Publications
Articles
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Handbook for Sound Engineers, 6th Edition
Release date: November 26, 2025. Hadi Sumoro contributed a new chapter, "Sound System Verification," and revised the "Small Room Acoustics" chapter. |
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2025 Audio Tales from HX Audio Lab
A compilation of case studies from our recent projects, featuring somewhat heavy audio and technical discussions.
A Tale of Options
Case Study: Congregation Rodeph Shalom, Philadelphia, PA
- The Renkuz Heinz steerable array provides good coverage!
- Some nuts and bolts of creating spatial averages.
- Studying the room sound by observing averages of direct sound field vs steady state responses.
- It is recommended to read "A Tale of Muddiness" prior to reading this article
A Tale of Muddiness
Case Study: Pine Grove Auditorium, Pine Grove, PA
- The RPG Modsorbor panels really clean up the 'mud'!
- Complex sound system setup with Biamp IV6 arrays and LVH-909.
- Studying the room sound by observing averages of direct sound field vs steady state responses.
A Tale of Quietness
ProSoundTraining Link
Case Study: Keeping the Sound at a Certain Area
- The Fulcrum CCX series performs well!
- Noise prediction vs measurement.
Tweaking Phase Response with FIR Filters
Comparative Demonstration of Loudspeaker Response in regard to phase response.
Can you hear phase response changes?
Does phase response change affect the waveform shape/envelope?
Have you compared 2nd order vs 6th order crossover (same magnitude, different phase response)?
Does flat phase sound better?
PPSX (Microsoft Office 2016 or newer)
PDF (Adobe Reader)
2021-05; revised: 2023-02
Compensating Room Effect with EQ
Comparative Demonstration of EQ creation by factoring in Room Effect
PPSX (Microsoft Office 2016 or newer)
PDF (Adobe Reader)
2021-04; revised 2023-02
When the Volume Knob Goes to the Right
The Basics of Sound System Design in Layman’s Language
ProSoundWeb Link
ProSoundTraining Link (login may be required)
Translasi bahasa Indonesia
2020-07
Capturing the Room Impulse Response with an Ambisonic Mic
Inspecting the Use of an Ambisonic Mic/Recorder for Acoustic Work
ProSoundTraining Link (login maybe required)
2020-04
The Volume Knob also Goes to the Left
A Tale of Loudness
ProSoundTraining Link (login maybe required)
Translasi bahasa Indonesia
2018-07
A Meaningful Loudspeaker Phase Response
Understanding Different Views and Thoughts of Phase Response Curves
ProSoundWeb Link
ProSoundTraining Link (login maybe required)
Translasi bahasa Indonesia
2016-11
FIR Filter for Audio Practitioners
Basic Introduction to FIR Filter Generation For Audio Systems
ProSoundWeb Link
ProSoundTraining Link (login maybe required)
2016-05, revised: 2017-02
Small Room and Loudspeaker Interaction
Understanding Loudspeaker Behavior and Acoustical Distortions in a Small Room
ProSoundWeb Link
ProSoundTraining Link (login maybe required)
2016-04, revised: 2018 & 2023
Cascading Biquads To Create Even-Order High/Low Pass Filters
2016-03
Creating Earthworks Mic Compensation in EASERA and Systune using Filter Hose
Creating Earthworks Mic Compensation in EASERA (v 1.2.13) and Systune (v 1.3.7) using Filter Hose (v 1.4.2).
2016-02
One Octave to Third Octave Interpolation
A simple estimation of third octave band data from one octave band data.
2016-01
Short Talks and Demonstrations
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This 5-minute video demonstrates that a well-designed sound system enhances the direct sound field and increases the direct-to-reverberant ratio. Such a system can effectively cut through background noise and deliver clear, impactful sound. What does this mean?
The meaning of “the sound system/loudspeaker cuts through the room noise.” The meaning of creating an “upfront” (in-your-face) feeling by using the correctly designed sound system. Demonstration of Direct to Reverberation Ratio. Auralization narration by Robert McNaull. 2025-02, duration: 5min. |
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Why do they fly loudspeakers?
2021-03, duration: 3min. |
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Loudspeakers are loud, why can't I understand the spoken words?
2021-03, duration: 3min. |
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A perspective of Sound System Optimization
2021-03, duration: 28min Sharing past experiences and perspectives regarding sound system optimization and answering FAQs such as: What is sound system optimization? Do you use ear to tune? What tools do you use? What method do you use? Do you teach sound system design/optimization? Where do you place your microphone? Do you use multiple location of microphone? What's your goal in sound system optimization? |
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Playing around with Nuendo 11 Intelligibility Meter
2020-12 Nuendo version: 11.0.0. 0-10min - brief Introduction and setup explanation. 10-30min - first trials of the Intelligibility Meter. |
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House of Worship New Building Project Listening to the room virtually with and without the proposed acoustical treatments (Video duration: 5min). Please use headphones for the best listening experience.
2019-08, duration: 5min. |
