I Have A 1999 F-150 LARIAT EXTENED CAB. THE AUDIO SYSTEM IS COMPLETELY STOCK AND I WOULD LIKE TO LEAVE IT THAT WAY BUT ADD A AMP+SUB UNDER THE REAR SEAT. I TOOK OUT THE RADIO AND NOTICED THAT THERE WERE NO PRE-AMPS IN THE BACK. IS THERE A WIRING HARNESS I COULD USE TO GET A SET OF PRE-AMPS OR SHOULD I JUST RUN A LINE FROM ONE OF MY REAR SPEAKERS? ALSO IF ANYONE KNOWS OF PLANS TO BUILD THE SUB BOXES FOR A 1999 UNDER THE REAR SEAT COULD YOU PLEASE LET ME KNOW. I SAW THE ONES A MEMBER HAD POSTED FOR A 1997 OR 98...BUT I DON'T KNOW IF 1999 WOULD BE THE SAME PLANS WOULD IT???HELP PLEASE...ALL ANSWERS ARE VALUED.

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1999 Ford F-150 Lariat 4x2 Supercab 4.6L Triton V-8 Auto--Westin Chrome Step Rails, GTS Front/Rear Black-outs, 40 Series Flowmasters, Daul Ehaust Cut-Outs (pre cat's), Bug Deflector, Aeroshades, CB Radio, K&N Open Air Filter And FPTK Kit.
FordRacing99

 

FORD,

The only way I know to do what you want is to tap into your speaker wires with a low level converter that will give you the rca low level outputs you need. Some amps have this converter built right into them.

Only problem doing it this way is that you will never get the sound quailty as you would with pre-amp outputs right from the head unit. Once the signal gets amplified, there is distortion in it. By tapping into your speaker wires you are converting this already amplified signal with distortion back into low level. When you run this to your amp, it gets amplified again, adding even more distortion. This takes away from your sound quality.

Unfortunately, if you want to keep the stock head unit, this is your only choice.

And yes, the plans for 97-98 box are the same for the 99. The rear seat changed a little in 00, but 97-99 are the same.

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Boss™

Ordered June 29th: 2001 F-150 Lariat, Oxford White/Silver 4x4, SC, SB, SS, 99L 5.4L, 44E tran, 7700# payload, Class III Tow, 3.73LS, Skids, Leather Captains, 4W disc ABS, shift-on-fly, keyless, HD everything
Planned Mods:
"Protected by the Owner and his 2 friends, Smith & Wesson" sticker, Westin Chromed Stainless Nerf Bars, ARE LS II bed cover, Bedrug™, Gibson Swept Side Cat Back, K&N filter w/airbox mods, headers, Superchip, 3" body lift with at least 33's, alarm/pager/auto start system, stereo system

 

FordRacing99...you may have read my reply to someone like yourself. I am setup like boss96hog described. Depending on your own tastes that setup is fine for me. The stock H.U. deters stickyfingers from getting too nosey with my stereo system! Anyway, e-mail me @ SideJobBob@aol.com and we can continue fine tuning your truck. I live up the road from you.

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1997 F-150 LARIAT S/C 4x2 Styleside...Pacific Green Exterior/Silver Frost Accent...4.6L Triton (Romeo)...Auto...3.55 Limited Slip...Trailer Tow Pkg...Remote Entry w/ Anti-Theft...Power Everything...

FORD ACCESSORIES Wheel Locks...Molded Vinyl Floor Mats...Sill Plates (Look Great!)...Molded Mud Guards...

AFTERMARKET Deflecto Bedliner...Lund Bug Shield...Ventshield Side Louvers & Taillite Covers...A.R.E. Fibreglass Tonneau Cover...22 Piece Burl Wood Dash Kit...Custom Tweed Hood Insulator Pad...Westin Chrome Step Bars...

PERFORMANCE OPTIONS SVO Lightning Wheels w/ Yokohamo 285/50/18 AVS-ST Tires...Optima Battery...Evergreen F.I.P.G...Superchip YSL2...

STEREO Premium Ford Head Unit...Pac Lineout Convertors...Coustic 3E Crossover...JBL GTQ400 & GTQ200 Amps., Behind Full Functional Backseat...2x JL Audio10W4 Subs ...4 Pioneer 3-Way 6815's In Doors...

WHAT'S NEXT? Powerdyne Supercharger...Cat Back Exhaust...Roush Susp...Ground Effects...???...

 

LOL..........this must be the S. Florida thread!!