RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
The Polk Audio CSi A6 is a high-performance centre channel speaker designed to deliver clear movie dialogue and rich sound effects in a home theatre system.
Dual 165 mm Dynamic Balance woofers and a 25 mm silk/polymer dome tweeter produce midrange detail, smooth highs and powerful output for movies, TV and gaming. This pre-owned speaker is in good condition in cherry, supplied with the manual but no original packaging.
Aimed at enthusiasts who want convincing dialogue and a proper centre foundation, the CSi A6 brings scale and composure that suit matching Polk towers or other 8 Ω front speakers.
Visit our Lane Cove showroom to hear how the CSi A6 anchors a home theatre mix.
Why Choose the Polk Audio CSi A6 Centre Speaker?
The CSi A6 is built to keep speech intelligible while still moving enough air for effects and music in a multi-channel system.
• Clear Dialogue: Dual mid-woofers and a silk dome keep voices natural and easy to follow.
• Strong Output: 20–200 W power handling supports dynamic film soundtracks.
• Cleaner Bass Venting: PowerPort design reduces port noise compared with a simple tube.
• Resonance Control: ARC technology helps the cabinet stay out of the way of vocals.
• Flexible Connection: 5-way binding posts accept a wide range of speaker cable terminations.
Audition the Polk Audio CSi A6 at our Lane Cove showroom to assess its dialogue clarity and centre-channel weight.
The CSi A6 speaker uses a vented enclosure with dual PowerPort bass venting and an ARC port.
Frequency response of 45 Hz to 27 kHz and 90 dB sensitivity give it enough bandwidth and efficiency to keep up with capable front speakers without needing excessive amplifier power.
At 197 × 610 × 356 mm and just over 13 kg, it is a substantial centre rather than a slim soundbar substitute. That extra cabinet volume is what allows the Polk Audio CSi A6 to sound fuller and more authoritative on both speech and soundtrack effects.
Technical Specifications
• Product Type: Pre-owned
• Speaker Type: Centre channel
• Enclosure: Bass-reflex with PowerPort and ARC port
• Mid/Bass Drivers: 2 × 165.1 mm Dynamic Balance polymer-composite woofers
• Tweeter: 25.4 mm silk/polymer composite dome
• Frequency Response: 45 Hz – 27 kHz
• –3 dB Limits: 55 Hz – 26 kHz
• Recommended Amplifier Power: 20 – 200 W
• Maximum Power: 200 W
• Sensitivity: 90 dB
• Nominal Impedance: 8 Ω
• Connections: Dual 5-way binding posts
• Special Features: Rear kickstand, video-shielded design
• Dimensions (H × W × D): 197 × 610 × 356 mm
• Weight: 13.61 kg
• Finish: Cherry
• Included: Manual (no original packaging)
Learn more about the CSi A6 in the Crutchfield reviews here.
Let us show you the remarkable Polk Audio CSi A6 at Len Wallis Audio. Explore our second-hand hi-fi & AV collection here or contact our team to audition this centre speaker at our Lane Cove showroom or enquire online.
Len Wallis Audio Excellence Promise
Since 1978, Len Wallis Audio has been a trusted name in hi-fi, curating premium audio solutions from our Lane Cove showroom in Sydney. For over four decades, we’ve selected products that deliver outstanding performance and quality.
Our focus on innovation ensures every item meets audiophile standards. Whether upgrading or building a new system, our team helps you find the ideal audio solution for your needs.
Experience the CSi A6 in person with an audition at our Lane Cove showroom. With expert guidance and a commitment to satisfaction, we make your audio journey seamless and rewarding.
Ready for clearer home-theatre dialogue with the Polk Audio CSi A6 Centre Speaker?
Call (02) 9427 6755
Email [email protected]
Or visit us at 64 Burns Bay Road, Lane Cove, NSW, 2066
A$375 is a fair ask to slightly ambitious, not a steal. Typical used references for this model sit around A$230–A$360 equivalent, with some clean examples nudging higher, so A$375 is only reasonable if it’s genuinely excellent condition and ideally with the original grille and packaging.
That said, it’s a well-regarded center: big, dynamic, and notably good at keeping dialogue clear and effortless in a matching Polk RTi setup. If the cabinet and drivers are clean, it’s a sensible buy for someone building a home-theater front stage and wanting a proper timbre-matched center rather than a random placeholder.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Polk Audio emerged in 1972 from the inventive spirit of three Johns Hopkins University graduates—Matthew Polk, a physics major, George Klopfer, and Sandy Gross—in Baltimore, Maryland. What began as a modest venture building public address systems for local events evolved into a dedicated speaker company after an initial contract fell through, leaving the founders to sell their redesigned cabinets directly. Fueled by passion for music and hi-fi innovation, they secured Small Business Administration loans, relocated operations, and rapidly scaled production, hitting $1 million in revenue by 1976 and earning a spot on Inc. magazine's list of America's fastest-growing private companies.
The brand has long focused on loudspeakers as its cornerstone, pioneering models like the Monitor 7 series for balanced dynamics, deep bass, and high-volume performance that bridged European refinement with American power. Polk expanded into automotive audio through partnerships like MOMO in 1999, while maintaining a core lineup of home speakers, including innovative SDA technology for enhanced soundstaging. Though not delving into amplifiers, turntables, DACs, headphones, or cables, their emphasis remains on reliable, high-fidelity transducers engineered for generations-spanning accuracy.
Polk Audio holds a solid mid-tier position in the hi-fi market, prized by enthusiasts for value-driven performance sold through specialty stereo shops and big-box retailers like Best Buy. Once publicly traded on NASDAQ in 1986 before going private in 1999, the brand now operates under Sound United, upholding its legacy of accessible excellence without chasing ultra-high-end exclusivity or vintage obscurity.
See all Polk Audio listings on RADAR.
