Originally Posted by ShermanMR2
Thanks for all the input guys. I guess what I was hoping for is if someone was actually having problems with there system and there was a fix for it. I just can't imagine the system would sound this way and there not be a problem with it. I'm almost wondering if there are a few speakers not firing which are creating holes in the frequency ranges.
Here are some pages from my Lexus 3GS350 Manufacturer's 6 Volume Workshop Manual.
The simplist fix is to bypass the manufacturer's Mark Levinson amplifier under the boot lining, and install a much more powerful aftermarket amplifier.
Remember that loudness is proportional to the Wattage, to the power of three!
Thus, we must increase the Wattage 8 times, just to double the volume!
Hence, we want something many times greater than the OEM's 300 odd Watts.
900 Watts RMS would be good, considering that the 4GS has 835 Watts.
And don't worry about blowing up your speakers!
We will never crank the signal to its maximum.
The powerful amps work by not having to work hard, therefore less distortion.
The big amps work by working effortlessly to produce their power, hence no, or little distortion.
It's like comparing a lazy V8, versus a raucous in-line four working its guts out.
In the world of audio, the max output of the amp must be much higher than the max output of the speakers, so that the amp can work "effortlessly", at a fraction of its max capacity - free from distortion, to produce its power.
Of course, if you do really crank up the volume dial to generate a stronger millivoltage signal from the head unit, you will get more amplification from the amplifier in the boot, that can damage your speakers, but no one cranks the volume dial up to that level.
You could purchase a genuine 2012-19 4GS 835 Watt Mark Levinson amp from Lexus Sewell, but it would probably cost you an arm and a leg, and it will most probably not fit under your 3GS boot.
Best buy an aftermarket amplifier - many makes and models to choose from, but 900 Watts from a reputable manufacturer would be good.
Bolt the new aftermarket amp to the back of the rear seat back rest, in the boot.
You could change the speakers, but much more labor.
If you weren't satisfied with the amp upgrade, then the next step is to change all the speakers, but I'm sure most will be happy with a much more powerful aftermarket amplifier.
The Mark Levinson 300 Watt OEM amplifier under the boot lining is tiny.
Look at these photocopies from my Workshop Manual...
I do notice that you have a 2013 4GS with 835 Watts of power; it should sound wonderful.
Get it checked out.
Bring along your favorite 2-channel stereo CD and 5.1 channel surround DVD with music recorded in genuine Dolby Digital 5.1, and play it back to back, and side to side with another 2013 4GS at the dealership.
Compare your 4GS with the 4GS at the dealership.
If your 2013 4GS has no fault, and you still don't like the sound, then perhaps you are very picky/discerning, and you will need to actually change the speakers first.
The speakers are the weakness in the GS, because Mark Levinson does not really make speakers.
Mark Levinson does not specialize in speakers.
The GS will most probably use a generic brand of speakers.
And if not happy with the aftermarket speakers, then upgrade the 835 Watt 2013 4GS Mark Levinson amplifier.
The head unit of the GS with the digital radio, DVD player etc, normally puts out a very clean signal - just as well, because it isn't really upgradeable, without a lot of aftermarket modifications...