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Summary of Contents for JBL D208H
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Page 2: Table Of Contents
For this reason, any current JBL product may diller in some respect from its published description but will always equal or exceed... -
Page 3: Inlroduclion
Excellence is an elusive quality It's so easy to recognize yet so difficult to attain JBL craftsmen have been involved in the art of sound (or more than a generation signal and source, wood and fabric, transducers and acoustics—all of it Today these craftsmen continue to perform to the most rigid standards any craftsman can submit to: those they impose upon themselves. -
Page 4: Power Capacity
There is virtually no danger of damaging a JBL loudspeaker if it is operated within the following guidelines: I) the signal from the amplifier, regardless of its rated power, is not distorted;... -
Page 5: Bass Loudspeakers
(A flat, fiber gasket is supplied with the D208H.) Loudspeakers that can be rear mounted are provided with a facing gasket to form a seal. An airtight seal must also be maintained where the input wires enter the enclosure. - Page 6 Wall M o u n t i n g The D208H and LE8T-H are shallow enough to mount between the studs of most room walls. We recommend that you be certain sufficient depth exists within the wall before cutting an opening.
- Page 7 Installing A Passive Radiator A passive radiator (unclions like a port. II can be used, where battle space permits, to tune an enclosure to very low frequencies by varying the number of weights attached to the cone assembly. A passive radiator should be used only with the specific low frequency loudspeakers for which it is recommended.
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Page 8: Midrange And High Frequency Drivers
Fine Tuning An Enclosure If you are using the detailed plans contained in the JBL Enclosure Construction Kit, follow the porting information provided; it has been validated by the JBL engineering stafl. When constructing an enclosure of your own design, use of the porting chart for home entertainment loudspeakers (included in the JBL Enclosure Construction Kit) will result in excellent bass reproduction. - Page 9 Connection should be made only to the respective mid or high frequency terminals of the recommended JBL frequency dividing network. If separate amplifiers are used for the various components of the system (bi-amplification or tri-amplification).
- Page 10 105 mm Diameter 075,077 Mounting Dimensions 075 Or 077 Installation Install the 077 as shown, lor widest LE21H Mounting Dimensions sound distribution in the horizontal plane.
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Page 11: Horns And Acoustic Lenses
LEI75.LE85 And 376 Compression Drivers A compression driver musi be bolted to the appropriate high frequency horn, which in turn, will be mounted to the baffle panel or freestanding on top of the enclosure. Bolts (%-20. 'Aè' hex head) supplied with the driver should be tightened evenly, and just enough to achieve a snug fit without overtightening. - Page 14 Mounting The HL91, 92 And 93 The lens is affixed to the front surface of the panel with hook-and-pile mounting tape. While the "pile"strips are still attached to the "hook" sections on the lens, remove the paper backing to expose the adhesive, place the lens in position over the baftle cutout, and press the adhesive against the panel.
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Page 15: Frequency Dividing Networks
Frequency Dividing Networks JBL dividing networks provide imperceptible distribution of the audio signal among the transducers of the loudspeaker system. All JBL networks are engineered to match the exact characteristics of specific components, including the horn/lens assembly, as shown in the Network Selection Chart. - Page 16 LX30 and LX300 have Presence (midrange) and LX30 and LX300-Vne Brilliance (high frequency) controls. Rotate the Brilliance control to the minimum position, adjust the Presence control, and then set the Brilliance control. Mounting General application dividing networks are usually mounted on the rear panel of the enclosure.
- Page 17 Network Connection The network input terminals should be connected to the amplifier loudspeaker outputs. Connect the black terminal ot general application networks to the negative amplifier output, and the red terminal to the positive amplifier output Heavy-duty networks are provided with screw terminals The input terminal located on the white line, marked "C"...
- Page 18 System Wiring Illustrations Noie The color codes illustrated represent the latest configuration. Earlier units were supplied with Iwo black wires instead ot green/black and yellow/black wires, and a red wire instead of Ihe yollow wire shown.
- Page 19 Noie The color codes illustrated represent the latest configuration Earlier units were supplied with two black wires instead ol green/black and yeilow/Wack wires, and a red wire instead ol Ine yellow wire shown.
- Page 20 Noto: The color codes illustrated represent the latest configuration. Earlier units wore supplied with two black wires instead ot green/black and yellow/black wires, and a red wire instead of the yellow wire shown.
- Page 21 To The Hefl Input Terminal O! GREEN/BLACK YELLOW ,The N7000 Network ..To Ttie Black Input Terminal Ol The N7000 Network YELLOW/BLACK Note: The color codes illustrated represent the latest configuration. Earlier units were supplied with two black wires instead of green/black and yellow/black wires, and a red wire instead of the yellow wire shown.
- Page 22 GREEN BLACK Y E L L O W BLACK Connect these leads to the primary network, lust as it this network were the high frequency compression driver and horn/lens assembly. Thus, if the fourth termi- nal of the primary net- work would have lieen connected to the red torrrvna! of the com-...
- Page 24 Phase Reversal Switch Install jumpers as shown, using 18-gauge insulated wire. When the switch is in ihe lop position. Ihe top terminals will be energized and the compression driver will be phased as if it were still connected 10 Ihe network. When Ihe swilch is thrown, tho phase of the driver will be reversed.
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Page 25: Service
Service Should a JBL loudspeaker system component require service, return it to the JBL dealer trom whom It was purchased If it is not possible to contact a dealer, write directly to the JBL Service Department describing the difficulty as fully as possible. Products returned to the factory must be sent prepaid to JBL Customer Service, 8500 Balboa Boulevard. - Page 26 James B. Lansing Sound. Inc.. 8500 Balboa Boulevard. Northridge, California 91329 50711 IMLCS-7/S0 Printed >n U.S.A.
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