Dear friend, Hi, we do not have Q13 plan this year. Best regards

Dear friend, Hi, we will report to the engineer for checking first. You could use the play button for help instead? Best regards

Dear friend, Hi, thanks for your interest. It will be release at about next month. Best regards

Dear friend, Yes, about that time, so it may still take some time for the engineer to improve. Best regards

Dear friend, Hi, if you are convenient, please show us some screenshoot for check via email(support@fiio.com) Best regards

Dear friend, You may check the firmware version of the red and black K7 first via the FiiO Control Panel? The color of K7 will not affect the volume control. (I don't have a K7 so I show you the firmware checking picture for Q7) Best regards

Dear friend, Hi, if you need extra rear glass for Q15, you could contact support@fiio.com for help. Best regards

Dear friend, Hi, electronic buttons need a certain amount of strength to respond. The buttons need to have a certain amount of activity to avoid being stuck. You could try heavier force? Best regards

Dear friend, Hi, thanks for your kind feedback. 1. According to our test, the USB DAC delay of M23 is within 200ms. Are there any other certain setting in your computer? Does the problem happen when using other APP? 2. When the charging port(any C port will do) is connected to a fast charging...

Dear friend, Hi, I tried the same setting but did not reproduce the problem. Did you try another usb port and headphone? If the issue remains, please check the Global gain. Did you adjust it as well? Best regards

Dear friend, Hi, the KA17 does not support line out. And we do not have volume setting close to LO sorry. Best regards

Dear friend, Hi, yes. And the PO/LO setting could be adjusted for balanced and single end output separately. The LO volume could be adjustable or fixed according to your setting. Best regards

Dear friend, Hi, can the 3.5mm cable comes with the JT1 meet your need? If yes, you could contact support@fiio.com and we could offer one for you. Best regards

Dear friend, Hi, 1. Yes. 2. Did you adjust the whole gain for the certain frequency? And did you adjust the EQ via the website? Currently, adjusting EQ via website link will have dada sound. Best regards

Dear friend, Hi, the Fuse Tube Specification is @T 250V2A φ5x20mm. Best regards