Electro-Voice MTA-42 User's Manual
Contents
1. WARRANTY Limited Electro Voice Professional Sound Reinforce ment Electronic Components are guaranteed for two years from date of original purchase against malfunction due to defects in workmanship and materials If such malfunc tion occurs unit will be repaired or replaced at our option without charge for materials or labor if delivered prepaid to the proper Electro Voice service facility Unit will be returned prepaid Warranty does not extend to finish appearance items or malfunction due to abuse or operation under other than specified conditions nor does it extend to incidental or consequential damages Some states do not allow the exclusion or limitation of incidental or consequential damages so the above exclusion may not apply to you Repair by other than Electro Voice or its authorized service agencies will void this quarantee A list of authorized service centers is available from Electro Voice Inc 600 Cecil Street Buchanan MI 49107 AC 616 695 6831 Electro Voice Inc 3810 148th Avenue N E Redmond WA 98052 AC 206 881 9555 and or Electro Voice West 8234 Doe Avenue Visalia CA 93291 AC 209 651 7777 This warranty gives you specific legal rights and you may also have other rights which vary from state to state Service and repair address for this product Electro Voice Inc 600 Cecil Street Buchanan Michigan 49107 Specifications subject to change without notice MANUFACTURING PLANTS AT Ml2. SPECIFICATIONS Useful Frequency Range 200 30 000 Hz Recommended Compression Drivers DH1506 DH2305 DH2mt can also be used with 1824M 1824S 1828R 1828T 1829 18297 Recommended Horns HP9040 HP6040 HP4020 HP1240 HPS40 HP640 HP420 HP64 HP94 Physical Connections Entrances 4 1 18 mounting threads Exit Bolt on standard 2 diameter throat 5 diameter mounting flange and four clearance holes for bolts on a 4 diameter bolt circle Bolt heads are captured by molded in detail Mounting Hardware Included 4 driver entrance gaskets 4 20 mounting bolts 4 Ya washers 4 Y 20 nuts Dimensions 12 7 cm 5 0 in 12 7 cm 5 0 in 9 2 cm 3 6 in Weight 1 4 kg 3 1 Ib Shipping Weight 1 9 kg 3 8 Ib DESCRIPTION The Electro Voice MTA 42 is a high performance high frequency device for combining the outputs of four 13 18 threaded drivers into a single 2 inch throat horn The combination of extremely close driver packing complementary positioning and a specially designed reflective insert results in the phase coherent summation performance shown in Figure 1 1 High sound pressure level applications often require the use of multiple horn and driver combinations This results in physically cumbersome arrays and when two or more horns cover the same area it results in destructive interference often referred to as comb filtering This results in a familiar swishing sou
3. BUCHANAN Mi E NEWPORT TN E SEVIERVILLE TN W REDMOND WA E GANANOQUE ONT Part Number 530693 723 Ey ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 Electro Voice Inc 1987 m Litho In U S A a MARK IV company
4. nd when moving through or walking a system with music being played By combining the outputs of four drivers into a single horn the MTA 42 allows extremely high sound pressure levels to be generated by compact cost effective arrays and without destructive interference MECHANICAL CONNECTION Bolts washers and nuts are provided for connecting the MTA 42 to a standard 2 inch throat horn The flange of the MTA 42 is molded to capture the bolt head so installa tion is possible with a single wrench Four Griver entrance gaskets are also provided These should be inserted into the driver entrances before installing the drivers Elecho Voice a MARK IV company FREQUENCY IN HE FIGURE 1 MTA 42 Summation Respanse Manifold Technology Model MTA 42 High Frequency Summation Device Loading four drivers on to a manifold can result in a very heavy assembly When the MTA 42 is used in portable systems with large drivers direct support for the rear of the horn is required ELECTRICAL CONNECTION With four 8 ohm drivers and one amplifier 2 ohm 8 ohm and 32 ohm systems are possible The recommended electrical connections for these three systems are shown in Figure 2 With more amplifiers other wiring arrangements are possible When using multiple amplifiers care should be taken to ensure equal drive voltage across each Griver Patent pending 2 OHM LOAD 8 OHM LOAD 32 OHM LOAD FIGURE 2 Electrical Connections
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