Blue Sky SUB 212 Subwoofer

Blue Sky’s SUB 212 is a sealed box, dual 12”, push-pull, 400-Watt subwoofer. It features an anechoic frequency response of 25Hz to 200Hz, +/-3dB. In addition, the SUB 212 also has built-in 2.1 bass management electronics with both a 4th order 80Hz Linkwitz-Riley low-pass filter and a 2nd order 80Hz high-pass filter that is perfectly matched to the response of the SAT 8 (the SUB 212 is also compatible with the SAT 12, SAT 6.5 and SAT 5).


The SUB 212’s unique “push-pull” configuration is designed not only to increase output, but also to reduce distortion. A push-pull subwoofer uses two drivers: one mounted facing forward, the second mounted backward with the magnet facing out. Utilizing two drivers doubles the maximum output, while the push pull configuration reduces even harmonic distortion. Typically, in a more conventional design, at high output levels, second harmonic distortion dominates the distortion spectrum of most subwoofer drivers and is caused by asymmetric operation of the suspension and magnetic structure. In simple terms; the output of the driver is slightly different when the cone is moving away from the magnet, as compared to when it is moving toward its magnet.


Push-pull operation reduces this even harmonic distortion in a clever application of physics. As mentioned before, push-pull uses two drivers, one reversed from the other. The bottom driver has its magnet facing out of the box and is driven electrically out–of–phase from the front driver, which keeps both drivers acoustically in phase. However, when the front driver’s cone is moving away from its magnet, the bottom driver’s (reversed) cone is moving towards its magnet. This puts the even harmonic distortion components of the bottom driver out-of-phase with the front driver. When you combined the outputs of both drivers, the even harmonic distortion of both drivers cancels, reducing the overall distortion of the subwoofer.

When combined, the SAT 8 and SUB 212 provide a stunningly accurate and engaging, full-range monitoring system.


Blue Sky  SUB 212 Features :

          o Bass Extension
            Down to below 30Hz (typical in-room response down to 20Hz)

          o Compatible
           The SUB 212 includes full 2.1 bass-management circuitry that ensures seamless summation when used with Blue Sky's SAT 8, SAT 6.5 / SAT 6.5 MKII, SAT 5 / SAT 5 MKII, and SAT 12.
           Additionally the SUB 212 is also fully compatible with any THX pm3 approved nearfield monitor (visit www.thx.com for more information).

          o Sealed Box Design
           No port = no port noise = better transient response = greater SLAM!

          o Easy Setup
           Straight forward with excellent customer support, if needed.

Blue Sky  SUB 212 Specifications :

 * All measurements / specifications are measured using the SUB 212's direct input, which does not have a low pass filter.


Voltage Sensitivity     100dB SPL @ 100mv @ 1M (40 to 80Hz bandwidth limited)
Frequency Response (anechoic)     30 to 200Hz +/-3dB
Typical In-Room Response     20 to 200Hz (3000 Cubic Feet)

Bass Management Section    
Input Impedance     20k Ohms balanced
Common Mode Rejection Ratio     40dB typical @60Hz
Maximum Input Level (all inputs)     +24dBu balanced
Maximum Output Level     +24dBu balanced
Output Impedance     200 Ohms balanced
Auto Mute Time Out     >15 Minutes
Mute Threshold (all inputs)     30mV

Left & Right Inputs to Sat Outputs    
Gain (balanced in and out)     0dB
High-Pass Filter type     2nd order Linkwitz-Riley
High-Pass Filter Cutoff     80Hz
High-pass Filter Q     0.707
THD + Noise     0.002% @ 1kHz @ +4dBu

Left & Right Inputs to Sub Out    
Gain     0dB
Low-Pass Filter Type     4th order Linkwitz-Riley
Low-Pass Cutoff     80Hz

Subwoofer Direct In to Direct Output    
Gain     0dB
Low-Pass Filter     None

Enclosure    
Solid 3/4" MDF construction with 1"" MDF Front and Rear Baffle"
Viscoelastic energy absorbing front baffle coating    
Flush mounted driver    
Isolation feet are included. Inserts for optional attachment of spike feet.    

Dual 12" Woofers    
Long excursion design with cast aluminum frame.    
2" voice coil with vented motor for high power handling    
Fully video shielded    
Subwoofer Amplifier    
Discrete symmetrical bipolar design with localized feedback    
2 X 200-W RMS into 4 Ohms    
THD + Noise less than 0.015% at rated power @100Hz    
Adjustable gain control    


Dimensions : 24.2" H x 15" W x 21.4" D (22.07" with heatsink and grill)
Weight : 96 lbs.