Shure SR106 Specifications download pdf (Page 4)

Connections for Biamplified Operation

When the 701 has been modified for biamplified opera-

tion, each speaker section is designed to operate with

an amplifier capable of delivering 150 watts continuous

(34.6 Vrms, 55V peak) to an 8-ohm load. To biamplify, an

active crossover, such as the Shure Model

SR106, is

required to separate the high and low frequencies. Set

the crossover frequency at 2600 Hz, and connect the

crossover high- and low-frequency outputs to separate

amplifiers, such as the

and B Power Amps of the Shure

Model 700 Power Console. Connect the speaker output

from the low-frequency amplifier to the 701 jack marked

"LOW"; connect the speaker output from the

high-

frequency amplifier to the jack marked "HIGH".

SERVICE INSTRUCTIONS

Diagnosing the Problem

1. Disconnect the speaker cables.

Using an ohmmeter, measure the resistance between

the tip and sleeve of either phone jack. The dc

resistance should be 5.5 to 6.5 ohms. A clicking

sound will be made by a "good" woofer when an

ohmmeter is connected or disconnected.

NOTE: This test checks only the woofer because

the crossover network is between the phone jacks

and the high-frequency driver.

3. For access to the high-frequency driver and cross-

over network, proceed as follows.

Note: This is most easily performed by supporting

the cabinet on its back on a bench with the head of

the large bolt in the upper center of the cabinet back

hanging over the edge.

Unscrew and remove the bolt from the upper

center of the cabinet back.

Pull the horn and driver assembly out until the

crossover network clears the front of the cabinet.

C. Disconnect the black lead that extends from the

crossover to the jack panel. This will permit the

driver to be partially removed from the cabinet.

Note that the crossover and jack panel are still

attached by a red lead. This lead has an insulated

in-line connector. Push back the insulated sleeve

and disconnect the terminals, completely freeing

the horn and driver from the cabinet.

Using an ohmmeter, measure the resistance between

the driver terminals. The dc resistance should be 5

to 7 ohms.

clicking sound will be made by a

"good" driver as described in step

above.

5. If the above tests do not locate the problem, apply

a small ac voltage from an oscillator and amplifier

to each speaker individually. Use approximately 4V,

50 Hz to

kHz for the 15-inch woofer, and approx-

imately 2V, 500 Hz to 15 kHz for the high-frequency

driver. As the test signal frequency is varied, any

erratic buzzes or rattles indicate possible problems.

WARNING

Sound pressure levels generated by this test may

be damaging to your hearing. Aim speakers away

from listeners and toward sound-absorbent material

(curtains, blanket, etc.) Carefully adjust test signal

amplitude to avoid unnecessarily high sound pres-

sure levels for prolonged periods.

6. To reassemble, connect the jack panel leads: black

lead to the crossover terminal with a black lead on

it (outside terminal); reconnect the red lamp lead

from the driver and the red lead from the jack panel.

Slide the sleeve over to insulate the connector.

7. With the crossover facing the top of the cabinet,

replace the driver and horn assembly by inserting

it in the cabinet and firmly tightening the bolt.

Replacing the 15-Inch Woofer or Gaining Access to the

Jack Panel

1. Remove the grille by pulling the two tabs at the top.

2. Remove the eight screws that hold the woofer in

place.

3. Pull the woofer forward out of the cabinet and dis-

connect the red and black leads from the woofer

terminals. The woofer is now free from the cabinet

and can be lifted out and removed. Take care not

to damage the cone nor to break the leads when

performing this operation.

4. Before replacing the woofer, connect the leads: red

lead to the coded terminal.

5. When reassembling, insert the woofer in the cabinet

and tighten the eight previously removed screws.

6. Press the grille back in place.

Replacing the High-Frequency Driver

Remove the horn, driver, and crossover network from

the cabinet as described in step 3 of the section

Diagnosing the Problem.

At the crossover, disconnect the black, white, and

red leads that come from the driver.

3. Unscrew the driver from the back of the horn.

NOTE: The driver diaphragm and coil

(RKC157) and

the overload protection lamps

(RKC166) can be re-

placed. Instructions for replacement are enclosed

with the replacement part kit.

When reassembling, screw the driver to the back

of the horn. The driver should be tightened by hand.

Do not use a wrench or other tools.

5. Connect the black and white driver leads and the

uninsulated red lamp lead to the crossover (see

Figure 4): black lead to the terminal with a black

lead on it (outside terminal); white lead to the termi-

nal with the 9.4

,F capacitor soldered to its center

(other outside terminal); red lead to the center termi-

nal (between the two outside terminals).

6. Reassemble in the cabinet as described in steps 6

and 7 of Diagnosing the Problem.

ACCESSORIES

The following optional accessories are available for

use with the 701 PRO

MASTERTM Speaker System.

A701C Slip-On Protective Cover

a heavy vinyl cover

that provides protection for the speaker. Has cutouts for

the cabinet projections used as carrying handles.

Equipped with a snap-pocket for cable storage.

A112D Wall Mount Swivel Bracket permits

90"

rotation

of the speaker about a horizontal axis, and 120" of

horizontal rotation when mounted on a vertical surface.

Heavy-duty steel construction.

A102A 70-Volt Transformer provides wattage taps of

50, 25, 12, and 6 watts for 70-volt distributed systems,

and impedance taps of 8 and 16 ohms. Mounts easily to

the back of a speaker or convenient surface.

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Shure SR106 Specifications Page 4

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