First set is

**Alpine Type R's SWR-1242D**

12" subwoofer with dual 4-ohm voice coils

Kevlar reinforced pulp cone with Santoprene™ rubber surround

cast aluminum frame with perimeter venting

frequency response: 25-500 Hz

power handling: 200-500 watts RMS (250 watts per coil)

peak power: 1,500 watts

sensitivity: 85 dB

top-mount depth: 7-5/8"

sealed box volume: 0.57-1.0 cu. ft.

ported box volume: 0.75-2.0 cu. ft.

Second set

**Image Dynamics IDQ12D2 V.2**

Nominal Impedance (IMP) 1 / 4 ohm

DC Resistance (Re) .975 / 3.9 ohms

Resonant Frequency (Fs) 19Hz

Electrical "Q" (Qes) .271

Mechanical "Q" (Qms) 4.59

Total "Q" (Qts) .256

Equivalent Volume (Vas) 5.04 ft3

One Way Linear (Xmax) 13.5 mm

Cone Area (Sd) 530 cm2

Sensitivity (Spl) 90.2 db

RMS Power Handling (Pwr) 100 to 500

Speaker Displacement .07 ft3

Im going to be powering these with a Alpine amp MRP-M1000. Now I found the Alpine Type R's on amazon for $104 each and the local radio shop is basically selling them for $99. The box is $150 from the local shop. any opinions about the 2 diff. subs. THX in adv sorry about the long thread.

**Image Dynamics link**: http://www.imagedynamicsstore.com/idstore/image-dynamics-idq12d2-dual-subwoofer-p-116.html

**Alpine Type R's**:http://www.crutchfield.com/p_500SWR1242/Alpine-SWR-1242D.html?tp=111

:thx