The SI HT18 bundle comes to $325 right? From HT18 to UM18 in a sealed box will be very similar, in a vented the UM18 can take more power and thus more output. Also the PE cabinet is supplied by DIYSG and is the same flatpack so the differences are really only in the driver. Can't really go wrong with either.Thanks, is there any reason I wouldn't be buying the kit from PE? $355 for the Ultimax bundle, vs $305 for HT18 ($160, looks like that includes shipping?) and DIYSoundgroup flatpack ($120 + 45 shipping).
Also, am I crazy or does data-bass show the HT18 doing better than the Ultimax?