Electro-Voice MTS-1 User's Manual
Contents
1. hdi EAN So L LLEILCEEEL ve IO psc E SEE CCCI T BA LER E LTEETERS TE EPI 3 do s cr TT FEDT RIZONT a 1 2 2 Ars t Es 1 o ul B j a Beamwidth vs Frequency RESPONSE WITHOUT LA NI E EQUALIZATION UN A T T eee eese A T 30 100 200 E 10 N FIIIT o EQUALIZATION IN RESPONSE 1048 DIRECTIVITY FACTOR R Q DIRECTIVITY INDEX D dB Directivity Factor and FIGURE 5 Directivity Index D vs Frequency Approximate Horn Equalization Specifically the MTS 1 is designed to withstand the power test described in the revised EIA Standard RS 426A The EIA test spectrum is applied for eight hours To obtain the spectrum the output of a white noise generator white noise is a particular type of random noise with equal energy per bandwidth in Hz is fed to a shaping filter with 6 dB per octave slopes below 40 Hz and above 318 Hz When measured with the usual constant percentage bandwidth analyzer one third octave this shaping filter produces spectrum whose 3 dB down points are at 100 Hz and 1200 Hz with a 3 dB per octave slope above 1200 Hz The MTS 1 is a bi amp system so the power handling of each frequency section is treated independently The low frequency section is fed with the spectrum through an a2. NJ 08332 Pro Co Sound Inc 135 E Kalamazoo Ave Kalamazoo MI 49007 Whirlwind Music Distributors Inc P O Box 1075 Rochester NY 14603 The pin arrangements are 1 LF 1 LF 2 HF 2 HF The low frequency drivers are connected directly to inputs and present a nominal 4 ohm load The high frequency drivers have low frequency protection capacitors in series and present a nominal 8 ohm load RECOMMENDED POWER AMPLIFIERS The MTS 1 is a very efficient loudspeaker system This means less amplifier power is needed to achieve a given sound output level It is also capable of withstanding large amounts of input power and transiating it efficiently into large amounts of acoustic output Each system requires two amplifier channels 1 000 watt rms into 4 ohms rating is recommended for the low frequency amplifier 300 watts rms into 8 ohms is recommended for the high frequency amplifier Smaller and larger amplifiers can be used but optimum performanced can be achieved with the above MULTIPLE USE It is possible to parallel more than one MTS 1 cabinet using the two Neutrik Speakon connectors on the input panel Care should be taken when doing this Connecting too low an impedance to amplifiers can damage them see amplifier specifications It should be noted that it is possible to parallel either of the two frequency bands independently of the other For example two high frequency sections could be connecte
3. at the complete V3 octave bands is shown in Figure 3 R Q and the directivity index D are plotted in Figure 4 POWER HANDLING CAPACITY To our knowledge Electro Voice was the first U S manufacturer to develop and publish a power test closely related to real life conditions First we use a random noise input signal because it contains many frequencies simultaneously just like real voice or instrument program Second our signal contains more energy at extremely high and low frequencies than typical actual program adding an extra measure of reliability Third the test signal includes not only the overall long term average or continuous level which our ears inter pret as loudness but aiso short duration peaks which are many times higher than the average just like the actual program The long term average level stresses the speaker thermally heat The instantaneous peaks test mechanical reliability cone and diaphragm excursion Note that the sine wave test signals sometimes used have a much less demanding peak value relative to their average level in actual use long term average levels exist from several seconds on up but we apply the long term average for several hours adding another extra measure of reliability HORIZONTAL VERTICAL D WEG LEID E FIT Ll TEA a TT Lu dua RE EE ule 579 L3 L5 LLEZ3 e rur yr tr aay 8
4. SPECIFICATIONS Frequency Response 10 Feet on Axis Swept 4 Octave Half Space Anechoic Environment see Figure 1 53 20 000 Hz Low Frequency 3 dB Down Point 53 Hz Usable Low Frequency Limit 10 dB down point 47 Hz Efficiency LF HF 5 0 25 Long Term Average Power Handling Capacity per EIA Standard RS 426A see Power Handling section LF HF 600 150 watts Maximum Long Term Midband Acoustic Output LF HF 30 0 37 0 watts Sound Pressure Level at One Meter One Watt Input Anechoic Environment Band Limited Pink Noise Signal LF HF 99 110 d Dispersion Angle Included by 6 dB Down Points on Polar Responses Indicated a Octave Bands of Pink Noise 600 18 000 Hz Horizontal see Figure 3 90 15 15 1 250 18 000 Hz Vertical see Figure 3 40 25 59 Directivity Factor Rg Q 500 20 000 Hz Median see Figure 4 10 7 11 2 8 7 Directivity Index D 500 20 000 Hz Median see Figure 4 10 3 42 7 7 2 Distortion 0 1 Full Power Input Second Harmonic 100 Hz 2 1 000 Hz 5 5 10 000 Hz 10 0 Third Harmonic 100 Hz lt 2 1 000 Hz lt 2 10 000 Hz 2 Distortion 0 01 Full Power Input Second Harmonic 100 Hz lt 1 1 000 Hz 2 10 000 Hz 3 5 Third Harmonic 100 Hz lt 2 1 000 Hz lt v2 10 000 Hz lt 1 Transducer Complement High Frequency Two DH1A variant compression drivers h freque 419 gt 909 4 Low Frequency Two DL15X
5. ch as the SH 1810L ER A crossover in the region of 160 Hz with a slope of at least 12 dB per octave is recommended HORN COMPENSATION High efficiency constant directivity horn driver combinations all exhibit power response rolloff at high frequencies This can be equalized in the MTS 1 in two ways 1 High Level The MTS 1 has switchable Horn Compensation built in With the horn compensation switch located on the input panel set to Out no equalization is present With the switch set to In broad band HF equalization is inserted into the circuit to produce a flat response 2 Low Level a An Electro Voice crossover for example the XEQ 3 and XEQ 2 with hom equalza tion module EQR The Horn Compensa tion Switch should be set to Out b A one third octave equalizer see Figure 5 Combinations of the above methods are also possible CONNECTIONS The MTS 1 is equipped with Neutrik Speakon NL4MPR connectors Two connectors are installed in parallel allowing additional MTS 1s to be installed One mating Neutrik Speakon connector NL4FC is supplied with each system These connectors are locking self polarizing and capable of 30 amps rms continuously Additional connectors and cables can be purchased from your dealer If you experience any difficulty in obtaining cables connectors or wiring accessories the following companies can be contacted Neutrik USA Inc 1600 Malone Street Millville
6. d in parallel while driving their low frequency sections independently ENCLOSURE CONSTRUCTION The MTS 1 is constructed to be a portable speaker system It is ruggedly constructed of 34 inch void free plywood Joints are dado cut for superior strength The cabinet is finished with a densely woven abuse resistant black carpet that is both attractive and highly durable An acoustically transparent metal grille protects the manifold chamber and drivers The system can be transported by one person tilting the cabinet back onto the heavy duty metal wheels Recessed handles are positioned to facilitate this The enclosure is completed with metal corners and firmiy secured rubber feet FREQUENCY RESPONSE The two frequency sections of the MTS 1 are significantly different in sensitivities To produce a response similar to Figure 1 it is necessary to correct for absolute levels after the horn compensation has been completed This can be done at any stage in the system but it is recommended that il be done at the power amplifiers to minimize any noise in the system In some circumstances some up to 12 dB of attenuation may be required on the HF section DIRECTIVITY The polar responses of the MTS 1 are shown in Figure 2 at selected s octave bands The polars were measured in EV s large anechoic chamber using octave pink noise The frequencies selected are fully representative of the polar response of the system Beamwidth of the system
7. ish appearance items burned coils or malfunction due to abuse or operation under other than specified conditions including cone and or coil damage resulting from improperly designed enclosures 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 guarantee A list of authorized warranty service agencies is available from Electro Voice Inc 600 Cecil Street Buchanan MI 49107 AC 616 695 6831 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 ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS AT BUCHANAN NEWPORT TN Electro Voice inc 1989 Litho in USA SEVIERVILLE TN GANANOQUE ONT Part Number 531374 951 MARK IV company
8. mplifier with the continuous power set at 600 watts into 3 2 ohms EIA equivalent impedance 43 8 volts true rms A 32 Hz high pass filter was present to minimize excursion outside the pass band The high frequency is fed with the same spectrum through an 800 Hz 24 dB per octave high pass filter into an amplifier with the continuous power set at 150 watts into 5 6 ohms EIA equivalent impedance 29 1 volts true rms Amplifier clipping sets instantaneous peaks at 6 dB above the continuous power or 2400 watt peaks 87 6 volts peak into the low end and 600 watt peaks 58 0 volts peak into the high end This procedure provides a rigorous test of both thermal and mechanical failure modes SUBPASSBAND SPEAKER PROTECTION Below the enclosure tuning frequency 50 Hz cone excursion increases rapidly with little acoustic output It is therefore highly recom mended that a high pass filter be used A 32 Hz 12 dB per octave is sufficient but any frequency up to 40 Hz can be used WARRANTY Limited Electro Voice Speakers and Speaker Systems excluding active electronics are guaranteed tor five 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 fin
9. requency range by controlling the natural band pass characteristics of existing manifold designs The Manifoid Absorber s position shape and acoustic properties contribute towards this control The higher frequencies 800 20 000 Hz are reproduced by two modified DH1A compres sion drivers manifolded on the MTA 22 U S Patent No 4 629 029 and mounted to a special HP940 90 x 40 constant directivity horn The HP series horn U S Patent No 4 685 532 features integral fiberglass and zinc construction for exceptional strength Also featured are beamwidth control vanes special waveguides in the horn throat that correct the very high frequency disper sion anomalies normally associated with other 2 inch throat horns APPLICATIONS The MTS 1 is ideal for situations where accurate high output and wide coverage is needed from a full range compact system such as a band playing different sized venues or for audio visual presentations The wide coverage angle means that an individual MTS 1 can replace two or more conventional loudspeaker cabinets with no loss of audience coverage The system is most suited for medium throw applications BI AMPING Because of its exceptional power handling the MTS 1 must be bi amped An active crossover with a crossover frequency of 800 Hz and a slope of at least 24 dB per octave is required TRI AMPING In larger venues it may be necessary to augment the low frequencies with subwoofers su
10. s Box Tuning Frequency 55 Hz Crossover Frequency 800 Hz Crossover Slope 24 dB per octave minimum Impedance Nominal LF HF 4 ohms 8 ohms Impedance Minimum LF HF 3 1 ohms 5 6 ohms Recommended Amplifier Power see Amplifier Requirements Section HF 150 300 watts LF 500 1 000 watts Flectro Voic e MARK IV company SPL in 68 FIGURE 1 MTS 1 Axial Frequency Response 1 Watt 1 Meter Model MTS 1 Manifold Technology Two Way Full Range Stage Speaker System Input Connections Parallel Neutrik Speakon NL4MPR Use Neutrik Speakon NL4FC for cable included Enclosure Materials and Colors Black carpet cove 34 inch plywood perforated black metal grille Enclosure Dimensions Height 122 0 cm 48 0 in Width 63 5 cm 25 0 in Depth 60 5 cm 23 8 in Shipping Dimensions Height 128 3 cm 50 5 in Width 70 0 cm 27 5 in Depth 67 0 cm 26 3 in Net Weight 82 7 kg 182 Ib e Shipping Weight DESCRIPTION The Electro Voice MTS 1 is inspired by the MT 4 Manifold Technology Cor It delivers extremely high acoustic output cert System from a very compact portable box ency ranges T n permanent and wer frequencies 50 800 H ed by two DL15MTs 27 Of the devic JV efficiency and reduced distortion when compared with conventional direct radiating designs of comparable size The compound manifold chamber extends the usable f
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