As he and I have discussed on the phone, I'd use a Jensen Iso-Max CL-2RR. The transformers have metal cans on each one and the whole PCB is in a metal box. There is a lot of EMI in the air of the X5 - you can hook up an amp, connect the inputs to a regular GLI or LOC with transformers like a Soundgate, take a tweeter and connect it to the output of the amp, and move the LOC or GLI around in the car and hear the background noise that the GLI/LOC device picks up get louder and softer (the internal transformer coil acts as an antenna). We had the car TOTALLY quiet and then we stuffed the SOundgate FLI back in the side panel and the noise came back.

So that's why I bought the Jensen Iso-Max, and it worked VERY well. With a 1K sine wave test CD, we could not measure ANY DC offset on the outputs of the Iso-Max.

And the frequency response is stellar, especially in the low notes. Bass notes are often attenuated with GLIs because the low-frequency notes "look" like DC, and transformers don't pass DC until they get "saturated", so the lower a note, the worse the attenuation.

The Iso-Max is -3dB down at .25 Hz and 50K, respectively, and can handle 7V of signal at 20Hz before saturating.

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musicar northwest, portland oregon

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