All items in category Voice Coil Test Bench
Test Bench: The AMT100H Driver from Eighteen Sound
by Vance Dickason

Test Bench: The AMT100H Driver from Eighteen Sound

The AMT100H driver from Eighteen Sound is the "little brother" of the AMT200P (with the XMT200 horn) air motion transformer (characterized in the November 2021 issue). Features for the AMT100H, include a rectangular throat with a Kapton diaphragm, a neodymium magnet structure, and a net weight of 1.84lb (0.835kg). This driver has a recommended crossover frequency of 1.2kHz at 24dB/octave. This article was originally published in Voice Coil, October 2023.
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Test Bench: SEAS’ New L22ROY2 8” Subwoofer from Its Extreme Line
by Vance Dickason

Test Bench: SEAS’ New L22ROY2 8” Subwoofer from Its Extreme Line

The new L22ROY2 8" subwoofer from Norwegian OEM manufacturer SEAS offers a well-appointed feature set that includes a proprietary cast 16-spoke (8 twin spokes) cast-aluminum frame, completely open 1" deep below the spider mounting shelf. Other features include a very stiff black anodized aluminum cone and dust cap, NBR surround, driven by a 2" voice coil. This article was originally published in Voice Coil, September 2023.
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Test Bench: SB Acoustics’ WO24TX-4 Satori 9.5” Midbass Woofer
by Vance Dickason

Test Bench: SB Acoustics’ WO24TX-4 Satori 9.5” Midbass Woofer

This midbass woofer is the latest product from SB Acoustics to feature a Composite Sound Thin-ply Carbon Diaphragm (TPCD) cone and another significant product from its Satori Line of high end drivers. The SB Acoustics WO24TX-4 Satori features a curvilinear inverted single piece “bowl” shaped TPCD cone. Clearly a material choice that is starting to conquer a growing number of speaker manufacturers in all application segments. This article was originally published in Voice Coil, September 2023.
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Test Bench: Fountek NeoCD2.0 High-End Ribbon Tweeter
by Vance Dickason

Test Bench: Fountek NeoCD2.0 High-End Ribbon Tweeter

The Fountek brand is now being manufactured by Shanghai Nada Technology (formerly Fountek Electronics), updating a large portfolio of high-end range of transducers (woofers, midbass drivers, full-range drivers, and ribbons high-frequency devices). The device that was sent to Voice Coil is the company’s current iteration of its Fountek NeoCD 2.0 ribbon tweeter. This article was originally published in Voice Coil, September 2023.
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Test Bench: The 18ME/9642T00 6.5" Midrange from Scan-Speak
by Vance Dickason

Test Bench: The 18ME/9642T00 6.5" Midrange from Scan-Speak

For this Test Bench, Vance Dickason measures the Scan-Speak 18ME/9642T00 Ellipticor 6.5" Midrange, the first driver to be offered only to Scan-Speak's OEM customers, not available on the DIY retail market. Benefiting from the oval (elliptical) voice coil shape that characterizes the Ellipticor range, this midrange also features the AirCirc motor structure, and Symmetrical Drive SD-2 motor format.
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Test Bench: Wavecor's WF182BD13-04 7" Midbass Driver
by Vance Dickason

Test Bench: Wavecor's WF182BD13-04 7" Midbass Driver

The Wavecor WF182BD13 is a midbass driver that utilizes a unique proprietary cone material made with interwoven Kevlar/Carbon fibers with beneficial properties for midrange reproduction - a combination of low mass, rigidness, and damping. Unique features include a vented inverted dome-type phase plug (no dust cap), a shallow profile low loss high Qm NBR surround, accompanied by a flat 4” diameter black cloth spider.
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Test Bench: The 10NMFS 10” Subwoofer from Beyma’s Near and Mid Field (NMF) Line
by Vance Dickason

Test Bench: The 10NMFS 10” Subwoofer from Beyma’s Near and Mid Field (NMF) Line

Beyma's Near and Mid Field (NMF) line includes this compact woofer aimed at the studio/home audio market, one of three models with a similar feature set that includes carbon fiber cones and dust caps, Malt Cross cooling technology, triple aluminum, and copper shorting rings, dual Bimax spiders, and Quattro inside/outside voice coil windings. This article was originally published in Voice Coil, August 2023.
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Test Bench: Fountek Electronics' NeoPro 5i 5" Diaphragm Ribbon Tweeter
by Vance Dickason

Test Bench: Fountek Electronics' NeoPro 5i 5" Diaphragm Ribbon Tweeter

This Test Bench article characterizes a ribbon tweeter from Fountek Electronics. This company from Shanghai, with manufacturing operations located in Hefei (Anhui Province), sent its NeoPro 5i high-end ribbon tweeter, which combines a large 145mm × 15mm reinforced sandwich ribbon diaphragm with a closed-back injection-molded rear cavity, two aluminum heatsinks and a built-in transformer. This article was originally published in Voice Coil, July 2023.
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Test Bench: The Stereo Integrity M25 mkII Surface-Mountable Tweeter
by Vance Dickason

Test Bench: The Stereo Integrity M25 mkII Surface-Mountable Tweeter

Founded in 2001, Stereo Integrity is an OEM speaker driver manufacturer from North Carolina that also designs its own range of hi-fi amplifiers, sold directly to consumers online. The company sent its M25 mkII high-end tweeter, which features a 25mm silk dome diaphragm and surround, a dual-magnet neodymium motor, a black anodized aluminum motor housing with a tuned rear chamber, two-layer CCAW wound voice coil, and a compact 50mm diameter face plate with a steel anodized grill. This article was originally published in Voice Coil, July 2023.
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Test Bench: The SB29SDNC-C000-4 29mm Compact Neo Cloth Dome Tweeter from SB Acoustics
by Vance Dickason

Test Bench: The SB29SDNC-C000-4 29mm Compact Neo Cloth Dome Tweeter from SB Acoustics

This Test Bench characterizes the SB29SDNC-C000-4 29mm cloth dome tweeter from SB Acoustics, a shielded neodymium motor driver with a compact 72mm diameter injection-molded face plate and large surround, featuring a copper cap shorting ring on the pole piece, internal pressure equalization, and a flow resistor for non-resonance cavity coupling. Another characterization of the innovative tweeter designs launched by Sinar Baja, developed by Ulrik Schmidt and Frank Nielsen at Danesian Audio.
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