JBL K2 S5800 combination horn in the center, Music imaging is more realistic, loudspeaker system

CHAPTER 2 – THE PROJECT K2 S5800 LOUDSPEAKER: A TRIUMPH IN ACOUSTICS AND TECHNOLOGY

		stable pinpointed stereo image. All
		the sound seems to come from the
		combination horn in the center.
		Music imaging is more realistic
		since the sound appears to emanate
		from one point and not from multiple
		points at different times.
		Project K2 is a constant-angle sys-
		tem without regard to frequency.
		Careful horn design enables the
		loudspeaker to strictly adhere to a
		60° horizontal/30° vertical coverage
Figure 2. Height of K2 S5800 speaker system in relation to listener.		pattern. This Controlled Coverage
		arrangement precisely defines the
The following sections describe	Thanks to the centrally mounted	optimum listening area and mini-
		mizes room effects. At the same
the primary features and compo-	combination horn, both the UHF	time, it provides a generous “sweet
nents of the Project K2 S5800	(ultrahigh-frequency) and HF (high-	spot” for more comfortable critical
loudspeaker system.	frequency) drivers are located at	listening sessions.
The enclosure of the K2 S5800	the ear level of the listener.
is specially designed to transfer	See Figure 2.	THE DUAL 1200FE LOW-
unwanted mechanical energy	The large 3-inch HF transducer	FREQUENCY DRIVERS
away from any acoustically active	allows the two 12-inch woofers to	See Figure 3.
surfaces, virtually eliminating	be crossed over at a frequency low	In order to achieve the lowest pos-
coloration.	enough to eliminate any audible	sible distortion and compression
The massive enclosure, along	effects of their exact location and	along with the high linear excur-
with its specially designed brass	proximity.	sion necessary, the 1200FE is
modular feet, couples directly to	Full image coherency is main-	equipped with a ferrite magnet.
the floor, and the system literally	tained, resulting in an acoustically	As with earlier Project K2 low-
becomes a structural part of its
environment. Any vibration is		Terminal Base
transmitted harmlessly down the			Terminals
channel provided by the ring/		Glass-Filled ABS
			Gold-Plated 5-Way
	Surround
disc axes and into the floor. The			Binding Posts
	EPDM Foam Rubber
SonoGlass combination horn	Pigtail Leads
maintains a smooth energy			Magnet
transmission path.	Silver-Plated
	Cadmium Copper		Ceramic
The Project K2 S5800 transducer/	w/Conex Core
enclosure arrangement represents	Spiders		Polepiece
the best possible balance of the
	Nomex®
various tuning options and avoids			Steel SAE-1008
the mid-bass response buildup	Dust Dome
found in other vented systems.	Paper Pulp		Back Plate
Response works with, rather	Composite		Steel SAE-1008
than against, the effects of	Spider Spacer
“room loading.”	Extruded Aluminum
The unique design of the Project K2	6063		Pole Sleeve
system is the platform for its equally	Trim Ring		Hi-Purity Copper
unique acoustical attributes.	NBR Rubber		Voice Coil
	Frame	Cone Body	Aluminum Ribbon Wire
			ES-1350 on High Temp
		Special Paper
	Cast 380		Fiberglass Former
		Pulp Composite
	Aluminum

Figure 3. Cutaway view of 1200FE low-frequency transducer. 7