My VTV D300 with WBT NextGen binding posts arrived a few weeks back. Before receiving it, I bought a used Lumin U1 Mini with Sbooster upgrade to get LEEDH digital volume control. My speakers are Zu Audio Soul 6. The Soul 6 doesn't have traditional crossovers but the supertweeter does use a capacitor. The 10" driver is driven "full range".
In my digital based system that is heavily and cleanly power conditioned, the D300 has been very fun for listening. It'a about as good as my DAC and amp I was prior but at much lower cost. I've sold the old amp and the DAC is up for sale. If I were using a preamp, that would also be up for sale.
Because there is not much of an analog path to upgrade, I find myself looking at enhancing the digital chain. I've recently took receipt of an Audio GD DI-20HE DDC and this has improved the sound. It also has SPDIF input which allows me to connect my ADC I use for home theatre. The DI-20HE has a clock input and now I'm waiting for my LHY OCK-1 10MHz clock to ship out.
This past weekend, I completed my first mod to the D300. I switched out the Neutrik RCA SPDIF connector for a Neutrik BNC SPDIF connector. I used solid copper Neotech wires with the return wire in helix formation around the signal wire. I crimped my own dupont connectors on the board end and I soldered the other end to the BNC connector. The BNC connection allows me to remove the BNC-RCA adapters I was using on my SPDIF cable. BTW, the ACSS BNC SPDIF output of the DI-20HE DDC works with the D300. I was afraid they may not be compatible. The next mods are replacing the board to board wires and AC input wires with Neotech wires and then replacing the AC inlet with the Furutech FI-09 inlet. I want to keep all mods reversible but this inlet mod might not allow me to do that.