ok right now, i have 2 12" polk DB's (Dynamic Balances), and a Kenwood KAC-728 powering it...these are the specs for one 12" sub...

12"(30.5cm) Subwoofer
db subwoofer drivers are optimized to deliver explosive bass performance when used in small sealed enclosures. They provide you with deep, tight and musical bass for the true high-end car stereo enthusiast.

Ultra stiff mineral filled polymer cones withstand the extreme mechanical stresses generated in sealed enclosures. These are the stiffest, strongest cones you can buy
Killer bass from enclosures as small as .9 cubic foot
Steel / Polymer laminate basket damps basket resonance for clean, uncolored response
Four-layer 2" diameter voice coil and vented pole piece for superior power handling
Available in 8 and 4 Ohm versions


Cutout Diameter
11"
27.94cm
VAS
2.54 ft3
82.31L
SD
.563 ft2
.0523m2
Winding Width
1"
25.4mm
Xmax - Linear
.343"
8.7mm
Xmax - Mechanical
1"
25.4mm
Height of Air Gap
.315"
8mm
Magnet Assembly Weight
9lb 2oz
4.1kg
Magnet Weight
4lb 2oz
1.9kg
Vd - Volume of Driver
.062 ft3Nominal Impedance
4 Ohm
Frequency Response
20 - 200Hz
Sensitivity
86dB
Power Rating
800 watts
Actual Impedance - RE
3.7
Max. Power (RMS)
400 Watts
Max. Power (Peak)
800 Watts
Resonant Frequency - FS (HZ)
23.6Hz
QMS
4.523
QES
0.510
QTS
0.450
Cms
212
BL
15.00 TM
Mms
179 g


THE SPECS FOR MY KENWOOD KAC-728 AMP ARE:

Key Features Maximum Output Power: 600 Watts x 1
Power Ratings Bridged Power Output at 14.4V (1kHz, 0.8% THD): 300 Watts x 1
Maximum Output Power: 600 Watts x 1
Power Output at 2 Ohms, at 14.4V (1kHz, 0.8% THD): 150 Watts x 2
Power Output at 4 Ohms, at 14.4V (20Hz-20kHz, 0.08% THD): 100 Watts x 2
Power Supply Features 2-Ohm Stable
Black Anodized Top Cover: with Aluminum Heat Sink Plate
Copper-Shielded EE Core Transformer
Large Secondary Capacitors
Large Toroidal Noise Suppression Filter
Power Indicator
Power Input Terminals: Gold-Plated
Power MOSFET Switching Power Supply
Audio Features Ground Isolation Circuit
Quiet Turn-On
RCA Audio Inputs: Gold-Plated
Selectable Low-Pass Electronic Crossover
Speaker Connectors: Gold-Plated
Speaker Level Input Terminals
Speaker Relay Protection
Stereo, Mono, or Tri-Mode Operation

NOW MY QUESTION IS...is the amp i have right now enough for my subs? or can i go even bigger to make them pound harder? if, i can get a bigger amp, please give me some suggestions...thanks

 

The Kenwood's no really doing them any justice.... Sell it (or use it for components) and get something like a JBL BP1200. The JBL runs for about $250-275, depending on where you get it. Then each sub will be getting 600 watts a piece and you'll be much happier.

If you don't like JBL, then a Rockford BD1000 would do the trivk as well, but costs more. Either way, you want an amp that maxes power at 2 ohms for your 2 4 ohm subs.

BTW, what ohms are you running your subs at???? The reason I ask is because your Kenwood maxes power at 4 ohms bridged... Are you running them at 4 ohm stereo, a sub per channel???

 

yeah, you are only pushing 100 rms to each max. thats really weak. considering the subs can take 4 times that.

 

with the OHM ratings for both, that amp and pair of subs dont go together. the JBLbp600.1 would be nice...600watts@2OHM. wire the pair of subs in parallel.

 

ok SiClone is recommending the JBL BP1200.1 and thisISmangina is recommending the BP600.1, which do i go for...which would be better for my subs...one amp is double the wattage...

 

id go with the 600.1
im thinking your subs are probably wired in stereo at the moment ??? if thats the case stepping up to the 600.1 should be a big improvement.

not to mention the 1200.1 will kick your stock charging system's @ss

 

if u cant decide on wat JBL amp to buy, just buy my audiobahn amp. max power is 1600 watts.. it'll make your woofers (and eardrums) pound!! 500 plus shipping.