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 for precision

🎵150W RMS power for room-filling sound

🔊97dB sensitivity for loud, clear output

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Description

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

PRECISION CLARITY - Titanium Linear Travel Suspension tweeter with Tractrix Horn tech ensures crystal-clear highs without fatigue.
DEEP DYNAMIC BASS - 8" Cerametallic woofer pumps out rich, distortion-free low frequencies for lifelike music and movies.
POWERFUL PERFORMANCE - 150W RMS / 600W peak delivers immersive audio that dominates larger rooms.
SLEEK SOPHISTICATED - Black woodgrain vinyl veneer blends seamlessly into any modern workspace or living area.
ENERGY EFFICIENT DESIGN - High sensitivity (97dB) means more sound with less power—eco-conscious and wallet-friendly.

The Klipsch Reference RB-81 II is a top-tier bookshelf speaker featuring a 1" titanium horn-loaded tweeter and an 8" Cerametallic woofer, delivering 150W RMS power with 97dB sensitivity. Designed for larger rooms, it combines Klipsch’s proprietary Tractrix Horn technology for precise, distortion-free sound in a stylish black woodgrain cabinet, perfect for professionals seeking premium audio without sacrificing space.

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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S$1150

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to SINGAPORE.

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