Low Frequency in Loudspeakers: It’s All About the Bass!

All the speaker design techniques to achieve more bass, challenging Hofmann's Iron Law. The same bass in a smaller enclosure? Deeper or louder bass for the same enclosure back volume? Higher efficiency for a given alignment? A cleaner lower distortion bass? Learn about the companies, products, and technologies that make all this possible. This article was originally published in Voice Coil, November 2023.

Zami Schwartzman, the founder of Servobass, shares his journey into the application of Motion Feedback (MFB) methods for active subwoofers. He explores passive and active bass enhancement methods and how Servobass arrived at an optimized design using MFB techniques to achieve highly performing active subwoofers in desktop and compact sizes. A solution that is now available to be licensed by the industry. This article was originally published in audioXpress, November 2023.

From midbass to bass, Voice Coil November 2023 provides the lowdown on some of the loudspeaker industry's most interesting developments. James Croft explores a recently granted "Venturi expander" patent. Mike Klasco explores speaker design and signal processing techniques to achieve more bass, and Vance Dickason characterizes the Wavecor WF152BD09-04 6" midbass driver, and the UF295FAS Ultra Flat Series 10" thin-profile dipole woofer from Neotera.

audioXpress November 2023 offers an exclusive in-depth report on optical MEMS microphone technology from sensiBel, and understand how microphones can impact active noise cancellation performance. Learn how a new ADC Hybrid Gain Control IC enables smooth microphone preamp gain changes, and how to use DSP for hearing enhancement applications. Explore a Motion Feedback (MFB) approach enabling effective active desktop subwoofers, and recap on a century of Home Loudspeaker Development.

Servobass is the trade name for the products and technology designed by Zami Schwartzman, and which will be making its debut at CES 2023. The company will demonstrate its Motion Feedback Desktop Subwoofers, a new shallow "under the seat" MFB car subwoofer, and its ZRS-1 class-D plate amplifier, and is open to licensing opportunities. Servobass will be at ALTI Association Hospitality Suite at CES 2023, Lido 3101B - Level 3 of the Venetian Expo and Convention Center, and at the Menlo Scientific suite.

In this article, Zami Schwartzman shares his personal journey to design and perfect his own accelerometer-based motion feedback desktop subwoofers, including plate amplifiers with MFB control, crossover and voice coil thermal protection that can be matched with any low frequency MFB driver. The proof of concept demonstrated the ability to perfectly complement popular active nearfield monitors, mitigating the effects of room reflection. This article was originally published in audioXpress, September 2022.