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.

ASIN	B0040Q51FE
Additional Features	Dynamic 1-inch titanium Linear Travel Suspension horn-loaded tweeter
Age Range Description	Adult
Antenna Location	Music
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo , Surround Sound
Battery Average Life	8 Hours
Best Sellers Rank	#80,222 in Electronics ( See Top 100 in Electronics ) #32 in Floorstanding Speakers #67 in Surround Sound Systems #166 in Bookshelf Speakers
Brand	Klipsch
Built-In Media	Bookshelf Speaker
Color	Black
Compatible Devices	Smartphone, Tablet, MP3 Player, Desktop, Television, Projector, Laptop
Compatible with Vehicle Type	Car
Connectivity Protocol	Jack Connector (3.5mm Audio Jack)
Connectivity Technology	Wired
Control Method	Touch
Controller Type	Corded Electric
Customer Package Type	Standard Packaging
Customer Reviews	4.6 out of 5 stars 258 Reviews
Enclosure Material	Cerametallic
Frequency Response	24000 Hz
Impedance	8 Ohms
Input Voltage	2.83 Volts
Is Waterproof	FALSE
Item Dimensions D x W x H	12.3"D x 9.25"W x 19"H
Item Height	19.1 inches
Item Weight	12.5 Kilograms
MP3 player	No
Manufacturer	Klipsch
Model Name	RB-81 II
Model Number	1011850
Mounting Type	Shelf Mount
Number Of Circuits	2
Number of Audio Channels	1.0
Number of Items	1
Power Source	DC power supply
Series Number	81
Signal-to-Noise Ratio	70 dB
Speaker Maximum Output Power	600 Watts
Speaker Size	8 Inches
Speaker Type	Woofer,Bookshelf, Tweeter
Specific Uses For Product	Indoor, larger rooms, music and movie playback
Subwoofer Connectivity Technology	Wireless
Subwoofer Diameter	8 Inches
Tweeter Diameter	1 Inches
UPC	743878021820
Unit Count	1.0 Count
Warranty Description	Manufacturer
Warranty Type	Limited Warranty
Water Resistance Level	Waterproof
Wireless Technology	Bluetooth
Woofer Diameter	15.5 Centimeters

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

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