There are some steps for upgrade the radio on BMW E34:
I. In this upgrade we address the inadequacies of the factory bass system
and underpowered factory amp. Stock systems are not equipped with subwoofers. Therefore, the best first investment is to add one to the existing system. To add a subwoofer to the factory system we need an amplifier to power it. We have a several choic- es here, depending on budget. The least expensive alternative would be to use a single 310rs.2 along with a P450 amplifier. Powering the new sub- woofer with any a/d/s/ P-series amplifier will allow use of the optional AC502 bass level controller for up-front bass level adjustment.
The next step would be to replace the under per- forming front speaker system with the 235is set which would be mounted in stock front locations. As in most BMW models, factory speaker positions are determined by stylists, not acousticians. As such, we recommend upgrading the 3-way stock system with a 2-way system.
ll. For this upgrade, we will use the same front speaker setup as in stage I.
To this we will will add a pair of a/d/s/ 235im coaxial speakers for rear fill and a single a/d/s/ 312rs subwoofer in a custom 1.25 cu.ft. box in the trunk. The custom box offers better driver control for the woofer along with higher playing level. It will be installed in such a manner that it “fires” through the ski sack.
Power for upgrade II will come in the from of an a/d/s/ P850 amp and will be distributed as follows:
50 watts to each front speaker set
50 watts to each rear speaker set
80 watts to each voice-coil of the 312rs from channels 5/6 and 7/8

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