There is not much upgrading in the plans. Plus I'm more into SQ over SPL. I run the older JBL stuff for that reason, the Pro Power gerneration of the GTi subs were desighned to be a competition grade SQ woofer.
Ever heard a DD9500 in a propper enclosure?
I'm not downing your stuff. I know the GTi series well. You have a good SQ setup going on there. What's going on with your mids and highs?
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4