#Cowon a2 rockbox install#
To install a bigger screen, we have to overlap the screen "over" the Nutube. that is the reason why we can't use a bigger (or longer) screen in N8. the 7.2mm (6.2mm + 1mm) "thickness" requirement has ruled out the option to put the screen on top of the Nutube, and right now, if you look at the N8 photo carefully, you'll notice that the screen are installed immediately above the Nutube. The tentative dimension of N8 is 128mm x 70mm x 20mm (LxWxH), the Nutube required 46.7mm x 17mm x 6.2mm (excluding the pins), and it will sit on 1mm above the PCB. Let's examine the dimension in more detail. You have nailed the reason for that: fitting the Nutube into N8 requires a lot of consideration. While the home button can theoretically (but unlikely) be changed to a different shape (or color for that matters), the size of the screen are fixed due to space constraint. Our usual practice is to launch a DAP in domestic market first, international market will launch at 2-4 weeks after that. We shall explore more detail of N8 design concepts and features later on, we have to complete the migration from R&D to production in due course so we are at least 2-3 months away from product launch. The same apply to the explanation I have written in English, they are not available in Chinese either.
#Cowon a2 rockbox series#
This is a series of introduction aimed at our customers in China, we don't have solid plan to synchronized the content, so can't promise English version to start with. The demo units will head to Bejing right after the High End 2018 for its debut in China (26-27 May), we should be able to provide more detail along this line by early June. We shall measure the engineering units later. No, you didn't miss it, we haven't publish the power rating. et rassurantesĭid I miss it, or have the output voltages not been released yet?
To summarize, you can change between tube and Solid State in 3.5mm headphone output, but you only have solid state output with 3.5mm line out and 4.4mm headphone out and line out. Using two DAC chipset instead of one in single-ended purpose does offer better THD, dynamic range and channel separation, so Cayin is not being nonsense. The 4.4mm balanced output will utilize all four L+, L-, R+ and R- signal, while the two 3.5mm single-ended output will use L+ and R+ signal from LEFT and RIGHT AK4497. To explain this in simplified terms, the LEFT AK4497 delivers the L+ and L- signal, the RIGHT AK4497 delivers the R+ and R- signal. When you are listening to the 3.5mm output of N8, you are still using TWO DAC at the same time. So the true meaning of cost-no-objective is to deliver the best result even when the solution required out-of-proportion resources? Isn't it common sense that cost-no-objective does mean we can ignore the scientific (physic and electronic engineering) constraints, and there issues that can't be solve by money or devoting more resources. If we use Two Nutube instead of one, either the screen will be reduced to a 1.5 inch 4-lines text-based LCD display and battery life as short as 2-3 hours per change, or we need to extend the N8 by roughly 35mm long and battery life at around 4+ hours. The N8 is fairly big for DAP already, we have do all we can to make it possible to control most (definitely not all) features with single hand, and fairly easy to hold with one hand. If we use Nutube for balanced audio output, we need two pieces of Nutube, there is no exception, even cost-no-objective design will not be able to override this requirements. The main different between a line amplifier and a headphone amplifier is the former involve only voltage amplification while the later involve both voltage and current amplification. For the record, we still need a line amplifier if we want to achieve a high quality desktop grade line out instead of wire the DAC output to the line out connectors directly. In N8 design framework, both balanced and single end line out are as close to DAC chipset output as possible, we only implemented a Low Pass Filter with buffer between the DAC chipset and line amplifier. The line out signal path will definitely bypass the headphone amp circuit in order to remain as clean as possible. The Nutube is part of the headphone amplifier circuit, this is the only place we can use it. I'll try to tackle several tube output related issues in one post:
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