I'm quite satisfied with the stock audio system on my 98 E300D. My only problem is electrical interference. To listen to music, I use a cassette adapter with either an iPod Touch or an iPhone 5s. I have not noted any interference when using the iPod (set to airplane mode so there are no radio signals). However, I frequently hear various electrical interference noises when using the iPhone. So far, I have not been able to detect any rhyme or reason as to the conditions that cause the interference (proximity, orientation, etc....). I should say that, when using the iPhone, I'm using the network (i.e. an internet radio station or accessing my music from the cloud).

Any ideas as to how to minimize or eliminate such interference? Thanks.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 163k miles
06 E320 CDI "Rutherford", Black on Tan, 182k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, frozen wastegate, ALDA delete, boost gauge installed

19 Honda CR-V EX 82k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife