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Discussion Starter #1
I have a 2003 FX45 with the BOSE stereo system. I have gathered the following information but it conflicts with what a couple of people have said.

Front dash left/right - 3.5 inch
Front dash center - 3.5 inch
Front door left/right - 6.5 inch
Rear door left/right - 6.5 inch
Rear pillars left/right - 4 inch
Subwoofer(s) - custom Bose box with dual 6 inch subs
Amp 1 (for all but subs)
Amp 2 (for subs)

QUESTIONS:

1. Is this information accurate? What about the center channel size?
2. What ohm rating are the speakers?
3. How much power (at how many ohms) is the factory amp putting out? I'm asking about both amps.
4. What kind of signal is being sent to the amps from the factory stereo? Will I require replacement amps with high level inputs or will RCA inputs work?
5. Does the factory stereo crossover the preamp signal for each of the speakers already, or is everything full-range until it gets to the amp?

I know this is a lot of information I'm requesting. I apologize if it's been covered elsewhere but I've really looked and looked and can't find any threads with definitive answers. Once this information is acquired, I'll be changing out all my speakers and the two amplifiers (unless the factory 'Amp 1' is fine for aftermarket speakers). I will take many pictures all along the way and create a detailed write up of the work for all my fellow infinitifx members.
 

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Many simply change the speakers and get better sound. Speakers are 2 ohm, so try and find the same if you are just gonna replace the speakers. No real measurements on power of the oem amps. The factory radio sends out a LOW level signal, and it is NOT crossed over- it is full range. The amps handle the xover duties. People seem to think they need a Cleansweep or some other kind of interface but its not necessary. Its just a simple 4 channel low level audio.
 

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chemao said:
Front dash left/right - 4 inch
Front dash center - unknown
Front door left/right - 6.5 inch
Rear door left/right - 6.5 inch
Rear pillars left/right - 4 inch
Subwoofer(s) - custom Bose box with dual 6 inch subs
I'm pretty sure the fronts are all 3.5"... doors are 6.5"... rear pillars were small... I think 2.5" if I remember correctly... and the subs were I think 5.5"... definitely less than 6"... all 3 in the front are the same but cause they're 2 ohm, many have left the OEM center alone or taken it out entirely... replacing it with the same speakers for the front left & right dash made it WAY too center heavy... at least that's what I've read so far... there have already been some suggestions on replacement speakers... do a search for an OLD ironchef thread where he talks about replacing his speakers...
 

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Discussion Starter #5
Well I'm pissed. I have two sets of 4 inch polk audio coaxial speakers that I wanted to put into this SUV, but come to find out the front speakers are all 3 inch. I'm looking at some of the other install threads to decide if I decide to go all out with the install. I just don't trust some noname 2 ohm speakers, and so far I haven't found any amplifiers that could be a direct replacement for the factory amps. If anyone has any input please feel free to drop a line.
 

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did you look at the thread Steve linked above? Good info in that thread that would have helped before you went out and bought those 4s. And there are MANY speaker upgrade threads with other replacements people have used. Search thru the AV forum.
 

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Yep. The thread I linked above showed that Boston Acoustics S35 speakers (3-1/2 in, 87mm) were used in the front dash.
 

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Discussion Starter #8
GixxerSteve said:
Yep. The thread I linked above showed that Boston Acoustics S35 speakers (3-1/2 in, 87mm) were used in the front dash.
Indeed, I will likely purchase said speakers. I'm curious however, if the factory amplifier will have enough power to properly push those speakers to shine. Do you have any input or experience in this? Also, if you believe a replacement amplifier would be helpful, what do you suggest? I'd prefer to avoid rewiring everything if possible. I also intend to retain the factory head unit for the stealth and function. I would not be opposed to replacing it with a head unit from one of the 2005+ cars however. It is my understanding that in doing this, I may enjoy the ability to play MP3 music directly from CDs.

Justin Chandler
 

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If you dont want to rewire things, then stick with the oem amps. Its not a simple swap to put aftermarket amps in. The new speakers will sound much better than stock.

You can't just change to a 2006-2008 head unit. Theres more to it than that. Least of which is trying to retrofit the newer control bezel, which would mean some custom dash modification.
 

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Discussion Starter #10
johnmax said:
did you look at the thread Steve linked above? Good info in that thread that would have helped before you went out and bought those 4s. And there are MANY speaker upgrade threads with other replacements people have used. Search thru the AV forum.
Thank you Johnmax, you are correct in that there is some excellent information in that thread. Actually, I had purchased these speakers several years ago and intended to use them in another car. I hadn't the time to complete the install and ended up selling the car and moving to Boston for work [hence the need for an SUV]. So luckily I didn't just buy them and come to find I can't use them - but on the other side of the coin if I had, I could surely return them and get something else. ARGH now I've got a headache!
 

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Discussion Starter #11
Okay, I've dragged my feet on this project for far too long; I'm ordering speakers TODAY! Anyone that has suggestions on good speakers (preferably from personal experience), please post your suggestions here. I will be making the orders today at 5:00pm EST. Hopefully they will arrive by next weekend and we can get this party started. Also, I think someone may have mentioned it elsewhere but who knows what kind of output comes from the stereo head unit? I'm guessing it's all pre-out but if that's the case, are there RCA connections? How many? Does anyone know ANYTHING about how the stereo outputs signal?

Justin Chandler
 

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Chemao - Refer to my signature for speakers used. Installed instrument panel left and right and unchanged for the center speaker. 2-ways in the door per image below. Overall sounded better for sure. YMMV. Later, newer models are currently available for both. No low level inputs or amps accessed / added, no wiring changed.

I'm sure I've posted the front installation before in various discussions. Try here for most of that.
viewtopic.php?f=5&t=6726&p=75747&hilit=infinity+3012cf#p75747

You can use a fan connector available from an electronics store to connect the speakers to the car wiring harness connectors if you don't happen to locate the Metra or equivalent connectors down at your local auto sound store. Have fun.
 

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Discussion Starter #13
That's great, thank you. I have a question though; you show some fabricated speaker adapters. What did you make them out of? I'm not sure I can manage that on my own. Do you know anywhere that might sell pre-fabbed mounts?

I have speakers on the way; I'll update when I get a chance. I'm still trying to figure out how the **** I want to install a carputer. I am searching high and low for a way to completely delete the monochrome display, including for the AC controls. There must be a way.

Justin
 

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They are MDF. While available from many sources, try a search on 'zenclosures' here for plenty of discussion about that topic if you don't want to fab them yourself. By buying them you'll save time for sure over making them.
 

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I won't address the monitor issue which has been pretty well worked over on multiple forums, but, kind of an important question ... how will you turn on your air conditioner if you ditch its controls? Sounds like we need a new thread here -- doesn't seem to be so much about speakers any longer?
 

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Discussion Starter #16
VitesseFX said:
I won't address the monitor issue which has been pretty well worked over on multiple forums, but, kind of an important question ... how will you turn on your air conditioner if you ditch its controls? Sounds like we need a new thread here -- doesn't seem to be so much about speakers any longer?
I've read a great deal of information and reviewed many carputer installs on the FX, M, and G series, but so far I haven't seen anything that describes how I can completely eliminate the need for the OEM monochrome display. I'll try to search more, as you say it has been covered.

I will not be removing the AC controls, or even the factory head unit. I just want to replace the OEM display with a xenarc 7 inch touch screen. I'll connect it to a custom carputer, but I was hoping that instead of just relocating the factory display, there was some way to have the input to that unit converted in some way so I can connect it to the new touch panel, color display. Even if it just displays in mono, I can switch between the carputer and factory stuff due to the xenarc touch panel having 2 video input sources.

Thanks a million for your help. If you're ever in Boston let me know; dinner's on me!
 

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Discussion Starter #17
Okay, I've so far replaced all of the front dash. I replaced them with 3 inch Infinity coaxials. They sound incredibly clear compared to the factory speakers but due to the limited power going to them, they're now a bit overwhelmed by the rest of the cab. They need 25W RMS and 75W peak. I had hoped the factory amp would be close to that but clearly that's not the case. Once the remaining speakers are also replaced, I might be able to turn the volume up higher and give them more power. Right now turning up the volume for the fronts to sound clean really distorts the other speakers. I'll post again when the next step (the 6's) is complete.

Justin Chandler
 

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chemao said:
Okay, I've so far replaced all of the front dash. I replaced them with 3 inch Infinity coaxials. They sound incredibly clear compared to the factory speakers but due to the limited power going to them, they're now a bit overwhelmed by the rest of the cab. They need 25W RMS and 75W peak. I had hoped the factory amp would be close to that but clearly that's not the case. Once the remaining speakers are also replaced, I might be able to turn the volume up higher and give them more power. Right now turning up the volume for the fronts to sound clean really distorts the other speakers. I'll post again when the next step (the 6's) is complete.

Justin Chandler

Use the FADE control on the head unit to reduce the output from the rear speakers (fade to front), then you can bring up the overall level, that will drive the front speakers a little harder.
 

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Discussion Starter #19
thebeezer said:
Use the FADE control on the head unit to reduce the output from the rear speakers (fade to front), then you can bring up the overall level, that will drive the front speakers a little harder.
Yes, I did try and this helps a little, but the door speakers distort when i turn it up enough for the new speakers to sound reasonable. Frankly, I just need to swap the amplifier. The factory amp simply does not have enough power to push those speakers. Keep in mind, the new speakers are 4 ohm speakers, and the OEM speakers are 2 ohm, so the new ones are getting only half the power from the amp. So they require more power than stock, but they're getting even less than stock.
 

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Correct. You replaced with a lower impedance, which the stock amp provides even less power to. Put a nice amp on them and it'll sound good.

Some have replaced with 2 ohm aftermarket ones (infinity for example) and have reported a huge increase without the need to repower.
 
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