Any hiss heard in horns during quiet passages?

This is typically on account of your integrated receiver's THD - on my Pioneer and Mcintosh (both of which have a THD of .005) the speakers were pitch black BUT when I hooked the exact same speakers up to my Rotel Integrated and separate amps (THD .3) there was always an audible hiss, it drove me NUTS - it's actually the reason I got rid of the Rotels. So even though horn tweeters are more sensitive and more likely to hiss - that is not the case with these - it's probably the stereo unit. Hope this helps.

Can these speakers be laid down sideways? I don’t have 19” space between shelves

You could do that if needed i suppose but i will say if you are tight on space i would recommend looking at something a bit smaller. These are beautiful speakers but they definitely require some room, not your average bookshelf speaker by any means.

could you use two of these side by side as a center speaker to match my dual 8in R-28F fronts ?

Yes. however, the tweeter is a 90x60 degree directionality. 90degrees horizontal and 60degrees vertical. If you turn it on its side, the vertical axis become the horizontal axis. So if you watch movies alone, it may be perfect. But i find the 60degrees a bit narrow, and easy to go in and out of the directionality of it. 90 degrees has better fall off. But horn tweeters seem to be a lot more directional than other tech. YMMV I love horn tweeters for movies. Simultaneously more nostalgic theater sound and very crystal clear on sound effects. Works well with speech too.

is this a pair (2 speakers) or just a single unit?

This is a single speaker. You would need to order 2 for a pair.

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描述

🎶 Elevate your sound game—where power meets precision.

DEEP PUNCHY BASS - 8" Cerametallic woofer pumps out rich, high-output lows that bring music and movies to life.
SLEEK VERSATILE - Elegant black woodgrain vinyl finish with dual threaded inserts for seamless integration into any setup.
EFFORTLESS LOUDNESS - 97dB sensitivity ensures you get more volume with less power—perfect for energy-conscious audiophiles.
HORN LOADED CLARITY - Dynamic 1" titanium Linear Travel Suspension tweeter with Tractrix Horn tech for razor-sharp highs.
POWER MEETS PRECISION - 150W RMS / 600W peak delivers immersive, distortion-free audio that dominates any space.

The Klipsch Reference RB-81 II bookshelf speaker combines 150W RMS power with a highly efficient 97dB sensitivity and a titanium horn-loaded tweeter, delivering crystal-clear highs and deep bass in a compact, stylish design. Engineered with proprietary Tractrix Horn technology, it fills larger rooms with lifelike audio, making it the ultimate choice for discerning listeners who demand top-tier performance without sacrificing space.

规格

Is Electric	No
Power Source	DC power supply
Input Voltage	2.83 Volts
Speaker Maximum Output Power	600 Watts
Speaker Size	8 Inches
Woofer Diameter	15.5 Centimeters
Tweeter Diameter	1 Inches
MP3 player	No
Specific Uses For Product	Indoor, larger rooms, music and movie playback
Controller Type	Corded Electric
Color	Black
Is Waterproof	FALSE
Warranty Type	Limited Warranty
Control Method	Touch
Audio Output Mode	Stereo, Surround Sound
Mounting Type	Shelf Mount
Speaker Type	Woofer,Bookshelf, Tweeter
Additional Features	Dynamic 1-inch titanium Linear Travel Suspension horn-loaded tweeter
Recommended Uses For Product	Music
Subwoofer Diameter	8 Inches
Item Weight	12.5 Kilograms
Item Dimensions D x W x H	12.3"D x 9.25"W x 19"H
Unit Count	1.0 Count
Impedance	8 Ohm
Signal-to-Noise Ratio	7E+1 dB
Number of Audio Channels	1.0
Frequency Response	2.4E+4 Hz
Compatible with Vehicle Type	Car
Compatible Devices	Smartphone, Tablet, MP3 Player, Desktop, Television, Projector, Laptop
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver