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Message: <blockquote data-quote="publicbus" data-source="post: 7291" data-attributes="member: 4310"><p>Got this interesting thread in 5-driver.com. It mentioned on a "free air" or "infinatebaffle" sub and also the alternator capacity.Here is the thread content :with an E39 you definately need a sub! the interior of the car is just too damn big not to use one.... JL Audio for example make some great subs for 'free air' or 'infinate baffle', this basically means bolting the sub under the shelf without using a box.I'm not going to go into great detail as to why (unless people want me to of course) but the interior of the E39 is good for sub-bass down to as low as 26hz....and thats damn low!As for amps it really depends on your budget, the alternator you have and your own personal taste in amplifier cosmetics. Just make sure you spend money on decent cable!The easiest way to get a signal to the amps is to use a good quality speaker to RCA convertor & take the feed for it from both rear deck speakers (L&R).As for the alternator, if you have for example a 100ah alternator, you only have maybe 30ah spare if your driving at night in the rain....if you then add an amp which needs upwards of 40ah to drive your speakers its gonna kill your alternator pretty quick. you shouldnt have a problem with one amp just be awareAnyone has done this in Malaysia?Cheers</p></blockquote><p></p>