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Old 16th June 2005, 01:13 AM   #1
UNCFMM is offline UNCFMM  United States
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Default Need help choosing subs & amps from the experts

Okay, I've been intent on putting a system in my car since I got my Jeep back in March but to be honest I really don't know THAT much about the various systems... I've pretty much narrowed it down to two different options. If someone who knows plenty about car audio could help me decide which choice would be the best way out I would be very thankful.


My car is as follows:
- White 1996 Jeep Grand Cherokee Limited with factory Infinity Gold speakers and standard deck.


Ok, here's the first setup:

- Dual 12" Infinity 1230W peak, 300W RMS subwoofers (On sale $53.99 a piece at Circuit City)
Full Description Here


- Q-Logic standard dual 12" subwoofer enclosure ($89.99 at Best Buy)
Full Description Here

- 980W max PowerAcoustik MOSFET amp, 220W continuous 2 x 4ohms ($199 at Best Buy)
Full Description Here

Total Cost: $397.97 + Installation


The Second Option:

- Loaded MTX enclosure with dual MTX Road Thunder 12" subwoofers 400W continuous & 800W peak power, and a MTX standard dual 12" enclosure. ($129.99 at www.CarDomain.com -has anyone ever ordered from there?-)
Full Description Here

- PowerAcoustik 2-channel 1920W amp MOSFET, crossover, 2ohm stable, bridgeable, HPF/LPF, bass booster. ($184.95 @ www.CarDomain.com)
Full Description Here

Total Cost: $356.85 (this includes shipping) + installation
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Old 16th June 2005, 06:23 AM   #2
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I'd go with your first setup. It will hit harder and probably sound alot better while doing it. I have 3 1230W's in a sealed enclosure and love the way they sound. Quick enough to not disturb the busiest bass lines and can really pump out the volume when I feel like it. Quick is the word, probably the best sub for the money. Everytime I hear the MTX road thunders I'm pretty let down. Just doesnt sound that good. And dont forget that the speakers in your second system arent 400W continuous & 800W peak power each but thats the total(200W RMS each).Wasnt sure if you knew but that amp looks like overkill for a 400W system. How about using the amp from the second system for the first system?
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Old 16th June 2005, 12:35 PM   #3
michal is offline michal  Canada
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Get a class D mono amplifier: it's more efficient (less current drawn for the same output). Features to look for: 2 ohms stable, variable low pass filter, subsonic filter, phase switch. RMS of the amp @ 2 ohms shoud be approx or little more than the sum of sub's RMS. To obtain 2 ohm impedance from two 4 ohm subwoofers, connect them in parallel
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Old 21st June 2005, 02:34 AM   #4
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Yo if you purchase the infinity subs hit me up and tell me how they hit in the jeep. I was thinking about getting some.
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Old 21st June 2005, 02:42 AM   #5
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i'd reccomend the rockford fosgate amp that best buy has....I bought a mono 300 watt rms amp and it hits my subs like no tommorow..i am running 2 dual voice coil audiobahn 12's ...look for an amp that is cea 2006 compliant..these will give you "true" power
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Old 21st June 2005, 05:18 AM   #6
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I recommend 4 guage power wire for this.
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Old 11th May 2006, 09:38 AM   #7
beppe61 is offline beppe61  Italy
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Quote:

Originally posted by montecarlossfan

... look for an amp that is cea 2006 compliant..these will give you "true" power
Dear Sir,

please excuse me if I disturb you.
Could you kindly explain to me what does "cea 2006 compliant" mean?

Thank you very much indeed.
Kind regards,

beppe
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Old 11th May 2006, 10:24 AM   #8
Did it Himself
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CEA 2006 is an industry standard way of stating/measuring power ratings.
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Old 11th May 2006, 10:48 AM   #9
beppe61 is offline beppe61  Italy
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Quote:

Originally posted by richie00boy

CEA 2006 is an industry standard way of stating/measuring power ratings.
Thank you very much Sir.
I understand it is only related to car audio amps.
I see that it should be the continuous power output in Watts RMS measured with the amp powered from a 14.4V supply.
What I cannot understand is the following.
If an amp is able to deliver let's say 10 A RMS on a 4 ohm resistive load it should be able to source to deliver at least the same amount of amperes (10) also on a 2 ohm load.
Am I wrong ?
This figure of the max peak current is my present and recurring nightmare.
It seems something like a secret.

Thank you very much.
Kind regards,

beppe
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Old 11th May 2006, 12:56 PM   #10
Did it Himself
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Yes if it can do 10A with 4R load then it will be able to do the same current with heavier load. But bear in mind that keeping current the same and halving load impedance means that the output power is also halved, just that the required voltage swing is reduced to 0.707x that of the lighter load.

So if voltage swing is to be maintained the supply must be capable of supplying double the current when confronted with half the load impedance. If it can do this then the output power will also double.

Also to take into account is to what extent can big load increases can be tolerated and how long the power supply can sustain increased demands, which is what your proposed peak current capacity is all about. But it can be misleading as a big peak capacity does not guarantee a decent steady-state capacity.
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