The Polk CSiA4 speaker is a well-rounded center channel speaker at a reasonable MSRP of $279.95. It’s available in many retailers for under $200 which makes it a great center channel speaker buy.
Available in black or cherry, this speaker uses a 1″ silk/polymer-composite dome tweeter along with two 5.25″ drivers. It is designed as part of Polk’s RTiA Series, but will probably timbre-match any Polk speaker series.
Unlike most speaker cabinets that are box-shaped, the CSi A4 has a pretty neat unique contoured top design. This shape creates an asymmetrical internal space to help eliminate resonances there, but also gives you the option of flipping the speaker upside down and placing it on the floor so that the drivers point at you directly. Audio from the speaker sounded clear and concise with a lifelike presence. You could opt for a much larger CSi A6 speaker which gives you more power for a bigger entertainment space, but if your system setup is space challenged, then the A4 is the perfect option.
Because the speaker only goes down to 65 Hz on the low end, you will need a subwoofer setup to experience the best of what this speaker has to offer. You wouldn’t want your center channel to put out thundering low-end anyway in a well-designed home theater surround speaker setup so this is not an issue. However, if you are looking for a center channel speaker without a subwoofer setup, then you would be better off with the Polk S30 model that can hit lower, down to 42 Hz.
The CSiA4 is a high performance center channel speaker for smaller rooms and challenging placement situations. It features two 5 1/4-inch Dynamic Balance® drivers, one 1-inch Dynamic Balance dome tweeter for spot-on imaging, seamless soundstage and natural sounding voices. With the asymmetric cabinet design, you gain the flexibility to placing the CSiA4 above or below the TV and aim it at your position.
Features & specs
Enclosure: Bass Reflex
Woofer size (inches): 5-1/4
Connector Type: 5-way post
Power Range: 20-180
Sensitivity: 89 dB
Impedance (Ohms): 8
Frequency Response: 65Hz-25k Hz
Height (inches): 6-7/8
Width (inches): 20-1/16
Depth (inches): 9-1/16
Weight: 15.5 lbs