subwoofer Q

i have 2 type x's ive exchanged for 3 paris already, im starting to thing that the type x's are a POS, i spent 700-730 for both of them, can anyone tell me what sub is good to compare them to?
Specs :
Features:
Woofer

4-Layer 220ºC High Temp Wire with Inner/Outer Winding on Twin-Wall Brass Former
Carbon Fiber/Aluminum Honeycomb Parabolic Cone
Custom Cast Aluminum Frame
Designed and Engineered in the USA
Dual Voice Coil Design
FEA Optimized CRC T-Drive Motor Structure with Copper Shorting Sleeve & Heat Transfer Technology
FEA Optimized Hhigh Excursion Injected Santprene® Multi-Roll Surround
FEA Optimized High Excursion Injected Santoprene® Surround
FEA Optimized Mirrored Progressive Nomex® Spiders with Integrated Tensil Leads
Gold Plated Insert Terminal Block with VC Jumpers
Hidden Screw Gasket
Integrated Spider Landing and Heat Transfer Plate
Massive Triple Stacked Strontium Magnets
Multi-Stage Ventilation System (Dual Flare Pole, Spider Plateau & Frame Leg Venting, Cone/VC Junction Venting
One-Sided Terminal Layout
Specs:
General-Subwoofers

Diaphragm Material : Carbon Fiber/Aluminum Honeycomb/Kevlar Reinforced Pulp
Magnetic Weight : 130oz.
Mounting Depth (top mount) : 218 mm (8.6")
Mounting Diameter (top mount) : 231 mm (9.1")
Recommended Box Types : Sealed/Vented/Bandpass
Recommended Sealed Box Volume : 0.75 – 2.0 cu. ft.
Spider Material : Nomex®
Voice Coil Diameter : 75 mm (3")
Power Handling

Power Handling Capacity (Peak) : 3000W
Power Handling Capacity (RMS) : 1000W
Thiel Small Parameters

Coil Height (Hvc) : 48.1mm
Cone Area (Sd) : 529sq. cm
D.C.Coil Resistance (Re) : 3.6ohm + 3.6ohm
Electrical Q (Qes) : 0.69
Equivalent Suspension Stiffness (Vas) : 32liters(1.1cu.ft.)
Free Air Resonance (Fs) : 28Hz
Frequency Response : 23Hz - 200Hz
Gap Height (Hag) : 10mm
Impedance (Nominal) : 4ohm + 4ohm
Linear Excursion (X linear) : 19.1mm
Maximum Excursion (X peak) : 22mm
Mechanical Excursion (Peak-to-Peak) : 75mm
Mechanical Q (Qms) : 8.67
Sensitivity : 83dB/W/M
Total Loudspeaker Q (Qts) : 0.64

POS? Um, no. Sound great IMO, and get loud too. Installation issues eh?

i thought the same also, i got my subs 2nd time they're were like a dmg on the bottom side of it, then i had it burning up they're prob both playing at 500rms

btw you are right, they sound fucking hella nice IMO, but do they last?

the ones i've heard are pretty nice, and my friend is running 550rms into a 12, no problems yet