K&K Audio / Lundahl Transformers

Welcome! Need support, you got it. Or share youe ideas and experiences.

Return to K&K Audio / Lundahl Transformers

K&K Audio / Lundahl Transformers

Behringer DCX2496 with Lundhal passive output

189.134.14.219

Hello Kevin,

Is it possible to add a passive output transformer stage to the output of the Behringer DCX2496?
It uses the AKM AK4393 dac chip.

There seems to be a lot of fuzz about this thing....
A lot of modders are using passive cap output stages.

Follow Ups:

RE: Behringer DCX2496 with Lundhal passive output - KevinC 16:20:17 09/11/07 (4)
Yes. The AKM DAC is a voltage output DAC, so an output transformer will serve to remove the DC offset and provide galvanic isolation from the DCX2496, which will eliminate coupling capacitors and op amps.

Kevin Carter
K&K Audio
www.kandkaudio.com
- RE: Behringer DCX2496 with Lundhal passive output - nerdorama 18:30:09 09/11/07 (3)
  Kevin,
  
  I have a DEQ2496 also and have wondered about an output transformer connected directly to the output of the DAC chip. Which transformer would you recommend? I've looked a bit through the forum archives and found a mention of LL1544 and LL1690.
  
  Thanks,
  John
  De gustibus non est disputandum
  - RE: Behringer DCX2496 with Lundahl passive output - KevinC 18:32:35 09/11/07 (2)
    Those would be my choices.
    
    Kevin Carter
    K&K Audio
    www.kandkaudio.com
    - RE: Behringer DCX2496 with Lundahl passive output - Saturntube 21:19:51 09/11/07 (1)
      Kevin you mention that the LL1544 is good "from about 200Hz up. " which is "to get 4 or 8 volt output " It seems the AKM 4393 dac chip has a 2.4 vpp output, If the LL1544 is wired 1:1 ratio we would get 4.8 volts output or if we wire 1:2 ratio we get 9 volts.
      Is there a diference in sound having a 1:1 ratio or a 1:2 ratio?
      I have a 150hz mid horn, would the LL1544 get there at 4.8 volts say pusshing it, or should I go for another transformer?
      
      For the Bass Channels would the LL1690 go down to 20 hz?
      
      Would the LL1674 work well here?
      
      Thanks
      - RE: Behringer DCX2496 with Lundahl passive output - KevinC 04:50:25 09/12/07 (0)
        
        In Reply to: RE: Behringer DCX2496 with Lundahl passive output posted by Saturntube on September 11, 2007 at 21:19:51
        
        A little review of level standards is in order here. When I write "4 to 8 volts", I mean rms voltage not peak-to-peak (pp) voltage. 4 to 8 volts rms is about 11.5 to 23 volts pp. 2.4v pp is about 0.85v rms, so the LL1544A will be easily up to the task down to 20Hz. The LL1690 would also be a good choice, but the LL1674 is a higher ratio transformer that would be useful only if you wanted to step the signal up or down by a largeish factor.
        
        Kevin Carter
        K&K Audio
        www.kandkaudio.com

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Signature Sound

[ Signature Sound Lounge ]