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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Reference Premiere RP-504C II Ebony Center Channel Speaker

Product ID: 438945725

Details

Audio Output Mode
Surround
Brand
Klipsch
Connectivity Technology
Wired
Frequency Response
20 KHz
Speaker Maximum Output Power
25 Watts

🎵5.25" Cerametallic woofers for flawless sound

📐90° x 90° Tractrix horn for crystal-clear dialogue

🔊Tractrix ports for powerful, distortion-free bass

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€ 1064.90

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Description

🎬 Elevate every scene with sound that speaks volumes

POWERFUL CLEAN BASS - Tractrix port design ensures fast air transfer for deep, punchy bass without muddiness.
FLAWLESS SOUND REPRODUCTION - Cerametallic woofers minimize distortion for rich, detailed audio across all volumes.
EFFORTLESS SETUP COMPATIBILITY - Banana plug terminals and perfect synergy with RP-8000F II towers make upgrading your home theater a breeze.
CRISP FRONT ROW DIALOGUE CLARITY - Larger Tractrix horn delivers immersive, razor-sharp vocals that keep you glued to every word.
PREMIUM BUILD MEETS MODERN ELEGANCE - Furniture-grade finishes and magnetic grille combine style with seamless integration into your space.

The Klipsch Reference Premiere RP-504C II Ebony Center Channel Speaker features a larger 90° x 90° Tractrix horn, vented LTS titanium tweeter, and updated 5.25" Cerametallic woofers for crystal-clear dialogue and dynamic sound. Its advanced cabinet design with Tractrix ports delivers powerful, distortion-free bass, while premium materials and magnetic grille offer a sleek, high-end look. Ideal for 5.1 surround setups, it pairs perfectly with RP-8000F II towers, transforming your home theater experience with effortless clarity and cinematic immersion.

Specifications

ASIN	B09V5RXS2D
Additional Features	Vented Tweeter Design
Antenna Location	For Surround Sound Systems
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Best Sellers Rank	#12,032 in Electronics ( See Top 100 in Electronics ) #7 in Center-Channel Speakers
Brand	Klipsch
Built-In Media	Speaker
Color	Black
Compatible Devices	Television
Connectivity Protocol	Wired
Connectivity Technology	Wired
Control Method	Remote
Controller Type	Corded Electric
Customer Reviews	4.8 4.8 out of 5 stars (266)
Enclosure Material	Wood, Titanium, Cerametallic
Frequency Response	20 KHz
Is Waterproof	FALSE
Item Dimensions D x W x H	15.08"D x 32.06"W x 6.87"H
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
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	5.25 Inches
UPC	743878046434
Unit Count	1.0 Count
Warranty Description	5 year manufacturer
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	No Wireless Communication Technology

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TrustScore 4.5 | 7,300+ reviews

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