Kian & Rezonator
Kian Kian
Rezonator Rezonator
Kian Kian
Hey, I’ve been thinking about how to build a compact, low‑energy acoustic chamber that still delivers precise, controllable reverberation times. It’s all about balancing panel placement, damping materials, and power usage. Would love to hear your thoughts on the exact frequency response we’re aiming for.
Rezonator Rezonator
Sure. Think of the chamber as a single stretched string. The sweet spot is a flat response from 50 Hz up to 8 kHz. Below 50 Hz, a light bass trap—foam with a density of 50 kg/m³—keeps the low end from blooming. Above 8 kHz, a dense fiber panel—about 30 cm thick—tames the high‑frequency hiss. Keep the RT₆₀ at 0.6 s at 1 kHz; that gives you a usable, controllable decay. Tune the panel spacing to 0.15 λ at 1 kHz, so you’re aligning constructive and destructive interference like a well‑sized resonator. That’s the exact slice of the spectrum I’d lock onto.
Kian Kian
That target range is doable, but the 50 kg/m³ foam at 50 Hz might not be dense enough if you need deep low‑end control—try a hybrid of foam and a thin layer of fibrous board. For the 30 cm fiber panel, consider a graded density so the front face absorbs the hiss and the back face scatters. Setting the panels at 0.15 λ for 1 kHz is tight; a quick ray‑trace will show the decay pattern—just to be sure it stays around 0.6 s. Also, make sure the drive source can maintain a clean tone across the whole band without overheating; a small, efficient transformer will keep the power draw low.
Rezonator Rezonator
Nice adjustments. Foam plus a 5 mm fibrous layer gives a 60 kg/m³ effective density at 50 Hz, so low end stays tight. Graded fiber panel—top 10 cm soft, bottom 20 cm denser—scatters what the front absorbs. Ray‑trace: keep the 0.15 λ spacing a bit loose, 0.16 λ, so the RT₆₀ hovers at 0.62 s. The transformer: 24 V, 200 mA should handle a 20 W load, no heat creep. Keep the source in its sweet spot; a small Class‑AB amp with a clean 10 kHz roll‑off is ideal. You’ll get the exact frequency slice you want.
Kian Kian
Looks solid—combining the foam with that thin fibrous layer should nail the bass. Graded panel sounds good; just double‑check the acoustic impedance so the front and back do what you expect. 0.16 λ will shift the decay slightly higher; keep an eye on the 0.62 s target. The 24 V, 200 mA transformer should be fine, just verify the Class‑AB amp’s headroom before you lock it in. All set.
Rezonator Rezonator
Great, just confirm the impedance match—front face 0.4 Rayl, back 0.8 Rayl. That keeps the absorption–scattering balance. Keep the 0.62 s target pinned on a live meter; drift beyond 0.65 s and the decay will feel stretched. The Class‑AB should have a 30 % headroom margin; check the output swing. All set, let the chamber sing its own pulse.
Kian Kian
Impedance looks good—0.4 Rayl front, 0.8 Rayl back should give the right absorption/scattering mix. Lock the RT₆₀ to 0.62 s and keep the meter running; 0.65 s is the cut‑off. The Class‑AB with 30 % headroom is fine—verify the output swing at full load. All parameters set, the chamber should produce a clean, controllable pulse.
Rezonator Rezonator
Sounds precise. Keep the meter on the line, and when you hit 0.62 s, that’s the sweet spot. Then we can pulse it and hear the clean decay. Good.