which sub is better out of these ones..?

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hmmm it just keeps getting more and more confusing, at first i always heard 6dbs was twice as loud then 3 then 10 now im gettin 3 and 10 DOES ANYONE KNOW 100% FOR SURE?!?! i want a freakin acoustical mad scientist to tell me

 

for every 3 db increase its double the perceived vol.unless your hearing is ****ed

 

weird...i've heard numerous times that 10db is perceived doubled loudness.

3db is just doubled the acoustic power

 

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my truck with the 10 init would do a 135.8 all day long.

then i heard a system that did a 139 and it was fricking insane how much louder it was.and thats only a 3.2db diff.

140 to 150 is frickin nasty

 

Well pedro "perceived loudness" and "spl readings" are totally different.

The meter only reads pressure on one point of the windshield...perceived loudness is completely different.

Thats why some vehicles with four 18's can meter like a 140 but sound loud as SH!T but a system that meters 150 with a single 10 doesn't sound all that loud.

 

you make a good point.

 

CRUNCH PZI-1000.1 POWER ZONE 1000W MONO AMP PZI1000.1 - eBay (item 120227859580 end time Mar-06-08 14:57:23 PST)
this is cheap and will do what it says

 

you know what..did i ever mention that all my equipment is used.amps/subs only.

my 4 ch is from a pawn shop and my 2ch's and eq came from ebay.
and my subs now i just got for 100 bucks.

look around cause maybe you can find some deals in a pwan shop,but know what to look for.

today i saw a hifonics 10005d for 150.
and a kicker solo 10 in a sealed box for 99.

amp kit 75.and it was a decent one at that.

hell theres your set up for 325.

 

ok so 3 db is double the loudness, so is it also double the power to get a 3 db increase?? Or can you just add more woofers to move more air??

 

not necessary double the loudness...just double the acoustic power i think...not sure.

10db is more of "to the ear" loudness...depends on the install though

 

haha, i heard to gain an extra 3db when your over 100dbs already, you have to double your amp power.

 

to gain 3dbs at any level it is double the power theoretically

 

ok i found this on the crutchfield web site.for how big of an amp you can put in a factory electrical system...

Q: What's the biggest amp I can hook up to my car's electrical system?

A: Your car's alternator ampere rating determines how powerful an amplifier you can install. Multiply the ampere rating by 40%, and you'll get a rough idea of how much reserve current capacity your car's system has. Next, you'll need to calculate the approximate current draw of the amplifier you're considering installing.

To calculate the current draw of an amplifier, multiply the number of channels by the RMS watts per channel (a 2 channel amp rated at 300 watts RMS per channel would be 600 watts). Double it to account for amplifier inefficiency (600 watts X 2 = 1200 watts), then divide by the average output Voltage of an alternator, 13.8 volts (1200 divided by 13.8 = 87 amps). Since the average music signal requires about 1/3rd of the average power in a test tone, divide by 3 (87 amps divided by 3 = 29 amps). The result is the amplifier's approximate average current draw.

A fast-and-nasty way to ballpark an amplifier's current draw is to divide the total fuse value of the amp by two. For amplifiers with multiple fuses, the rating of all fuses provided with the amp must be added together. This will likely produce a significantly higher estimate than using the proper formula. Although inaccurate, this will err on the side of safety.

Finally, compare the amplifier's approximate current draw to your vehicle's reserve current capacity to determine if the electrical system can support the amplifier.

If all those numbers are a bit much, here's a simpler way to think about it: an alternator capable of producing 65 amperes is usually adequate for systems up to 270 X 2 watts RMS. A compact car with a 35-amp alternator can accommodate around 150 X 2 watts of power, while a Sport Utility with a 145-amp alternator can handle a 600 X 2 watt system. Car audio competitors often replace their vehicle's alternators with heavy-duty upgrades to accommodate big power demands.

 

so how big is your alternator?

 

thats a good size for a car. you should be good with at 750-1000 watts then

 

cool,but dont forget the big 3.do that and your good to go