POLK AUDIO LSiM704 C CENTER 2-way High Performance Bookshelf Loudspeaker -EBONY-

Tweeter 1¨Dynamic Balance Ring Radiator x1
Mid/Woofer 5 ¼ ¨ Dynamic Balance x2
Frequency Response 40Hz - 27kHz
Nominal Impedance 4 Ohms
Rec. Amplifier Power 20-200 W/Channel
Sensitivity 88dB
Dimensions (cm) 17.78x 55.24 x 22.86

Tweeter 1¨Silk Dome Dynamic Balance x1
Mid/Woofer 5 ¼¨Dynamic Balance Bi-Laminatex2
Frequency Response 53Hz - 25kHz
Nominal Impedance 8 Ohms
Rec. Amplifier Power 20-125 W/Channel
Sensitivity 91dB
Dimensions (cm)  17.78 x 50.80 x 20.32

Specifications

System Format:    2 Way
Frequency Response:    55 Hz - 60 kHz
Sensitivity (1W@1M):    89 dB
Nominal Impedance:    8 ohms
Maximum S.P.L
(Per pair in room):    111.5 dBA
Power Handling (RMS):    150 W
Recommended Amplifier Requirements (RMS):    100 - 150 W
Bass Alignment:    Sealed Cabinet
Crossover Frequency:    2.8 kHz
Drive Unit Compliment:    2 x 5.5" RST bass/mid-range driver
1 x C-CAM H.F ribbon transducer
External Dimensions excl Stand (H x W x D)

172 x 461 x 303 mm
(6 11/16 x 18 1/8 x 11 15/16 inch)
Weight (each) Excluding stands:    6 Kg (13.25 lbs)

AVAILABLE IN SIX COLOR FINISHES

Driver Complements
Mid/Woofer     2 - 3 1/4" Diameter (8.26cm)
Dynamic Balance aerated polypropylene cone with Extended Linear Motion voice coil driver
Midrange    
Tweeter     1 - 3/4" Diameter (1.91cm)
Dynamic Balance ring radiator tweeter
Electrical
Overall Frequency Response     90Hz-31kHz
Lower -3dB Limit     115Hz
Upper -3dB Limit     28kHz
Nominal Impedance     8 ohms
Recommended Amplifier Power     10-125 w/channel
Efficiency     90 dB
Inputs     Gold-plated 5-way binding posts
Dimensions
Cabinet Size     4 5/16" H x 16 11/16" W x 3 15/16" D
(10.95cm H x 42.39cm W x 10.00cm D)
Mounting Options     keyhole slot; one .25 x 20 threaded insert
Enclosure Type     Steel-plate reinforced curved enclsoure with time-aligned driver geometry and PowerPort bass venting
Shipping/Other
Product Weight     4.70 lbs. (2.13kgs)
Shipping unit:     each
Total Shipping Weight     5.50 lbs. (2.49kgs)
Speaker Warranty     5 years parts and labor (original purchaser)

Power handling (watts): 170 (RMS)  
Sensitivity (dB): 90  
Nominal impedance (ohms): 8  
Magnetically shielded
W x H x D (mm): 480 x 178 x 195  
Weight (kg): 9  
Frequency response (Hz): 35 - 45,000  
Connections: Gold-plated 4mm banana socket/binding posts  
Bass port Rear reflex  
Drivers: HF: Dual ring-radiator design
LF: 2 x 130mm pressed allow cones with twin Neodymium magnets and long throw voice coil  
Supplied accessories: Removable grille  
Finish: black ash/ walnut