subs, midbass, amps?

l want to buy speakers for midbass what is better brand alpine pioneer kenwood   kickers

whats louder two s12l7 or four 15cvx or six 10cvx

if ported i would say the four 15cvxtwo 12" cadence TXW-12S, cadence TXA-3002 amplifier, 1990 toyota celica system 10 speakers

It all depends on The box, the vehicle, the power provided for each sub there are 2 many veribles, I can make 2 10's louder then anything most people have heard in thier life, but it also ake 6600watts RMS and lots of power to run the amps, the right enclosure and a car that is very friendly for SPL use.2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

if l conect two kx1200@1ohm did they put the same power like kx2500@2ohm thanks

ok thanks for reply you think 140 amps enough for those amps and for know l am going to conect  one kx1200 @2ohm  about 600 rms

With an extra battery you'll be fine. If you go with one battery for now, read the voltage while driving hard if it remains above 13 volts and also see if  it overheats to test for lack of  battery power.Prepare your future. It wasn't the lack of stones that killed the stone age.

If you strap[ the kx1200.1's yopu cannot go below 2 ohm.    it will put out 2500WRMS at 2 ohm strapped for 2 amps and they will draw upwards of 200 amps of currentThey will run at 1 ohm strappd but will draw upwards of 300 amps and will get very hot, but they will run for a short amount of time before going in to protectIf your voltage falls below 11 volts then they wil shut off anyways2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

ok thanks for help the last question for sq whats better  10 12 15 cvr l want 4 subs