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 1 
 on: Today at 11:30:42 am 
Started by Jeff Schoonover1 - Last post by Jeff Schoonover1
Here is a way to use a patch panel and the same standard speakon cable for both modes, no special cable or adapters necessary.
I have a panel with one speakon mounted that will work just for this.  Like yours (I think, the pic is blurry),  my amp also has channel 1 as a 4-pole, able to output both channels independently, and can also be used for bridge mode with just the positive poles.  I can just use the Channel 1 output and put a piece of tape over Channel 2.  I love the idea of one cable, one connection, no matter what.  I understand the added safety value of what you suggest, as best practice.  Although I'm sure that when cycling through modes, my amp won't engage the circuit if it's shorted.  Not that I've EVER tried this accidentally ;) 
I was wondering when we were going to get to that. It's an insurance policy protecting the CD from accidents like somebody using the wrong cable or a mixup with processing where the low frequencies or a fullrange signal is sent to the CD. It is sized to filter ULF only with a corner frequency well below the active crossover so as to minimize unwanted phase shift.
I figured it was a filter, I didn't think of it for safety.  My tweeter is 16ohms, So something closer to 10uF for a ~1KHz roll-off might be better. 
Depends if you are always using the same 2 channel amp for bi-amp operation or not, if using two separate amp chassis then you may have a problem with that common neutral.
Actually, looking at it, tweeter common to the X-Over can't be done. 2+ becomes negative in bridge mode, so 2- has to be lifted, or it shorts to 2+.
 2- has to have it's own switched route to the tweeter, as it's the only route Channel 2 can complete its circuit in bi-amp mode.  This is what Ivan Beaver was talking about.

 2 
 on: Today at 11:17:46 am 
Started by Steve Litscher - Last post by Steve Litscher
Like new - purchased in November of 2016 and used maybe 15 times at the most. Always stored in a road case in a climate controlled warehouse when not in use.

Includes:
- Qty 1: Enttec DMX USB Pro Mk2 controller (list = $220)
- Qty 2: Enttec Pro2 DMX Breakout cables (list = $25ea)
- Qty 1: Enttec Pro2 3MX + 2MIDI Breakout cable (list = $35)
- Qty 2: Enttec USB-mini to USB-B signal cables

Has current firmware and works perfectly. Needs nothing and is in excellent condition. The breakout cables have never been used and are still factory sealed.

New, you'd spend over $300 for this kit. Yours for $180, shipped to the lower continental US. I can accept PayPal, no extra fees charged. Ships from 53704, or local pick-up is available. Will be willing to deliver this within 1.5 hours of Madison, Wisconsin as well.

Why is it being sold? We switched to Martin-MPC/M-Play and no longer need this.

$180, shipped, firm.

 3 
 on: Today at 11:09:37 am 
Started by Jeff Schoonover1 - Last post by Jeff Schoonover1
Ivan Beaver is correct, I believe.  The problem is that 2+ becomes negative and completes the circuit in bridge mode, and therefore has to be connected to the X-Over negative input at that time.  There will have to be a fifth switch. so that in Bi-Amp mode, 2+ can connect to tweeter +.
 
Since 2+ becomes negative, 1- negative may also need to be lifted in bridge mode, or it may short Channel 1's output back through channel 1(?)

I think my original drawing stands, more or less.  Here's an update.




 4 
 on: Today at 10:58:35 am 
Started by Nathan Riddle - Last post by Riley Casey
Coz if they'd be white dudes they would have asked politely if they could help put it all away right?  You probably want to rethink how this thread might be "too political".

...
 Then these two black guys jump out of the car and run over here."

... That's when I stood-up and the light came on. I yelled at them 'Hey motherf*ckers' and racked my pistol back. Earlier I had grabbed my pistol just in case... well I'm glad I did. Frightened, they said 'oh f*ck' and ran."

...

 5 
 on: Today at 10:50:10 am 
Started by Helge Dr. Bentsen - Last post by John Roberts {JR}
Iíd be curious to know what consoles youíve encountered that have more than one phantom power supply and even more curious to know which consoles have a separate power transformer for each channel.  Does this include separate rectifiers, capacitors and regulators for each channel?  I can remember some old consoles the had local regulators for the power supply rails but not complete local phantom supplies.
Common practice is to use only one phantom PS rail per console, but channels in premium consoles can have individual on/off switches and local RC filtering. Budget consoles routinely use global switch for all channels, and this created problems in the early days of wireless mics when their receivers couldn't handle 48V (modern receivers can).
Iíve got an old Mackie Onyx 2 channel interface that gets its phantom power from a home brew DC-DC circuit, running a fair bit above the audible range.  Apparently earlier versions of the circuit ran *in* the audible range! 

I couldnít use that phantom power with my MacBook because something in the FireWire connection also had a little bit of very high frequency tone on it, which mixed together with the slight tone on the phantom supply produced an audible difference tone. 

Doesnít take much to be audible in a mic preamp.
Mic preamps are not all created equal.... more likely a preamp with poor CMRR at HF... 

Many preamps will include HF filters in their front end, if those filters on the + and - inputs are not identical, common mode HF noise will not be presented equally to both inputs so won't cancel completely.

I repeat there are multiple factors at play. A good preamp should reject common mode noise on the phantom supply whether it's 120Hz or 100kHz, while 100kHz will be harder to scrub.

JR

 6 
 on: Today at 10:41:08 am 
Started by Helge Dr. Bentsen - Last post by Riley Casey
Iíd be curious to know what consoles youíve encountered that have more than one phantom power supply and even more curious to know which consoles have a separate power transformer for each channel.  Does this include separate rectifiers, capacitors and regulators for each channel?  I can remember some old consoles the had local regulators for the power supply rails but not complete local phantom supplies.

 
I don't know about "dirty". but what make sense is, that some consoles have one 48V phantom power supply (even if you have separate select button on every channel. the source is still one power supply) with NOT enough Va on the transformer. causing it to drop voltage as you add microphones or active DI. which will reduce the quality of the Mic/Preamp. Or to begin with, they are not 48V.

Other consoles have separate power (Transformers) for every channel. not causing to drop voltage as you add phantom.

This can be measured with a volt meter.

i hope that helps.

Yoel Farkas

 7 
 on: Today at 10:24:31 am 
Started by Nathan Riddle - Last post by David Allred
It was poor judgement on my part posting my opinion in this matter.
I shall keep my POV on gun use to myself in the future.
Isn't  that like apologizing for calling your girlfriend fat, by saying "I should not have said that, knowing that you love donuts.  I won't  call you fat next time I think it.".

 8 
 on: Today at 10:08:08 am 
Started by Doga Sagun - Last post by David Allred
Doga,
Taking into account Luke's comments, I will correct a typo by Chris.  Where he suggested LR4, he meant LR24.  You probably would have figured it out, but ...just playing safe.

 9 
 on: Today at 09:15:07 am 
Started by Chris Poynter - Last post by Chris Poynter
Thanks for the input everyone. Maybe custom is indeed the way to go.

Hey Debbie, I also use those On-Stage bags for my speaker stands and mic stands and they are fantastic bags. I wish they made one that was just a little bit longer to accommodate my DT-3900L stand.

Hello Jeremy... I live in Colwood... are we neighbours for realz!? I checked out your website for Brown Bear Sound - cool stuff!


 10 
 on: Today at 09:12:31 am 
Started by Helge Dr. Bentsen - Last post by Scott Helmke
Iíve got an old Mackie Onyx 2 channel interface that gets its phantom power from a home brew DC-DC circuit, running a fair bit above the audible range.  Apparently earlier versions of the circuit ran *in* the audible range! 

I couldnít use that phantom power with my MacBook because something in the FireWire connection also had a little bit of very high frequency tone on it, which mixed together with the slight tone on the phantom supply produced an audible difference tone. 

Doesnít take much to be audible in a mic preamp.

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