All items tagged with Helmholtz (10)

Bass Reflex Performance Envelope - Part 3: A Practical Example

March 20, 2024 by Gary Gesellchen

Bass Reflex Performance Envelope - Part 3: A Practical Example

In this article, Gary Gesellchen (Vanatoo) completes his Bass Reflex Performance Envelope exploration. After concluding the main analysis portion of the article determining his novel approach to estimating the performance envelope available from bass reflex loudspeakers, Part 3 shows an example to see how his calculations all work together, and addresses some practical considerations. This article was originally published in audioXpress, September 2023.

Bass Reflex Performance Envelope - Part 2: System Analysis

March 13, 2024 by Gary Gesellchen

Bass Reflex Performance Envelope - Part 2: System Analysis

This Bass Reflex Performance Envelope article series describes a novel approach to estimating the performance envelope available from ported loudspeakers. Part 2 expands on the system analysis, showing how driver and port sizes determine how loud and how low a system will play, and how that relates to generally available drivers. This article was originally published in audioXpress, August 2023.

Q Acoustics Introduces 5050 Flagship Home Speaker Model

March 8, 2024 by Alfred Moody

Q Acoustics Introduces 5050 Flagship Home Speaker Model

British audio brand Q Acoustics announced an expansion of its popular 5000 loudspeaker series with the arrival of the 5050 – the flagship model. The largest speaker in this stereo and home cinema loudspeaker range, this two-way floorstanding design has the scale, power and poise to bring music vividly to life. Boasting two 6" woofers, the biggest mid/bass drivers, custom developed for the series, the 5050 will fill even the largest listening rooms.

Bass Reflex Performance Envelope - Part 1: The Foundation

March 6, 2024 by Gary Gesellchen

Bass Reflex Performance Envelope - Part 1: The Foundation

Targeting speaker designers/builders, Gary Gesellchen (Vanatoo) wrote a sequence of three articles discussing Bass Reflex Performance. Essentially, this series takes a novel approach to estimating the performance envelope available from ported loudspeakers, considering port and driver sizes and multiple applicable parameters, and comparison with the performance from a passive radiator. This article was originally published in audioXpress, July 2023.

Patent Review: Acoustic Resistive Elements for Ported Transducer Enclosure

May 31, 2023 by James Croft

Patent Review: Acoustic Resistive Elements for Ported Transducer Enclosure

This review highlights a patent granted to Bose Corp, part of an interesting series of bass reflex and tuned pipe enclosure architectures explored by Bose, which James Croft reviews and explains in detail. The patent describes a single chamber, single tuned, bass reflex enclosure system, using a more advanced, single Helmholtz tuned bass reflex design, with a port that is folded and extended. A great patent review with lots of informative details. This article was originally published in Voice Coil, October 2017.

Sound Control: The Ubiquitous Helmholtz Resonator

May 31, 2023 by Richard Honeycutt

Sound Control: The Ubiquitous Helmholtz Resonator

Our readers that follow Richard Honeycutt's column Sound Control know how this series of articles covers the most fundamental topics in acoustics and electroacoustics. Most people who have been around acoustics or acousticians have heard of the Helmholtz resonator. In this article, Honeycutt discusses the extraordinary scientist for whom this device is named - Hermann Ludwig Ferdinand von Helmholtz (1821–1894) - and examines how the resonator works, as well as its uses. This article was originally published in audioXpress, January 2017.

Patent Review: Extended Duct with Damping for Improved Speaker Performance

January 11, 2022 by James Croft

Patent Review: Extended Duct with Damping for Improved Speaker Performance

This article reviews a patent granted to Apple, describing an electronic audio device including an enclosure having an acoustic output opening and a speaker positioned within the enclosure, as implemented in the company’s range of iMac desktop computers. The speaker and the acoustic output opening are acoustically coupled by an acoustic output pathway and damping chamber. Apple’s patent cites the Matsushita patent as prior art, but this is a more developed concept. This article was originally published in Voice Coil, December 2015.

Sennheiser Introduces IE 900 Flagship Earphones With Improved X3R Transducer

May 12, 2021 by audioXpress Staff

Sennheiser Introduces IE 900 Flagship Earphones With Improved X3R Transducer

Technical innovation, meticulous attention to detail, and an uncompromising demand for perfection to deliver a listening experience without compromise. These are the premises for another ambitious product development from Sennheiser, the new IE 900 around-the-ear earphones. The high-end concept required designing a completely new 7mm driver, the X3R, to match the product’s flagship status.

How Good Is Your Port

January 9, 2019 by Bohdan Raczynski

How Good Is Your Port

Ported enclosures are known to extend the low-frequency output of loudspeakers by exploiting the Helmholtz resonator effect produced by the compliance of the air inside the enclosure and inertance of the air in the port. This article looks at the problem of port nonlinearity to determine the correct port size, and the acoustic impedance of the port under high air velocity. This article was originally published in audioXpress, September 2001.

Get Ready for What’s Coming with audioXpress January 2017!

December 9, 2016 by audioXpress Staff

Get Ready for What’s Coming with audioXpress January 2017!

audioXpress January 2017 is now available. This month, we review Kii Audio’s new Kii Three speakers, and report on the most interesting new products at The Rocky Mountain Audio Fest (RMAF) 2016. We explore Near Field Magnetic Induction (NFMI) wireless audio applications, and the new USB Audio Device Class 3.0 specification for USB Type-C. We discuss streaming DSD over the Internet, revisit the Helmholtz resonator, explain how to build a Low-Power, Class-A Power Amplifier, and interview Michael Carnes of Exponential Audio. There is a lot to read inside this issue!