All items in category Voice Coil Test Bench
Test Bench: Celestion CDX14-2420 1.4” Compression Driver
by Vance Dickason

Test Bench: Celestion CDX14-2420 1.4” Compression Driver

In this Test Bench I characterized the CDX14-2420 1.4” compression driver from UK Pro Sound OEM manufacturer Celestion. Designed for use with 1.4” throat horns, the CDX14-2420 has a 35.6 mm (1.4”) throat diameter driven by a 60 mm (2.4”) diameter voice coil wound with edgewound copper-clad aluminum wire (CCAW) on a high-temperature fiberglass non-conducting former, which drives a deep-drawn titanium diaphragm and polyimide surround. This article was originally published in Voice Coil, December 2018.
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Test Bench: Eighteen Sound ND4015BE Beryllium Compression Driver
by Vance Dickason

Test Bench: Eighteen Sound ND4015BE Beryllium Compression Driver

This Test Bench examines Eighteen Sound's ND4015BE beryllium compression driver, which was mated to an Eighteen Sound XR2064 60° × 40° horn. This compression driver is available in two versions, a 1.5" throat and a 2" throat. This review focuses on the 2" throat model. The ND4015BE has a 4”-diameter edge-wound aluminum voice coil on a nonconducting Nomex former, a 4" pure beryllium diaphragm with a polymer surround. This article was originally published in Voice Coil, February 2014.
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Test Bench: Celestion AN2075 2" Full-Range Compact Array Driver
by Vance Dickason

Test Bench: Celestion AN2075 2" Full-Range Compact Array Driver

The Celestion AN2075 has a 2”-diameter aluminum cone neodymium motor full-range transducer primarily intended for use in line source arrays. The AN2075 is built on a proprietary six-spoke molded-glass reinforced ABS frame. The cone assembly consists of a black anodized aluminum cone with a 19-mm diameter aluminum dust cap and whizzer-type extension. This article was originally published in Voice Coil, February 2014.
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Test Bench: SEAS Excel T35C002 Dome Midrange Tweeter
by Vance Dickason

Test Bench: SEAS Excel T35C002 Dome Midrange Tweeter

This month’s Test Bench driver is the T35C002 1.5” tweeter from Norwegian high-end home audio manufacturer SEAS’s home audio driver Excel line. The T35C002 is basically an Excel line version of the company’s Exotic line T35 Alnico V tweeter, but it uses a neodymium magnet, with a 1.5” coated cloth diaphragm sourced from German high-end diaphragm manufacturer Dr. Kurt Muller (DKM). This article was originally published in Voice Coil, April 2014.
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Test Bench: Punktkilde FSA621520-2300 2” Full-Range Driver
by Vance Dickason

Test Bench: Punktkilde FSA621520-2300 2” Full-Range Driver

Compact 1” to 2.5” diameter full-range drivers (micro speakers) are unquestionably one of the most used transducers in consumer electronics, finding broad applications in smart speakers, soundbars, and portable Bluetooth speakers. For this Test Bench we characterized the Punktkilde FSA621520-2300 2” diameter 3 Ω full-range driver. This article was published originally in Voice Coil, November 2018.
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Test Bench: Punktkilde FSB611015-1400 1.5” Full-Range Driver
by Vance Dickason

Test Bench: Punktkilde FSB611015-1400 1.5” Full-Range Driver

Compact 1” to 2.5” diameter full-range drivers (micro speakers) are unquestionably one of the most used transducers in consumer electronics. They are finding broad applications in smart speakers, soundbars, and portable Bluetooth speakers. This Test Bench examines the FSB611015-1400 neodymium full-range driver from Eastech's "designed in Denmark" Punktkilde line. This is a 1.5” diameter 4 Ω driver built on a proprietary stamped frame that is fully vented below the spider mounting shelf. This article was published originally in Voice Coil, November 2018.
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Test Bench: Dayton Audio RS180P-8 7” Reference Series Midwoofer
by Vance Dickason

Test Bench: Dayton Audio RS180P-8 7” Reference Series Midwoofer

The 7” RS180P-8 Reference Series midwoofer from Dayton Audio uses a nice six-spoke cast-aluminum frame with narrow 10-mm wide spokes to minimize reflections back into the cone. The cone assembly is composed of a three-part lightweight paper cone that combines Kevlar and glass fiber with the paper slurry. Cosmetically speaking, this is very good looking driver. This article was originally published in Voice Coil, May 2014.
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Test Bench: BMS 4507ND Dual Diaphragm Coaxial Planar Wave Driver
by Vance Dickason

Test Bench: BMS 4507ND Dual Diaphragm Coaxial Planar Wave Driver

The BMS 4507ND is a unique transducer that uses a neodymium coaxial compression driver to drive a planar waveguide intended for use in line arrays. BMS Speakers patented the two-way compression driver technology in 1997. This month’s Test Bench subject, the 6.5” 4507ND features a 300-Hz to 22-kHz bandwidth (6 to 22 kHz for the tweeter and 400 Hz to 6.3 kHz for the midrange). The rectangular planar waveguide is optimized for 0° to 15° vertical dispersion and up to 120° in the horizontal plane. This article was originally published in Voice Coil, May 2014.
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Test Bench: A 12-Inch NBR Pro Sound woofer from B&C Speakers
by Vance Dickason

Test Bench: A 12-Inch NBR Pro Sound woofer from B&C Speakers

In this Test Bench I characterized the 12BG76-8, a high power handling 12” NBR pro sound woofer from B&C Speakers. This month’s sample submission is in the upper range of power handling in this extensive group with a continuous power handling rating of 1000 W (500 W nominal). Applications range from two and three-way PA speakers and compact two-way designs for high SPL in limited spaces. Features for the 12BG76-8 are similar to most high-performance pro sound drivers, fairly substantial. This article was originally published in Voice Coil, October 2018.
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Test Bench: The Wavecor SW275BD01 Home Audio Subwoofer
by Vance Dickason

Test Bench: The Wavecor SW275BD01 Home Audio Subwoofer

This month, I characterized the SW275BD01, a 10.75" high-end home audio subwoofer from OEM manufacturer Wavecor. This driver has a well-appointed feature set that includes a proprietary cast eight-spoke (four twin spokes) cast aluminum frame, a very stiff black mica/paper composite cone, further stiffened by a 4" convex black hard paper dust cap. Suspension is provided by a FEA optimized low-loss (high Qm) NBR surround plus dual 6” diameter black flat conex spiders (dampers). This article was originally published in Voice Coil, October 2018.
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