Is this a big enough upgrade from the 450C to justify?

This is a personal opinion question. It is an upgrade that can be detected under normal conditions by a normal listener; if that is enough to justify it for you, then yes, if not then no.

Will this work with 40hz crossover?

It would work. That being said we would recommend a crossover setting above 50Hz since the frequency range of this speaker is - 50-25kHz +/- 3dB.

can you use regular speaker wires, just remove from old speaker and use on this?

Thanks for your question. If the "old" cable is 16 gauge minimum, in good condition, and bare wires on both ends, it is acceptable. New 14 or 16 gauge speaker cable is recommended. World Wide Stereo – since 1979 – and a proud authorized Klipsch dealer.

can i power this center with 100 watts rms power and not cause clipping or damage to the reciever or speaker? also can i cross this center at 60 hz?

From our Klipsch experts at ListenUp: Yes! you can power this center with 100 watts RMS and not cause clipping or damage to the receiver or speaker. The Klipsch RP-504C II has the following specs: POWER HANDLING (CONT/PEAK) - 150W/600W. You can also cross this center at 60Hz - FREQUENCY RESPONSE - 50-25kHz +/- 3dB.

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Description

🎬 Elevate your home theater game with sound that commands attention!

DEEP DISTORTION FREE BASS - Cerametallic woofers combined with the Tractrix port produce powerful, clean bass that elevates your home theater experience.
SLEEK PROFESSIONAL DESIGN - Compact tabletop mount with premium MDF and vinyl finish fits seamlessly into any modern living space or media room.
IMMERSIVE SOUNDSTAGE PRECISION - The large 90° x 90° Tractrix horn delivers focused, room-filling clarity that puts you at the center of every scene.
EFFORTLESS COMPATIBILITY CONTROL - Designed for home theater setups with remote control support and 8-ohm impedance for easy integration with your AV system.
CRYSTAL CLEAR HIGHS WITH LTS TWEETER - Unique titanium diaphragm tweeter minimizes distortion, ensuring every detail in dialogue and music shines through.

The Klipsch Reference Premiere RP-504C II is a high-performance center channel speaker engineered for home theaters. Featuring a large 90° x 90° Tractrix horn, a distortion-minimizing 1" LTS titanium tweeter, and advanced 5.25" Cerametallic woofers with a Tractrix port, it delivers clear dialogue, detailed highs, and punchy bass. Its sleek MDF and vinyl design fits tabletop mounts, making it a perfect centerpiece for immersive audio setups.

Specifications

Mounting Type	Tabletop Mount
Material	MDF, Vinyl
Model Name	RP-504C-2
Speaker Type	Monitor
Special Feature	Titanium Diaphragm Tweeter
Recommended Uses For Product	Home Theater
Compatible Devices	Television
Subwoofer Diameter	5.25 Inches
Unit Count	1 個
Color	Black
Included Components	-----
Product Dimensions	38.3D x 81.4W x 17.4H cm
Item Weight	16.33 kg
Impedance	8 Ohm
Is Waterproof	False
Warranty Type	1 year manufacturer warranty
Number of Items	1
Control Method	Remote
Speaker Size	5.25 Inches
Power Source	Corded Electric
Batteries Required	No
Frequency Response Curve	50 Hz - 25,000 Hz
Speaker Count	1
Manufacturer	Klipsch
Item Model Number	RP-504C II Eby
Size	5.25 Inch (Pack of 1)
Wattage	150 W

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