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 on: Today at 12:24:42 am 
Started by Timmy Liland - Last post by Luke Geis
Was just looking at kits and BOM's a bit ago for an AA764 build!!!  Hopefully Santa loves me this year :)

 on: Today at 12:16:12 am 
Started by Helge Dr. Bentsen - Last post by Scott Holtzman
I had never designed a console. i took that information from one of the AES sessions i attend. i think it was Bill Whitlock from Jensan Transformers. he measure consoles voltage. as far as Voltage supply and Shielding of the console. and he find some consoles drop on voltage as you add phantom power use. and some even doesn't provide 48V to begin with.

Yoel Farkas.

To my knowledge Jensen makes audio transformers.  I can't imaging a step down transformer for the phantom on each channel.  As John pointed out we don't design consoles but I have worked on quite a bit of gear over the years and sending high voltage all over the chassis seems like an impractical design.

 on: Yesterday at 11:50:01 pm 
Started by atarimad - Last post by Mac Kerr
Hi chaps,

I've joined a Led Zeppelin tribute band

Please go to your profile and change the "Name" field to your real first and last name as required by the posting rules displayed in the header at the top of the section, and in the Site Rules and Suggestions in the Forum Announcements section, and on the registration page when you registered.


 on: Yesterday at 11:25:06 pm 
Started by Craig Leerman - Last post by Scott Holtzman
Hi all,

Have a happy and safe Thanksgiving and holiday season!


Thanks Craig - Hope you shared it with friends and family.

 on: Yesterday at 10:12:04 pm 
Started by Mark Hannah - Last post by Pete Erskine
After re-reading my OP and the responses, perhaps I should have only posted the two images and then asked...

1) Why give different devices different "spacing" parameters?  Tolerances of the product?
2) How are the "spacing" parameters taken into consideration when calculating IMD?
3) How do you figure out the "spacing" parameters for devices?

Mr. Mortensen,

I hope you didn't do all that work just for me.  Thank you.

All of these questions can be answered by... it's personal preferences.  Each software writer determines what kind of spacing is appropriate for each intermod...What works best for each piece of equipment.  I am sure there are tests to quantify the numbers but in reality it's up to you.

I tend to adjust the basic spacing depending on what I am coordinating.

After the IM is calculated all spacing is checked to insure that new frequencies stay at least the specified distance away.

In my video I set all the spacing the same between IAS and WWB for the test and the numbers came out vastly different.  There is no one way to calculate IM.  Each works well within the parameters of it's program.

 on: Yesterday at 09:54:39 pm 
Started by Jerry30 - Last post by Ray Aberle
Can anyone help :-\

No, sorry.

Welcome to the ProSound Forums! You will find a large resource of experience and information here ready to be tapped. However, before *anyone* can assist you, your Display Name does need to be your Real, Full Name. Would you kindly pop back into your Profile and update your Display Name to reflect your Real, Full Name? Once you do, we can address your situation!



 on: Yesterday at 09:21:54 pm 
Started by Timmy Liland - Last post by Bob Leonard
You are correct that the AC30 is not a true class A amp. It is at certain operating points, but in typical use will be running in a class A/B standard.

The high cut is a neat idea really. It just feeds a signal between the polarity inverted sends from the phase splitter tube to the output tubes. The CMR of that signal between the plate signals will null and hence a high cut is created. It is sort of the same idea as a presence circuit. In either case cancellation is used as the base for the circuit.

I'm looking to build a Princeton or Champ based circuit next. Fender cleans just slay.

That's Steve Hurts Princeton Reverb on the top of the Twin Reverb going through final testing. He also bought the 1965 Super Reverb on the floor to the left. He's spoiled.

 on: Yesterday at 09:13:26 pm 
Started by Craig Leerman - Last post by Bob Leonard
And right back at you Craig, and all of the PSW world.

 on: Yesterday at 09:10:38 pm 
Started by Helge Dr. Bentsen - Last post by Bob Leonard
Many phantom voltage mics work fine all the way down to 9V.... There are even accessory phantom PS that use 9V batteries.

Sorry... I spent decades in the trenches, there are a number of factors other than the actual voltage.


Which is what I was about to post JR. Low phantom voltage MAY decrease sensitivity, but even that is doubtful. "Dirty phantom power could only be described as being dirty if there is an A/C voltage present. This could only occur if the power supply is not designed to provide proper rectification or filtering of the incoming A/C. In todays world 48v phantom power is no more than a figure and many, many boards produce far less than a true usable 48v. Also, one or many separate supplies for phantom power will make no difference considering that most mics requiring phantom power will draw less than 50ma.

In addition to the other boards I own I also own a Soundcraft Ui that has been in use for over two years. Like all of the other misstated comments concerning channel noise I'll put the phantom power statement in the same category as the "no headroom" statements that seems to be so popular, especially with people who don't own the board. There is not now, or has there ever been a real problem with the phantom power circuits on the Ui series boards.

Behringer shouldn't be considered when comparing anything to be used for real sound work. Anything could go wrong with a Behringer product at any time for any reason making any case vs Behringer a non subject. Cheap components make for cheap boards.

 on: Yesterday at 08:52:10 pm 
Started by Forest Monroe - Last post by Mike Monte
Rent a sub or drag your passive gear.  What if someone in the audience is thinking of booking you for a private event or wedding?  Damage to your brand could far exceed the cost of a sub.

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