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Lectrosonics D4 System
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<blockquote data-quote="Bennett Prescott" data-source="post: 32817" data-attributes="member: 4"><p>Re: Lectrosonics D4 System</p><p></p><p>Got to use the Lectro stuff again just one week later, at Hartford's annual Riverfest "almost fourth of July" celebration. Five stages on two sides of the CT river running all day, culminating in a fireworks show timed to music. I needed to get program audio throughout the day (for the National Anthem, and then the fireworks music at night) from FOH at the main stage to all the other sites, the furthest being about 3,200 feet away across the river and through some trees. At the same time I needed to get FSK timecode on the other track of the fireworks music CD about 2,000 feet along the river to fire control.</p><p></p><p>Fortunately, I managed to get some adapters to go from the reverse SMA antenna jacks on the D4 transmitter to standard BNC for my coax run and connection to a helical antenna. UNfortunately, due to the D4 operating in the 900MHz band, where there was already some interference in the area, as well as being outside the bandwidth of the available antennas and amplifiers, in field testing I quickly determined that the D4 system wasn't going to work for me this time. I could just barely get a solid signal on the other side of the river, and it wasn't going to hold up for the long throw to the amphitheater site. Too bad, I was really hoping to test the long throw mettle of the system, but I just didn't have the right antennas and amplifier. Ended up doing it with a Sennheiser 2050 transmitter and a bunch of 500 series receivers in the 500MHz band, but that's a story for another thread. The audio quality out of those was a far cry from what I had hoped the D4 system would deliver!</p><p></p><p>[ATTACH]149805[/ATTACH]Fortunately (played this game before?) I needed to implement some delay stacks again to extend the coverage of the main system along a long walkway, and out onto a pier. The latter placed speakers just over 100 feet away, but in a place where I would have needed to run over 500' of cable to get there. Enter my convenient cable replacement, the D4 system. Ninety seconds of plugging things together later and I had a strong signal at the delays, and the D4R receiver drove a pair of QSC KW153 speakers directly (into limit all night!). The receiver's output sounded great, I'm sure, and it had plenty of input and output capability to both not get clipped by the FOH mixing console's matrix out and to drive those HPRs to within an inch of their life. How it sounded once it had been run through a tight packed pair of KW153 driven into solid limit I'll leave as an exercise for the reader. I only wish I had several more receivers so I could drop one everywhere I needed a loudspeaker.</p><p></p><p>The next challenge was to deliver program audio to a stage 200' up behind FOH, unfortunately in the opposite direction that my antennas were already pointing. This audio would be running in between bands on that stage, as well as for the national anthem and fireworks, so it was more critical that it sound good. Fortunately I had the "spare" system that Howard had provided, an IFB transmitter and R400a receiver. The IFB transmitter can easily be configured to use Digital Hybrid transmission technology (really, I checked!). The R400a is the same receiver you would get with a TM400 rig, so both parts are capable of delivering measurement quality audio. The IFB transmitter is also able to take a line level input, and it has an XLR input and standard BNC antenna output. The small screen gives plenty of information, and setup (once I remembered to switch the power from "tune" to "transmit"!) was simple, the included whip antennas gave plenty of output for the 200' throw over a concrete stairway. Much easier than running wire, and certainly much easier to take down at the end of the night! If you only need a single channel, this product operates in the 500MHz band so it fit right into a channel I'd already allocated and could have used our directional antennas if I had ended up needing them.</p><p></p><p>Long story short, a bummer that I couldn't do my truly long haul audio with the D4 system, but I found a use for both systems Howard provided anyway and they were simple to use and delivered exceptional audio quality. I hope to get my hands on more of this Lectro stuff ASAP, it's my go-to solution for delays. Thanks to Lectro and Howard for providing it, and Karl for chiming in on this thread. They'll probably be wanting their demo gear back now.</p></blockquote><p></p>
[QUOTE="Bennett Prescott, post: 32817, member: 4"] Re: Lectrosonics D4 System Got to use the Lectro stuff again just one week later, at Hartford's annual Riverfest "almost fourth of July" celebration. Five stages on two sides of the CT river running all day, culminating in a fireworks show timed to music. I needed to get program audio throughout the day (for the National Anthem, and then the fireworks music at night) from FOH at the main stage to all the other sites, the furthest being about 3,200 feet away across the river and through some trees. At the same time I needed to get FSK timecode on the other track of the fireworks music CD about 2,000 feet along the river to fire control. Fortunately, I managed to get some adapters to go from the reverse SMA antenna jacks on the D4 transmitter to standard BNC for my coax run and connection to a helical antenna. UNfortunately, due to the D4 operating in the 900MHz band, where there was already some interference in the area, as well as being outside the bandwidth of the available antennas and amplifiers, in field testing I quickly determined that the D4 system wasn't going to work for me this time. I could just barely get a solid signal on the other side of the river, and it wasn't going to hold up for the long throw to the amphitheater site. Too bad, I was really hoping to test the long throw mettle of the system, but I just didn't have the right antennas and amplifier. Ended up doing it with a Sennheiser 2050 transmitter and a bunch of 500 series receivers in the 500MHz band, but that's a story for another thread. The audio quality out of those was a far cry from what I had hoped the D4 system would deliver! [ATTACH=CONFIG]149805.vB5-legacyid=1719[/ATTACH]Fortunately (played this game before?) I needed to implement some delay stacks again to extend the coverage of the main system along a long walkway, and out onto a pier. The latter placed speakers just over 100 feet away, but in a place where I would have needed to run over 500' of cable to get there. Enter my convenient cable replacement, the D4 system. Ninety seconds of plugging things together later and I had a strong signal at the delays, and the D4R receiver drove a pair of QSC KW153 speakers directly (into limit all night!). The receiver's output sounded great, I'm sure, and it had plenty of input and output capability to both not get clipped by the FOH mixing console's matrix out and to drive those HPRs to within an inch of their life. How it sounded once it had been run through a tight packed pair of KW153 driven into solid limit I'll leave as an exercise for the reader. I only wish I had several more receivers so I could drop one everywhere I needed a loudspeaker. The next challenge was to deliver program audio to a stage 200' up behind FOH, unfortunately in the opposite direction that my antennas were already pointing. This audio would be running in between bands on that stage, as well as for the national anthem and fireworks, so it was more critical that it sound good. Fortunately I had the "spare" system that Howard had provided, an IFB transmitter and R400a receiver. The IFB transmitter can easily be configured to use Digital Hybrid transmission technology (really, I checked!). The R400a is the same receiver you would get with a TM400 rig, so both parts are capable of delivering measurement quality audio. The IFB transmitter is also able to take a line level input, and it has an XLR input and standard BNC antenna output. The small screen gives plenty of information, and setup (once I remembered to switch the power from "tune" to "transmit"!) was simple, the included whip antennas gave plenty of output for the 200' throw over a concrete stairway. Much easier than running wire, and certainly much easier to take down at the end of the night! If you only need a single channel, this product operates in the 500MHz band so it fit right into a channel I'd already allocated and could have used our directional antennas if I had ended up needing them. Long story short, a bummer that I couldn't do my truly long haul audio with the D4 system, but I found a use for both systems Howard provided anyway and they were simple to use and delivered exceptional audio quality. I hope to get my hands on more of this Lectro stuff ASAP, it's my go-to solution for delays. Thanks to Lectro and Howard for providing it, and Karl for chiming in on this thread. They'll probably be wanting their demo gear back now. [/QUOTE]
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