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For acoustic consultants

Modular calculations, with the drawing and the map built in

Every calculation is a block you can stack, re-use and take apart. Take off from the PDF, measure across the site map, and feed both into the sheet — in one window, so a job stops meaning four applications and a folder of exports between them.

Register interestSee what it does

In development · Windows, Intel and ARM · your files stay on your machine

Plant room to office — Timbral
FundamentalsPropagationMechanical
Hz2505001k2k4kRating
Fan sound power, Lw8379757166
Duct length, m1212121212
Lining thickness, mm2525252525
Attenuation, dB-13-21-24-22-17
Lp at grille7058514949NR 38
Octave bands · ISO 266editable input

Methods drawn from published standards and guidance

  • ISO 9613-2
  • ISO 266
  • BS 8233
  • CIBSE Guide B4
  • ASHRAE

What you get

Everything on one surface

The drawing, the sheet, the plot and the map sit side by side, so the work moves between them without an export in the middle.

  • Calculations that stack

    Each of the 56 calculations drops into the sheet as its own block: inputs, workings, result. Feed one block into the next and the chain recalculates end to end. Build a fan-to-grille run once and the parts stay separable, so you can change the duct lining without unpicking the rest.

  • Drawings, in the same window

    Open the PDF beside the sheet, set the scale once, then measure lengths and areas and mark up the drawing where you are working. Measurements land straight in the cells -- no second application, no retyping, no screenshot round trip.

  • Maps, in the same window

    Site plans as a pane like any other. Mark up receptors and barriers, measure distances across the site, and use them in the calculation without leaving for a mapping tool and coming back with a number.

  • Every save is an Excel workbook too

    Saving a .tmb also writes a full workbook inside it -- one worksheet per tab, plus a CSV per tab -- rebuilt from the live cells each time you save. Open the file as a zip and the shareable version is already there. Nothing to remember to export.

  • Worksheets that know their bands

    Octave (31.5 Hz to 8 kHz), 1/3-octave (25 Hz to 10 kHz, ISO 266) and low-frequency sheets, with Excel-style formulas over 800 functions and cross-sheet references. Bands are read from the headers, so a calculation fills the bands it covers and leaves the rest blank.

  • Plots that go in the report

    Chart a spectrum down the bands or across the rows, style it, and copy it out. Tables arrive in Word and LibreOffice as real tables with their structure intact, not one blob of text.

The library

56 calculations, seven groups

Each one drops into the sheet as a block: inputs you can edit, workings you can follow, and a result that updates as you change them. Every calculation cites the standard it came from.

Results write to the band columns they actually cover. A fan spectrum that only runs 63 Hz to 4 kHz leaves 31.5 Hz and 8 kHz blank rather than filling them with zeroes.

  • Fundamentals

    • Decibel arithmetic
    • Source count correction
    • A-weighting

  • Propagation

    • Point, line and plane sources
    • Near, mid and far field
    • Conformal and parallelepiped areas

  • Environmental

    • ISO 9613-2 barrier attenuation

  • Mechanical services

    • Fan sound power, CIBSE Guide B4
    • Duct attenuation, bends and junctions
    • Crosstalk, ERL, louvre directivity

  • Building acoustics

    • Room to room and facade break-in, BS 8233
    • Sabine and Eyring reverberation time
    • Mass law, composite transmission loss

  • Vibration

    • Vibration ratings

  • Ratings

    • NR
    • Rw (C; Ctr)
    • G-Rating
    • Weighted absorption and class

Pricing

Not set yet

Timbral is still in development. It will be a subscription per named user, with a per-seat rate for practices — the numbers will be published here before anyone is asked to commit.

Solo

For the consultant running their own projects.

TBCper seat

  • One named user
  • All 56 calculations
  • PDF take-off, map measurement and plotting
  • Updates for as long as you subscribe
  • Email support
Register interest

Practice

For a team sharing work across projects.

TBCper seat

  • Everything in Solo, per seat
  • Reassign seats as people join and leave
  • Invoiced annually if you prefer
  • Priority support
Register interest

Larger team, or a site licence?

Tell us how your team is set up and we will factor it in.

Get in touch

Questions

Before you buy

Anything else, just ask —send us a note.

When can I get it?

Timbral is in development and not yet on general release. Register your interest and we will let you know when it opens up, and what it will cost, before it goes public.

What will it cost?

Not decided yet. It will be a subscription, per named user, with a per-seat rate for practices. The numbers will be published here before anyone is asked to commit.

Which platforms does it run on?

Windows, on both Intel/AMD and ARM machines.

Do I need to be online to use it?

No. Timbral runs on your machine and your files stay there. It checks your licence when you activate, and occasionally after that, but your calculations, drawings and data never leave your computer.

Can I get my work out of it?

Yes, and you do not have to think about it. Every save writes a full Excel workbook and a CSV per sheet inside the saved file itself, rebuilt from the live cells each time. Sheets and plots also export to Excel, CSV and PDF on demand.

Where do the calculations come from?

Published standards and guidance, among them ISO 9613-2, ISO 266, BS 8233, CIBSE Guide B4 and ASHRAE. Each calculation cites its source in the app, so you can check the method and show your working.

Be first to know

Timbral is not open to everyone yet. Leave your details and we will get in touch when it is — and tell you what it costs before it goes public.

Register interest