Author Topic: How to implement a stereo 5-way crossover with the Ultimate-Preamplifier  (Read 253 times)

David Samborsky

  • Analog-Precision
  • Administrator
  • Jr. Member
  • *****
  • Posts: 90
    • View Profile
    • Analog-Precision
Yes with one external stereo DAC with an S/PDIF Optical or Coaxial Input you can easily add an additional two channels to the existing 8-channel line-up for a total of 10 channels of DSP processing. This saves on having to buy an additional preamp to get an extra two channels !!

This setup would typically be used with an existing stereo 4-way speaker system along with an additional two subwoofers to form a stereo 5-way system. Here is a simple Audioweaver setup that implements a 5-way crossover using the dedicated Audioweaver crossover block to do this ;)

For the external DAC I used my trusty EE-MU404 external USB sound interface which also doubles as a stereo DAC that can accept either Toslink or Coax S/PDIF inputs. Because of the maximum sampling rate of the S/PDIF input on the EE-MU404 is 96kHz I had to reduce the internal processing DSP sampling rate to 96kHz however other DAC's maybe able to handle the full 192kHz sampling rate the UP is capable of.

Here are the frequency response measurements from the dScope III using a Toslink feed from the dScopeIII ;) You can use your DAC level control to trim the level or if it doesn't have one you can easily set the level from within Audioweaver ;) The external DAC level can be made to track the master volume automatically so no need to manually adjust the DAC level control when you change the master volume on the Preamplifer. It's all done transparently ;)

« Last Edit: October 26, 2020, 09:21:06 AM by David Samborsky »
The home of the Ultimate-Preamplifier and Ultimate-Amplifier !


  • Newbie
  • *
  • Posts: 7
    • View Profile
Re: How to implement a stereo 5-way crossover on the Ultimate-Preamplifier
« Reply #1 on: October 26, 2020, 05:46:18 AM »
Amazing stuff Dave. Once again something that DEQX or Trinov cannot do.

And once again the test figures are published.