Here are some docs that explain how to determine the OEM system in a BMW E82 1-series (US spec) or in a 3-series E90 sedan/E91 wagon/E92 coupe/E93 vert (also US spec).
Depending on the car, you have:
- Speaker-level, full-range, fixed EQ
- Balanced flat full-range
- High-power speaker-level, partial-range, fixed EQ
So it behooves you to do some figgerin'
Don't apply this information directly to the E60 5-series. The non-Logic 7 system in the E60 is a bastard hybrid PITA - deck power, high-passed and heavily EQd, to F and R, and external amplifier on the underseats. The Logic 7 system, however, matches these descriptions.
If you want to look at a list of E-codes, I recommend this Wikipedia article. Most lists on vendor websites contain errors or do not address the staggered introductions of coupes the year after sedans, etc.
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