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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Klipsch Reference Premiere RP-504C II Center Channel Home Theater Speaker with Updated Tractrix Horn and Port Technology and 5.25 Cerametallic Woofer for Crystal-Clear Dialogue in Ebony, Wired

Product ID: 443283561

Details

Audio output mode
Surround
Brand
Klipsch
Connectivity technology
Remote
Frequency response
20 KHz
Speaker maximum output power
25 Watts

📐90x90mm Tractrix Horn for crisp dialogue

🔊5.25" Cerametallic Woofer for distortion-free bass

🎚️LTS Anium Tweeter for ultra-clear highs

Description

🎬 Elevate every word, feel every beat — your home theater’s vocal hero.

POWERFUL CLEAN BASS - Cerametallic woofer and Tractrix ports combine for punchy, controlled low-end that fills your space without boominess.
VIBRATION FREE DESIGN - Advanced cabinet bracing and furniture-grade finish make this speaker a sleek centerpiece with zero unwanted resonance.
DISTORTION MINIMIZED HIGHS - Exclusive Linear Travel Suspension tweeter ensures fatigue-free, detailed sound for marathon binge sessions.
CRYSTAL CLEAR DIALOGUE PRECISION - Larger Tractrix horn delivers razor-sharp vocal clarity that puts you in the director’s chair.
SEAMLESS HOME THEATER INTEGRATION - Wired connectivity and 5.1 channel compatibility guarantee effortless setup for immersive surround sound experiences.

The Klipsch Reference Premiere RP-504C II is a wired center channel speaker featuring a larger 90x90 silicone composite Tractrix horn, a 5.25-inch Cerametallic woofer, and an exclusive Linear Travel Suspension Anium diaphragm tweeter. Designed for crystal-clear dialogue and distortion-free sound, it incorporates vented tweeter housing and Tractrix port technology for enhanced detail and powerful bass. Its advanced cabinet design minimizes vibrations, making it both a high-performance and stylish addition to any home theater setup.

Specifications

ASIN	B09V5RXS2D
Additional Features	Vented Tweeter Design
Age Range Description	Adult
Antenna Location	For Computers, For Music Players, For Surround Sound Systems
Audio Driver Size	5.25 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Best Sellers Rank	#98,821 in Electronics ( See Top 100 in Electronics ) #17 in Center-Channel Speakers
Brand	Klipsch
Built-In Media	Speaker
Color	Black
Compatible Devices	Television
Connectivity Protocol	Wired
Connectivity Technology	Remote
Control Method	Touch
Controller Type	Corded Electric
Customer Reviews	4.8 4.8 out of 5 stars (285)
EU Spare Part Availability Duration	7 Years
Enclosure Material	MDF, Vinyl
Frequency Response	20 KHz
Impedance	8 Ohms
Is Waterproof	False
Item Dimensions D x W x H	38.3D x 81.4W x 17.4H centimeters
Item Weight	36 Pounds
MP3 player	No
Manufacturer	Klipsch
Model Name	RP-504C II Eby
Model Number	RP-504C II Eby
Mounting Type	Tabletop Mount
Number of Audio Channels	5.1
Number of Items	1
Power Source	Corded Electric
Series Number	504
Speaker Maximum Output Power	25 Watts
Speaker Size	5.25 Inches
Speaker Type	Center Channel
Specific Uses For Product	home theaters, listening to music
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	5.25 Inches
Tweeter Diameter	1 Inches
UPC	743878046434
Unit Count	1 Count
Warranty Description	1 year manufacturer
Warranty Type	1 YEAR WARRANTY
Water Resistance Level	Not Water Resistant
Wireless Technology	No Wireless Communication Technology
Woofer Diameter	5.25 Inches

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