Bose 301 IV Service Manual
301® SERIES IV DIRECT/REFLECTING® SPEAKER SYSTEM
®
©
1996 Bose Corporation
Service Manual
P/N 181850 REV 1
Table Of Contents
BOSE® 301® SERIES IV TECHNICAL DESCRIPTION ............................................................................... 2
SPECIFICATIONS ......................................................................................................................................... 2
DISASSEMBLY/ASSEMBLY PROCEDURES .............................................................................................. 3
1. Grille Removal........................................................................................................................................... 3
2. Woofer Removal/Replacement ................................................................................................................. 3
3. 3" Tweeter Removal/Replacement............................................................................................................3
4. 2" Tweeter Removal/Replacement
5. Remounting the Grille ............................................................................................................................... 4
TEST PROCEDURES.................................................................................................................................... 5
1. Woofer Rub and Tick Test.........................................................................................................................5
2. Woofer Sweep Test ................................................................................................................................... 5
3. Tweeter Sweep Test..................................................................................................................................5
4. Air Leak Test
5. Woofer Phase Test ....................................................................................................................................5
6. Tweeter Phase Test................................................................................................................................... 6
7. Crossover Testing ..................................................................................................................................... 6
Figure 3: 301 Series IV Main Assembly Drawing........................................................................................7
Figure 4: 301 Series IV Packaging Parts Drawing...................................................................................... 8
TABLES
301 Series IV Main Assembly Parts List ....................................................................................................9
301 Series IV Crossover Parts List ..........................................................................................................10
301 Series IV Main Packaging Parts List ................................................................................................. 10
............................................................................................................................................ 5
.......................................................................................................... 3
PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION
OF BOSE CORPORATION WHICH IS BEING FURNISHED ONLY
FOR THE PURPOSE OF SERVICING THE IDENTIFIED BOSE
PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR
OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PURPOSE.
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BOSE® 301® SERIES IV TECHNICAL DESCRIPTION
The BOSE 301 Series IV speaker is a replacement for the 301 Series III and 4.2® Series II
speakers. It is a passive, two-piece (mirror image stereo pair) home loudspeaker in a bookshelf
configuration. The 301 Series IV is designed for use with standard amplifiers, receivers and other
related home audio components.
The 301 Series IV speaker utilizes separate inward and outward firing tweeters to achieve
®
consistent stereo imaging over a broad listening area (Stereo Everywhere
maintaining a spacious sound stage.
Asethetically, the 301 Series IV speaker features molded plastic right and left side caps mounted
to a vinyl covered, particle board enclosure. This construction eliminates the use of edgebanding, and maintains differentation with competitors due to horizontal placement on the
bookshelf.
The sum of all these unique features makes the 301 Series IV speaker capable of reproducing the
wide dynamic range demanded by today’s advanced recordings without strain or loss of clarity.
performance), while
SPECIFICATIONS
Speaker Compliment: One 8" (20 cm) woofer
One 3" (7.6 cm) tweeter
One 2" (5.08 cm) tweeter
Nominal Impedance: 8 Ohms
IEC Power Rating: Min: 10 Watts per channel
Max: 75 Watts per channel
Cabinet: All Black, all Warm Gray or Rosewood
finish w/Black End Caps
Shipping Weight: 27.7 lbs. (12.6 kg) per pair
Speaker Dimensions: 10.25"H x 16.38"W x 9.5"D
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DISASSEMBLY/ASSEMBLY PROCEDURES
Note: Refer to Figure 3 for the following proce-
dures.
1. Grille Removal: Both the front grille (1) and the
side grille (3) are held in place by a snap-fit and
are easily removed by hand. To remove,
CAREFULLY pull the grille away from the
speaker.
2. Woofer Removal/Replacement:
2.1 Remove the front grille as indicated in Proce-
dure 1.
2.2 Remove the 4 screws (11) holding the woofer
(9) in place.
2.3 Lift the woofer out and cut the wires connected
to the woofer terminals as close to the terminals
as possible.
2.4 Strip the wires and connect to the replacement
woofer. Make sure that the Red wire is connected to the positive (+) terminal, both Black
wires are connected to the negative (-) terminal
and both Yellow wires are connected to the
woofer's "dummy" terminal, (no solder joint at
this terminal). Dress or twist wires to prevent
buzzing.
tweeter from the molded bracket portion of the
endcap.
3.4 Cut the wires connected to the tweeter as close
to the tweeter terminals as possible.
3.5 Strip the wires and connect the replacement
tweeter. Make sure the Yellow wire is connected to the positive (+) terminal and the Black
wire is connected to the negative terminal (-).
3.6 Remount the tweeter using the #8-32 screw.
3.7 Remount the woofer using the four #8-11
screws.
4. 2" Tweeter Removal/Replacement: In order to
remove the tweeter it will first be necessary to
remove the woofer from the enclosure.
Note: The positive terminal of the tweeter is
marked with a Red dot.
4.1 Remove the front grille only, as indicated in
Procedure 1.
4.2 Remove the 4 screws that secure the woofer to
the enclosure and lift the woofer away from its
opening.
2.5 Remount the woofer to the cabinet using the
four screws.
3. 3" Tweeter Removal/Replacement: In order
to remove the tweeter it will first be necessary to
remove the woofer from the enclosure.
Note: The positive terminal of the tweeter is
marked with a Red dot.
3.1 Remove both the front and side grilles as
indicated in Procedure 1.
3.2 Remove the 4 screws that secure the woofer to
the enclosure and lift the woofer away from its
opening.
3.3 Remove the #8-32 screw (6) from the back of
the gasket backed tweeter (4) and separate the
4.3 Remove the #8-32 screw from the back of the
gasket backed tweeter (12) and separate the
tweeter from the molded bracket portion of the
endcap.
4.4 Cut the Yellow wire and the lamp lead connected to the tweeter as close to the tweeter
terminals as possible.
4.5 Strip the Yellow wire and connect the replacement tweeter. Make sure the Yellow wire is
connected to the negative (-) terminal and the
lamp is connected to the positive terminal (+).
Note: To replace just the lamp or both the tweeter
and lamp it will be necessary to remove the tweeter
by following procedures outlined in section 4.
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