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      10-31-2011, 07:02 PM   #1
VP Electricity
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Drives: E91 XDrive
Join Date: Jan 2008
Location: portland oregon

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Full audio system upgrade in 2011 E92 M3 w/EP

Just did a full system upgrade in a 2011 M3 with Enhanced Premium. Customer wanted to retain 100% OEM functionality, so current MOST interfaces were out.

The system we installed:

Morel Elate MT-23 28mm soft-dome tweeters

Hybrid Audio L4 SE "Carbon" (brand-new shallow midranges from HAT)

Jehnert XE200 shallow 8" woofers

Morel Ultimo SC122 carbon-fiber cone subwoofer

Two Zapco BTL attenuators and an Audio Control LC2i (for the LF channels)

Zapco DC200/DC500/DC1000 processor/amps

The system was set up with 50 watts per tweeter, 150 per mid, 150 per 8" midbass, and 500 for the sub. We retained the stock rear speakers, but set the fader to full Front, which mutes the rear speakers except during Rear PDC alerts. The client can bring the rear speakers in if they want, but he seems to have no desire for them. The rear sides and center were disconnected completely.

We used the DSP sections to compensate for some of the speaker-dependent EP equalization (that was mostly in the upper treble and low bass - most of the EP system's equalization is actually for cabin acoustics) as well as to delay the cabin speaker signal so that we could allow the subwoofer signal to arrive in phase with everything else. We also optimized the signal for the driver's seat.

The goal, as usual for us, was as close to an OEM appearance as possible, with 100% reversibility. This requires dying of trunk liner to match, as BMW matching trunk liner is not available in the States.

One twist - we only had this car for 2 days! He dropped it off Thursday am, and picked it up Saturday am and drove it away. We used our Musicar adapter parts for mounting, and the Musicar E92 subwoofer enclosure. Without having these parts all prepped and ready to drop in, there's no way that this install could have been done in two days.
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