Electro-Voice SH-1800 User's Manual
Contents
1. Elecio Voice FIGURE 1 Frequency Response Model SH 1800 Subwoofer The SH 1800 was designed primarily tor use as a subwooler in Component sound rein forcement systems and to supplement low frequency output of the Electro Voice SH 1810 and SH 1810S systems in the bi amp mode The SH 1800 may also be sed with any of the Electro Voice Stage is line when bi amped with appropriate aclive crossover and power amplifiers USE IN MULTIPLES SH 1800s may be used in multiples to se acoustic output A 6 dB increase in maximum acoustic output occurs when two speaker systems are located side by side For operation at very low trequencies the r s mutually couple acting as one system with twice the effective cone area and power handling capacity of a single system Efficiency 1s doubled by the increas ed cone area to provide 3 dB more output while the doubled power capacity provides the potential for an additional 3 dB gain in maximum acoustic output Mutual coupling occurs when the center to one hal spaced greater than one halt wavelength as would occur if two SH 1800s were widely spaced the level increase 1s limited to the 3 dB input power increase CROSSOVERS AND AMPLIFIERS To achieve optimum performance SH 1800 should be used with an a rossover having a crossover frequency of 0 Hz with a minimum slope of 12 dB per octave The output of the crossover is then connect2. 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 interpret as loudness but also short term peaks which are many times higher than the average just like the actual program The long term average level Ey stresses the speaker thermally neat The instantaneous peaks test mechanica reliability cone and diaphragm excursion Note that the sine wave test signals sometimes used have a much less demand ing peak value relative to their average level In actual use long term average levels exist from several seconds or greater but we apply the long term average for several hours adding another extra measure of reliability Specitically the SH 1800 s designed to withstand the power test described in the 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 ted 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 a spectrum whose 3 dB down points are at 100 Hz and 1 200 Hz with a 3 dB per octave slope above 1 200 Hz This shaped signal is sen
3. SPECIFICATIONS Frequency Response 10 Feet on Axis Swept s Octave Half Space Anechoic Environment see Figure 1 48 250 Hz Low Frequency 3 dB Down Point 48 Hz Usable Low Frequency Limit 10 dB down point 35 Hz Half Space Reference Efficiency 6 2 Long Term Average Power Handling Capacity per EIA Standard RS 426A see Power Handling Capacity section 400 watts Maximum Woofer Acoustic Output 25 watts Sound Pressure Level at 1 Meter 1 Watt Input Anechoic Environment Band Limited Pink Noise Signal 50 200 Hz 100 dB Dispersion Angle Included by 6 dB Down Points on Polar Responses Essentially omnidirectional Distortion 0 1 Full Power Input Second Harmonic 100 Hz 1 Third Harmonic 100 Hz 0 6 Distortion 0 01 Full Power Input Second Harmonic 100 Hz 0 5 Third Harmonic 100 Hz 0 5 Transducer Complement EVM 18B Pro Line Recommended Crossover Frequency 250 Hz Impedance Nominal 8 ohms Minimum 6 6 ohms Input Connections Parallel 4n phone jaci naralleling of Enclosure Materials and Colors Blaci ain voidtree plyw Dimensions 83 cm 32 8 in high em 24 0 in deep 63 om 24 8 in wide Net Weight 46 ko 102 b Shipping Weight 51 kg 112 Ib DESCRIPTION The Eleciro V O 1s a 400 watt ic oofer sepaker system It es a high quality EVM 18B pro line cabinet ci es the attributes of a unig The result is pur bass from an unusually
4. ed to a power amplifier which drives the speaker system A power amplifier with a rated output between 400 and 800 watts RMS is recommended for optimum performance While it is acceptable to use amplifiers with less output maximum acoustic output will not be achieved SUBPASSBAND SPEAKER PROTECTION Below the enclosure tuning irequency cone excursion increases rapidly Since acoustic output is also falling rapidly there is no advantage in driving the system with signals much below the tuning frequency While such signals may be in the program material they are often extraneous such as from record surface irregularities or a dropped microphone High output subwoofer systems such as the SH 1800 should be pro tected with a 32 Hz high pass filter having 12 dB per octave rolloff Subpassband filters are found in many commercially available crossovers and equalizers such as the Electro Voice XEQ 3 FREQUENCY RESPONSE The SH 1800 frequency response was measured at ten feet using a four volt input in an anechoic chamber and was measured using a swept Ys octave pink noise signal No external equalization was used POWER HANDLING CAPACITY To our knowledge Electro Voice was the first U S manufacturer to develop and publish a power test 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
5. mage 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 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 trom 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 ATM BUCHANAN Mi lL NEWPO T SElectro Vorce inc 1986 W Litho In USA TN ME REDMOND WA ll GANANOQUE ONT salien Part Number 530705 532
6. t to the power amplifier with the continuous power set at 400 watts into the 6 9 ohms EIA equivalent impedance 52 5 volts true RMS Amplifier clipping sets instantaneous peaks at 6 dB above the con tinuous power or 1 600 watts peak 105 volts peak This procedure provides a rigorous test of both thermal and mechanical failure modes ENCLOSURE CONSTRUCTION Intended to be used as a portable speaker system the SH 1800 is ruggedly constructed of 4 inch void iree plywood All joints are dado cut and the cabinet is finished with a densely woven aduse resistant carpet that is both attractive and highly durable Large heavy duty metal corner protectors firmly secured rubber feet and recessed handles complete the picture and ensure that the SH 1800 speaker system s ideally sured for a long and reliable life on the road WARRANTY Limited Electro Voice Speakers and Speaker Systems excluding active electronics are quaranteed for five years trom date of original purchase against malfunction due to defects in workmanship and materials If such maifunc tion occurs unit will be repaired or replaced at our option without charge for materials or labor i delivered prepaid to the proper Electro Voice service facility Unit will be returned prepaid Warranty does not extend to finish appearance items burned coils or malfunction due to abuse or operation under other than specified conditions including cone and or coll da
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