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There are currently no product reviews.
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I would not plug this machine in without finding a manual like this. In addition to setup and normal operating instructions, it has troubleshooting flowcharts, diagrammed mechanical adjustments, and schematics to beat the band. The tech I hand it to would be thrilled to find solder side PCB diagrams with component outlines superimposed, pinouts for every IC chip, and line drawings of transistors, with labeled legs.
As for printing quality, this may be a copy of a copy, but even the finest print when enlarged is very legible. There is a bit of grayed print over a few pages, as if a wet page were placed over it, but the print is still very legible. If you could borrow an original manual and get it printed and bound for 4 to 6 times the cost, you could get better quality. In that case you wouldn't be here. For price, utility, and availability I am rating this manual highly.
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I received the Manual in a timely manner and it was exactly what I needed.
This is a perfect copy of the Service Manual, The quality is great. I am very
happy. Thank you
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exactly as they say. Within 24 hours the link to the pages and offcourse it was the right service manual. Super and thanks
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The manual was exact the thing that was promised. My old car stereo is working again thanks to the information supplied.
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I PURHASED THIS PRODUCT BECAUSE I WAS HAVING PROBLEMS WITH MY CDR20 HARMAN KARDON RECORDER. WHICH I PURCHASED NEW 12 YEARS AGO. AFTER REVIEWING THE MANUAL, I WAS ABLE TO ADJUST THE TENSIONER IN THE SYSTEM. WORKS LIKE A CHAMP!.
SAVED ME AT LEAST 100.00 WHICH WAS WHAT A SERVICE REPAIR STATION WANTED. GREAT MANUAL EASY TO READ. SPECIALLY AFTER I PRINTED THE PAGES WHICH DEALT WITH MY RECORDER. THANKS A LOT!!!!!!!!
GT1281 12" Woofer � Technical Data
VENTED BOX VOLUME (INCLUDES DRIVER/PORT DISPLACEMENTS) SEALED BANDPASS BOX VOLUME (INCLUDES DRIVER/PORT DISPLACEMENTS)
length = 10.50"
Port
fo = 30.0 Hz
(2) Ports
fo = 60.0 Hz
length = 7.00"
GT1281
(side view)
GT1281
(side view)
diam. = 4"
VBOX = 2.25 ft3 (63.72 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
diameter = 4"
V
REAR (all sides lined with 1-inch fiberglass or fiberfill)
= 1.75 ft3 (49.56 liters)
V
FRONT
= 1.50 ft3 (42.48 liters)
VENTED FREQUENCY RESPONSE @ 2.83 V
100 95 dB In-Car 12 dB LP @ 80 Hz 95
SEALED BANDPASS FREQUENCY RESPONSE @ 2.83 V
100 dB In-Car 12 dB LP @ 80 Hz
90
Out-Of-Car
90
Out-Of-Car
85
85
80
80
75
75
70
70
65
65
60 20 Frequency 50 100 Hz 200 500 1k
C
60 20 Frequency 50 100 Hz 200 500 1k
C
2k
2k
VENTED EXCURSION/GROUP DELAY @ 400 W
20.0 Xd mM T mSec 20 17.5 15 17.5
SEALED BANDPASS EXCURSION/GROUP DELAY @ 300 W
20.0 Xd mM T mSec 40 30
15.0
10
15.0
20
12.5 Group Delay 10
5
12.5 Group Delay
10
0
10.0
0
7.5
-5
7.5
-10
5.0
-10
5.0 Transducer Excursion
-20
2.5
Transducer Excursion
-15
2.5
-30
0.0 20 Frequency 50 100 Hz 200 500 1k
C
-20
0.0 20 Frequency 50 100 Hz 200 500 1k
C
-40
2k
2k
Harman Consumer Group � 250 Crossways Park Drive � Woodbury, NY 11797 � VOICE: 516-496-3400 � FAX: 516-496-4868 � www.jbl.com
 $4.99 GT1281 JBL
Owner's Manual Complete owner's manual in digital format. The manual will be available for download as PDF file aft…
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