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joedirt54 
Member - Posts: 5
Member spacespace
Joined: September 12, 2006
Location: United States
Posted: September 12, 2006 at 10:51 PM / IP Logged  

I have a nissan sentra(97) that I drive to work and back, it gets great MPG and it just seems like it'll live forever...Anyways, since I drive 50 min one way to work I just picked up a sirius starmate and love it.

The problem now is the factory speakers: they sound like they're playing under water compaired to my klipsch reference/denon HT system.

So, I purchased a MB quart RCE 216 set to fit my stock 6.5" speakers but they are not going in the factory holes without major rework of the door(not going there).  I could, but I'm not.  The stock speakers are just 4" round paper crap on a 6.5 frame.  I was going to bi amp them with the full 45x4 power from my alpine HU.

Now, I just thought I'd buy a set of MB Quart PKC 110 4" speakers and make them work.

My questions are these:  What would be the best way to fit these 4" coaxels in the factory 6.5" holes, and how  do I figure out what's the positive side of the factory speaker harness if nothing's marked(without pulling the HU).  Now that I went with the 4" Quarts I would like to try out the factory wiring and HU power as the speakers are 30-80 W RMS, not the 60 to 180 W of the RCE 216's. I figure I would just run new wire to the crossover and speakers, I just need to know how to find the positive lead on the factory harness to run to the crossover.

Thanks for any help you might offer,

Dirt

forbidden 
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Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: November 01, 2003
Location: Alberta, Canada
Posted: September 13, 2006 at 1:02 AM / IP Logged  

Make a mounting adaptor template out of cardboard if you have it. Trace the factory speaker onto the carboard and center a cutout hole into it for the 4" MB Quart. After you have a cardboard template made, go to a plastics supply store and get some 1/4" black abs and trace the template onto it. Cut it out with a jig saw. Done like dinner.

Now for dessert. Take out one of the factory speakers, make a note of what wire is connected to what terminal. Some speakers are marked on the back for polarity, look closely. If they are not marked, find yourself a AA or AAA battery and some speaker wire. Attach the wire to the battery terminals and tape it on. Touch the other end of the wire to the disconnected speaker. DO NOT HOLD THE WIRE TO THE TERMINALS. Watch the cone of the speaker, if it moves in, then the + on the battery is connected to the - of the speaker. If the cone moves out, + on the battery is connected to the + of the speaker.

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KarTuneMan 
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Joined: December 14, 2004
Location: Isle Of Man
Posted: September 13, 2006 at 1:23 AM / IP Logged  
Done like dinner......I like it!     Done like a microwaved TV dinner.
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: September 13, 2006 at 10:32 AM / IP Logged  
Or you could do what I would do: put the 4" speakers back into their box and save them for a later install and get a set of 6.5" designed to fit your factory openings.
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DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: September 13, 2006 at 10:33 AM / IP Logged  

joedirt54 wrote:
 I was going to bi amp them with the full 45x4 power from my alpine HU

What exactly do you mean by this statement?

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xtremej 
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Joined: February 24, 2006
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Posted: September 13, 2006 at 10:51 AM / IP Logged  
I can't speak for mr dirt but I have recently been hearing this term a lot in my area. I found out the defintion yesterday when a customer arrived from another install shop, by his defintion they "bridge the h.u. to 2 channels to give it way more power" I believe this falls in the bad advice monster column.....
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: September 13, 2006 at 11:00 AM / IP Logged  

xtremej wrote:
I can't speak for mr dirt but I have recently been hearing this term a lot in my area. I found out the defintion yesterday when a customer arrived from another install shop, by his defintion they "bridge the h.u. to 2 channels to give it way more power" I believe this falls in the bad advice monster column.....

That's what I feared.  Bad advice unless you want to buy a new HU soon.

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joedirt54 
Member - Posts: 5
Member spacespace
Joined: September 12, 2006
Location: United States
Posted: September 13, 2006 at 11:12 AM / IP Logged  

Thanks for the help.

By bi- amping I mean using both Front and back speaker leads to run just the door speakers...MB Quarts crossover has line level inputs for both the tweeter and the mid(they are bridged from the factory, but you can remove it).  You can do this if you have two of the same amps, or in my case the two amps would be the fr/back speaker leads from my HU.

Jeremy, it's not like bridging my HU...That would not be a good idea,IMHO.

DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: September 13, 2006 at 11:20 AM / IP Logged  
joedirt54 wrote:

Thanks for the help.

By bi- amping I mean using both Front and back speaker leads to run just the door speakers...MB Quarts crossover has line level inputs for both the tweeter and the mid(they are bridged from the factory, but you can remove it).  You can do this if you have two of the same amps, or in my case the two amps would be the fr/back speaker leads from my HU.

Jeremy, it's not like bridging my HU...That would not be a good idea,IMHO.

THAT approach is certainly do-able.  You will then use the fade control to achieve ballance between the woofer and tweeter.  Do you have an SPL meter or access to an RTA?  You must be careful when bi-amping any system to not over-power the tweeter, but since you are using the supplied passive crossovers this is much less a concern.  Go for it!  But I still recommend looking for a set of 6.5" speakers...

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xtremej 
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Joined: February 24, 2006
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Posted: September 13, 2006 at 11:34 AM / IP Logged  

I am glad your not trying that method, although it has increased h.u. unit sales........

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