All items tagged with Voice Coil Issues (92)

Test Bench: Dayton Audio’s Ultimax II 8-22 8” Subwoofer

June 24, 2025 by Vance Dickason

Test Bench: Dayton Audio’s Ultimax II 8-22 8” Subwoofer

This powerful Dayton Audio Ultimax II 8-22 8" subwoofer from the company's recently upgraded series maintains many common features with the original Ultimax drivers. After having examined the Ultimax II 10" version in January 2025, this Test Bench looks at the new 8" version where the very stiff and thick carbon fiber cone stands out with the NBR surround, assisted by the two flat 6" diameter cloth spiders.

Test Bench: Faital Pro’s 5PR120 - 5” Pro Midrange Driver

June 17, 2025 by Vance Dickason

Test Bench: Faital Pro’s 5PR120 - 5” Pro Midrange Driver

The Faital Pro 5PR120 is a high sensitivity and high-power handling 5” midrange driver, built on a proprietary six-spoke cast-aluminum frame, with four vents below the spider mounting shelf, and additional cooling provided by a pole vent. It features a curvilinear inverted single piece “bowl” shaped paper cone and black anodized aluminum dust cap. The motor is a FEA-optimized neodymium ring, and driving the cone is a 32mm voice coil wound with round copper wire on a non-conducting Kapton former.

Enhancing Loudspeaker Efficiency and Bl(x) Symmetry with Virtual Voice Coil, Part 2

June 11, 2025 by Dario Cinanni

Enhancing Loudspeaker Efficiency and Bl(x) Symmetry with Virtual Voice Coil, Part 2

This is the second article detailing the design and simulation possibilities of the SpeakerLAB software and its Virtual Voice Coil (VVC) module for speaker designers. This simulation includes complete temperature management involved in loudspeaker calculus. The article also expands on audio transducer parameter prediction such as maximum SPL, analyzes key design components such as the magnetic circuit, and analyses the resulting simulated metrics that could help determine the highest efficiency.

Enhancing Loudspeaker Efficiency and Bl(x) Symmetry with Virtual Voice Coil, Part 1

June 4, 2025 by Dario Cinanni

Enhancing Loudspeaker Efficiency and Bl(x) Symmetry with Virtual Voice Coil, Part 1

This first article in a two-part series details the design and simulation possibilities of the SpeakerLAB software for speaker designers. In this article, the author explores its Virtual Voice Coil (VVC) module, for designing voice coils and predicting audio transducer parameters with maximum accuracy. The detailed analysis also explains one of the keys that allow the accuracy of VVC prediction, given by a complete temperature management involved in loudspeaker calculus.

Test Bench: Dayton Audio’s UMII10-22 Ultimax II 10” Subwoofer

May 14, 2025 by Vance Dickason

Test Bench: Dayton Audio’s UMII10-22 Ultimax II 10” Subwoofer

This Test Bench characterizes the Dayton Audio UMII10-22 Ultimax II 10" Subwoofer, a recent example of the upgraded, high-performance designs that succeeded the brand’s original Ultimax subwoofer line. Available for now in four diameters (18", 12", 10", and 8"), the common feature set for the new line includes a large aluminum shorting ring and aluminum pole sleeve for lower magnetic distortion, a lightweight and rigid woven carbon fiber cone assembly, high Xmax, with a frame and motor designed with extensive thermal venting, all optimized for compact sealed enclosures.

Test Bench: Scan-Speak’s D3004/666000 Metamodal TPCD Dome AirCirc Motor Tweeter

May 7, 2025 by Vance Dickason

Test Bench: Scan-Speak’s D3004/666000 Metamodal TPCD Dome AirCirc Motor Tweeter

Vance Dickason has spent some time characterizing the new Scan-Speak D3004/666000 tweeter, the first to combine a metamodal Thin-ply Carbon Diaphragm (TPCD) dome with the company's AirCirc motor. This new Scan-Speak tweeter is not a common "evolutionary" design but a joint manufacturing project with Swedish company Composite Sound to develop new second-generation TPCD diaphragms with the characteristics and able to rival the performance levels of a beryllium dome.

Spikes & Isolation: The Art of Speaker Decoupling for Optimal Audio Performance

April 30, 2025 by Dave Morrison

Spikes & Isolation: The Art of Speaker Decoupling for Optimal Audio Performance

This contributed article by IsoAcoustics' founder and president is an interesting piece that sums up his vast experience in the field, working with professional audio engineers, loudspeaker designers, and music lovers all over the world. The article explores how speakers physically interact with their supporting surfaces, the key factors that affect speaker decoupling, and the pros and cons of many common isolation approaches.

Voice Coil Focus: Quasi-Alignment Families

April 23, 2025 by Claus Futtrup and Jeff Candy

Voice Coil Focus: Quasi-Alignment Families

This article is another great contribution by Claus Futtrup, this time with direct support from Jeff Candy, the two creators of Speakerbench, the free to use web-based application for low-frequency analysis and design of loudspeakers. Another follow-up article for the Bass Reflex Alignments article series that was published in audioXpress and Voice Coil, this time, the authors discuss the important Quasi-Alignment Families where the fundamental idea is trying to approach a roll-off similar to the Butterworth B4 alignment (a maximally flat response) but compatible with real systems for which the driver Qt will not allow a true B4 alignment.

Test Bench: Faital Pro HF110 1" Neodymium Motor Compression Driver

April 9, 2025 by Vance Dickason

Test Bench: Faital Pro HF110 1" Neodymium Motor Compression Driver

This Test Bench characterizes a 1" conical exit compression driver from Faital Pro that was measured along with the brand's STH100 elliptical Tractrix flare horn (80° × 70°). Driven by a voice coil wound with aluminum wire on a high Qm non-conducting Kapton former, and powered by a neodymium ring magnet, the HF110 compression driver targets applications such as stage monitors and PA speakers with a 2kHz recommended crossover frequency (second-order or higher high-pass filter).

Speaker Box Alignments from Numerical Optimization - The Quasi-Chebyshev Alignment

April 2, 2025 by Lars Risbo

Speaker Box Alignments from Numerical Optimization - The Quasi-Chebyshev Alignment

After seeing many speaker designers returning to trial-and-error approaches that seem to forget the historical work and analytical approach, Lars Risbo decided to explore numerical optimization to synthesize attractive alignments both for reflex and passive radiator box types. This reference article basically expands on Claus Futtrup's "Loudspeaker Bass Reflex Alignments" article series published in audioXpress, and expanded with dedicated articles in Voice Coil.

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