Recommendations: 3GS compatible speakers without taking the case off?

[mcs37]

I've got an iPhone 3GS and am now on the hunt for some speakers that are GSM-shielded. OK, great, there are plenty of web pages out there listing these devices; here are two:

http://www.ipodrepublic.com/iphone-3g-speakers/
http://www.bestcovery.com/best-iphone-speaker-dock-with-gsm-shielding

But what I want is a 3GS-compatible/GSM-shielded speaker system that also doesn't require me to take my protective case off my iPhone each time I want to use it. (I'm using a black incase model).

Does any such beast exist, and would you please tell me which model(s)?

 

[octelcogopod]

Get some speakers you like and shield the cables with ferrite beads
-or-
Put a patch of tinfoil on your phone as explained here (apparently this doesn't affect the signal quality/reception at all!)