Polk Audio CSi A4 - Centre Speaker

Key Specifications & Features

Driver configuration: two 5.25″ (≈ 13.3 cm) Dynamic Balance® polymer-composite woofers + one 1″ (≈ 2.54 cm) Dynamic Balance® silk/polymer dome tweeter.
Frequency response: From ~55 Hz up to ~27 kHz (in some specs) with a –3 dB limit around ~65 Hz.
Sensitivity: ~ 89 dB (1W/1m)
Nominal impedance: 8 Ω.
Power handling: Recommended amplifier power ~20-180 W per channel.
Connections: Gold-plated 5-way binding posts for secure wiring.
Cabinet/placement: Bass-reflex (ported) design, magnetically shielded (so safe to place near TV), and designed for horizontal placement under/over TV.
Dimensions (approx): Width ~20.06″ (~51 cm), Height ~6.88″ (~17.5 cm), Depth ~9.06″ (~23 cm). Weight ~15.5 lbs (~7 kg) for the single unit.

Description

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 place the CSiA4 above or below the TV and aim it at your position.

Warranty:

3-year manufacturer’s warranty

Features:

The proprietary curved enclosure design creates the optimal shear damping for a more rigid, acoustically inert enclosure and minimal cabinet resonances. CSiA4 cabinets are designed for clean, accurate sound.
Klippel motor optimization uses laser measurement technology to ensure a smooth excursion path at either end of the volume spectrum for uniform performance at both low and high volumes.
Polk’s proprietary, patented Dynamic Balance technology allows our engineers to design out the distortion-causing driver and system resonances, so you only hear the good sounds.
Durable, computer-modeled, injection-molded butyl rubber surrounds suppress unwanted cone resonances for a lifetime of reliable sound.
The RTA Cascade Tapered Crossover eliminates the comb filtering and beaming, common to multi-driver speakers, which degrades the quality of the audio and collapses the soundstage.
Patented Acoustic Resonance Control® (ARC) technology suppresses cabinet resonance that distorts to ensure clear and natural sound.
Beautiful curved furniture-grade hardwood veneer cabinet finishes, with sleek trim accents in black or cherry.
Computer-modeled anti-diffraction grilles enhance the good looks while minimizing sonic interference.
All Polk loudspeakers are timbre-matched within their series, designed with the same components throughout, to achieve seamless speaker-to-speaker blending effects in multi-channel systems.
Gold-plated, professional-style 5-way binding posts for the most secure connection options.

Technical Specifications:

Orientation	Horizontal
Height	6.875″ (17.46 cm)
Width	20″ (50.8 cm)
Depth	8.75″ (22.23 cm)
Weight	7.03 kg
Front Array Driver Complement	(2) 5.25″ (13.34 cm) d (Round) Dynamic Balance drivers with polymer composite cones and rubber surround – Midrange (1) 1″ (2.54 cm) d (Round) Dynamic Balance silk polymer dome – Tweeter
Total Frequency Response	55 Hz → 27,000 Hz
Nominal Impedance	8 ohms
Sensitivity (1 watt @ 1 meter)	89 dB
Lower and Upper -3dB Limits	65 Hz → 26,000 Hz
Recommended Amplifier Power Per Channel	20 watts → 180 watts
Speaker Inputs	(1) Pair of 5-way Binding Posts – Gold-Plated