acoustiColour

Acoustical Design

Referenced near field monitoring is a way to sit closer to your monitors with the idea that sitting closer to the speakers (70-220 cm. depending on room size), will reduce the sound of the room in the mix. Flooding the monitoring position with direct energy from the loudspeakers will reduce the impact from side wall reflections at the monitoring position. The more your ears hear the sound from the speakers directly, the more you hear the actual speaker as the speaker designer intended. Near field monitoring minimizes reflections from side walls..., but does not eliminate all room sound.

The widely accepted professional standard is the ITU-R BS. 775-1. The recommendation states clearly a few well-known points: the positioning of the reference listening point is at the centre of an imaginary circle having a radius between 2 m and 4 m (min. and max. radius defined in the ITU-R BS.1116–1 recommendation). Concerning positioning angles, in the horizontal plane, there should be 60 degrees between front left and right speakers, with the centre speaker in the middle. Both rear speakers should be placed within 100 to 120 degrees from the centre line. The acoustical axis of the front speakers should be approximately at the listener’s ear height, meaning 1.2 m. for the ITU.

Due to simple physics every listening room is causing acoustic distortions, which strongly degrades the tonal-, temporal- & spatial quality of sound, listening at the sweetspot.

An ideal closed acoustical space has:

• a perfectly diffuse sound field;
• evenly spaced absorption (symmetry);
• negligible single room modes;
• an exponential decay of sound vs. time (RT60);
• no background noise.

Standard room acoustical parameters are based on this ideal model.

A real closed acoustical space typically exhibits:

• a mixed sound field of direct, reflected and diffuse sound;
• unevenly spaced absorption (i.e. precence of audience);
• strong single room modes at low frequencies;
• multiple decays;
• high levels of background noise...

...unwanted artifacts which become more irratic in behaviour by a faulty loudspeaker setup.

Thus the key questions to be answered are:

• What are the key acoustic measurements?
• What different room acoustic measurement tools are there?
• How to analyze & qualify the measurements?

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Recources

(This website is always under revision!).

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About

acoustiColour crossing borders, connecting knowledge, ..and getting inspired by art & science.

Because music is art & sound science, in 1988 acoustiColour is founded by musictechnologist (multidisciplined & certificated: electronics-, audio-, recording-, mix-, mastering engineer, composer, sound designer) and teaching musician Marcel Wardenier.

(Call +31 6 26 46 20 88 or email me).

(...who is also having problems with beliefs and much prefers to let physics do the talking! (John Watkinson on Slaying Dragons)).

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For more information:

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Resources

Stuff acoustiColour uses daily and do highly recommend you to check them out!

Tools

Calculators:

• SRC (Alexey Lukin, Infinite Wave)
• Room Acoustics (Linkwitz)
• Room Acoustics (Winer)
• Room Acoustics (HOFA)
• Room Acoustics (Hunecke)
• Roommodes (Gold)
• Roommodes (Winer)
• Roommodes (Wieczorek)
• Roommodes (MH)
• RT60 (Wieczorek)
• RT60 (MH)
• Placement Options (NoAudiophile)
• Golden Triangle (Cardas)
• Golden Placement (Cardas)
• Absorbers & Diffusers (MH)
• Resonators (Helmholtz)
• Diffusors (Schrödinger)

Measuring Hardware:

• WC CC1 Master Word Clock
• WC BLA Micro Clock MKII
• I/O RME FF 400 (2)
• I/O RME HDSP 9632
• Mic MBHO MBNM 550 EL
• Mic (mod.) ECM8000L
• Mic MiniDSP UMIK-1
• Mic MicW i436
• Amp Hypex NC400 monobloc
• Amp MiniDSP PWR-16
• Amp Quad 303 MK3 monobloc

Measuring Software:

• Aliki (Adriaensen)
• ARTA (Mateljan)
• Baudline (SigBlips)
• DIGICheck (RME)
• Friture (Lecomte)
• Fuzzmeasure (SMUG)
• IQ-Analyser (HOFA)
• LIMP (Mateljan)
• MATLAB (MathWorks)
• REW (Mulcahy)
• RMAA (RightMark)
• STEPS (Mateljan)

Room Correction:

• Align2 (Ohl)
• BruteFIR (Torger)
• DRC (Sbragion)
• DRC Designer (Jordan)
• DSP (Barbour)
• Equalizer APO (Thedering)
• PORC (Bank)
• rePhase (Drugeon)

Miscellaneous Software:

• ARDOUR (Community)
• AU Lab (Apple)
• CALF (Community)
• Debian (Community)
• JACK (Community)
• KXStudio (Community)
• MIXBUS (Harrison)
• Sonic Pi (Sam Aaron, Community)
• SOX (Bagwell)
• UbuntuStudio (Community)

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Project Software Downloads:

Inspired by some of the most groundbreaking innovative audio pioneers/gurus acoustiColour created bootable CD/USB/VM images with clean builds of a hardened Debian Server for experimental dedicated realtime DSP Low-Latency JACK Audio Server Applications.

Disclaimer: as is, because this is work in progress.. (Altough functioning 99.99% stable in my audiolab 24/7!)
Please: don't forget to check out the tutorials & RTFM's!!

(And if you do read them, you'll notice how easy the concept is ported to other hardware platforms ☺!!)

(...acoustiColour simply loves the power of Open Source Software and Debian installed on a nowadays old useless-, but relatively silent Mac Mini 2,1+. Easily 'build' your own DSP power house running 16/24 bits 44.1/48/(96*) kHz., syncing on WC via S/PDIF signal using one of these instant functioning DSP bootable disk images.

• ISO iBruteFIR (Tutorials: 1 2 3)
• ISO iDRC (Tutorials: 1 2 3)
• ISO iHIAC-DSP (Tutorials: 1 2 3)
• ISO iSonicPi (Tutorials: 1 2 3)

(*) Dependent on production date of Mac Mini 2,1+

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