Shure VA305-HF Instruction

222

HARTREY

El-

MICROPHONES AND ELECTRONIC COMPONENTS

AREA

AVE.,

EVANSTON.

CODE

312/32~1-9000 . CABLE:

60204

SHUREMICRO

U.S.A.

DATA SHEET

MODEL

HIGH-FREQUENCY

~~305-HF

SPEAKER

OPERATION AND SERVICE INSTRUCTIONS

120" (see Figure A)

........

............

70"

mm heightX375 mm widthX

172

224 mrn depth in. X8% in.)

5.11 kg (11 Ib, 4

12.7

(1/2

covering, black grille

1.8m

One

........

duty cable with locking phone

plugs

Mounting hardware and template

OZ)

in.) wood, gray vinyl

ft), 18-gauge, heavy-

Phillips head screws.

(6%

in. X 14%

DESCRIPTION

The Shure Model VA305-HF High-Frequency Speaker is an accessory speaker designed for use with Shure Vocal Master Speaker Columns. When properly installed and connected, the VA305-HF will extend the frequency range of

the Vocal Master Column to 18,000 Hz, providing a greatly enhanced high-frequency response. Note that the VA305-HF

must be connected in parallel with a Vocal Master Speaker

Column; it is not designed to be driven directly by a Vocal Master or Power Master amplifier. Up to three VA305-HF Speakers may be used with each Vocal Master or Power

Master amplifier.

The VA305-HF employs two horn-loaded, high-frequency

dome drivers and an integral passive 5 kHz LC crossover

network to provide proper frequency balance

Master Speaker Columns.

The VA305-HF is constructed of 12.7 mm

covered with gray vinyl and with a black grille to match the

Vocal Master Column. Two plastic bumpers (supplied) can

be affixed to the top of the Vocal Master Column for temporary mounting of the VA305-HF. These bumpers engage hollow cups in the bottom of the VA305-HF. A mounting template is provided to locate these bumpers.

The VA305-HF rear panel contains two parallel-wired phone

jacks for connection to the Vocal Master Column, and a

cable storage compartment. A heavy-duty ing cable with right-angle phone plugs is supplied.

1.8m

with Vocal

in.) plywood,

ft) connect-

Horizontal Distribution Vertical Distribution Dimensions

Weight Construction

Supplied Accessories

..........................

..................................

........................

INSTALLATION

To install the VA305-HF on a Vocal Master Speaker Col-

umn, follow these steps:

Using template, mark bumper-mounting locations on top of Column with pointed tool.

2. Mount two bumpers with No.

3. Place VA305-HF on Column. Front and side edges should align with Speaker Column.

Connect VA305-HF to Speaker Column with cable supplied.

A heavy-duty cable is supplied with each VA305-HF Speaker. The cable can be stored in the cable compartment on the back of the VA305-HF. Connect the cable to either of the phone jacks on the back of the VA305-HF and twist the phone plug downward, locking it behind the black bar. Connect the other end of the cable to either of the phone jacks on the back of the VA300-S Speaker Column. If both of the Speaker Column jacks are being used, disconnect one of the cables, and connect the VA305-HF cable. The disconnected cable may be connected to the unused phone

jack on the back of the VA305-HF. Note that the phone jacks

SPECIFICATIONS

Power Rating

(Program Material) Impedance Frequency Response

Crossover Frequency

'When

............................

used

with

VA3OO-S

Shure Brothers Incorporated

(ML)

..........

100 watts max.* 16 ohms total*

..........

Flat + 5 dB, 5 kHz-18kHz

..........

5 kHz

Speaker

Column.

FIGURE

Printed

U.S.A.

on the VA305-HF Speaker and the VA300-S Speaker Column are parallel-wired, and the cables may be connected in any sequence.

The Shure Models

VA3OO-C, VA302-C Series and PM300 Series amplifiers are designed to deliver full rated power (100W) to an 8-ohm load. Each VA305-HF Speaker when connected to a

VA3OO-S Speaker Column provides a com-

bined speaker system impedance of 16 ohms. Up to three such

speaker systems (three

VA305-HF's plus three VA300-S's) may be connected to these amplifiers. Speaker loads of less than 5.3 ohms should not be used with these amplifiers. No damage to the speakers or amplifier will occur, but thermal

shutoff of the amplifier may result. NOTE:

When using a VA305-HF with a Shure

VA301-S Monitor Speaker, it should be pointed out that the volume control only affects the VA301-S. Consequently, reducing this control from its maximum setting will result in an imbalance of high- and low-frequency sound.

SERVICE INSTRUCTIONS

Speaker Servicing

1. Disconnect speaker cables from phone jacks and remove rear panel.

2. Unsolder one of the wires connected to the two

high-frequency drivers. Using an ohmmeter, measure the dc resistance of each driver. Each high-frequency driver should measure between 13 and 15 ohms. Readings outside these limits indicate possible failures. Repair or replace

any drivers found defective.

3. If above tests do not locate defective driver, check for voice coil rubbing or binding by driving each driver with a test signal (4V

max.) from a sweep oscillator and am-

plifier covering the frequency range from 5,000 to 18,000

Hz.

WARNING

Sound pressure levels generated by this test may be damaging to your hearing. Aim drivers away from listeners and toward sound-absorbent material (curtains, blanket, etc.). Carefully adjust test signal amplitude to avoid unnecessarily high sound pressure levels for prolonged periods.

Sound from drivers should be clean and free from buzzes

or rattles, which may indicate driver failure. Replace any

defective drivers.

4. Reconnect all disconnected driver leads and replace the rear panel. Tighten hardware securely to avoid rattles.

REPLACEMENT PARTS LIST

Description

11)

rnH

Of:

Assembi!

Hardwarc

Replacement Kit Consists

(Capacitor, Inductor, Terminal A2 A3 C 1 J1, J2

L1 LS1,

MPl

MP2 MP3

IW1

'Parts listed as RKC Kits should be ordered by that kit number. Any

orders received for piece parts where RKC Kit number is shown will be sh~pped in RKC quantities.

9082071

1-1

Board) Jack Panel Assembly with

connectors High-Frequency Driver

Diaphragm and Coil Capacitor, Mylar, .47 pF.

lo%, 250 Wvdc

Connector, Phone Jack,

2-Conductor, Open Circuit

(Switchcraft

Inductor,

High-Frequency Driver (see A

for replacement diaphragm

and coil assembly)

Speaker Enclosure (including

Grille, Rear Panel; without

High-Frequency Drivers, Jack

Panel Assembly, Cable

Compartment Strap,

Mounting Cup

Mounting Hardware (bumpers

and screws)

1.8m (6 ft) Cable Assembly

and Plug Assembly

ARCHITECTS' AND ENGINEERS' SPECIFICATIONS

The High-Frequency Speaker shall be an accessory speaker

designed specifically for use with Shure Vocal Master Speaker Columns. The Speaker shall utilize two horn-loaded, frequency dome radiators (drivers) and an integral 5 kHz passive LC crossover network. Addition of the Speaker shall not affect normal operation of a Vocal Master Speaker Column.

The Speaker shall

rating) of 47.5 dB at to 95.5 dB at

1.2m4 ft-with a 1-watt input). Sound distri-

produce a sound pressure level (EIA

9.2m (30 ft) from 1 milliwatt (equivalent

bution of the Speaker shall be 120" in the horizontal plane and 70" in the vertical plane. Frequency response shall be uniform and peak-free over the range of 5 kHz to 18 kHz.

The Speaker enclosure shall be of 12.7

mm wood construction and covered with gray vinyl with a black grille to match the Vocal Master Speaker Columns. The rear panel of the Speaker shall contain two parallel-wired phone jacks and a cable storage compartment. A plug-in connecting cable and hardware for mounting the Speaker to the top of a Vocal Master Speaker Column shall be supplied. The Speaker shall measure 172 mm in height, 375 in width, and 224 mm in depth The weight shall be 5.1 1 kg (1

(6%

Ib, 4 oz).

in. X 14% in. X 8% in.).

Any Speaker not meeting all of the above specifications

shall be deemed unacceptable under this specification. The

Speaker shall be a Shure Model VA305-HF.

(1/2

1.8m

high-

in.) ply-

ft)

--I

J2 WHT

0.47,uF LI

------------'

COLOR-CODED TERMINAL

FIGURE

LSI

GUARANTEE

This Shure product is guaranteed in normal use to be free from electrical and mechanical defects for a period of one year from the date of purchase. Please retain proof of pur-

LS2

chase date. This guarantee includes all parts and labor.

SHIPPING INSTRUCTIONS

Carefully repack the unit and return it prepaid to the factory. If outside the United States, return the unit to your Authorized Shure Service Center for repair. The unit will be returned to you prepaid.