[HAL]

A new project for after the Infinity Kappa 8 speaker DSP crossover project.  This will be the thread to post as changes are made.

Purchased a used pair of Magnepan 3.6R speakers that are in very good condition.  These have the external passive crossover that splits the bass panel to the midrange panel and ribbon tweeter.  There is an internal passive crossover between the midrange planar and the ribbon tweeter in the speaker.  Will leave that stock to not remove the original socks.

Will treat this as a hybrid design biamped where the bass panel will be directly driven by the amp and the midrange planar and ribbon tweeter amp driven with the dspNexus 2/8 providing the DSP crossover, speaker correction and room bass management for the system.  These will also have two 3x12 open baffle H-Frame subs for low bass.

[HAL]

Found a copy of the MG3.6R crossover schematic for use in the DSP crossover conversion process. 

The passive external crossover and internal crossover are detailed and can be triamped with some simple changes by removing the tweeter attenuator link and connecting to the other side.  This has both the tweeter and midrange crossover grounds tied.  A Class D amp with a BTL output stage would not work for those drivers, but fine for the woofer panels.

[Jeff_From_Michigan]

It'll be interesting to see how this works out.  I have a pair of 3.6R's, and they are easily the best speakers that I've ever owned.  They have been in storage for over 20 years after I downsized my housing, but the itch to bring them out has never gone away completely.

The only problem is that the LRS's give me such a nice slice of the 3.6's sound quality that I'm very happy listening to them (most of the time), therefore hesitant to drag the 3.6's up from the basement... 

Cool project, though. I can't wait to see how it pans out.

[HAL]

I have modified my LRS in this thread to use the dspNexus 2/8 system or the dspNexus 2/4 system.

https://www.audiocircle.com/index.php?topic=191115.0

[Jeff_From_Michigan]

I have modified my LRS in this thread to use the dspNexus 2/8 system or the dspNexus 2/4 system.

https://www.audiocircle.com/index.php?topic=191115.0

Wow, this looks like something WAAAAY above my skill (and patience) level. I wish I was more of a tinkerer and more willing to take on projects/experiments. I am most
definitely neither of the above. But - improving the crossover and having some kind of real binding posts (or tube connectors) would sure be nice. I'll check both threads
out a little more when I get back home from running errands. Thank you!

[HAL]

When I demoed the LRS at CAF2024, the passive crossover was left in place and I did speaker correction with the dspNexus 2/8 and bass management if needed added open baffle modular subs.  That is already complete and no modifications needed.  It makes a huge difference in the sound quality of the speakers.   

Room EQ Wizard is a free program and it can measure your system at your listening position with a calibrated mic, cable and mic stand and the dspNexus.  Once done big improvements in the system sound for listening.  Those are simple to add to the system for use.

My work is included in the system cost, so you get the DSP crossover system with help making the measurements needed.

[HAL]

This is a first try at the 3.6R on-axis frequency response for crossover design.  The DSP crossover design uses this frequency response with the passive XO and with the input from the modeling of the passive crossover schematic.

This also lends itself to triamping the 3.6R's as well.

Once the LRS/LRS+ work is complete will setup the 3.6R's with the MYE stands for testing and listening.  This will be awhile down the road.