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Carv
Dodge Dakota
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8/31/2004
23:35:00
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 Subject: How to correctly amplify
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Hello all,
I have a 2000 QC that had the Infinity upgrade but i replaced the HU and Speakers last week. The Next step will be to add an Amplifier and possibly a sub too but I am a little confused. I have read through the forum and have not yet seen a solution and need you help.
My HU puts out 22Wx4RMS
Front Composite speakers: Infinity 6000CS handle 90W RMS
Rear coax: Infinity 6002i handle 60W RMS
I realize that the HU does not provide adequate power but what should the amps power rating be to handle four speakers with different RMS wattage specs? Should just try to amplify to 60 Watts per channel or somewhere between 60 and 90?
I think I read somewhere that some only amplify the front speakers and a sub, is that a viable alternative?
Also, any sub suggestions that would be adequate for someone trying to save money and whom does not need an ass-kicking system but a good sounding one?
Thank You
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Paul
Dodge Dakota
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9/02/2004
02:45:20
|  RE: How to correctly amplify
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You should look for a four channel amp that has at least 90w RMS per channel (more would be better (125 maybe)), then you turn down the gain on the rears (and the fronts if you get an amp with more watts). Don't use a sub channel to power your front or rears.
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DSW
Dodge Dakota
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9/03/2004
17:02:13
| RE: How to correctly amplify
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Carv, I have a Orion 55Wx4 amp running 2 sets of Infinity 605CS components (90W rms) along with a RF 301S 300W amp running 2 RF XLC 10" subs. The Orion does a fine job balancing the system out against the RF sub amp.
The system is right for my liking, loud and clear, but not a ghetto thumper. I could have gone with a larger 4 channel amp, but knew that 55W rms was going to be more than I would ever need since my car has a Soundstream 30x4 amp. I have the Orion's gains turned down as I don't need to go more deaf than I already am ;)
Go to some stereo shops, Best Buy, Circuit city and listen to some 4-ch amps. You would be surprised how loud a 50Wx4 amp is running mids and tweets.
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Carv
Dodge Dakota
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9/07/2004
09:48:56
|  RE: How to correctly amplify
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Thank you Paul and DSW,
Sorry for not getting back to you both earlier but I have been without power for the last few days due to hurricane Frances.
I will try what you both recommended and I did not realize you could turn down the gain on the amps. How do you measure the gain? do you put an inline device to see how many watts are being pumped out of the amp?
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DSW
Dodge Dakota
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9/07/2004
16:38:29
| RE: How to correctly amplify
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The amp's gain adjustments are used to adjust the amp to the deck's line out voltage (2V, 4v, 5v) and keep the amp out of clipping (meltdown). This is normally accomplished by turning the amp gains down to 0, turning the stereo up to 3/4 volume and then turning the amp gains up to "just" before the speakers distort. You could be real scientific and hook up an oscilliscope to the amp's output and adjust the gains until the output signal starts to clip, but who has an O-scope sitting around in the garage?
Since most decks start to distort past 3/4 volume, this puts your stereo and amp in the sweet spot, just don't crank the stereo volume too loud if it sounds like crap. It kind of depends on the music, with my setup I can't go past 3/4 volume listening to metal, but other stuff I can crank up all the way, depends on the recording levels of the music.
I adjusted my sub amp this way, and then adjusted my mid/tweet amp to balance with the sub's. The mid/tweet's were over powering the sub's with the mid/tweet amp turned up too much ;)
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matt
Dodge Dakota
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8/24/2005
20:47:33
| RE: How to correctly amplify
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i have a 2 channel and a four channel amp is there a way i can put them inline to power the sub and internal speakers as well? One amp is a Sony explode 1200 watt and the other is a Crossfire 650 watt. I would like to bring the power to the 12 inch 2000 watt sub by fosgate.
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