Originally Posted by chris6878
Anyone know where to find the spec sheet for the 250 non ml system. I want to replace most of the door speakers and i need to know the size of each. Thanks for any help.
take it from someone who has been installing car audio since 1989 i know a lot of people think factory speakers suck. but the fact is the factory speakers in the lexus like most factory speakers in recent years are quite good.
you see most are made with a light weight cones which are more efficient than poly cones used in 90% of aftermarket speakers.
also the factory amplifier uses internal crossovers to match the capability of each of the speakers.
unless you plan to swap out the amplifier and all the speakers i wouldn't waste your money. for far too long in the 12 volt industry people continue to buy into the marketing hype. too many car audio salesmen have become so successful convincing people the factory stuff is garbage so they can push the aftermarket to make a buck.
too many people buy car audio gear with their eyes and not with their ears. I've done RTA's in several cars and found that excluding subwoofers you actually get more volume and better bass response with the factory speakers than with most aftermarket speakers.
those that performed better were minimal at best and not worth the amount of money for the small gains.
you would be far better off doing like several here have done to just add an amp and subwoofer to the system. leave the rest of it alone.
in most cars its not the speakers, it's the lack of power because most manufacturers use an amplifier that does not have a switching power supply in it. therefore the entire output stage has only 12 volts (14.4 with engine running) to work with. you can only get about 40 watts per channel under these conditions.
some manufacturers like Bose will use lower impedance speakers like 2 ohms getting nearly 80 watts from the same amplifier.
therefore if you replaced a speaker like that you would get half the power because all aftermarket speakers are 4 ohms.
i know what your thinking, but if your ear is good enough to detect a well engineered stereo, you'll notice that the non ML system with the surround actually has some great staging, it doesn't have a lot of power but the only thing thats going to help you there is replace the amplifier. the speakers they used and the crossover points they picked were designed to compliment both the interior placement and the amplifier used.
the major reason the industry has brainwashed so many into aftermarket speakers is because it is not very easy to listen to 2 identical cars side by side, 1 with factory and 1 with aftermarket and on the same songs. combine that with the fact a lot of people wouldn't know a good sounding audio system even if it fell out of the sky and landed on there face and started to wiggle!
case in point, last summer i took my corvette Z06 to a local car audio shop after replacing the factory head unit only, still using factory speakers and factory amps. (thousands of people have complained for years about the crappy bose systems in corvettes)
all i did was add a subwoofer and amplifier for the sub to the system.
i had the manager of the shop listen to the car and he was blown away with the staging and overall sound quality. then he asked what i was running and he refused to believe the speakers were stock. 3 other techs listened to it and refused to believe my claim.
why would i lie?
replace them if you want. but i guarantee you it will do more harm than good and the only thing you will have done is spent a lot of money you didn't need to spend.
spend your money on the item in the car thats lacking, thats the subwoofer. it is very difficult if not impossible to get a free air or infinite baffle subwoofer design to reproduce accurate bass using the trunk of the car as the enclosure.
the best way to get that kind of output is with a ported enclosure tuned for that vehicle with an amp,
once you get that done, you can simply turn down the bass control at the head unit with will virtually eliminate any distortion even at high volume for the other speakers in the car, while the sub takes care of the low end response.
you heard it here from the Bass Mechanic!