Speakers upgrading for F30......

[Satrian3]

Hi guys im driving my f30 320i for the past 2 months and now sudah gatal to upgrade my sound system .....can any one give some input abt the speakers which are availabe in the market with reasonable budget.......wat i heard so far is only GLADEN...and how about HK? any outlet here selling HK speakers? or some other brand which fellow bavarian can help me....i want to change only the speakers and woofer....looking for kinda plug and play......thanks and selamat hari raya........