Acoustic design articles, project notes and material observations from KARIKA, the polyester acoustic panel studio in Bangalore.https://karika.in/en-inhttps://karika.in/journal/acoustic-panel-cavity-depth-nrc.htmlhttps://karika.in/journal/acoustic-panel-cavity-depth-nrc.htmlCavity depth is the half of acoustic specification that gets ignored. Same panel, same material, different mounting. Same product can rate NRC 0.60 or 0.92. Built on KARIKA's 9 absorption curves from Intertek 2025.Sun, 10 May 2026 00:00:00 GMTArticlecavity depthacoustic ceilingNRCType A mountingType E400PET acoustic panelsHarshil Goyalhttps://karika.in/journal/open-office-acoustic-treatment-india.htmlhttps://karika.in/journal/open-office-acoustic-treatment-india.htmlBuilt from real Bangalore office installs. The seven acoustic moves that actually solve the open-plan noise problem in Indian workplaces, and the three popular ones that waste budget. With panel specifications, cavity depths, and what to put on your drawings.Sun, 10 May 2026 00:00:00 GMTArticleopen office acousticsoffice noise reductionPET acoustic panelsBangaloreoffice soundproofingspeech privacyHarshil Goyalhttps://karika.in/journal/what-is-nrc-acoustic-panels-india.htmlhttps://karika.in/journal/what-is-nrc-acoustic-panels-india.htmlHow NRC is measured, what the single number actually tells you, why two panels with the same NRC can perform differently, and how to verify a manufacturer's claim. Written for architects and acoustic specifiers in India.Sun, 10 May 2026 00:00:00 GMTArticleNRCnoise reduction coefficientASTM C423PET acoustic panelsspecificationHarshil Goyalhttps://karika.in/journal/wave-ceiling-open-workplace.htmlhttps://karika.in/journal/wave-ceiling-open-workplace.htmlA 5,200 m² floor plate where conversation moves freely. The wave baffle in umber pulls reverberation down without reading as an acoustic product.Wed, 01 Apr 2026 00:00:00 GMTProjectwave baffleopen officeumber200mm cavityHarshil Goyalhttps://karika.in/journal/faceted-ceiling-teal.htmlhttps://karika.in/journal/faceted-ceiling-teal.htmlTriangular panels rotated to break the flat plane of the slab. The teal reads warm under recessed light, cool from the open windows.Sun, 01 Mar 2026 00:00:00 GMTProjectfaceted ceilingtealtriangular panelsHarshil Goyalhttps://karika.in/journal/meeting-suite-warm-accents.htmlhttps://karika.in/journal/meeting-suite-warm-accents.htmlAn eight-person meeting room in two warm-bound KARIKA polyester acoustic colours: KA-7942 and KA-7948. The wall reads as one surface, in Bangalore.Sun, 01 Feb 2026 00:00:00 GMTProjectmeeting roomwarm tonesacoustic wallsHarshil Goyalhttps://karika.in/journal/bosch-straight-baffle.htmlhttps://karika.in/journal/bosch-straight-baffle.htmlAn open atrium served by a continuous baffle in charcoal. The baffle absorbs above 250 Hz; the slab does the rest.Thu, 01 Jan 2026 00:00:00 GMTProjectstraight bafflecharcoalatriumBoschHarshil Goyalhttps://karika.in/journal/grid-ceiling-forest.htmlhttps://karika.in/journal/grid-ceiling-forest.htmlA square grid pattern that reads from the floor as a quiet ceiling and from a phone camera as a portrait of the slab. Both readings are correct.Sat, 01 Nov 2025 00:00:00 GMTProjectgrid ceilingforest greenbaffleHarshil Goyalhttps://karika.in/journal/patterned-wall-sand.htmlhttps://karika.in/journal/patterned-wall-sand.htmlA 6.4 m wall surface laid in a half-drop bond. The pattern was cut on the same CNC pass as the colour library swatches.Mon, 01 Sep 2025 00:00:00 GMTProjectpatterned wallsandCNCfocus roomHarshil Goyalhttps://karika.in/journal/9mm-vs-12mm-note.htmlhttps://karika.in/journal/9mm-vs-12mm-note.html9 mm sheet runs 2000 GSM, 12 mm runs 2400 GSM. The acoustic difference is mid-frequency absorption, not headline NRC.Tue, 01 Jul 2025 00:00:00 GMTNotethicknessGSMpanel specificationHarshil Goyalhttps://karika.in/journal/cut-edge-matters.htmlhttps://karika.in/journal/cut-edge-matters.htmlEach swatch in the colour library is cut from a finished sheet, not a sample. The cut edge is what the architect sees on the drawing.Thu, 01 May 2025 00:00:00 GMTNotecut edgeswatchspecification detailHarshil Goyal