What about a flash of perception? By June 28th, "a quick update. I came up with a new circuit idea. We decided on one more prototype to see whether it'll work. I think it'll be even better and hope that we can pull it off. The downside is that we need to extend our original July 1st embargo by about 3-4 weeks. I'll confirm more technical details once we have the new PCB assembly next month."
By July 26th, "we must ask for yet another embargo extension until around mid month as we put our best effort into these new circuits. We're testing a novel idea on the output devices plus a whole new power supply redesign so both are still being evaluated to insure the final spec to launch with. As for photos we can probably send you a video link later as we've recently taken a very nice one in Sweden with a professional company. It's beautiful and got some internal and rear views as well."
By August 4th, "our Korean HQ is moving to a new location. Fortunately we were selected to be in the government-supported industrial complex of Gyeonggi Techno Park. With our increased production and exciting new projects underway, the place is perfect and we're really looking forward to what will be coming down the road from here!" This Seoul industrial park's most current tenant list shows biotech, data control, military security, nano powder, pharma, solar, steel frame and other manufacture and R&D as Enleum's new neighbors.
By August 16th, "the final updates we worked on were mostly on the output stage since I wanted Mosfets for the voltage output to bring its sound characteristics closer to the AMP-23R. All our previous HPA had bipolar output stages. The 23RM's voltage output now is a simplified version of the AMP-23R's JET2 Bias. The bipolar current output stage too is new and improved over the HPA-21's. Now the 23RM is like having two different amplifiers in one small case. Next week I'll get the final prototype sample from Korea to approve production. Our novel 1.2MHz switching supply can operate in 1-watt/30Ω 'R' mode for full output via external power or battery under USB power. 500mW 'M' mode is for more efficient mobile use."
Open unit with empty battery slots.
"That's powered by just our two internal German Li-Ion 3.6V cells with up to 2'000 recharge cycles. The circuit employs only discrete transistors with zero negative feedback for an ultra-fast ultra-bandwidth response. Continuous play in M mode is up to 5 hours. Socketry are ½" current mode and 1/8" voltage mode outputs, RCA and 1/8" mini analog inputs and USB C charging. The first batch of 250 units is expected to start shipping in November. When we took pictures, we weren't yet sure whether we'd charge with USB C at 5V or 9V and at how much current so didn't take photos of that end." This video shows a glimpse of it at 0'37".
By mid November, "over the last few months we've improved the HPA-23RM's performance and efficiency with these four different prototypes below. The last board at the far right proved best and already went off to safety inspection. We're finally prepping first production based on it. This created a slight delay of our initial target date but the improvements are well worth it."
December 21st: "The very first HPA-23RM production unit is now completed. We've had some safety inspection delays but are now finally getting ready to dispatch early units hopefully still within this month. Thank you for your patience and we promise it was worth the wait!"
