The Sundown Audio SA subs will handle more power than the K5 subs...closer comparison to the K9 subs. The DB Drive subs handle rated power (K5 750rms), but I wouldn't push them above rated power depending on the enclosure. Either way, DB Drive is a great option for their price.
BTW, can you PM me if you can the price you are getting the DB Drive products? I am interested in comparing what you are getting from a friend versus our price...we get a nice discount off dealer on DB Drive.






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