i've got a 2004 moomba mobius LSV and it came w/ tower speakers, the speakers they use are the Mako's that come with the mb quart speakers, my question is, is there anyway to change out the speakers w/ some really sweet ones that are better rated and keep the enclosure?
Do a serious upgrade and step up to the RCE216's, I have the RKC116's and these things are super loud, crisp and clean... the RCE's are an upgrade from the RKC's (which are no longer available). The Discuss and the Reference series use different size grills (the ref's are bigger) so if they are flush now with the Discus they won't be with the Ref's.
If you wanted to go all out, then I would try the Image Dynamics Chameleon Separates. Their 6 1/2 inch CSX64 can have the tweeters mounting in the center just like the MB Quart. I think you can use your MB Quart grills. These component speakers handle 150 watts RMS all day long and put out 91dB sensitivity from 45Hz to 25kHz.
These speakers sell for about $350 a pair and are similar in sound quality to the the MB Quart Q Series QSD-216 that sells for around a $650 pair.
We have two sets of the CSX64 in our boat and two sets on the tower along with an IDMAX sub and over 3,000 watts of Kicker amps on our Wakeside Demo boat.
We plan on offering the Image Dynamics components and subs this summer and we wanted to test them on our own boat to prove the concept. They sound incredible! The next step for us is a compression horn (HLCD) with two sets of 8 inch mid bass drivers.
The 6 1/2 inch CDX64's will bolt right into the Mako cans and I'm quite sure that your existing grills will work. $350 a pair is a bit steep and $700 for two sets hurts a bit, but I haven't seen anything that compares with the value for this level of sound quality.