Enhance the dialogue of your movies and TV shows with the walnut Polk Audio Reserve Series R400 Two-Way Center Channel Speaker. It can handle 20 to 200W of power from your amplifier and is equipped with two 6.5" polypropylene turbine woofers and a 1" Pinnacle Ring Radiator tweeter, plus two rear-firing X-Port bass ports. It has a frequency response of 48 Hz to 39 kHz for enhanced treble and midrange reproduction. Rubber feet help reduce unwanted resonance from your cabinet or TV stand.

Two-Way Speaker Design    20 to 200W Recommended Amplifier Power    2x 6.5" Polypropylene Turbine Woofers    1" Pinnacle Ring Radiator Tweeter    48 Hz to 39 kHz Frequency Response    Dual Rear-Firing X-Port Bass Ports

Polk Reserve is a premium loudspeaker series that incorporates the custom transducers from Polk's flagship Legend series alongside new Polk innovations in cabinet and port design to deliver flagship music and movie sound without flagship prices. It is Dolby Atmos and DTS:X compatible and certified for Hi-Res Audio.

Born of 50 years of speaker engineering, the Pinnacle Ring Radiator Tweeter features a finely tuned waveguide that dramatically improves the dispersion of high-frequency energy, ensuring a broad sweet spot and consistent sound in every listening position. Hi-Res certified, the Pinnacle Tweeter is designed for today's two-channel music listening as well as multichannel 3D audio found in movies, sports, and video game soundtracks.

The Polk-designed Turbine Cone is a foam-core, injection-molded cone made of polypropylene with turbine geometry that dramatically increases stiffness and damping without adding mass. This results in a smooth, detailed mid-range with three-dimensional imaging that brings music and movies to live.

Featuring an Eigentone Filter (ETF), Polk's newly patented X-Port consists of a set of closed-pipe absorbers specifically tuned to dramatically reduce traditional speaker distortions, creating deep, effortless bass. This ensures that the upper bass and mid-range are free of port and cabinet resonances for clear, smooth, and detailed sound.

Hi-Res Audio files deliver sound with quality superior to that of CDs. For a loudspeaker to qualify for the Hi-Res certified badge, it must be able to play up to 40 kHz. Reserve speakers meet these requirements, ensuring all the high-resolution detail delivered from the amplifier is played back faithfully by the speaker.

Driven by the Reserve's proprietary technologies, the series delivers exquisitely balanced, dynamic, and detailed sound every time.

During the development of the Legend series, Polk helped the team at IMAX create the IMAX Enhanced loudspeaker specification, ensuring that only the highest-performance home theater speakers would qualify. The Reserve series' IMAX enhanced certification guarantees an unforgettably huge and dynamic home theater experience when enjoying IMAX Enhanced movies, TV shows, and music.

The Polk Reserve series is compatible with both Dolby Atmos- and DTS:X-enabled A/V receivers and pre-amp processors as well as Dolby Atmos and DTS:X virtualizers.

Mix and match Reserve speakers to fit most rooms and configurations without concern. The Reserve series guarantees great, timbre-matched sound in any configuration.

Step up to dynamic, detailed home theater. Choose the Reserve series configuration that matches your room's needs, and add an optional HTS series subwoofer to provide even more bass.

The Reserve series is IMAX certified and compatible with Dolby Atmos, DTS:X, and Auro 3D home theater technologies. Adding the optional Reserve 900HT height modules to your Reserve home theater means your movie room is ready for anything, including the most dynamic 3D audio movie mixes available.

Related Questions and Answers

Q: 1. Will it fit on the benro mach3 tma28a?

A: Sorry, but this is for Center Column for 2 Series Tripods not the Benro TMA28A Series 2 Mach3 Aluminum Tripod B&H # BETMA28A.

Q: 2. What is the diameter of the mount platform?

A: The diameter is approximately 2 .

Q: 3. what is the external diameter of this column?

A: Benro states the measurements of the Benro AC1 Aluminum Center Column for 1 Series Tripods is 24mm x 325mm. As such, the diameter for the AC1 would be 24mm.

Q: 4. Will this short column fit the Benro Aero 4 tripod?

A: Yes, that is compatible.

Q: 5. Will this fit on a Gitzo Series 1 tripod?

A: Technically it will attach but it might be way overkill for such a small tripod. Plus the base diameter of this head is 40mm so it will probably hang over the edge of the top plate of the tripod.

Q: 6. Compatable with Induro AT-213?

A: Yes, the column will fit in that tripod

Q: 7. Does this fit the TAD27A Benro tripod?

A: B&H never responded so I took a chance and bought this. It DOES fit my TAD27A, and comes complete with screw and tripod hook. It's a bit shorter than the stock one. I bought this so I can attach a gimbal, and now can do a quick change simply by yanking out the center post. The extra post cost less than a clamp/plate combo, and I can now loctite my heads down solid.

Q: 8. Will this fit a Benro A250F tripod?

A: Not that we are aware of. This is only compatible with Benro Series 2 tripods.

Q: 9. What is the length of this item? I'd like to get an identical spare for my TMA47AXLis this a shorter version?

A: Benro USA states that the length of the Benro AC4 is 10.5 (26.67 cm), the column diameter is 2.7 (69mm), the thread size is 3/8 -16, Male reversible to 1/4 x 20, and the weight is 11.4 oz (0.32 kg). The column is manufactured from aluminum alloy.

Q: 10. will this fit the CLT303 3-Series Induro Classic Carbon Fiber Tripod?

A: It will not. The part is designed specifically for Benro Aluminum 3 series tripods.