INSTALLATION MANUAL 4. DIMENSIONAL DIAGRAM MATCHING TRANSFORMER MT-S0301 Never connect to a 170 Ω tap when using the speaker on high impedance 100 V line. Otherwise, heat builds up in the matching transformer, possibly causing a fire. 4-3.5 x 5 (4-0.14 x 0.2) 150 (6) 44 (1.73) 66 (2.6) 1. SAFETY PRECAUTIONS 150 (6) Black Red Speaker (rear) Connector (primary) Connector (secondary: 8 Ω) 5. MOUNTING PROCEDURES Indicates a potentially hazardous situation which, if mishandled, could result in moderate or minor personal injury, and/or property damage. Step 1. Remove 4 screws holding the blank panel to the speaker and detach the panel. Notes • The lead wire is connected to 330 Ω tap at the factory. • Make wiring to the tap before installing the transformer into the speaker. Note that the tap cannot be changed from the outside once the transformer has been installed. 2. GENERAL DESCRIPTION Blank panel Machine screw (M4) The following table shows usable impedance. Primary impedance High impedance 100 V line High impedance 70 V line 170 Ω Unusable 30 W 330 Ω 30 W 15 W 1kΩ 10 W 5W • Install the unit in the specified speaker, as doing otherwise may cause the matching transformer or the speaker to heat, resulting in a fire. • Leave the installation of the unit to your TOA dealer because the installation requires expert experience and skills. Incorrect wiring may cause the equipment to heat, resulting in fire. • Avoid connecting to a 170 Ω tap when using the speaker on high impedance 100 V line. Otherwise, heat builds up in the matching transformer, possibly causing a fire. Note Take care not to pinch the lead wire between the blank panel and speaker body when replacing the panel. Max. 36 (1.42) instructions in this section for correct and safe operation. • Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or cautions regarding safety. • After reading, keep this manual handy for future reference. CAUTION Step 5. Replace the blank panel with the matching transformer fixed in the speaker. MT-S0301 75 (2.95) • Before installation or use, be sure to carefully read all the CAUTION Unit: mm (inches) 53 (2.09) Thank you for purchasing TOA Matching Transformer. Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment. Step 3. Connect a lead wire to the desired impedance tap. Speaker (rear) Step 6. Attach the impedance indication label to the given place in the speaker nameplate. Select the indication label corresponding to the impedance set in step 3 from 3 different labels. Step 4. Disconnect the lead wire connectors and connect them to the matching transformer. Blank panel 4-1. Pull the lead wire out of the speaker and disconnect the interlocked connectors. Nameplate of the speaker Machine screw (M4) Disconnect the connectors. The MT-S0301 Matching Transformer (rated input: 30 W) is designed to be installed in the speaker and used to convert the low-impedance speaker into the high-impedance version. Impedance indication label sheet (accessory) Speaker 3. SPECIFICATIONS Rated Input Primary Terminal Secondary Terminal Dimensions Weight 30 W High impedance 100 V Line: 330 Ω (30 W), 1 kΩ (10 W) High impedance 70 V Line: 170 Ω (30 W), 330 Ω (15 W), 1 kΩ (5 W) 8Ω 75 (w) x 36 (h) x 53 (d) mm (2.95" x 1.42" x 2.09") 370 g (13.05 oz) Note: The design and specifications are subject to change without notice for improvement. • Accessory Impedance indication label sheet ...................... 1 Step 2. Mount the matching transformer to the back side of the blank panel with the machine screws and nuts attached to the blank panel. Nut (for M3) MT-S0301 4-2. Connect the removed connectors to the connectors from the transformer. Note The above figure shows an example for attaching the indication label of 330 Ω. MT-S0301 Blank panel Machine screw M3 x 10 Blank panel Speaker URL: http://www.toa.jp/ 133-02-00126-00
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