Williams Sound 90V User Manual

Size:
589.16 Kb
Download

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

Description:

The TX90 two channel IR transmitter combines modulator and

technology into a single operating unit, which

reduces operating cost and eliminates precious rack space. The

transmitter produces a wide-angleinfrared sig-

nal that concentrates the IR energy efficiently in the listening

Operating on the 2.3-3.8MHz bandwidth, the

TX90 is less susceptible to radio and lighting interference. Each

transmitter can cover up to 28,000 sq ft (2,600

sq m) in single-channeloperation. The coverage area can be easily

by connecting additional TX9 emitters.

A wall/ceiling omnidirectional mount is included, and stand kits

for portable operation.

Applications:

Cinemas • Simultaneous Interpretation • Audio Description • Conferences • Multi-MediaRooms Boardrooms • Courtrooms • Schools • Universities • Churches

WIR TX90 Transmitter:

Dimensions, Weight:

11.25" W x 6.25" H x 2.125" D

x 15.9 cm x 5.4 cm), 1.8 lbs (0.8 kg)

Color:

Black with white legends, black

lens

Power Supply:

Wall Transformer, 24 VAC, 50-60

VA, 3-pinMOLEX Connector

 

North America:

TFP 010,

 

 

Europe:

TFP 027-01,2-

Schuko plug, CE

 

UK:

TFP 027-02,3-

plug, CE

Power Cable:

NEC Class 2 wiring, two-

., 200’ (61m) max. length

Modulation:

FM Wideband, +50kHz deviation

50uS pre-emphasis

Carrier Frequency:

Channel A: Selectable, 2.3/2.8

 

 

Channel B: Selectable, 3.3/3.8

 

Emitter IR Power:

3.5 watts

 

 

Coverage Area:

28,000 ft2 (2,600 m2) in single-

mode when using the RX22-4Receiver

 

18,000 ft2 (1,670 m2) in four-

when using the RX22-4Receiver

 

3,500 ft2 (325 m2) in single-

when using the RX14-2Receiver

 

3,063 ft2 (285 m2) in single-

when using the RX16 Receiver

 

(See coverage area diagrams)

 

Signal-to-NoiseRatio:

>75 dB, +3dB

 

 

Frequency Response:

80 to 15,000 Hz, electrical

 

Total Harmonic Distortion:

Less than .2%, electrical response

 

Compression:

Music preset 1:1, Voice preset 1.

Hearing Assist preset 2:1

Auto Carrier Shut-Off:

20 minute timer shuts off carrier

no audio is present

Fig. 1: TX90 Bottom View:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Indicator:

Red LED

 

Audio Volume Level Controls:

CHA and CHB Input Level, press

28 dB adjustable range

Audio Indicators:

CHA and CHB Audio Level,

flash

Carrier LEDs:

2 green LED carrier “on”

 

Phones Output:

3.5mm TRS headphone jack. CH

B ring on jack, 32 ohm headphone (min)

Application Preset:

Music, Voice, Hearing Assist.

response; Music: Flat; Voice: Mid-range

 

 

 

 

 

boost; Hearing Assist: High

boost

Tone Control:

Press to select, 21 dB adjustable

kHz between low boost/hi-cutand low

 

 

 

 

 

cut/hi boost).

 

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

* 90 days on accessories.

 

©2008, Williams Sound Corp. MCAT 064A

1

 

 

 

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

Fig 2: TX90 Rear View

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Input:

3-PinMolex, 24 VAC,50-60Hz,

 

 

 

 

 

 

 

 

 

Audio Input Connector:

CHA and CHB, 3 wire Phoenix

 

 

 

 

 

 

 

 

 

Input Level:

Balanced or unbalanced, 316

10dBV) nominal, 5.7k input impedance; max

 

 

 

 

 

 

 

input (over volume range) -21to

.

 

 

 

 

 

 

 

 

Baseband Output:

BNC, 50 Ω, for use with TX9 only

 

 

 

 

 

 

 

 

 

Baseband Cable:

RG 58 Coax, BNC connectors,

1000’ (300m) length

Operating Requirements:

0-50ºC (+32°F to 122°F) ambient temperature,non-condensing,non-corrosiveatmosphere

Mounting Kits:

Wall or Ceiling Mount: BKT 024 Omnidirectional mount;

 

 

 

 

 

 

 

Optional: Tripod Stands: SS-11or

 

 

 

 

 

 

 

 

 

Warranty:

5 years on transmitter, 90 days

 

 

 

 

 

 

 

 

 

Approvals:

CE, FCC, RoHS, WEEE

 

 

 

 

 

 

 

 

 

Compatible Receivers:

WIR RX22-4Four-Channel

RX14-2Two-ChannelReceiver,

 

 

 

 

 

 

 

WIR RX16 Two-ChannelReceiver

 

 

 

 

 

 

 

 

 

Notes:

Specifications: Single end input, volume & tone controls at mid point, 1 kHz,

 

 

 

 

 

 

 

“Music” Preset

 

 

 

 

 

 

 

 

 

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

©2008, Williams Sound Corp. MCAT 064A

2

 

 

 

 

SoundPlus® Infrared System •Model WIR SYS 90V

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

®SoundPlus

Fig. 3: Receiver Coverage Area with TX90 Transmitter in Single

Mode

Feet

90

 

 

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

 

Receiver Coverage Area with TX90

 

 

 

 

 

 

 

 

 

 

 

Transmitter in Single Channel Mode

 

70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

 

RX22-4Receiver

Infrared

 

50

 

 

 

 

 

 

 

 

 

 

RX14-2Receiver

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

RX16 Receiver

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

System

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

RX16

 

 

RX14-2

 

 

-10

 

 

 

 

 

 

 

 

 

 

 

 

-20

 

 

 

 

 

 

 

 

 

 

 

 

-30

 

 

 

 

 

 

 

 

 

 

 

 

-40

 

 

 

 

 

 

 

 

 

 

 

Model

 

-50

 

 

 

 

 

 

 

 

 

 

 

 

-60

 

 

 

 

 

 

 

 

 

 

 

 

-70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WIR

 

-80

 

 

 

 

 

 

 

 

 

 

 

 

-90

 

 

 

 

 

 

 

 

 

 

 

Feet

0

10

20

30

40

50

60

70

80

90

100 110 120 130

160

SYS

 

 

 

 

 

 

 

 

 

 

 

 

 

90V

The coverage area for the TX90 will vary depending on

receiver being used. The diagram

above demonstrates the receiver coverage when

single TX90 transmitter in single chan-

 

 

nel mode. Patterns are direct radiation patterns.

 

Note: Reflections of the infrared light from walls,

floors may change these patterns.

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

©2008, Williams Sound Corp. MCAT 064A

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

Fig. 4: 3-DimensionFoot Pattern

The

floods the listening audience with a

 

light pattern as shown here.

The

of the cone shape light leaves a

 

the ground, or "foot print, " and

 

where the strongest receiver

 

will occur.

The

coverage area will vary depending

on

sensitivity of the receiver being used.

 

Figures 3 and 6 to determine how

 

emitters are required for 100% coverage

of

listening area.

To determine the best location for the transmitter, it helps to

the IR transmitter as an invisible

floodlight. You’ll want to aim it so the listeners are “flooded”

the infrared light. The transmitter

should also be positioned high enough so it won’t be blocked

people and other physical obstructions.

See Figure 5 below. Mount the transmitter at least 2 ft. (.61

the audience. Position the transmitter

to face in a slightly downward angle, 20°, that will increase

of the infrared beam.

Fig. 5: Vertical Beam Spread

Minimum Receiver Range When Operating with a TX90 Transmitter in Single Channel Mode

RX22-4Receiver:

 

RX14-2:80' (24 m)

RX16: 70' (21 m)

150' (45 m)

 

 

 

 

 

 

 

(Range)

 

 

 

 

 

 

TX90

 

Center

Of Emitter

Beam

 

 

 

 

 

 

 

 

 

 

 

 

30'

 

 

 

 

SCREEN

6'

 

 

 

 

 

 

 

 

STAGE

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

©2008, Williams Sound Corp. MCAT 064A

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

Maximum Range When Using the RX22-4Infrared Receiver

Fig. 6: Horizontal and Vertical Radiation Polar Plots

HORIZONTAL RADIATION POLAR PATTERNS DISTANCE FROM EMITTER TO 1 nW/sq cm CONTOUR

 

 

 

200

– 90

– 80

 

60

 

 

 

 

 

– 70

 

54

 

180

 

– 60

 

48

 

160

 

– 50

 

42

 

140

 

– 40

 

 

 

 

 

METERS

36

FEET

120

 

 

30

100

 

– 30

 

 

 

 

 

24

 

80

 

– 20

 

 

 

 

 

 

18

 

60

 

 

 

12

 

40

 

– 10

 

 

 

 

 

 

6

 

20

 

 

 

 

 

 

 

0

10

20

30

40

50

60

70

90 80

1 Channel, 1 nW/sq cm (Approx. 28000 sq ft, 2600 sq m)

2 Channel, 1 nW/sq cm per channel (Approx. 18000 sq ft, 1700 sq m)

4 Channel, 1 nW/sq cm per channel (Approx. 11000 sq ft, 1000 sq m)

METERS

6

RADIATION POLAR PATTERNS FROM EMITTER TO 1 nW/sq cm CONTOUR

– 80

– 70

– 60

– 50

– 40

– 30

– 20

– 10

0

10

20

30

40

50

60

70

80

1 Channel, 1 nW/sq cm

2 Channels, 1 nW/sq cm per channel

4 Channels, 1 nW/sq cm per channel

Reflections of the infrared light from walls, ceilings, and

change these patterns.

Important: Remember to point the emitter towards the

audience!

If you’re not getting sufficient coverage with a single,

installed TX90 Transmitter, you may need

to add additional WIR TX90 Transmitters to achieve full

of your listening area. Figures 7a and

7b illustrate how multiple emitters can be used for large

installations.

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

 

©2008, Williams Sound Corp. MCAT 064A

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

Multiple Emitters Installed to Maximize Coverage

Fig. 7a: Overlapping Illumination Patterns to Cover Larger

Areas

TX9

TX9

 

TX9

TX9

Fig. 7a above is a typical example of how multiple emitters Generally it is desirable for the illumination patterns to ing on the infrared receiver being used; refer to Figures 3 required to achieve full coverage of a listening area.

Fig. 7b: Overlapping Illumination Patterns to Cover Larger

to cover larger listening areas.

Note: The coverage area will vary dependdetermine how many emitters are

Areas

 

Coverage Area

TX90

with Single

Transmitter

Coverage Area TX9 with Second Emitter

Added to Same Emission Point (50% increase)

When a TX90 transmitter and TX9 emitter are used at the

emission point in single channel mode, the

overall coverage area increases 50%. When using an RX22-

as a result, the coverage area will

increase to an estimated 42,000 ft2 (3,902 m2); theRX14-2

to 5,250 ft2 (488 m2); the RX16 will

increase to 4,590 ft2 (426 m2).

 

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

 

©2008, Williams Sound Corp. MCAT 064A

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

WIR RX22-4Receiver:

Receiver Style:

Body-Pack,dual-lensdetector,

 

Size:

4.5" L x 2.85" W x 1.2" H (114.3

.4 mm x

 

30.4 mm)

 

Weight:

4.6 oz (130 g) with batteries

 

Color and Material:

Black

 

Lanyard:

3 ft (.91 m), allows receiver to be

around the neck

Operating Temperature:

-10°C to +50° C

 

Battery Type:

2 x AA, alkaline (BAT 001) or

026)

Battery Life:

Alkaline: 60 hours, NiMH: 30 hours/charge

Battery Drain:

25 mA, nominal

 

Charging Contacts:

For use only with CHG 3512

 

Carrier Frequency:

Channel 1: 2.3 MHz, Channel 2: 2

 

 

Channel 3: 3.3 MHz, Channel 4: 3

 

De-Emphasis:

50 uS

 

FM Deviation:

±50 kHz

 

Signal-to-NoiseRatio:

60dB min.

 

Squelch:

Receiver squelches (mutes) at 40

ratio

Frequency Response:

25 Hz to 16 KHz, +1 dB, -3dB,

response

Total Harmonic Distortion:

Less than 1%, electrical response

 

Controls:

ON/OFF/VOLUME: combination thumbwheel knob

 

Channel Selector: four-position

switch

Indicators:

Red LED “ON” indicator, flashes to indicate Low battery

Audio Output Jacks:

3.5 mm stereo mini phone jack

 

 

Accepts 3.5 mm mono or stereo

plug

Audio Output Power:

15 mW max at 32 Ω

 

Acoustic Output:

110 dB SSPL90 w/ EAR 013

 

Sensitivity:

Better than 1 nW/cm2 for 40 dB

-noiseratio

Approvals:

CE, FCC, RoHS, WEEE

 

Warranty:

5 years on receiver, 90 days on accessories

Compatible Headphones/Earphones:

Mono or stereo, 8-32ohms, 3.5

phone plug,

 

HED 021, HED 026, EAR 013, EAR

022, NKL 001

Fig. 8: WIR RX22-4Receiver

Earphone

Channel

Jack

Selector Knob

 

OFF

"On"

On/Off

Indicator LED

Volume Switch

RX22-4Top

RX22-4Front

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

©2008, Williams Sound Corp. MCAT 064A

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WIR RX14-2Receiver

 

 

Receiver Style:

Headset

 

Earpad Size:

2.5" (6.5 cm) diameter, adjustable headband

 

Weight:

6.7 oz (191 g) without batteries

 

Color and Material:

Black, plastic

 

Operating Range:

Up to 3,500 ft2 (325 m2) when using a single WIR TX90 Transmitter

 

Battery Type:

AAA Alkaline batteries (BAT 010)

 

Battery Life:

Alkaline: 50 hours

 

Battery Drain:

25 mA, nominal

 

Controls:

ON/OFF switch

 

 

 

 

 

(2) Thumbwheel volume control knob, left and right

 

 

 

 

 

(1) Frequency push-buttonselector, 2.3 MHz or 2.8 MHz

 

Acoustic Output:

118 dB MAX SSPL90, +/- dB with 6 cc coupler

 

Warranty:

1-yearwarranty (excludes physical damage)

 

Approvals:

CE, RoHS

 

Fig 9: WIR RX14-2Side View

 

Right Earphone

Left Earphone

 

Infrared "Eye"

 

 

 

 

Infrared "Eye"

AAA

 

 

 

 

AAA

Battery

 

 

 

 

Battery

Compartment

 

 

 

 

Compartment

 

OFF

 

 

 

Frequency

 

ON

 

 

 

 

On/Off

 

| |

 

 

Selector: 2.3 MHz

 

 

|| | | | | |||

 

|||| | | | | | ||

 

+

+

or 2.8 MHz

 

Volume

Volume

 

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

©2008, Williams Sound Corp. MCAT 064A

8

 

 

 

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

Bid Specs

WIR TX90 Transmitter

The Williams Sound Corp. WIR TX90 transmitter shall consist of an all-in

modulator and emitter operating on switchable

carrier frequencies of 2.3/2.8 MHz or 3.3/3.8 MHz. The carrier

use 50 kHz deviation and 50µs pre-emphasis.

The transmitter shall have a range of 28,000 ft2 (2,600 m2) in single

when using the RX22-4receiver. The trans-

mitter shall be contained in a metal housing with a durable plastic lens

transmitter shall be convection cooled without

fans. The transmitter shall include an omni-directionalmounting

permanent installations. Additional brackets

shall be available for different mounting options.

 

The transmitter shall provide two channels of selectable carrier

A 2.3/2.8 MHz or CH B 3.3/3.8 MHz. Two trans-

mitters used in tandem shall provide up 4 simultaneous channels.

 

The transmitter shall have two Phoenix connectors on the back for

unbalanced line input. All controls and indi-

cators shall be accessible on the bottom of the panel of the transmitter.

 

The transmitter shall have three application presets: Music, Hearing

and Voice accessible by thumbscrew adjuster.

There shall be a 3.5mm stereo headphone jack for monitoring the

audio before being transmitted.

Two BNC (50Ω) baseband output jacks shall be provided on the back

more coverage needs. The TX9 emitter panels

must be used with the TX90 transmitter via RG58 coax cable.

 

The transmitter shall be powered by an external 24VAC, 50-60Hz, 35VA

supply. The power connector shall be a three

pin Molex type. Additional emitters shall require individual external

supplies.

The transmitter shall be covered by a five-yearwarranty on parts and

transmitter shall be the Williams Sound Corp.

model WIR TX90

 

WIR RX22-4Receiver

 

The receiver shall be a body-packtype with IR detector lens behind

unit. The unit shall have a lanyard for hands-

free operation. The receiver shall have a rotary-typevolume control.

shall operate for 60 hours with two AA

alkaline batteries and for 30 hours per charge with NiMH AA batteries.

receiver shall be charged without battery

removal via charger contacts in the case. A drop-incharger accessory

recharge the batteries in 8 hours when used with

CHG 3512 charger. The receiver shall be housed in an impact resistant

case with a hinged battery door that does not

separate from the receiver. The receiver shall receive 2.3 MHz, 2.8 MHz,

or 3.8 MHz modulated IR signals with 50 µS

de-emphasis.The receiver shall have a 3.5 mm stereo phone jack and accommodatelow-impedancemono or stereo ear-

phones and headphones. The receiver shall accommodate neckloop

couplers. The receivers shall provide 110 dB

SSPL90 output with EAR 013 earbud-typeearphone.

 

The system electrical frequency response shall be 25 Hz to 16 kHz, +1, -3

the signal-to-noiseratio shall be 60 dB. The

receiver shall have CE, FCC, RoHS, and WEEE approval. The receiver shall

by a five-yearparts and labor warranty,

excluding earphones, headphones, batteries and chargers.

 

The receiver shall be the Williams Sound Corp. model WIR RX22-4.

 

WIR RX14-2Receiver

 

The receiver shall be a headset style with IR detectors positioned on

individual earphone. The receiver shall

operate on 2.3 MHz or 2.8 MHz frequency. The receiver shall have an individual rotary-typevolume control on each individual earphone and a on/off selection switch on the right earphone. The receiver shall have a push button frequency selector

to choose between 2.3 MHz or 2.8 MHz operation. The receiver shall

118 dB SSPL90 output, +/- 1 dB, and a signal-

to-noiseratio of 58 dB. The receiver shall operate up to 50 hours when

AAA alkaline non-rechargeablebatteries. The

receiver shall be encased in a black, plastic case. The receiver shall

to 3,500 ft2 (325 m2) when using a single WIR

TX9 Emitter. The receiver shall have CE, RoHS, and WEEE approval and

by a one-yearparts and labor warranty,

not including batteries or accessories.

 

The receiver shall be the Williams Sound Corp. model WIR RX14-2.

 

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

©2008, Williams Sound Corp. MCAT 064A

9

 

 

 

90V SYS WIR Model • System Infrared ®SoundPlus

SoundPlus® Infrared System •Model WIR SYS 90V

D

Contact:

United States

Williams Sound Corp.

10321 W. 70th Street Eden Prairie, MN 55344

Phone: 800-328-6190or952-943-2252Fax:952-943-2174

Web: www.williamssound.com Email: info@williamssound.com

Canada

Thorvin Electronics

2861 Sherwood Heights Dr. Units 36-37Oakville, ONL6J-7K1Canada

Phone: 800-323-6634or905-829-3040Fax:905-829-4196

Web: www.thorvinelectronics.com

United Kingdom

Sound Associates

Keeble House, 81 Island Farm Road

West Molesey, Surrey KT 2SA

United Kingdom

Phone: (44) 020 8939 5900

Fax: (44) 020 8939 5901

Web: www.soundassociates.co.uk

Email: jmurdoch@soundassociates.com

Asia, Australia, Europe, Latin America, South America,

International Sales Department Williams Sound Corp.

10321 W. 70th Street

Eden Prairie, MN 55344 USA Phone: +1 952 224 7791 Fax: +1 952 943 2174

Email: info@williamssound.com Web: www.williamssound.com

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

 

©2008, Williams Sound Corp. MCAT 064A

10