Quote:
Originally Posted by jonobro
Hifi
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As long as your Ohms match, they will all be interchangeable
Should all be 4 Ohms. You can pull any one of your speakers and it will have the Ohm rating on back
Brief description of two systems
HiFi BMW Upgrade
Audio option: S676A / S674A*
The BMW HiFi sound system is a noticeable upgrade with tweeters (usually 2) and a 6-channel amplifier onboard. Still, the graphic equalizer option is missing and leaves the listener with the same options as the previous sound system — bass/treble, front/back, and left/right.
Higher series vehicles with the HiFi option will also include an additional midrange speaker for the center-channel dash.
With this system, you’ll get more volume thanks to the amplifier, and also a cleaner audio signal coming into it as a result of a higher quality head unit. This amplifier can be easily swapped for BimmerTech's Premium Audio System for a quick and powerful audio upgrade. In addition to the replacement amplifier's improved performance, the 64-bit DSP with 30-band graphic EQ gives far more flexibility than the limited power of the stripped back factory equalizer.
Speakers for this audio option are considerably better than for the base (stereo) option. Nonetheless, a lot of listeners are dissatisfied with the sound quality and seek aftermarket upgrades
Bang & Olufsen BMW Upgrade
Audio option: S6F2A
Bang & Olufsen offer a premium audio system for certain high-end BMW models, namely the 5, 6 and 7 series, as well as the X5 and X6 (and their corresponding M equivalents). It features improved amplification, speakers, and a few other cool features.
With 16 channels and 1200W of total output power, the B&O amplifier certainly packs a punch.
Speakers are located in the same way as in the top Hi-Fi system, also divided into 2 subwoofers, 7 mid-ranges, and 7 tweeters. To add to its premium appearance, the side tweeters are illuminated, and the center channel speaker extends out from the dashboard.