good for a single listener but bass quality changes for adjacent seats.
Room Proportions
Hz (1/3-octave bands)
Room Modes
27 modes below 200 Hz4 problem bands — frequency ranges where modal energy piles up
2 axial + 3 tang. + 1 oblique
2 axial + 2 tang. + 2 oblique
1 axial + 3 tang. + 2 oblique
2 axial + 1 tang.
Between two parallel surfaces — strongest effect
Between four surfaces — moderate effect
Between all six surfaces — weakest individually
Bass Placement Zones
below 198 HzShows where floor-level bass energy builds up relative to the room average. Red zones will excite room resonances strongly — avoid placing subwoofers or speakers there.
Problem Frequency Bands
11% of the floor area is in the low-impact zone for bass placement. This room has limited safe placement options — optimization is especially valuable.
Modal Distribution
Modes per 10 Hz bin (20–200 Hz)
Schroeder Frequency
198 HzBelow 198 Hz, individual room modes dominate your sound. Above it, the sound field becomes diffuse and treatments have more influence.
Reverberation Time
Frequency (Hz)
Frequency Response
SBIR Analysis
Speaker-boundary interference creates cancellation notches where reflected sound destructively interferes with direct sound. Closer boundaries create deeper notches. Odd harmonics (3×, 5×, 7×…) also cancel, creating a comb filter.
Left Speaker
Right Speaker
Subwoofer
First Reflections
Sound that bounces off walls before reaching the listener. Reflections arriving within 15ms of direct sound are most critical for treatment.
Critical (<15ms) — 4 reflections
Later (≥15ms) — 2 reflections
Recommended Positions
Left speaker
2 ft 6 in from the front wall, 3 ft from the left wall
Right speaker
2 ft 6 in from the front wall, 3 ft from the right wall
Subwoofer
1 ft from the front wall, 2 ft from the left wall
Listening position
8 ft 6 in from the front wall, 6 ft from the left wall
Sweet Spot Analysis
Medium Sweet Spot
29% degradation within 30cm
Good for a single listener with some head movement. Adjacent seats will notice a difference.
Tips & Recommendations
Good room proportions
Your room dimensions fall within the Bolt area — a range of ratios known to distribute room modes more evenly. This gives the optimizer a strong foundation to work with.
Problem frequency bands
Strong bass energy concentrations at 63 Hz, 160 Hz. Multiple modes pile up in these frequency bands, creating pronounced peaks and nulls. The optimizer targets these bands.
Big improvement from optimization
Optimized placement reduces response variation by 3.5 dB compared to typical positioning. That's an audible difference — worth the effort to measure and place carefully.
Bass-heavy reverb
Low frequencies ring much longer than highs. This is common — hard walls absorb treble but not bass. Corner bass traps (thick, floor-to-ceiling) are the most effective fix.