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Message: <blockquote data-quote="bigblocktowncar" data-source="post: 7011237" data-attributes="member: 626237">I need some help on setting up my stereo.  It's a 1978 Lincoln Continental.  The original 8-track was removed by the previous owner and he had installed a tape deck that was compatible with common ground wiring.  I rewired the audio system and installed an Alpine CDA-9856 for my headunit.The front door speakers are 6.5" Infinity Reference series with the rotating tweeter.Amplifier is a Profile AP-600 that I had powering a pair of Infinity Reference 6x9s in a 1976 Buick Electra.  They sounded very good in that car, and that audio is my benchmark for my Lincoln.  I would like it to sound even better since the car is nicer.The Lincoln had mounts in the rear for 5x7 speakers.  I was not happy with the sound from the 5x7 speakers (I had Sonys and then tried Infinity Kappas) and wanted more bass like I had in the above mentioned Buick.  I bought some adapter brackets that will allow you to install a 6x9 speaker in a 5x7 location (not sure about these really).  I bought some Polk DB series 6x9s that sounded like crap, so I returned them and again went with Infinity speakers.I was hoping I could get some suggestions on what to do.  I would like some more bass, but the way the trunk is designed, I don't think a subwoofer would sound very good as there is a lot of metal and a gas tank in between the cabin and where the subwoofer box would sit.  I do not think there is enough room for a free-air subwoofer that hangs from the package tray as the spare tire is in the way and even if I were to move it, I don't think there is enough width for even a small subwoofer.<img src="http://i8.photobucket.com/albums/a20/78_towncar_460/P1010331.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />This is the 5x7 mount with the adapter and the Polks installed.  I returned those as they did not meet my expectations and compared to my Infinity Reference 6x9s that I had installed in my Electra, they could not play at my listening level with the same amount of bass without bad distortion--The Infinity Kappa 6x9s that I had now can play at higher levels with a good amount of bass.  The 24 gallon gas tank sits under that shelf for the spare tire...so I was thinking that putting a box into the trunk might not sound very loud in the cabin...I would rather keep the sound on the inside of the car as much as is possible.<img src="http://i8.photobucket.com/albums/a20/78_towncar_460/P1010330.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />I have mixed feelings about these adapter brackets...The speakers now sit about an inch and a half lower than a 5x7 would and are not sealed.  I plan to seal them as I imagine there is some negative/positive air pressure issues there, especially with the lowend (acoustic short circuit as I have read).I will cut into the package tray and enlarge the openings if I have to...that is if it would make a real noticeable difference, otherwise I will just seal them and see how that sounds.Are Infinity Kappa speakers worth the price? Fry's charges $190 with tax for them (I can get them for $100 less online but I wanted to hear them first.)It was recommended on another forum that I look at Tang Band 6x9 woofers...are those worth it?  I would have 2 of those in the back and then have to buy some sort of component set I guess.</blockquote>

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