i have a 2004 bmw 325 ci and i want a touch screen head unit with blue tooth but i went to a local audio store and they said that i would have to chamge all speakers cuz they run 1 om. is this true or are there head units that work with the harmon kardon system i also want a sub and amp is it possible cuz i think the harmon kardon speakers sonund great just want a lil .ore base and the look of touch screen anx blue tooth. please and thank you.
The HK speakers are 3 ohms each. The interface between the factory head unit (hifi and HK usd the same head unit) and the factory amp (both hifi and HK) is balanced differential. Balanced differential signals have a higher voltage then line level/RCA signals. But they are lower in voltage than speaker level signals. So, if you’re keeping the HK amp and speakers you’ll need “line out converters” (LOCs) to transform the new head unit’s line level signals into balanced differential signals.
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