Topic: AT853>Hyperplane 3-wire BB: do I need the 4.7k mod?

[sunjan]

Hi all,

I picked up a 3-wire b-box in the yard sale, and now I need to solder mini-XLRs on my AT853s to connect them.
This BB was built by user loul69, roughly based on the hyperplane schematics: http://taperssection.com/index.php/topic,72994.0.html

I was thinking, would my AT853s benefit from the 4.7k mod, or is this unnecessary for my setup? I'm usually taping fairly loud rock shows in large clubs.

I want to retain versatility with my AT853s, since I've got phantom modules for running them with UA5 instead.
If I introduce the 4.7k mod in the chain, would the performance suffer?

Thanks a lot for any ideas!

The drawing of my BB below.

[Belexes]

With a 3-wire box, I don't think the 4.7k mod is needed at all.

[nameloc01]

That's correct.

[Dede2002]

That's correct.

That's exactly your point on the other thread, remember? If you run 3 wire bb, no mod is needed.
Of course you were correct

[nameloc01]

Yes,I know this. I did misread a bit of info on the other thread.my mistake.
Ya'know..while I have no problem at all with SP, the mass confusion on powering these mics is partly their fault for selling them wired together for a 2w BB, which we all know doesn't cut it for loud shows. They should just sell them as they are supposed to be..a bit more $ or not. I think that,while again...it would be more costly to run them right, it would eliminate people having to mod them,buying mulitple power supplies,fucked up recordings ect. Thank god I corrected mine before I got any fubar'd pulls.
Just my .02.

[Will_S]

Yes,I know this. I did misread a bit of info on the other thread.my mistake.
Ya'know..while I have no problem at all with SP, the mass confusion on powering these mics is partly their fault for selling them wired together for a 2w BB, which we all know doesn't cut it for loud shows. They should just sell them as they are supposed to be..a bit more $ or not.

The thing is, not everyone tapes Tool, or even rock.  For lots of situations (e.g. acoustic music, bluegrass, jazz, classical, even some rock music where the PA isn't being pushed to ear-damaging loudness) the 2 wire powering will not lead to distortion.  And since it is the more sensitive configuration, provided that the music isn't too loud it's a better match to the iffy preamps found in lots of consumer gear like R09s, D8s, and minidiscs.

[nameloc01]

Yeah, if that's all you're doing is soft music,that's cool. But I do both..mostly loud shows though. And its just so much easier to nip in the ass from the start and not have to worry about it,speculate,blah blah,ect. There is nothing worse than a clipped recording.ugh.
FYI.. Apparently AT has stopped making the "power modules" ( or at least the existing versions) and SP is selling their stock of them for 57.00 each (xs2).          So, right now, as far as the AT mics go, this is the best deal to run them correctly. I am ordering a pair tommorrow, will be a very nice addition. I didn't realize until yesterday that not only do they power the mics  themselves, but each one has a (second full size) XLR input so that you can use THEM as phantom adaptors between them mics and a secondary outboard phantom supply. Bad ass as hell.

[sunjan]

With a 3-wire box, I don't think the 4.7k mod is needed at all.

T+, thanks all of you! I knew I read it somewhere...
Connectors successfully soldered tonight, with great help from ghellquist.

[illconditioned]

Yes,I know this. I did misread a bit of info on the other thread.my mistake.
Ya'know..while I have no problem at all with SP, the mass confusion on powering these mics is partly their fault for selling them wired together for a 2w BB, which we all know doesn't cut it for loud shows. They should just sell them as they are supposed to be..a bit more $ or not.

The thing is, not everyone tapes Tool, or even rock.  For lots of situations (e.g. acoustic music, bluegrass, jazz, classical, even some rock music where the PA isn't being pushed to ear-damaging loudness) the 2 wire powering will not lead to distortion.  And since it is the more sensitive configuration, provided that the music isn't too loud it's a better match to the iffy preamps found in lots of consumer gear like R09s, D8s, and minidiscs.

I would argue that three wire power is *always* the correct thing to do.  If you look at the schematic of *any* AT853 series mic, you'll see a source resistor there.  I've traced the AT8533 power modules and inside is a 5.1k resistor.

Remember AT853 mics were never meant to be sold "bare".  They were always sold with some kind of phantom adapter, either permanaently attached, or connected with a miniXLR.  The adapter contains a 5.1k source resistor, a single transistor that drives an output transformer, and possibly one or two more transistors for bass rolloff, etc.

  Richard

[Sunday Driver]

The picture in the first post shows XLR wiring. For mini-XLR, there is no standard, but usually pin 1 is ground, pin 2 is audio, and pin 3 is battery power. If you already have a 3 wire battery box, that is probably how it is setup.