Dayton Audio E150MR-4: a 5.5-inch carbon fiber midrange for DIY speakers
For speaker builders, Voice Coil's Test Bench column by Vance Dickason has a new entry on the Dayton Audio E150MR-4, a 5.5-inch carbon fiber midrange from the brand's Epique line, which targets high-end sound at a moderate price.
Some of the construction details are worth noting. The cone is a solid, curvilinear molded carbon fiber piece that looks like the old woven cones, with a solid aluminum phase plug and a positive-roll NBR surround. A 3-inch flat cloth spider provides the rest of the compliance. The voice coil is two layers of round copper wire on a 30 mm titanium former. Titanium has become popular for formers because it is more rigid than aluminum, resists deforming at high excursions and is paramagnetic.
The frame is a proprietary six-spoke cast aluminum design with narrow, tapered 8.5 to 10 mm spokes to reduce reflections. It is open below the spider shelf, and since the driver has no pole vent, air in the gap is channeled out over the front plate, which cools the motor. The ferrite motor uses a T-yoke with a copper cap shorting ring and an aluminum sleeve on the pole. Xmax is 2.7 mm and the RMS power handling is rated at 60 W, depending on the high-pass frequency you use.
The article goes on to the measured results, which I recommend checking if you are planning a three-way design.
Midrange drivers are often what decides how a DIY speaker sounds, so a measurement-based look like this is useful before spending money.
Source: audioXpress
Some of the construction details are worth noting. The cone is a solid, curvilinear molded carbon fiber piece that looks like the old woven cones, with a solid aluminum phase plug and a positive-roll NBR surround. A 3-inch flat cloth spider provides the rest of the compliance. The voice coil is two layers of round copper wire on a 30 mm titanium former. Titanium has become popular for formers because it is more rigid than aluminum, resists deforming at high excursions and is paramagnetic.
The frame is a proprietary six-spoke cast aluminum design with narrow, tapered 8.5 to 10 mm spokes to reduce reflections. It is open below the spider shelf, and since the driver has no pole vent, air in the gap is channeled out over the front plate, which cools the motor. The ferrite motor uses a T-yoke with a copper cap shorting ring and an aluminum sleeve on the pole. Xmax is 2.7 mm and the RMS power handling is rated at 60 W, depending on the high-pass frequency you use.
The article goes on to the measured results, which I recommend checking if you are planning a three-way design.
Midrange drivers are often what decides how a DIY speaker sounds, so a measurement-based look like this is useful before spending money.
Source: audioXpress
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