![]() ![]() so I have some extra space for more sub box volume. After building the sub box I realized I could build an amp rack and stack the amps. My first design was to place the MS-8 on one side and the JL Audio amp on the other, so I could only make the sub box a certain width. I will also probably end up enlarging the sub box a bit to get a little better extension. and I am not sure a 3db increase in SPL by doubling the sub drivers will make that much difference either, but I will see what it does and go from there. It probably won't be all that noticeable. My thinking is I will have a little more volume per sub in this box, so it should extend a little lower in the frequency range. although I am not sure how much polyfill I had in it. 31ft³ box gross volume (.23ft³ net) and stuffed with polyfill. The dual sub setup is going to be very limited in box volume, yet the single sub I had in the 07 ST sounded pretty good in a. There might be a slightly higher increase since the box is a tad smaller than. 620 (estimating about a 30% increase in volume). If my calculations are right with polyfill: it is really coming down to what to get for the front speakers and trying to fit the tweeters in the factory location. ![]() I could also take out the Massive CK6 mid-bass drivers in the 07 ST and stick something cheap in there since those are now powered by the head unit. That opens up the options to use some of the DIY home speakers for the mid-bass in the doors. and find a suitable mid-bass driver with a lower Fs and Qts. There is also the option to just purchase the JL Audio tweeters. I would think the C5-570 or C5-650 would be improved. I would think JL has come a ways with their speakers in nearly 10 years. I may be a bit spoiled with the mid-bass of the Massive CK6 speakers I have in the ST. I remember using the JL Audio XR570CSi model way back in my 03 F150 Supercrew and I know I liked the highs, but it seems I remember the mid-bass being a tad on the shy side. The only issue at this point is the mid-bass of the C5 series. I got it from Harman Audio (remanufactured). The JBL MS-8 OEM integration processor is on its way. and I want to try something different in the Platinum. I left Massive CK6 components in the ST because of the modification I had to do to install them. From that system I have a JL Audio HD900/5 amp and one Sundown SD-2 10 D4 subwoofer, of which I have ordered another to have dual 10's. I haven't long installed a system in my 07 Explorer Sport Trac, which I will be selling before too much longer. Dual Sundown Audio SD-2 10" D4 Subwoofers (Custom Box).JL Audio HD900/5 Amp (Active on Fronts).as well as take the factory sub out and install dual 10's. I will keep the factory head unit and replace the front speakers. I have a 2010 F-150 Platinum Supercrew with the Sony system, Nav and SYNC. ![]() I guess is makes me feel younger piddlin' around with it. You would think at 50 years old I would grow out of the DIY car audio installs and either be happy with the factory system or at least let a car audio shop do it for me. ![]()
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