Question about SPL Audio Phantom DK2-1000 Car Amp

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Need help if you have a 4 ohm subwoofer how do you tell if the amp is powering it at 4ohms or 2 ohms

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Hello bully_bread,

Your amp will be powering the sub at 4 ohms.

The impedance or "load" that the amp sees is determined by the number of voice coil(s), the number of sub(s), and how they are connected. Whatever that final load, it is the impedance or "ohms" that the amp is supplying power at.

A single 4 ohm sub with a single voice coil cannot present a 2 ohm load. However, a sub with dual 4 ohm voice coils wired in parallel will present a 2 ohm load.

Here's a link to Rockford_Fosgate's "wiring wizard" where you will find all combinations of subwoofer wiring and the resulting loads.

http://www.rockfordfosgate.com/rftech/woofer_wizard.asp

Hope this helps.

Posted on Apr 13, 2009

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