6 speakers on a 4 channel amp question....

[volcanicxb]

I have a question that I hope someone can help with. This is my first attempt at a build so please excuse any ignorance on my part, I just don't wanna screw this up. I'm planning on installing my system in my xB tomorrow. I have a Dual XHD7714 that was given to me (I know it's not the greatest HU but it does have Bluetooth streaming which I really want) plus some old school Pioneer IMPP 10 blue cones (4 ohms I'm told) in truck boxes so I purchased the following things to build it with:

Kenwood KAC7005PS 5 channel amp: Specs...

4 Ohms: 40 Watts X 4 Chan. + 300 Watts X 1 Chan.

2 Ohms: 50 Watts X 4 Chan. + 500 Watts X 1 Chan.

Pulse Width Modulated MOSFET Power Supply

Variable Bass Boost (0 To +18 DB Bass Boost At 50 Hz)

Technical Details

Signal-To-Noise Ratio: 80 dB

Continuous Power / Channel Qty: 40 Watts x 4 + 300 Watts x 1

Input Signal Voltage: 0.2 - 5V

Crossover: Active crossover

Low Pass Frequencies: 50 - 200 Hz

High Pass Frequencies: 50 - 200 Hz

Bass Boost Frequency: 40 Hz

Bass Boost Gain: 0 to +18dB

Amplifier Output Details: 40 Watt - 4 Ohm - 20 - 20000 Hz - THD 0.1% - 14.4V DC - 4 channel(s) ¦ 300 Watt - 4 Ohm - 20 - 20000 Hz - THD 0.5% - 14.4V DC - 1 channel(s) ¦ 50 Watt - 2 Ohm - at 1 kHz - THD 0.5% - 14.4V DC - 4 channel(s) ¦ 500 Watt - 2 Ohm - at 100 Hz - THD 0.5% - 14.4V DC - 1 channel(s)

Speakers:

Rear: Polk Audio DB521

Total Frequency Response 60Hz-22kHz

Nominal Impedance 4 ohms

Efficiency 93 dB

Power Handling

Continuous 45 watts

Peak 135 watts

Front doors: Polk Audio DB651

Total Frequency Response 35Hz-22kHz

Nominal Impedance 4 ohms

Efficiency 92 dB

Power Handling

Continuous 60 watts

Peak 180 watts

Dash: Kicker 11ds40

frequency response: 60-20kHz

max. recommended amplifier power (Peak): 50Watts

max. recommended amplifier power (RMS): 25Watts

So my question is this.... how do I run the dash speakers without frying them? I shoulda just got components, but it's too late to turn back now. My understanding is that they can be run in parallel at 2 ohms.... but will they get too much power from the amp? I've heard about using a resistor, but is it really necessary? If it's a big problem I'll just run without them. Thanks in advance!

And the subs are probably gonna come out of those boxes... I just wanna hear what they sound like. Thinking of just running one in an underseat enclosure.

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[volcanicxb]

Could I run the dash speakers from the head unit? Head unit is 17 watts per channel RMS so that wouldn't overpower them. I know I'd lose fading ability... but I never use that anyways.

 

[CrossoverOre 10+ year member]

you could run the dash off the deck but I might run the rear speakers off the deck and do the dash and front off the amp. this way more of your powerful sound is coming from the front. also the 4's in the dash will be able to be tuned better off the amp as opposed to off the deck where you are pretty much stuck with what you can do from the deck. and when you play with the xover points off the deck that is outputed to all speakers. so if you have the 4's off the deck and xover the deck output say 200hz now all of your speakers are xover at 200.

 

[ciaonzo 5,000+ posts]

Bro, you posted specs for a 5 channel amp.

Anyway, I would run the front door speakers and the subs. Turn the amp into a 3 channel, bridge the four channels into two, run the subs off the sub channel.

OR,

Run the dash and the doors off the four cahnnels, run the sub off the sub channel.

Don't really need rears, you'll already have highs coming from god damn everywhere.