Scosche’s EFX Competition line of subwoofers have been redesigned and upgraded for 2010. According to the folks at Scosche, there are improvements in both power handling and output, and the EFX subwoofers are also now better optimized for smaller enclosures. The woofers are good looking and appear ruggedly built, so we figured it would be a good idea to take a closer look at one of the most popular models the $219.00 (US), EFX C124D.
The EFX C124D is a 12-inch dual voice coil subwoofer, featuring a one piece injection molded polypropylene cone. The high gloss black cone is bonded to a wide rubber surround by high-tech adhesives as well as good old fashioned stitching for maximum reliability at full excursion. The cone is connected to the voice coil former assembly via a clever intermediate cone which is fully vented to improve cooling and maintain proper mechanical compliance. The 2.5-inch voice coils are wound on a heat resistant Kapton former, centered around a vented pole piece, and held in place concentrically by a linear type Nomex spider. Electrical connections are made via ubiquitous spring loaded terminals which will accept 10 gauge wire, and the heavy duty tinsel leads are woven into the spider. The magnetic motor assembly uses double stacked ferrite magnets, and is covered by a plastic trim housing for a clean finished appearance. Supporting the whole assembly is a stamped steel basket, finished in matching high gloss black powdercoat. A rubber gasket that is actually integrated into the surround, includes eight mounting screw holes and trims out the basket. A thoughtfully pre-applied gasket on the mounting surface provides an airtight seal to the enclosure.
Read on for Full Results
While the woofer was being exercised, a quick perusal of the EFX C124D’s owner’s manual indicated that the woofer is intended for either sealed or vented applications, but after checking over the published Thiele-Small parameters, it was quite evident the sealed system would be a much better choice. (A combination of low Fs and high Qes always indicates a preference for a sealed box) The EFX C124D has a recommended sealed enclosure volume of 1 cubic foot, (resulting in Qtc of about 1.4) but some quick math told me that 1.25 cubic feet would be better for critical listening.
So, I grabbed my trusty Makita and installed the woofer in a 1.25 cu.ft. sealed enclosure, with the 4 ohm coils wired in parallel for a 2 ohm load. I selected a second order crossover, with a low pass frequency of 100Hz.
My listening began with some basic performance tracks I always use just to see what’s what. Immediately, I noticed the exceptional output from the C124D. Even at low input power, the woofer sounded strong, and as I increased the juice, it just got progressively louder without complaint. The bass was very good sounding, with reasonably good articulation and without excessive boominess or ringing. In my enclosure, the bass was deep and sounded strong, maybe not quite as “tight” as some other woofers I have tested, but the output level was probably 3dB higher or more, so for the vast majority of folks the tradeoff is a no-brainer.
I played a widely varied mix of music, and from rap to rock or country to classical the C124D handled them all in stride, even when I occasionally pushed the 300 watt limit.
After my listening had been completed, I allowed the woofer to cool and normalize overnight, and then I measured it’s parameters. I’m happy to report the published specs are quite accurate, and well within the normal tolerances found in a subwoofer. Also, my measurements tracked almost perfectly with my previous math calculations, so building custom enclosures for this woofer should result in very predictable results, which is not always the case.
If you are looking for a moderately priced 12-inch subwoofer that has gobs of output, decent power handling, and you are a bit short on enclosure space, the EFX C124D may be just what you need. Plus you will not need a huge (read expensive) amplifier to drive them. A modest 500 watt amp on a pair of these babies in a two and a half cubic foot sealed box will rock anyone’s world!
For more visit www.scosche.com