January February 2017 Page 36 January / February 2017

1 2 BY BUCK POMERANTZ AMPS & SU Power output: 250 watts RMS @ 2 ohms Best power-handling match: 167.5 - 332.5 watts RMS @ 2 ohms Crutchfield 14-gauge speaker wire #007CSW14 $0.59 per foot Crutchfield CK8 8-gauge amp power wiring #007CK8 $49.99 Sound Ordnance Bass Bunker sealed enclosure #777BB1212S $59.99 2. Memphis 15-SRX12D4 12" subwoofer (DVC 4-ohm, 250 watts RMS) #95315SR12D $84.99 1. Memphis 16-SRX250.1 Street Reference mono subwoofer amplifier #95316SR250 $169.99 A. I need a sub for my amp Let's say you have a Memphis Audio Street Reference SRX250.1 amplifier and want to use it to power a 12" subwoofer - which sub will work with this amp? This amp puts out 150 watts RMS at 4 ohms and 250 watts RMS at 2 ohms. To get optimum performance, we'll look for a 12" sub that can be wired as a 2-ohm load and can safely handle 250 watts RMS. The 2-ohm load can be achieved by using a single voice coil (SVC) 2-ohm sub or a dual voice coil (DVC) 4-ohm sub with its coils wired in parallel - SVC 2-ohm or DVC 4-ohm. Any sub with a top RMS rating between / and 1/ of the amp's output rating will work safely with the amp - a power rating between 167.5 watts RMS and 332.5 watts RMS. At crutchReld.com/allsubs we can filter by size, impedance, and power rating to narrow our search for the perfect match. The winner? A Memphis Audio Street Reference 12" sub. It can be wired for a 2-ohm load, and handles up to 250 watts RMS. Here's the full package: H ere are a couple of common scenarios: one customer calls needing a sub for the amp he owns; another wants an amp to power the subs she has. Matching components is like solving a puzzle where the amp's capa- bilities (X watts RMS into Y ohms) need to match the sub's specs (Y ohms and X watts RMS power- handling). Here's an overview of the process so you can see how it works. The key is to look at RMS power specs. Peak, max, and dynamic ratings are exag gerated, and really only used for adver tising. RMS specs refer to continuous performance. As for brand-matching, while it sometimes makes it easier to find compatible gear, it's not strictly necessary, as long as you're matching specs. 36 Free lifetime tech support on everything you buy from us. See crutchReld.com/tech

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