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Bose system removal, wiring help.

Old 09-26-2015, 08:58 PM
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Bose system removal, wiring help.

Hi, so i've spent the last couple of days trying to find answers to my wiring questions and have had no luck. I'm planning on doing a bose removal of the front speakers/amps and the rear bose amp. I have infinity kappas i'm putting in all around, 2 JL 12" subs, and 2 4-channel amps. I also have a kenwood touch screen with the metra kit installed.

Here is my desired speaker setup...
Front door speakers will have adapters made to fit the infinity kappa speakers.
Rear speakers will be the 6x9 infinity speakers
2 Subs in the back.

I already have the subs installed and 1 amp with RCAs from the radio to the amp, but the RCAs are from a subwoofer specific slot on the radio.

The 4-channel amps have wiring as followed

L+, L-, R+, R- (Front)
L+, L-, R+, R- (Rear)
^-------------^ Bridged 500w
Phoenix Gold V754 (pg-v754) 1000W Max, 4-Channel Amplifier (Rival)
What i want to do is use an amp for each sub to minimize heat produced by high work loads.

Here is where i'm stumped, my amps have speaker level input connectors and i'm not sure what they're for. There is one for front and one for back on each amp. There is wiring for left and right speakers and a ground. Do i wire my speaker wires from the radio to the speaker input connectors in the amp, then run power from the amp to the speakers? Or do i make it 1 big cluster of wiring connections to the speaker?

What i was thinking is to cut the wires for the bose amp in the back and use that as my speaker level input wires instead of running them through the entire car. Then for my fronts just run the power from the amp to the speakers and through the door. But this could be totally wrong since i don't know where the tweeters get their power.

Any help is appreciated, please keep all stupid comments to yourself unless you want to fund my project.
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Old 09-27-2015, 08:00 AM
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After spending quite literally 10 seconds with Google, I found your answer:

https://www.rx8club.com/series-i-int...ference-74664/

But why wouldn't you run preamp outs to all of your amps? You will get much cleaner, quieter signals that way. Your chosen amps even have outputs for daisy chaining.

Phoenix Gold amps are garbage.
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Old 09-27-2015, 03:48 PM
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Originally Posted by Steve Dallas View Post
After spending quite literally 10 seconds with Google, I found your answer:

https://www.rx8club.com/series-i-int...ference-74664/

But why wouldn't you run preamp outs to all of your amps? You will get much cleaner, quieter signals that way. Your chosen amps even have outputs for daisy chaining.

Phoenix Gold amps are garbage.
HAHA, keep stupid comments to yourself. What I didn't understand was the preamp outputs, didn't know what they were which is why i asked for help. Also I didn't look at the base stereo speaker replacement in the doors because i didn't know it would be same setup.

So for preamp outputs i just run the RCAs from the head unit to the amp like i would the subs, then just wire from the front/rear accordingly? Do i need to do anything with the speaker level input wires? or are they obsolete since im using the preamp outputs?
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Old 09-27-2015, 04:26 PM
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What exactly are you trying to do? Are you saying you have 2 of those amps and want to use one amp per sub bridged mono to 500W each? How are you planning to run your door and deck speakers? Are you running those off the head unit or off one or both amps somehow?

Since I'm bored and I trashed your [crappy] amps, I am taking the time to read the owner's manual on your amps to see what your options are.

BTW, I had a hard time getting Infinity speakers to fit in my rear decks. The tweeter towers are tall enough, that they touch the grills and prevent the rear panels from seating properly.

BTW2, here is my stereo 'build' thread.
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Old 09-27-2015, 04:37 PM
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OK. That didn't take long. Here is the [crappy] user guide for your [crappy] amps.

That amp runs in either 2 or 4 channel modes. In 2 channel mode, you get 250W RMS per channel at 4 Ohms (2 Ohms is not supported) at 1% THD [which is all crap]. In 4 channel mode, you get 75W RMS per channel at 4 Ohms or 120W RMS at 2 Ohms. There is no 3 channel mode.

That means if you want to use 1 amp per sub, you can only use 1 channel of each amp unless you want to use the remaining channel on each amp for each rear deck speaker, but that would be really weird, and I'm not sure the crossovers would support it.

Assuming your subs are 4 Ohms each and your Inifinities are 2 Ohms each, what I would do is dedicate 1 amp to run the subs in 2 channel mode, and 1 amp to run the decks and doors in 4 channel mode. If you want to lessen the workload on the sub amp a little bit, install a capacitor.

In any case, if you use the preamp outs for everything as you should, you just ignore the speaker inputs on the amps and the speaker outs on the head unit.

.

Last edited by Steve Dallas; 09-27-2015 at 04:54 PM. Reason: Needed more emphasis on crappiness.
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Old 09-27-2015, 06:35 PM
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Originally Posted by Steve Dallas View Post

Assuming your subs are 4 Ohms each and your Inifinities are 2 Ohms each, what I would do is dedicate 1 amp to run the subs in 2 channel mode, and 1 amp to run the decks and doors in 4 channel mode. If you want to lessen the workload on the sub amp a little bit, install a capacitor.

In any case, if you use the preamp outs for everything as you should, you just ignore the speaker inputs on the amps and the speaker outs on the head unit.

.
If you mount the infinity speakers from the bottom instead of dropping them in the top like the factory speakers are they fit perfect. I just used short self-tapping screws to make sure they didn't poke through the rear cover.

Subs are 4 ohm, i believe the infinities are all 2 ohm. I planned on getting a capacitor in a couple months anyways.

So final conclusion, is to wire the 2 subs to the same amp then wire the speakers to their own amp. Giving a bridged 2 channel amp and a 4 channel amp. Then for the input i need to run RCAs from the headunit to the 4 channel amp for front and rear. I have infinity reference crossovers as well, can i use them for the factory bose tweeters or would that make it an odd ohm load that the amp can't handle since the speakers are 2 ohm and the bose tweeters are 4 ohm, or does it even matter. I'm not a guru when it comes to speakers.

I have 4 crossovers from these speakers but not the speakers themselves.
Infinity Crossover

Appreciate the help
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Old 09-27-2015, 06:58 PM
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There was some good reason I didn't bottom mount my Infinities, but I don't remember what it was. I have an S2, and I think there was an odd bump in the sheet metal under there or something. In any case, they didn't sound good in my setup.

Your final conclusion looks to be correct.

You cannot use the Infinity crossover with the Bose speakers and expect good results. IIRC, the Bose tweeters have an 1800Hz passive crossover built in, and Infinity uses something like 3500Hz. So, all of your upper mids will disappear. I take it you don't have the front speakers yet?
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Old 09-27-2015, 07:07 PM
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Okay, so if i get some other tweeters and install them where the bose are, i need to match the ohms with my current speakers, then i can use the crossover since the bose crossovers will be removed with the tweeters?
I have some 4x6 infinity kappas that i have left from my previous car. I was going to make a bracket to be able to mount them in the front door slot. There isn't really anywhere to put them without custom fabricating a cutout in the car so i was going to remove the dead weight in the doors and put those in.
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Old 09-27-2015, 07:38 PM
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Crossovers are matched to specific speakers. Buy the front component set that matches your rears, or prepare for disappointment. Mix and match setups almost never sound good in the end.
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