Do these make a significant difference in sound quality when using Dolby Surround upmixing on legacy soundtracks?

This also can heavily depend on the receiver in general, technically they are wired in as height or presence speakers, and then fill a Dolby roll. In my case they are run on a Yamaha, so on DTS media, I switch them to height only speakers and they double as DTSX channels. Likewise, the receiver can opt to use them for upmixing and filling content if it is capable, in my case with the Yamaha DSP it uses them in most programs to enhance the soundstage greatly. So its certainly possible. From a pure speaker quality standpoint they sound phenomenal. We hooked them up alone and ran the atmos demos with just them and the sub and the quality was amazing. The range was crazy.

Elac debut 2.0 a4.2 dolby atmos modules, spec said max power input: 80w if i use on denon avr-x2400h(95 watts per channel) will it spoil?

My AV receiver is also Denon and puts out 140 watts per channel. My Debut a4.2 speakers have no problems playing on it. Hope this helps you.

Will they fit properly on an Elac uni-fi b5 bookshelf speaker?

A4.2 is smaller than UB5 and UF5. If stack A4.2 on top of UB5, there will be about a quarter inch on each side, and half an inch on front and rear.

Do these pair well with elac uni-fi uf5 floorstanding speakers?

It should. I use Polk speakers with them with no problems.

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Description

🎉 Unleash the Sound Revolution!

STYLISH DESIGN - Sleek aesthetics that complement any modern space.
ELEVATE YOUR SOUND - Experience immersive audio with Dolby Atmos certification.
SEAMLESS INTEGRATION - Intricate crossover ensures smooth transitions between frequencies.
DYNAMIC BASS RESPONSE - Woven aramid-fibre woofer delivers deep, rich sound.
PRECISION ENGINEERING - Custom concentric driver for unparalleled clarity.

The ELAC A4.2 Debut 2.0 Dolby Atmos Speakers combine cutting-edge technology with elegant design, featuring a woven aramid-fibre woofer, Dolby Atmos certification, and a custom concentric driver for an unparalleled audio experience.

Specifications

Power Source	Corded Electric
Speaker Maximum Output Power	400 Watts
Subwoofer Connectivity Technology	Wired
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wired
Audio Driver Type	Dynamic Driver
Item Weight	5.4 Pounds
Item Dimensions D x W x H	25"D x 25"W x 22.25"H
Unit Count	1.0 Count
Number of Audio Channels	4.2
Frequency Response	180 Hz
Compatible with Vehicle Type	Car
Compatible Devices	Home Theater
Speaker Size	4.92 Inches
Woofer Diameter	4 Inches
Tweeter Diameter	0.5 Inches
MP3 player	No
Specific Uses For Product	Home Theater Systems, Music Listening
Controller Type	Corded electric
Color	Black
Is Waterproof	FALSE
Control Method	Remote
Audio Output Mode	Surround
Mounting Type	Ceiling Mount
Speaker Type	Atmos Enabled
Additional Features	Black Ash Vinyl Finish, Polymer Dome, MDF Cabinets, Woven Aramid Fiber Woofer
Recommended Uses For Product	Music
Subwoofer Diameter	4 Inches

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