Bose | 4.2 Series II | 601™ ii test procedures

601™ ii test procedures
Contents
TECHNICAL DESCRIPTION ............................................................................................................. 2
Specifications ................................................................................................................................... 3
Figure 1. 601™ II Ports .................................................................................................................... 3
601 II Test Procedures ..................................................................................................................... 4
Disassembly/Assembly Procedures .............................................................................................. 5
601 II Part List ................................................................................................................................... 6
Figure 2. Front View ........................................................................................................................ 6
Figure 3. Top View........................................................................................................................... 6
Figure 4. Part 1 (Left) Three Terminal Schematic ........................................................................... 7
Figure 5. Part 2 (Right) Three Terminal Schematic ......................................................................... 7
Figure 6. Two Terminal Schematic ................................................................................................... 8
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.
1
TECHNICAL DESCRIPTION
SPATIAL CHARACTERISTICS
The Bose® 601™ Series II system is a high performance floor-standing speaker designed to
achieve the highest level of spatial realism and spectral accuracy in a non-equalized Direct/
Reflecting® speaker system. The new 601 Series II speaker incorporates two new concepts in
speaker technology: The Free Space® array, which allows the drivers to radiate freely in any
direction, providing exceptionally realistic and natural-sounding energy distributing in almost
any listening room. The second new concept is the Sub-port Enclosure System, figure 1. Each
woofer has its own enclosure that has damping material and a sub-port. The sub-ports are
tuned to operate in the frequency range of 200-300Hz, providing principal sound radiation in
these frequencies through the sub-port rather than the cone. The sub-ports are coupled to the
main port of the speaker, and with the new extended range woofers, tweeters and crossover
network, the 601 II speaker takes maximum advantage of this new technology.
SPEAKER CONFIGURATION
WOOFER: Two new high-efficiency 8" woofers designed for the sub-port enclosure. Each
woofer has a long excursion voice coil and suspension, plus a 14 Oz. magnet, providing high
output capability. Uniform response of the woofer is over 2.5KHz with use of the Dual
Frequency™ crossover network. One woofer is directed forward while the second woofer is
directed upward, which helps create a balance of reflected and direct energy in the listening
room.
TWEETER: Four 3" wide-range high sensitivity tweeters per enclosure provide flat power
radiation beyond 15KHz. The response extends down to 1.5KHz for use with the Dual Frequency crossover network. Two tweeters in each speaker enclosure are directed outward so
that most of the sound energy is reflected off the back and side walls. One tweeter is positioned so that the sound energy is directed towards the center of the room and the final
tweeter is positioned to reflect sound off the back wall between the speakers and into the
room, providing a strong center stereo image by filling the "hole in the middle".
DUAL FREQUENCY CROSSOVER NETWORK: Located in the top woofer cup, the crossover
network consists of two capacitors, two resistors, and two tweeter protection lamps. The Dual
Frequency crossover network is designed to offer performance advantages by deliberately
operating both the woofers and tweeters simultaneously over a significant part of the frequency
range. We have designed the crossover network to have separate transition frequencies for
the woofers and tweeters. By using separate frequencies, an overlap in response of almost
one octave is achieved, providing smoother frequency response in the crossover region.
Careful design of all components in the crossover network matches woofer and tweeter response, eliminating phase cancellation and assuring accurate frequency and transient response.
Enclosure: A sub-port enclosure system for maximum efficiency, minimum cone motion and
placement versatility. Cabinet is constructed of walnut grain vinyl laminated to particle board.
Note: The early version of the 601 II speaker has three input terminals. Later versions had
two input terminals. Refer to the schematics and crossover part lists in this manual for differences.
2
SPECIFICATIONS
Speaker Compliment
Two 8" Woofers per cabinet
Four 3" Tweeters per cabinet
Nominal Impedance
8Ω
Power Requirements
20 watts minimum
150 watts maximum
Major Port Frequency
35HZ
Subport Frequency
Broad band tuning centered at 240HZ
Dual Frequency™ Crossover
Woofer transition frequency: 2.5kHZ
Tweeter transition frequency: 1.5kHZ
Shipping Weight
46 LB per speaker
Speaker Weight
36 LB per speaker
Speaker Dimensions
29.5" H X 14" W X 13" D
Main Ports
Sub-ports
Figure 1. 601 II Ports
3
601™ II TEST PROCEDURES
1. Sweep Test
4. Phase Test
4.1 Momentarily apply 10VDC to the input
terminal of the speaker. Observe the
polarity when connecting the DC supply.
1.1 Apply a 10Vrms, 15HZ signal to the
input terminals of the speaker.
1.2 Sweep the oscillator from 15HZ to
2.5kHZ. There should not be any loud
extraneous noises coming from the woofer.
Note: The woofers are wired in series. If
one woofer is open the other one will not
work.
4.2 The woofer should move outwards with
the momentarily applied DC voltage.
4.3 Visually check the tweeters wiring to
ensure proper phasing.
1.3 Sweep the oscillator from 1.5kHZ to
15kHZ. Replace any tweeter that is inoperative or buzzing.
2. Rub and Tick Test
2.1 Apply a 10Vrms, 25HZ signal to the
input terminals of the speaker.
2.2 No extraneous noises such as rubbing,
scraping or ticking should be heard.
Note: To distinguish between normal
suspension noise and rubs or ticks, displace the cone of the driver slightly with
your fingers. If the noise can be made to go
away or get worse, it is a rub or tick and the
driver should be replaced. If the noise stays
the same, it is normal suspension noise
and it will not be heard with program material.
3. Air Leak Test
3.1 Apply a 10Vrms, 40HZ signal to the
input terminals of the speaker.
3.2 Listen for any whooshing sound coming from the cabinet or around the woofer.
Repair any air leaks.
4
DISASSEMBLY/ASSEMBLY PROCEDURES
1. Grille Removal
5. Tweeter Removal
1.1 Reach behind the top part of the grille
and gently lift up on the grille.
5.1 Perform procedure 1.
5.2 Perform Procedure 3. It is necessary to
remove the woofer to gain access to the
tweeter's service loop. Removing the
woofer will also prevent accidental damage
to the woofer.
1.2 Once the grille has been pulled off of
the four top clips, gently pull the grille away
from the front of the speaker, removing it
from the two clips on the lower part of the
cabinet.
5.3 Remove the screw that secures the
tweeter to the tweeter bracket.
2. Grille Replacement
2.1 Place the top of the grille on the top of
the cabinet so that the four clips on the
grille are aligned with the four grommets on
the cabinet. Press the clips into the grommets so that they snap into place.
5.4 Cut the wires as close to the tweeter
as possible.
Note: Make a note of the wiring configuration.
6. Tweeter Replacement
2.2 Place the lower part of the grille onto
the front of the cabinet so that the clips on
the grille align with the grommets on the
cabinet. Press the clips into the grommets
so that they snap into place.
6.1 Strip the wires and connect them to the
replacement tweeter. Use the schematic on
page 7 and 8 to ensure proper wiring.
6.2 Replace the screw that secures the
tweeter to the tweeter bracket. Pull the
excess wires back into the cabinet and
twist them so that they do not cause a
buzz.
3. Woofer Removal
3.1 Perform procedure 1.
3.2 Remove the four screws that secure
the woofer and the dress ring to the cabinet. Lift the woofer out from the cabinet.
Note: Reuse the dress ring.
7. Crossover Access
7.1 Perform procedure 1.
3.3 Cut the wires as close to the woofer
terminals as possible.
Note: Make a note of the wiring configuration.
7.2 Remove the top woofer.
7.3 The crossover is located under and in
front of the top woofer.
4. Woofer Replacement
4.1 Strip the wires and connect them to the
woofer. Use the schematic diagrams on
page 7and 8 to ensure proper wiring.
4.2 Replace the four screws that secure
the woofer and the dress ring to the cabinet.
Note: The replacement woofer will come
with a dress ring that is not glued to the
woofer. Remove the dress ring from the
replacement woofer and discard it.
5
601 II PART LIST
Item
Number
1
1A
2
3
4
Description
Grille, Side Plastic
Screw, Hex Head
Grille Assembly
Nameplate
Screw, #8 x 30mm
Part
Number
116927
118065-12
115143-1
110009
129027-16
Item
Number
11
12
13
14
15
5
6
7
8
Tinnerman Clip
Gasket, Woofer
Woofer Trim Ring
Woofer 8 Inch
117718
120715
117530
181870-001
16
17
18
19
9
10
Rubber Insert, Grille
Tweeter, 3 Inch
117995
130714
-
Description
Screw, F Tweeter
Screw, R Tweeter
Port Trim Ring
Top Woofer Cup
Gasket, Woofer
Cup
Screw #8-32 x .872
Rubber Foot
Screw, foot
Gasket, Woofer,
Top
Grille Fastener
Part
Number
119095-22
119094-14
117529-1
122101
117717
114986-15
112992
123284-20
118930
117788
CROSSOVER COMPONENTS
Two Terminal
Description
Capacitor, 3.4uF, 5%
Capacitor, 4.0uF, 5%
Capacitor, 3.0uF, 5%
Resistor, 3.9Ω, 15W
Resistor, 3.0Ω, 15W
Resistor, 5.1Ω, 15W
Three Terminals
Description
Part
Number
106825
108980
104130
119094-3R9
119094-3R0
119094-5R1
Tweeter protection Lamp
Capacitor, 6.8uF, 5%
Capacitor, 8.0uF, 5%
Capacitor, 6.0uF, 5%
Resistor, 1Ω, 15W, 5%
Part
Number
114462
115136
115137
109430
102778-1R0
3
1 1A
2
4
5
7
8 19
16
14 15
4
6
7
8
9
10 11 12 20
1A
17 18
13
Figure 2. Front View
Figure 3. Top View
6
RT1
C1
R1
RD
C
A+
RD
YL
+
+
+
LEFT
REAR
TWEETER
FRONT
WOOFER
RIGHT
FRONT
TWEETER
GY
GY
GY
B+
GY
GY
+
+
TOP
WOOFER
GN
+
LEFT
FRONT
TWEETER
R2
RIGHT
REAR
TWEETER
BK
D
ART2
C2
Figure 4. Part 1 (Left) Three terminal Schematic
RT2
C2
R2
RD
A+
C
RD
YL
+
+
GY
+
LEFT
REAR
TWEETER
TOP
WOOFER
RIGHT
FRONT
TWEETER
GY
GY
GY
B+
GY
+
+
FRONT
WOOFER
+
LEFT
FRONT
TWEETER
GN
D
ART1
C1
BK
R1
Figure 5. Part 2 (Right) Three Terminal Schematic
7
RIGHT
REAR
TWEETER
C1
R1
+
RD
+
YL
+
TOP
WOOFER
RD
LEFT REAR
TWEETER
RIGHT FRONT
TWEETER
+
GY
GY
+
+
+
_
GY
LEFT FRONT
TWEETER
FRONT
WOOFER
BK
GN
BK
RIGHT REAR
TWEETER
Figure 6. Two Terminal Schematic
8
9
®
601™ II DIRECT/REFLECTING® SPEAKER SYSTEM
©1996 Bose Corporation
Service Manual
P/N 118915
SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE
®
Bose Corporation
The Mountain
Framingham, Massachusetts USA 01701
Rev 02 to Rev 03; add replacement woofer part number
P/N 118915 3/96: Rev 3 FOR TECHNICAL ASSISTANCE OR PART ORDERS, CALL 1-800-367-4008
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