Test Bench: Scan-Speak 28W/4878T00 10" Subwoofer

In this Test Bench, I examined the 28W/4878T00, a new 10” (28 cm) subwoofer from high-end OEM Danish driver manufacturer Scan- Speak. Scan-Speak’s 28W/4878T00 has a well-chosen feature set that includes a proprietary cast seven-spoke cast-aluminum frame that has minimal reflection surfaces and is completely open below the spider mounting shelf. Other features include a stiff, lightweight paper sandwich cone—further stiffened by a 3.25” convex coated woven fiber dust cap. This article was originally published in Voice Coil, September 2017.

This month I tested one of Volt Loudspeakers' signature products, the 3” VM752 midrange dome. The VM752’s features include a coated single-piece fabric dome/surround, a FEA-designed ferrite motor structure, and a 75 mm diameter Nomex/Kapton voice coil former wound with round copper wire. A short flare horn is built into the rear-mounted (0.75” depth) faceplate. The VM752 also offers 94 dB sensitivity, and 100 W (AES) rated power handling, has a 200 mm diameter ferrite magnet, with a 2 mm Xmax, and a 500-Hz-to-4-kHz operating range. This article was originally published in Voice Coil, September 2017.

The DFM-2535R00-08 compression driver I examined this month came from Tymphany. This is the first compression driver in the company’s new three model compression driver line from Peerless by Tymphany. The DFM-2535R00-08 has a 1” throat exit diameter and a 1.4” titanium diaphragm with a polyimide surround. This is driven by 35.5 mm diameter voice coil wound with round copper wire on an aluminum former (ASV). This article was originally published in Voice Coil, August 2017.

With a heritage of over 30 years designing and manufacturing loudspeaker components, Lavoce Italiana continues to expand its portfolio of OEM professional audio solutions. At the NAMM Show this year, Lavoce introduced several new products including 1.4” exit and 2" exit ferrite magnet compression drivers and a high sensitivity neodymium magnet 10”. Lavoce also appointed its very first official distributor for the USA.

This Test Bench focuses on a new Wavecor 6.5” subwoofer, the SW168WA01. This subwoofer has a generous feature set that includes a proprietary four-spoke stamped steel frame that is substantially open below the spider mounting shelf due to the eight 15×8 mm rectangular vents, and as part of Wavecor’s Balanced Drive motor format, the SW168WA01 further incorporates an aluminum shorting ring. This article was originally published in Voice Coil, July 2017.

Peerless by Tymphany announced that its STW-350F188PR01-04, a 15” subwoofer built for high-performance HiFi applications, previously previewed at trade-shows, is now available for distribution as part of the brand's catalog. The new STW-350, features an 8” voice coil, triple suspension, and a dual-spider design, providing superior low-frequency performance in a smaller-than-traditional enclosure.

In this Test Bench, Voice Coil characterizes the second of two new compression drivers from Brazilian pro sound OEM PRV Audio. Following the Test Bench of the D4400Ti-Nd, in this characterization Vance Dickason looks at the D4000Ph compression driver, a ferrite version. The D4400TiPh is part of a series of 2” throat 4” diameter voice coil compression drivers, in this case complemented with PRV Audio’s WGP22-50 2” bolt on 60° × 60° waveguide. This article was originally published in Voice Coil, May 2017.

This month’s Test Bench samples came from US OEM, Dayton Audio. I received a home audio 6.5” woofer, the DSA175, from the brand’s popular Designer Series of aluminum cone woofers. Each product in this line incorporates proprietary stamped steel frame with a thin mounting lip that enables front mounting without insetting the driver (surface mounted), high relative XMAX, with paper cones for the DS series and aluminum cones for the DSA series. This article was originally published in Voice Coil, December 2016.

The newest product line from Peerless by Tymphany is the SDF series of woofers, with sizes ranging from 10-15”, built for more bass in smaller-than-traditional enclosures. Designed with a 3” voice coil and a robust ferrite magnet system which enables higher power-handling, enhanced low-end response, and more linearity, the company is now shipping the SDF-250 10” Woofer, built for high-performance, high-excursion consumer and hifi applications.

For this Test Bench, Vance Dickason characterizes Wavecor’s new 8.75” high XMAX subwoofer, model SW223BD03. As Dickason reminds us, this new subwoofer is part of the brand's rather extensive line of subwoofers — ranging in size from 2.75” to 12”. Voice Coil featured the 4 Ω version of this device, the SW223BD02, in the April 2015 issue. Wavecor’s SW223BD03, which is the 8 Ω version. This article was originally published in Voice Coil, October 2016.