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Author Topic: Using a JSD60 in a Drive In Lindsay Morris Expert Film Handler Posts: 233 From: Darlington, WA, Australia Registered: Sep 2002 posted 10-15-2016 04:39 AM                     Impressive looking setup Mark. Would sure rattle things nearby. Could run a big sub woofer at the country DI as not many people close by but could be wasted as most patrons sit in their cars & enjoy the doof doofs that way. Screen is not quite as big as that at only 18M (approx 60 foot)& just had a coat of paint and looks a treat. IF I can work out how to post some pics will do so when I get back.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-16-2016 11:19 AM                     Its worth a try! The thing about the Intersonic subs is that they are servo motor driven, they are also capable of sound levels equivelent to what a jet engine can produce. Here is a little info on Tom Danley who invented servo-drive woofer and a link to Danly Sound Labs. http://www.prosoundweb.com/article/print/in_profile_tom_danley_exploring_the_possibilities_of_audio_technology http://www.danleysoundlabs.com/danley/wp-content/uploads/2012/06/subs.pdf Mark  |  IP: Logged Lindsay Morris Expert Film Handler Posts: 233 From: Darlington, WA, Australia Registered: Sep 2002 posted 10-17-2016 02:59 AM                     Debatable that the wheat farmers of the area would be all that keen for something like those beasts...but one never knows. The Shire CEO is keen to layout an area in front of the first row of speaker poles with artificial turf & some seating & space for others to bring their own & setup a sound system there just for those folk. Could be a bit of a wheeze to be sitting that close to a 18m screen as a mini outdoor cinema with full blown stereo surround sound. The ambience one gets in an outdoor venue with surround is very good & in some movies that are set in large concert venues its just like being there. NO echoes at all as the open air sucks the sound up big time. Even some of the N/S tracks I used to play in my past outdoor venue that were concert hall recorded stuff sounded brilliant. Often had the sound going when doing site mtce & enjoyed listening to stuff like that. After looking a what the JSD60 CAN do it seems highly likely that getting a full on 5.1 sound setup for the very front area is easy enough to do. Have to find a decent means of transmitting the signal down there as I doubt that they would dig up the field just to instal sound cables. Something to keep in the back of the mind IF the CEO raises the subject again.  |  IP: Logged Greg Routenburg Expert Film Handler Posts: 178 From: Toronto, ON, Canada Registered: May 2003 posted 10-19-2016 11:25 AM                     The afterburner works quite well but is really designed to go between a 6 channel audio source like a D2A or a variety of film digital units and the cinema processor. I've worked on an installation with XD10Ps where we inserted the Afterburner between the processor output and the crossover but getting the levels on the output right was a bit tricky. The afterburners were notorious for failing power supplies, specifically the bridge rectifiers, and they would hum to beat the band. The original rectifiers were a little under spec'd. The rectifiers are easy enough to source and replace and they can be beefed up at that time. All just food for thought.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-19-2016 11:38 AM                     I think every rectifier Smart used was under rated. I also had them fail in Panastereo power supplies several times. They used those cheap plastic bridges. Mark  |  IP: Logged David Buckley Jedi Master Film Handler Posts: 525 From: Oxford, N. Canterbury, New Zealand Registered: Aug 2004 posted 10-19-2016 02:50 PM                        Theres as lot of work been done over the years to make subwoofers produce a more directional output, for example see Tech Talk: Building Directional Subwoofer Arrays.  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 10-19-2016 09:04 PM                        I'm not familiar with the rectifiers in the Smart system mentioned. But, theaters are an interesting environment. Our IR panels used to use an external 24VAC transformer. This drove a diode bridge with 400V diodes in the IR panel. On occasion, these 400V diodes would fail. In studying the issue, I found several hundred volt spikes between the transformer secondary and ground when a xenon lamp fired. The external DC supply does not suffer from this issue (or the internal switching supplies in other products). Anyway, spikes can blow diodes, and xenon lamp firing creates a pretty good spike. Harold  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-19-2016 09:42 PM                     Yes! I switched out lots of those wall wort power transformers about 5 or 6 years ago. I don't recall one ever failing though. Mark  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 10-19-2016 10:18 PM                        Thanks Mark! The "wall wart" transformers never failed, but they did do a great job of coupling line transients into the IR panel where the 400V diodes were blown out. I used to manufacture stuff for the broadcast industry where we had 60 Hz transformers driving diode bridges without an issue. But radio and TV stations don't have xenon lamps. I did, however, see a fair amount of lightning damage. That generally took out I/O circuitry instead of the power supply, though. Anyway it's fun trying to analyze failures and figure out what you can do to prevent their recurrence. Harold  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 10-20-2016 03:54 PM                        I just went to 1kv diodes.  |  IP: Logged Lindsay Morris Expert Film Handler Posts: 233 From: Darlington, WA, Australia Registered: Sep 2002 posted 10-24-2016 05:18 AM                     For the time being have "tamed" the FM sound splatter by turning the Input pot well down. Sounds quite good now on what are quite rowdy movies & trailers. Was very helpful having some actual offending content to play through. Shifted the entire sound rack into the cooler zone where the NEC resides as we are quite sure that the rather excessive heat from the uninsulated roof in the other half of the bio box killed the original FM TX. Never ever worried the valve gear in the past but on a 45C day that uninsulated zone is blistering hot when the building is all closed up. 65C easy peasy any hot summers day. Had a few anxious moments after powering up the relocated rack when the JSD60 was refusing to communicate or respond to Playlist cues. After much double checking of the relocated cabling determined that the EPRAD eCNA5 Automation unit has got a real problem & I am getting a headache just trying to read & understand how the thing works. So back up there in a few days time with enough gear to allow the installer to remote in & interrogate the thing with me doing the hands & feet stuff on site. The eCNA5 shows every sign of being OK but things sort of point to an issue with the Serial port from the DSS100 into the eCNA5. Harold has kindly given me a couple of things to check out with the JSD60 as it comes up as "Off Line" when I try to use the normal JSD60 program to access it which is most peculiar. Yet if I go into its IP Address I can get into it by what seems like a roundabout way via the eCNA5 & I can send commands to it & it responds OK. Any command sent via a Playlist does bugger all. Steep learning curve right now. Hopefully once we get the eCNA5 & the JSD60 communicating again I will be able to access the screens on the JSD60 where the signals are mixed down to the L&R output for the FM TX & the Mono ramp speaker output & see exactly whats going on there. Lindsay  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-24-2016 06:59 AM                     The eCNA line expect pins 7&8 (CTS/RTS) to be connected. So be sure to wire them up properly as well as the TX/RX/GD. In the DSS100, set the flow to control to hardware. The eCNA also wants Carriage Return \0D as well as line-feed \0A. Put those in BOTH the "termination" and "reset" fields. The termination one is required since those are the termination characters but if you don't also put them in reset, you'll "miss" the first cue of the power cycle. Dolby's default parameters do not match the eCNA. Make sure you are set to 19200, N, 8, 1. The communication to the JSD60 and the eCNA should be pretty straight forward via Ethernet on the RDIs. Make sure you have the IP set right and are using the correct port number (10001). A JSD60 command should look like this: {jsd60.sys.input_mode}09{2}0d Anything within curly brackets is the text form of the command, everything outside of a curly bracket is a hex character. So, on the above command you have the "jsd60.sys.input.mode" as text which is its command to change the input button. USL uses the [TAB] character to separate commands from arguments so next comes "09" which is the tab character in hex then "2" within curly brackets to select that input button (Digital 8-channel) and finally "0d" which is the termination character of carriage return in hex.  |  IP: Logged Lindsay Morris Expert Film Handler Posts: 233 From: Darlington, WA, Australia Registered: Sep 2002 posted 10-24-2016 05:32 PM                     Steve, Thanks for that info....more stuff to check out but this setup was all working OK in the past & only seems to have gone pear shaped after I had to replace the DSS100 on board battery. Beginning to think that possibly a wire has broken off the DB15 connector on the DSS100 in getting the thing out & back in again. As well looks like a mouse had been wandering around inside the eCNA so have blocked off the rather large hole in the rear of the case. Hopefully the installer will be able to remote in OK & we sort this one out. Lindsay  |  IP: Logged

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