Lexus is 300 rear speaker setup - diyAudio
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Old 24th June 2012, 07:00 PM   #1
ToyPick is offline ToyPick  Canada
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Default Lexus is 300 rear speaker setup

Hi guys, quick question, any input appreciated :

My lexus is 300 has an integrated "amplified speaker setup" its all OEM just bought the vehicule.
The sound is really good in the front of the vehicule but the rear stock 6x9 struggle to satisfy my ear.

After reading and doing some searching on the web seems as though toyota wired 4 wires per speaker, in the sense that the rear 6x9's have a separate signal for the tweeter part, and a separate one for the "woofer".

I ordered a pair of Kenwood 4way speakers the headache is that it has one input, how would I go about getting something reasonable with this wiring setup?

Thanks.
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Old 24th June 2012, 07:04 PM   #2
ToyPick is offline ToyPick  Canada
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I don't know if you guys can see this link but here is what it looks like
http://i83.photobucket.com/albums/j3.../antons016.jpg

You can see the two separate wires coming out of each speaker, I was thinking maybe actually hacking the new 6x9's I got used off ebay as to where I would manually separate the tweeters from the woofer by making them two separate circuits... any input on that?
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Old 24th June 2012, 08:09 PM   #3
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WOW! Those things look like they would sound horrible. Lol. Yes separating the wires running to the woofer and the tweets on the new 6x9s would be preferable. If you don't then the factory amp would be putting out low frequency to the tweets and if hooked up to the high outputs on the factory amp then you will be suffering in the woofer section as the amp will cut all low frequencies. Making the woofer like a loudspeaker instead of a woofer. Hope this helps.
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Old 24th June 2012, 08:13 PM   #4
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Usually the the tweeter wires are ran through a hole in the vent pole in the middle of the motor (magnet) of the 6x9. Might be hard to see but it's usually there. Two wires only. A black and a red.
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Old 24th June 2012, 09:47 PM   #5
ToyPick is offline ToyPick  Canada
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Thanks for the help guys ! I picked up some Kenwood KFC-6989ie 4 ways off ebay, can't wait to try them, I hope they'll be a significant improvement.

Ya so basically separating them would mean I cut the wires coming through the woofer, weld them back together so that the woofer is in an individual circuit with the low frequency poles.

And same idea for the tweeters, since its a "3 piece" tweeter, I guess they already have their crossover setup integrated so what would it change if I just put ALL 4 wires on the Kenwood speakers (2 x + and 2 x -) wouldn't all the sounds come through and the kenwood's setup would separate the sounds on its own as it would on a regular setup?
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Old 24th June 2012, 10:44 PM   #6
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The Toyota amp has two sets of wires. One for highs a + and a -. And one for the lows a + and a -. So coming from the amp you have four wires per side. Your trying to split the speaker into a high input +- and the other input for lows(woofer) seperate +-. I'm pretty sure the wires for the tweeters do not come through the woofer cone like factory speakers. It easer and cheaper to build them like that. The kenwoods have a set of wires that run right through the middle of the speaker. They come off the single terminal inputs on the speaker and go down the side of the magnet and under the sticker on the back of the magnet and through a pole that holds the tweeters in place. Cut the tweeter wires from the input terminal. Splice them and hook them up. Keep the woofer inputs in the same place. Don't touch them. That should be all you have to do.
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Old 24th June 2012, 10:47 PM   #7
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The factory amp will most likely not like you hooking the wires together for the speaker to seperate the sound on its own.
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Old 25th June 2012, 04:08 AM   #8
ToyPick is offline ToyPick  Canada
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Wow thanks man, its a lot of fun to get to hear from guys like you who see clearly in situations where a little DIY comes into play... it seems as though in daily life we're surrounded with two types of people : Those who don't dare to adapt or modify anything, and those who'll take advantage of your situation to sell you something magic that will solve all your problems...

Thanks again man! I'll be doing that for sure, and keeping the terminals make a lot of sense might actually look like a clean job. The only thing that seems to be of worry is that the "shape" of this aftermarket 6x9 might not align with the factory holes, in which case I'll try to set something up to keep good air tight for the infinite baffle in the trunk.

If this mod didn't work I was going to say I'll just mount the 6x9's anyway into the high input, and get two small 8 inch subs wired to the low inputs in the trunk.. might also be a good plan?
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Old 25th June 2012, 04:10 AM   #9
ToyPick is offline ToyPick  Canada
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By the way, the stock impedance says that the woofer is 4ohm and the tweeter is 2ohm, by separating the kenwood if ever my impedance goes up a bit (If the total impedance of the wired speaker is 4ohm if I separate them can I assume i'Ll be having two 8ohms since they're probably in parallel?) what "problem" can I run into?

Keeping in mind that I rarely go into the high volumes which would eliminate premature failure of the amp in my opinion.

Right now the current setup if you FADE 100% REAR, and compare with front it feels as though the rear speakers play 20% lower than the front kit.
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Old 4th July 2012, 06:50 AM   #10
ToyPick is offline ToyPick  Canada
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Received the speakers this afternoon, the mod will be easy to do when I get around to it, but what will be the resulting impedance on the TWEETER and on the separate sub?
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