question about my HU power rating

Pistons23 · 10-27-2007, 04:24 PM

in my owners manual for my pioneer deh-p3900mp reciever it states:

maximum power output
-50wx4
-50wx2/4ohms+70wx1/2ohms(for a subwoofer)

load impedence
-4ohms to 8ohmsx4
-4ohms to 8ohmsx2+2ohmsx1

i just bought a set of Infinity Kappa 60.7cs.

Speaker Size 6 1/2
Design 2-way
Tweeter Design 1" Dome
Tweeter Composition M.M.D.
Woofer Composition Woven-glass-fiber

Specifications
Sensitivity 95 dB
Frequency Response 45 - 25k Hz
RMS Power Range (Watts) 2-90
Peak Power Handling (Watts) 270
Impedance (Ohms) 2

can i run these off of my receiver until i get an amp(1-2 months from now) without damaging the speakers or reciever? i currently have the balance set all the way to the front so no sound is coming out of the rear speakers behind the seat, since i can barely here them anyway. with the balance set all the way to the front, are my rear speakers still drawing power?

**Tempe** · 10-28-2007, 09:22 PM

Those speakers are 2 ohms, and the receiver is rated for 4 ohms or higher. You risk burning out the "amplifier" in the h/u. Also you are not getting anywhere near 50 watts per channel out of any h/u. Buy the amp right now, or rawk teh stock speakers until you can afford that amp.

T

Pistons23 · 10-28-2007, 09:52 PM

yeah thats what conclusion ive come to. im looking at 2 models:
-Rockford Fosgate Power T4004 $180 shipped
-Rockford Fosgate Punch P450.4 $160 shipped

ive heard the build quality on the power is much better. it also runs about $20 more than the punch. im not sure which one to get. can someone please help me decide. i have the speakers already and im dying to install them. i had a side job today, now i have the money to get the amp now. please help.

**Tempe** · 11-01-2007, 01:51 AM

IIRC power just has better power supply and steeper crossover slope.

nidf88 · 11-02-2007, 12:40 AM

Rockfords are made in AZ by tempe himself.
but seriously, either Rockford will push those easy---one is just prettier with better cooling ability. i hope your going to run a sub too, casue those kappas are REAL bright. play those kappas for about 5 minutes on your 3900 then touch the back of the radio. if you burned your hand then your radio is getting too hot from the 2 ohm load. i would probably use that high pass filter that the 3900 has if your not amping them.

nidf88 · 11-02-2007, 12:44 AM

the 3900 has selectable sub preouts too. just run the back speaker off the radio, fronts on the amp and bridge a 4ohm sub off the rear channels on the amp.

**Tempe** · 11-02-2007, 01:26 AM

Quote:

Originally Posted by nidf88

Rockfords are made in AZ by tempe himself.

I LOLed

Pistons23 · 11-02-2007, 10:25 AM

thanks for all the replys. i just oredered a elemental designs nine.4 amp. since my components are 2ohm, i have to wire them directly to the amp right?

10-27-2007, 04:24 PM	#1
Pistons23 Member Join Date: Sep 2007 Location: Fresno CA Year: 2000 Make: Ford Model: Ranger Engine: 2.5 Posts: 634 Rep Power: 13 iTrader: (0)	question about my HU power rating in my owners manual for my pioneer deh-p3900mp reciever it states: maximum power output -50wx4 -50wx2/4ohms+70wx1/2ohms(for a subwoofer) load impedence -4ohms to 8ohmsx4 -4ohms to 8ohmsx2+2ohmsx1 i just bought a set of Infinity Kappa 60.7cs. Speaker Size 6 1/2 Design 2-way Tweeter Design 1" Dome Tweeter Composition M.M.D. Woofer Composition Woven-glass-fiber Specifications Sensitivity 95 dB Frequency Response 45 - 25k Hz RMS Power Range (Watts) 2-90 Peak Power Handling (Watts) 270 Impedance (Ohms) 2 can i run these off of my receiver until i get an amp(1-2 months from now) without damaging the speakers or reciever? i currently have the balance set all the way to the front so no sound is coming out of the rear speakers behind the seat, since i can barely here them anyway. with the balance set all the way to the front, are my rear speakers still drawing power?
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10-28-2007, 09:22 PM	#2
Tempe RBV Technical Advisor Join Date: Aug 2007 Location: Tempe, AZ Year: 1998 Make: Ford Model: Ranger Posts: 56 Rep Power: 12 iTrader: (0)	Those speakers are 2 ohms, and the receiver is rated for 4 ohms or higher. You risk burning out the "amplifier" in the h/u. Also you are not getting anywhere near 50 watts per channel out of any h/u. Buy the amp right now, or rawk teh stock speakers until you can afford that amp. T __________________ --My 1998 Ford Ranger --Tempe's Car Audio Bible
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11-01-2007, 01:51 AM	#4
Tempe RBV Technical Advisor Join Date: Aug 2007 Location: Tempe, AZ Year: 1998 Make: Ford Model: Ranger Posts: 56 Rep Power: 12 iTrader: (0)	IIRC power just has better power supply and steeper crossover slope. __________________ --My 1998 Ford Ranger --Tempe's Car Audio Bible
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10-28-2007, 09:52 PM	#3
Pistons23 Member Join Date: Sep 2007 Location: Fresno CA Year: 2000 Make: Ford Model: Ranger Engine: 2.5 Posts: 634 Rep Power: 13 iTrader: (0)	yeah thats what conclusion ive come to. im looking at 2 models: -Rockford Fosgate Power T4004 $180 shipped -Rockford Fosgate Punch P450.4 $160 shipped ive heard the build quality on the power is much better. it also runs about $20 more than the punch. im not sure which one to get. can someone please help me decide. i have the speakers already and im dying to install them. i had a side job today, now i have the money to get the amp now. please help.
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11-02-2007, 12:40 AM	#5
nidf88 Junior Member Join Date: Aug 2007 Location: Carrollton. GA Year: 1985 Make: Ford Model: Ranger Engine: 2.8 Class: 4x4 Posts: 64 Rep Power: 12 iTrader: (0)	Rockfords are made in AZ by tempe himself. but seriously, either Rockford will push those easy---one is just prettier with better cooling ability. i hope your going to run a sub too, casue those kappas are REAL bright. play those kappas for about 5 minutes on your 3900 then touch the back of the radio. if you burned your hand then your radio is getting too hot from the 2 ohm load. i would probably use that high pass filter that the 3900 has if your not amping them.
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11-02-2007, 12:44 AM	#6
nidf88 Junior Member Join Date: Aug 2007 Location: Carrollton. GA Year: 1985 Make: Ford Model: Ranger Engine: 2.8 Class: 4x4 Posts: 64 Rep Power: 12 iTrader: (0)	the 3900 has selectable sub preouts too. just run the back speaker off the radio, fronts on the amp and bridge a 4ohm sub off the rear channels on the amp.
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11-02-2007, 10:25 AM	#8
Pistons23 Member Join Date: Sep 2007 Location: Fresno CA Year: 2000 Make: Ford Model: Ranger Engine: 2.5 Posts: 634 Rep Power: 13 iTrader: (0)	thanks for all the replys. i just oredered a elemental designs nine.4 amp. since my components are 2ohm, i have to wire them directly to the amp right?
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