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mr patrick ihave an pair of sda 2 : one tweeter,two woofer ,and an passive radiator . what kind less expensive upgrade is available for it / my sda its not impress-me for really . there is any tweeter for better improvement , mr patrick itry to get some info but icant find nothing for my utilization , perhaps news cables . thanks in advance best regards . paulo wilson . my sda2 is underated ?i saw some people talk about two tweeter 4 woofeer etc . long ago iwas able to find out a lot more info about upgrades .