Arqen
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Independent acoustics site by designer Tim Perry, with technical guides on bass traps, porous absorber depth, diffuser geometry and speaker placement, plus free calculators. Gives enough theory and numbers to plan treatment for a specific room.
More resources on Acoustics
soundonsound.com
Sound On Sound is a long-running audio recording magazine and website. It publishes in-depth tutorials, gear reviews, and practical how-to articles on recording, mixing, mastering, microphone technique, DAWs, plugins, and studio setup.
prosoundweb.com
ProSoundWeb is a comprehensive online resource for professional audio engineers and live sound technicians, offering news, tutorials, features, and product reviews across live sound, recording, and studio gear.
Fundamentals of Audio and Music Engineering: Part 1 Musical Sound & Electronics
In this course students learn the basic concepts of acoustics and electronics and how they can applied to understand musical sound and make music with electronic instruments. Topics include: sound waves, musical sound, basic electronics, and applications of these basic principles in amplifiers and speaker design.
Master Handbook of Acoustics
A practical reference on sound behaviour in small rooms: absorption, diffusion, reverberation time, room modes, isolation and studio and listening-room layout. Gives the measurements and treatment decisions needed to diagnose and fix a real room.
Sound Systems: Design and Optimization
A manual for live sound system design: how loudspeaker coverage, arrays, and room acoustics interact, and how to align and tune a rig using measurement software. Readers learn to predict coverage on paper and verify it in the room.
Recording Studio Design
Newell works through the acoustic and structural design of studios: isolation, room geometry, control-room response, monitoring and ventilation, with case studies of built rooms. Explains why studio designs differ and what compromises each choice imposes.