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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Klipsch Reference RB-81 II 150W RMS / 600W Peak Bookshelf Speaker - Black - Single Speaker

Product ID: 256910642

Details

Audio output mode
Stereo Sound
Brand
Klipsch
Connectivity technology
Bluetooth
Frequency response
24000 Hz
Speaker maximum output power
600 Watts

🎯1" Titanium horn-loaded tweeter

🎵8" Cerametallic Woofer for deep bass

🔊150W RMS / 600W Peak Power

¥203345

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Description

🎶 Elevate your sound game — because your space deserves legendary audio.

DEEP DYNAMIC BASS - 8-inch Cerametallic woofer produces rich, high-output low frequencies.
SLEEK TIMELESS AESTHETIC - Black woodgrain vinyl veneer complements any modern workspace or living room.
PRECISION SOUND ENGINEERING - Titanium Linear Travel Suspension tweeter ensures crystal-clear highs without fatigue.
EFFICIENT DESIGN LESS ENERGY - High sensitivity (97dB) means louder sound with less power consumption.
POWER THAT COMMANDS ATTENTION - Delivers up to 600W peak power to fill larger rooms effortlessly.

The Klipsch Reference RB-81 II bookshelf speaker combines a powerful 150W RMS (600W peak) output with advanced Tractrix Horn technology and a titanium horn-loaded tweeter for precise, non-fatiguing sound. Its 8-inch Cerametallic woofer delivers deep bass, making it ideal for larger rooms and immersive music or movie experiences. Finished in a stylish black woodgrain veneer, it’s a top-tier choice for professionals seeking premium audio performance in a compact form.

Specifications

ASIN	B0040Q51FE
Additional Features	Dynamic 1-inch titanium Linear Travel Suspension horn-loaded tweeter
Age Range Description	Adult
Antenna Location	For smartphones or tablets, computers, TVs, surround sound systems, music players, DVDs, game consoles
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo, Surround Sound
Best Sellers Rank	#186,974 in Electronics ( See Top 100 in Electronics ) #166 in Bookshelf Speakers
Brand	Klipsch
Built-In Media	Speaker
Color	Black
Compatible Devices	Smartphone, Tablet, MP3 Player, Desktop, Television, Projector, Laptop
Compatible with Vehicle Type	Car
Connectivity Protocol	A
Connectivity Technology	Bluetooth
Control Method	Touch
Controller Type	Button
Customer Package Type	Standard Packaging
Customer Reviews	4.7 4.7 out of 5 stars (260)
EU Spare Part Availability Duration	7 Years
Enclosure Material	Wood
Frequency Response	24000 Hz
Impedance	8 Ohms
Input Voltage	2.83 Volts
Is Waterproof	False
Item Dimensions D x W x H	31.2D x 23.5W x 48.3H centimeters
Item Weight	12.5 Kilograms
MP3 player	No
Manufacturer	Klipsch
Model Name	rb-81
Model Number	1011850
Mounting Type	Shelf Mount
Number Of Circuits	2
Number of Audio Channels	2.0
Number of Items	1
Power Source	Corded Electric
Series Number	81
Signal-to-Noise Ratio	70 dB
Speaker Maximum Output Power	600 Watts
Speaker Size	8 Inches
Speaker Type	Bookshelf
Specific Uses For Product	Indoors, larger rooms, music and movies playback
Subwoofer Connectivity Technology	Wireless
Subwoofer Diameter	8 Inches
Tweeter Diameter	1 Inches
UPC	743878021820
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	8 Inches

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