Model VA305-HF - Shure Vocal Master
222 HARTREY AVE., EVANSTON. l L. 60204
MICROPHONES AND ELECTRONIC COMPONENTS
AREA CODE 312/32~1-9000 CABLE: SHUREMICRO
MODEL ~ ~ 3 0 5 - H F
OPERATION AND SERVICE INSTRUCTIONS
Horizontal Distribution ........120" (see Figure A)
Vertical Distribution ............70"
Dimensions .......................... 172 mm heightX375 mm widthX
224 mrn depth (6% in. X 14%
in. X8% in.)
Weight ..................................5.11 kg (11 Ib, 4 OZ)
Construction ........................ 12.7 mm (1/2 in.) wood, gray vinyl
covering, black grille
Supplied Accessories ........One 1.8m (6 ft), 18-gauge, heavyduty cable with locking phone
Mounting hardware and template
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
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 with Vocal
Master Speaker Columns.
To install the VA305-HF on a Vocal Master Speaker Column, follow these steps:
1. Using template, mark bumper-mounting locations on top
of Column with pointed tool.
2. Mount two bumpers with No. 8 Phillips head screws.
3. Place VA305-HF on Column. Front and side edges
should align with Speaker Column.
4. 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
The VA305-HF is constructed of 12.7 mm (% in.) plywood,
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 1.8m (6 ft) connecting cable with right-angle phone plugs is supplied.
(Program Material) .......... 100 watts max.*
Impedance ............................16 ohms total*
Frequency Response .......... Flat + 5 dB, 5 kHz-18kHz
Crossover Frequency ..........5 kHz
'When used with VA3OO-S Speaker Column.
Copyright 1973, Shure Brothers Incorporated
Printed in 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
REPLACEMENT PARTS LIST
Replacement Kit Consists
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 combined 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.
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 from drivers should be clean and free from buzzes
or rattles, which may indicate driver failure. Replace any
4. Reconnect all disconnected driver leads and replace the
rear panel. Tighten hardware securely to avoid rattles.
IW1 1 I
'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~ppedin RKC quantities.
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, highfrequency 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 produce a sound pressure level (EIA
rating) of 47.5 dB at 9.2m (30 ft) from 1 milliwatt (equivalent
to 95.5 dB at 1 . 2 m 4 ft-with a 1-watt input). Sound distribution 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.
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.
1. Disconnect speaker cables from phone jacks and remove
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 amplifier covering the frequency range from 5,000 to 18,000
(Capacitor, Inductor, Terminal
Jack Panel Assembly with
Diaphragm and Coil Assembi!
Capacitor, Mylar, .47 pF.
lo%, 250 Wvdc
Connector, Phone Jack,
2-Conductor, Open Circuit
Inductor, 1 rnH
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, Hardwarc
Mounting Hardware (bumpers
1.8m (6 ft) Cable Assembly
and Plug Assembly
The Speaker enclosure shall be of 12.7 mm (1/2 in.) plywood 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 1.8m (6 ft)
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 mm
in width, and 224 mm in depth (6% in. X 14% in. X 8% in.).
The weight shall be 5.1 1 kg (11 Ib, 4 oz).
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.
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 purchase date. This guarantee includes all parts and labor.
Carefully repack the unit and return i t 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.