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 1 
 on: Today at 07:41:18 am 
Started by Bob Faulkner - Last post by Bob Faulkner
You can get a 50A Rac Pac and make yourself a 30 A adapter. Nothing wrong with that. You can even make a 5-15 "Edison" adapter and use it as a $500 outlet strip (with both legs tied together). Just don't get any ideas about making a two-headed Edison cord to get more power, as has been discussed here many times :o -F

Thanks Frank. 

That's what I was hoping for.  Carrying various feeders could be expensive and add yet more weight. 

You are correct, I would never put together a 2-headed Edison!  Those posts were an interesting read.

For the adapters, (i.e. 50amp Rac Pac drawing from a 30amp service), looks like there are pre-made adapters available (barrel types, short-cords)... would these types be acceptable?  Or, would it be best to wire in a plug (each time) that supports the available service?




 2 
 on: Today at 07:12:57 am 
Started by Mike Sokol - Last post by Mike Sokol
I'm now thinking about what I actucally need to demonstrate live in class. While it would be good to show a slide of how delta is converted to wye, and I could probably put test points on this gadget to show primary 3-wire delta voltages, I don't think anyone other than a POCO lineman would ever encounter 3-wire delta. So I think I need a 3-phase load center that I can switch between Wye 208/120 and High-Leg, 4-wire Delta 240/120. Then I could bring a small single phase load center to demonstrate single phase 240/120-volt wiring. For that 1p panel I could use a small 120/240-volt CT transformer fed from my B&K variable AC power supply to demonstrate low and high voltages.

One of the reasons I want some reasonable available load current is I want to demonstrate what you'll see when an undersized neutral is in a system. I first encountered this phenomenon at the Old Mill Inn some 40+ years ago when I noticed that when we fired up 50KW worth of PAR lighting on one of the panel legs, the voltage would drop down to maybe 110 volts, while the voltage on the other unloaded leg in the panel would rise to 130 volts or so. The only reasonable explanation was the neural couldn't support the current unbalance without a significant voltage drop.

Of course I had my lighting tech turn banks of our PAR lights on and off while I measured voltages in the open electrical panel. Not something I recommend to unqualified personnel, but I already had my Master Electrician license at the time and was taking classes for an EE degree, so it was a interesting live experiment.   

 3 
 on: Today at 06:42:41 am 
Started by Jack Arnott - Last post by Chris Grimshaw
We baby boomers

I was born in the 1990s, so I'm not sure I count as a baby boomer  ;)

Chris

 4 
 on: Today at 06:27:50 am 
Started by Mike Sokol - Last post by Mike Sokol
It will make 60 Hz at 1800 RPM only if it has four poles per phase.  This one looks like it a total of 9 windings, so I'm not sure. I guess all I'm saying is you might need some other speed than 1800 RPM.

Yeah, I was trying to count poles and figure out the geometry. The specifications say it has 3 output wires, so it's probably connected up delta. Of course I could use a little variable speed DC motor to spin it at the correct speed, or a small pulley set to change the speed. But it will be easy to figure out once I can spin it. Now all I need is a 4-trace oscilloscope for these experiments. 

 5 
 on: Today at 05:27:12 am 
Started by Patrick Campbell - Last post by Chris Grimshaw
I know a couple of people using Quattrocanali for touring, they claim it works well.

It does, but requires patch panels. They're definitely install amps rather than touring amps, but I can see the appeal.
All I can say is to keep an eye out over the next month or two.

Chris

 6 
 on: Today at 04:16:13 am 
Started by Patrick Campbell - Last post by Helge A Bentsen
I really can't say much at the moment, but if you're thinking of using the install amps for touring, hang fire if you can. Exciting times ahead.

Chris

I know a couple of people using Quattrocanali for touring, they claim it works well.

 7 
 on: Today at 03:56:25 am 
Started by Jack Arnott - Last post by Jeff Bankston
Count to 8 and appreciate !

http://www.youtube.com/watch?v=sj0krLNcYhs

 8 
 on: Today at 03:51:37 am 
Started by Brian Strachan - Last post by Chris Grimshaw
My clients are not asking for really anything yet, so I don't think it'll be an issue. For the stuff we're doing I don't think I should actually be concerning myself with riders.

I will take a serious look at those 218s. I did see that thread, but hadn't fully explored it. The price point of those is certainly very attractive and everything I've read concerning JTR products has been good. I run a PL-380 currently which I believe will meet my needs for some time to come.

Thank you for that recommendation. It's true us EDM guys love the low end and every small system in this area really falls apart below 40hz. If I could get into that lower range, I'd be setting myself apart.

EDIT: Please excuse my ignorance, but can I expect to pay the $1899 "Manufacture direct" price tag, or would that only be for dealers?

Don't worry about riders. If it comes up, tell them you've got this many 21" tapped horns which provide full power to below 30Hz. You'll be fine.

With regards to pricing, why not get in touch with JTR direct? By all accounts the owner is a pleasure to deal with. I believe he does post around here from time to time.

Chris

 9 
 on: Today at 03:49:41 am 
Started by danielball999 - Last post by danielball999
Hi everyone,

I am curious to know if anyone has/is using other manufacturer amplifiers with d&b loudspeaker systems? Would like to get their/your feedback in regards to performance, DSP settings, and any other information with regards to such an application.

Cheers,

Dan.

 10 
 on: Today at 03:48:58 am 
Started by Patrick Campbell - Last post by Chris Grimshaw
Powersoft is a league or few above a DR260. 

Another option are the newer Quattrocanali amps, like the 4804 DSP.  Newer DSP than the K series, lower cost, just not as physically robust.

I really can't say much at the moment, but if you're thinking of using the install amps for touring, hang fire if you can. Exciting times ahead.

Chris

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