With Fyne's explanation, the benefit of +20kHz extension from super tweeters—or standard tweeters of 40-80kHz bandwidth like beryllium, carbon and diamond versions—is lower phase shift in the audible range. Perhaps we can vaguely think of it like an oversampling parallel? By pushing conversion artefacts farther out of band for shallower reconstruction filters, digital upshifted into the bat sphere books benefits in the audible range. It's a simplistic connection but perhaps makes the point that what happens beyond our hearing's threshold can impact what we hear. Ultrasonic noise too happens beyond our ear limits yet filtering it has shown audible benefits. By July 2nd Young Byun checked in with a Korean Post EMS Premium shipping notice with subsequent handover to UPS for the following week; and that Auden Distribution in the UK would subsequently collect my samples. He also mentioned an ill-intentioned YouTube review initiated by a well-meaning dealer which the VC1 had collected in the interim; and even having bought the speaker it was compared to then criticized against. "That floorstander is a very odd design. Its bass is wired up out of phase and its four paralleled drivers connect in series. It has a supposed ambient tweeter which actually processes the same mid/high signal as the frontal driver just aimed backward. Jun and I are baffled why his VC1 was compared to that in the first place and felt particularly bad that this YouTuber called out other video reviewers who had already covered ours rather enthusiastically." Nothing like some controversy to drive traffic to a smaller YouTube channel?
Back on certainties, I asked Young about remaining details. As we just saw, 3½-way mode requires no shot-gun biwire, just a different jumper connection. This avoids a switch to select between filters. However, 3½-way bi-amping is certainly possible. Just omit the jumpers.
"Designer Jun favours the 4-way option with the Beryllium tweeter at H.T2, the 3.5-way at S.T." Below we see the impedance curve where the 25Hz peak is the port resonance, the 50Hz smaller peak the enclosure's resonant frequency. The woofer's fs is 37Hz. The right graph shows the VC1 response in red, the VC2 in grey, their combined response in green.
"In 4-way mode, the VC1 response shelves down by 2dB for more linear summing. 3½-way tuning emphasizes 100Hz mid-bass impact. 4-way tuning is more linear and reduces distortion. In small or low-loss concrete rooms, Jun recommends slight toe-in for the 4-way/H.T2 combo to minimize distortion and deliver a clean high-end sound. 3½-way mode works exactly like adding an off-brand subwoofer to the VC1. It creates that dip at 180Hz."
The left graph shows the anechoic response of the H.T2 setting in green, the more extended S.T in red. Neither is remotely flat to 40kHz. The three different H.T options are "1/ warm and relaxed with rich overtones; 2/ neutral and precise; 3/ modern, clear and musical. The super tweeter adjustments involve no padding resistors just micro coils and caps."
As shown above, the main crossover with its multiple big coils and large capacitor seals inside a metal chamber on the VC2's back plate beneath the lower terminals. "Buyers can still upgrade the included stock jumpers to Sanctus from our web shop to then match the internal hookup wiring. We also sell matching speaker cable for a consistent loom. And we're still considering an isolation footer upgrade package with RevOpods."
On the footer score I was all set with my Hifistay isolators from South Korea. I even had alternate jumpers from AudioArt and Vermöuth just in case. All my other cabling is by Exact Express, previously known as Kinki Cable. Amplifiers would be my usual 250W direct-coupled class AB 2.5MHz Kinki EX-B7 monos. When my bell rang with the white UPS van on the other side, its driver hesitated to even show me the yellow COD notice with the fat figure on it. I took a photo then sent it to MonAcoustic. Though I'd asked to make all VAT fees payable to their account, the Korean post office drop-off point on their end had likely nixed that option. But like an Irish terminator, my UPS driver would be back. "I drive by your house each day" he smiled with no resentment over a wasted stop. He's true working class: lotsa work, lotsa class. It then took Irish UPS a few days to notice Young's prompt online COD payment, conduct a 2nd import scan and get the shipment out of the Galway depot onto the white van again. But that was as nothing compared to an already 2-week FedEx delay to collect a 180kg assembled pallet from our address. Big Corp plus working class often equals a fat question mark.
