ssssly, thanks for your response. Yeah, I'm surprised my stand-alone tube DAC does not outshine the Onkyo pre/pro unit. I didn't even buy the pre/pro for that purpose.
My DAC experience aside I do expect a dedicated phono preamp should outperform the unit in the Onkyo. That is not the part of the pre/pro I think they would be putting the bucks. Living here in rural Vermont it's not easy to find a way I can try a unit for a simple comparison. But I'll be scheming a way if I can come up with one.
Thanks for tips on improving the D2. I'm going to implement them soon. I am surprised that this old unit works as well as it does. The overhange gauge and test record arrived today. I reset the cartridge using the gauge and my initial out-of-the-box impression is it sounds quite good. Using the cartridge alignment track on test record I hear a large null in mono mode where the L and R signals cancel. There is residual sound though. I have no experience with this and cannot tell how much null I should get. I can use my SPL meter to compare the speaker outputs or possibly use my o-scope. My simple, ear up close sanity check suggests I have the same residual null level at each speaker FWIW. Which seems like a good thing but it's not a quantitative assessment.
Is accurate setting of tracking force important for sonic quality or is it more a factor regarding record wear, skipping. etc.? I can imagine it might be valuable for optimizing the dynamic response of the needle though. I'm just floating the tonearm and setting to 0g and then using the vernier of the counter weight once calibrated to set the tracking force.
The Jordan speakers have been an interesting project. I first was had a pair of Dynaudio Audience 52's, then I replaced those with a used set of Silverline Sonatina I's. The jx92S are my first foray into full range drivers. I first built a set in cheap plywood cabinets my brother and I made. We used that to judge the design. After about two months of listening and moving the port to the back side (instead of the front) I decided the sound was good enough to commit some quality wood to real cabinet. I've been very pleased with the sound from these guys. I ended up blocking the rear port in the process of tuning them to my smallish room (about 14' X 11'). I like experimenting. These were a fun experiment that have now become my reference speakers.