TAC Magnum Balancing

[Siegfried Meier]

Hey all!

I'm looking to balance the remaining connections on our Magnum that are unbalanced, which would be the Buss/Direct Outs and the 8 Sends.  I've been looking at the JLM Tardigrade to do that, so we'd need 4 of those to do this.

I'm wondering what the difference between LME49720 vs LM4562 would be in the real world?  Price is about $10 bucks more for the LME49720, but if it's not going to make a difference then I don't see why we'd bother.

I had considered taking the ELCO out of the console and making an external box to keep these in along with a PSU, tuck it under the console...but now I'm wondering if maybe we should just build them into the patchbay and rewire that one buss out/direct out ELCO altogether?  I'm sure the patchbay could use a rewiring anyway...

Thanks for any help!!
Sig

 

[Khron]

Is "active" balancing absolutely necessary? Impedance balancing not good enough?

https://sound-au.com/articles/balanced-2.htm#s1

 

[scott2000]

I'm wondering what the difference between LME49720 vs LM4562 would be in the real world? 

I thought they were identical?

I vaguely recall some having certain issues with the 4562 in the past but am not sure if that was specific to that op amp or both...

Hopefully someone knows the deal...

 

[Tubetec]

Hows about re-using a few surplus high quality 600 ohm line matching transformers ,Haufe's might do the trick very nicely :-{<

 

[Siegfried Meier]

Hows about re-using a few surplus high quality 600 ohm line matching transformers ,Haufe's might do the trick very nicely :-{<

32 of them?  I don't think those will be more cost effective, and they likely won't be as simple and compact as these boards either...

 

[jensenmann]

Which benefits are you expecting from balancing?

 

[Siegfried Meier]

Which benefits are you expecting from balancing?

Level matching with our converters and tape machines mostly. Also reducing hum from long lines.

 

[abbey road d enfer]

I've been looking at the JLM Tardigrade to do that, so we'd need 4 of those to do this.

I've checked the website. Apparently there is no schematic. I can't express an opinon.

 

[abbey road d enfer]

Level matching with our converters and tape machines mostly. Also reducing hum from long lines.

What is the reference level for the Magnum, your tape machine and converters?

 

[Gold]

I'm wondering what the difference between LME49720 vs LM4562 would be in the real world? Price is about $10 bucks more for the LME49720, but if it's not going to make a difference then I don't see why we'd bother.

They are the exact same chip. This was confirmed by someone at TI. There are threads here.

The knock on these IC’s are that they are inconsistent with some having excessive popcorn noise. I think the other knock is that they can be susceptible to RF/EMI.