All items in category Voice Coil Test Bench
Test Bench Dayton Audio’s UMII10-22 Ultimax II 10” Subwoofer
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.
Read more...
Voice Coil Test Bench: Scan-Speak’s D3004/666000 Metamodal TPCD Dome AirCirc Motor Tweeter
by Vance Dickason

Voice Coil 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.
Read more...
Test Bench: SB Acoustics Satori MR16TX-8 TPCD 6.5" Midrange
by Vance Dickason

Test Bench: SB Acoustics Satori MR16TX-8 TPCD 6.5" Midrange

The 6.5" MR16TX-8 TPCD Midrange from SB Acoustics' prestige Satori line targets hifi and high-end audio applications, and expands the company's already significant investment in TPCD Textreme diaphragms. The cone assembly consists of a curvilinear inverted single piece, "bowl" shaped TPCD cone, glued to an inverted NBR surround, with the remaining compliance coming from a flat BIMAX spider. The motor is an FEA-optimized neodymium magnet and a 1.4" voice coil with a nonconducting fiberglass former.
Read more...
Test Bench: Faital Pro HF110 1" Neodymium Motor Compression Driver
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).
Read more...
Test Bench: The New 7.5” MT19CP-8 Coincident Coaxial Driver from the SB Acoustics Satori Line
by Vance Dickason

Test Bench: The New 7.5” MT19CP-8 Coincident Coaxial Driver from the SB Acoustics Satori Line

The new 7.5" coaxial driver from SB Acoustics' prestigious Satori line is built on a rather stylish aluminum-cast frame, totally open below the spider, with a cone featuring SB's proprietary Egyptian Papyrus material with a three-roll coated cloth-type surround, driven with a 1.52" diameter voice coil and neodymium magnet. The 1" tweeter is comprised of a coated cloth-type dome diaphragm, powered by a neodymium motor, which incorporates a resonant back chamber design.
Read more...
Test Bench: Purifi Audio PTT10.0X04-NAB-01 10” Midbass Woofer
by Vance Dickason

Test Bench: Purifi Audio PTT10.0X04-NAB-01 10” Midbass Woofer

The eagerly awaited Purifi Audio PTT10.0X04-NAB-01 10" Midbass Woofer is the sixth Purifi driver to be examined in Test Bench. This 4Ω woofer features extensive proprietary technology that includes the constant Sd surround, cone edge stiffening ring, and low magnetic hysteresis motor design. The PTT10.0X04-NAB-01 exhibits some very unique engineering that can be finally characterized.
Read more...
Test Bench: The 5" MR13TX-4 TPCD Midrange from SB Acoustics’ Satori Line
by Vance Dickason

Test Bench: The 5" MR13TX-4 TPCD Midrange from SB Acoustics’ Satori Line

This latest MR13TX-4 midrange from SB Acoustics is part of the fast-growing Satori line of high-end transducers. A dedicated 5" midrange driver, the MR13TX-4 is the 10th TPCD TeXtreme diaphragm transducer to be featured in Test Bench. In terms of features, the MR13TX-4 is built on a proprietary two-piece cast-aluminum frame, completely open below the BIMAX spider for cooling. The cone assembly consists of a curvilinear inverted single piece "bowl" shaped TeXtreme cone and an inverted NBR surround, driven by a 1.2" diameter voice coil and a neodymium motor.
Read more...
Test Bench: B&C Speakers’ DE640-16 Compression Driver
by Vance Dickason

Test Bench: B&C Speakers’ DE640-16 Compression Driver

The B&C Speakers DE640-16 Compression Driver is a 1.4" exit design, which along with the recent DCM414 midrange and the DE360 models represent a line of two-point suspension ring radiator type compression diaphragms. The DE640-16 features a 65mm (2.6") Polymer diaphragm and neodymium ring magnet and is specified for a recommended crossover frequency around 1kHz, and a 140W continuous power rating. For this Test Bench, the DE640-16 was matched with the Eighteen Sound XT1464 elliptical flare horn.
Read more...
Test Bench: The M3 Carbon Midrange Car/Home Audio Transducer from Stereo Integrity
by Vance Dickason

Test Bench: The M3 Carbon Midrange Car/Home Audio Transducer from Stereo Integrity

This Test Bench explores an interesting transducer from Stereo Integrity, a company founded in 2001, targeting the home and automotive audio markets. The Stereo Integrity M3 is a 3.5" carbon fiber midrange driver with neodymium motor, only 52mm (2") in depth. The M3 includes a black woven carbon fiber/paper sandwich curvilinear cone and 1.1 convex dust cap, with suspension provided by a synthetic copolymer surround plus a flat 55mm diameter cloth spider.
Read more...
Test Bench: B&C Speakers 1” DH450-8 Compression Driver
by Vance Dickason

Test Bench: B&C Speakers 1” DH450-8 Compression Driver

The DH450-8 ultra-compact compression driver from B&C Speakers incorporates a 1.7" high temperature Polymer diaphragm driven by a 44mm voice coil wound with aluminum wire on a high Qm Kapton former. Its most fascinating feature is the patent-pending phase plug with a deliberately twisted internal channel, which is intended to improve the overall frequency response. For this characterization, the DH450-8 1" neodymium driver is measured along with the B&C Speakers ME10v2 90x60 hyperbolic cosine flare horn, made from injection-molded ABS. This article was originally published in Voice Coil, August 2024
Read more...