One's Plus.
No, but really... //content.invisioncic.com/y282845/emoticons/search.gif.e79a63b2b580b39b282dff402646b704.gif
The M6:
# Excellent separate mid bass driver
# Excellent separate sub bass driver
# Excellent 6.5 component set w/exended bass response at double power handling
# Excellent use in a Braxial tweeter on a bracket configuration
# Mounting Depth: 2.94"
# Diameter: 6.5" (170mm)
# Sensitivity: 88.1dB
# Power Handling: 150w RMS (300w Peak)
# Prequency Response: 10-4000Hz
# Nominal Impedance: 4 Ohms
# Voice Coil Diameter: 1.37" (35mm)
# Peak Xmax: 10mm
# Magnet Weight: 30oz
# Free Air Resonance: 52Hz
# Voice Coil DC Resistance: 3.8 Ohms
# Mechanical Q (QMS): 2.46
# Electrical Q (QES): 0.516
# Total Q (QTS): 0.426
# Compliance Volume (VAS): 15.05; 0.53 ft3
# Moving Mass, Diaphragm: 20.0Gr
# Motor Force Factor: 5.68 Tm
The M6+
* The M6+ (cast alloy red frame) has a more massive voice coil than typical bass/midrange and leans toward the bass in the sound compared to the standard high-end mid drivers. The upper midrange is somewhat mellower than standard high-end mids which creates a very very smooth and balanced non-fatiguing sound with an extension in the bass region never heard of before from a 6.5 mid driver.
* Diameter: 6.5"
* Sensitivity: 83.8dB
* Maximum Power Handling: 240 Watts Peak
* Nominal Power Handling: 120 Watts RMS
* Frequency Response: 10~4000 Hz
* Nominal Impedance: 4 Ohms
* Voice Coil Diameter: 1.5"
* Peak Xmax: 12mm
* Magnet Weight: 30 OZ
* Surround Material: Rubber
* Frame Type: Cast Alloy
* Cone Material: Fiberglass
* Mounting Depth: 3.37" (top mount)
* Cutout Diameter: 5.812"
* Overall Outer Diameter 6.81"
M-6+ - CDT Audio 6.5" 240 Watt Mid-Bass/Sub-Bass Drivers M 6 + M-6+
Straight from woofersetc.com //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif