Originally Posted by buzman

Hello All,

New to the forum but would like to share some information on hooking up a subwoofer and amp in 2011 RX350 while still keeping stock head unit and speakers. I used an adapter from Auto-Zone for the remote turn on for the amp(it cost $5-6). It allowed me to remove the Cigarette lighter fuse and plug a lead into it still utilizing the cigarette lighter but, ALSO supplying a lead wire to attach to. It has 2 fuses on it so they are both protected(15 amps each). I tapped into the subwoofer wires directly from the factory sub(Non-ML). The wires going into the factory sub are Red, blue and 2 whites. Both the red and blue wires are positive "+" while the whites are obviously negatives "-". I did not have to remove seats to get to these wires(where the factory amp is located). They are very easily accessible from the back of the vehicle where the spare tire rests. Just lift up on the handle to the spare and remove the 2 recessed holders(Sub is on left side).
The amp I used is a Rockford-Fosgate which has "High Pass Leads" on it. There was no need to buy an LOC to connect RCAs. I hope this helps out anyone tackling this project.

Originally Posted by Clutchless

Gloomis - FYI - buzman posted 3 times in 2017 and has not been back since then. You should not expect a response from them although someone else may try to help. It appears you already know how to search. You may also want to check out the audio forum. https://www.clublexus.com/forums/lex...lectronics-12/

Originally Posted by Clutchless

It may attract more attention to start a new thread rather than revive an old one in which most of the posters are no longer members.

Originally Posted by salimshah

In pursuit of perfection. So you are trying to improve on the enviable ML system or just modifying to your taste.

If you tap off the rear speakers, the low frequencies [for the additional sub] are already rolled off. I would suggest tap off the installed sub-speaker.

I have not messed with 3rd gen RX audio system, but classically Lexus runs pre-levels in their unique and non-stanrdard way. Share what you find out.

Salim

Originally Posted by Gloomis

Hi,

Well I tapped the rear speakers and the output on the sub is WAY too low being a true 300W RMS amp from Cerwin Vega. I'm am looking for the sub lines but not sure on what harness it's on. I know the colors but there is more than one red and black?

Thank you kindly.