Reference Standard Key System Benefits · Full AMDTM tweeter technology for smooth, ruler-flat response · TwinStageTM aluminum heat sink, to further increase power handling · Long-strand carbon fiber woofer cone, for deep bass and high power efficiency · System-specific crossovers with adjustable equalization settings · Designed specifically for superb on- and off-axis response Boston Z defines absolute top-level mobile audio performance. Outstanding bass extension and the smoothest, most accurate octave-to-octave tonal balance ever give this system bragging rights unlike any other. Factor in an innovative design that's as stunning to look at as it is simple to install, and you've got sound and style that will awe even the most experienced audiophile. TwinStageTM heat sink Effectively pulling heat away from the voice coil, two separate aluminum heat sinks, working together as one, improve power handling and reliability. The first heat sink is located inside the voice coil; the second surrounds the main woofer magnet assembly. Long-strand carbon fiber cone Provides a high strength-to-weight ratio, for high resolution and quick transient response without sacrificing efficiency. Cast aluminum woofer basket For improved strength, heat dissipation, and air flow. Type-M1 tweeter The Type-M1's 1-inch hard anodized alloy dome is extremely lightweight and ultra strong--delivering high output levels without the harsh break up associated with traditional designs. Full AMDTM(Amplitude Modification Device) This patented tuning device uses precisely sized hollow tubes positioned in front of the tweeter to refocus short wavelength energy and create an extremely smooth, ruler-flat response. How flat you ask? 2kHz to 30kHz ±1dB without added equalization. Key Installation Benefits · 24dB crossovers allow for the best possible tweeter response in a range of positions, while enabling bi-amp and bi-wire configurations · A unique axis-mount design enables the tweeter and woofer to be installed as one piece or separately · VariMountTM adapter rings allow for fast, easy installation in virtually any factory cutout size, including 5 x 7-inch System-specific crossover Housed in an aluminum case that pulls heat away from the components for increased power handling; the crossover features low DF/ESR polypropylene capacitors, G-10 circuit boards, 24dB octave slopes, and unique equalization settings that deliver optimized system performance in both infinite baffle enclosures and reduced volume enclosures. VariMountTM Boston Z comes with several mounting adapters, making it possible to drop the speakers into the most common factory locations. Z6 fits into 160mm, 165mm, and 5 x 7-inch locations (1/2-inch spacer included). Z5 fits 130mm DIN--found in many high-end imports. Z6 Z5 2 component models: Z6 6 1/2-inch Z5 5 1/2-inch ...