Many times a multi layer board is used to add shielding in some layers and separate the audio from the data. That or better DC filtering or some logic controlled audio gating? I hope I'm wrong but it's a common problem mixing audio and data. I don't think it's going to be a bubblegum fix? Maybe a redesign of the board trace layout to eliminate inductive or capacitive coupling of the data into the audio. Of course it should be on the list of things to look into.
SPEAKER HISS MOD
It's not the end of the world, doesn't ruin what is a great mod for the 9x but again no harm in trying to resolve it. In the UK (well for me at least) I'm often sitting in the corner of a random farmers field in the middle of nowhere, goggles on and with near silence (except the birds) and at the moment that hum is niggling.
SPEAKER HISS PROFESSIONAL
It sounds like you have a professional flying field and I'm leaping that you're not an FPV pilot. I do get your point and don't want to be one of those people but it doesn't hurt to put a bounty on it and see if it can be fixed. I don't fly there.Īgain, please fly it at your site and see how it goes first. Sitting in my quiet computer room programming it I do hear noise. Add turbines and 1/4 scale 3D 100 ft away, and I honestly don't think I'll do anything with the audio. While flying, unless it's on a quiet glider hill, the pocket rocket planes, cell phons, BTooth speaker "tunes" playing at my busy field, drowns out everything. I honestly didn't think about it flying as I said. I'll make it talk more while I'm flying and really listen for excessive noise. Not easy to tack on stuff and not trash the board, at least not my board. I'm just saying, in due time things could be improved, but it'll take a donor board to mess with due to the small traces and parts layout. The spectrums I've listened to are quiet, but the audio freq range to me it restricted a lot. Then you add a uhf or dragon link with its rf and data, and it starts all over.
SPEAKER HISS PRO
You can see it from a mile away but it's really littleīrent of Skyboard and the 9XR pro fought it, and Frsky took maybe 4 generations of board designs and lead chokes to reduce it. Its also quite possible that its none of the above, and its something vibrating in your case so perhaps a first test could be to remove the speaker and hole it in your hand away from the radio (as much as possible) and see if you still hear it?įly it and make sure it's not like a scratch on your car. if it is a few defects or a design issue or if these are just low quality speakers. There are a slew of other specifications when it comes to speaker selection, none of which I had even a modicum of understanding about.Īnyway, my point is we don't know what it is. The 9X Voice community seemed to be just using whatever random 8ohm speakers were available to them, so when it came to sourcing I didn't even know what specs to look for besides "40mm diameter" "max 5.5mm thick" and "8 ohm" and "at least half a watt". I'm not going to lie and say the speaker is some specially made high quality component. So maybe the two of you are just more sensitive? Or maybe it isn't happening with others and it is with you? That is to be determined, I guess. What one person can't even perceive drives the next person up the wall. With that said, however, hearing is a funny thing especially when it comes to droning noises like I think you're describing. I would suspect if it were a problem with the design overall that we'd be getting more. So far I've read two "complaints" (for lack of a better word) about this, including you. but I believe you that you're hearing something. I may try resetting the amps micro processor to see if that could be the problem.I couldn't hear it in your video. all the speakers produce it, even though that are different and are connected by different cables, which makes me believe that the AMP is at fault? even when nothing is connected they still produce the hiss. Ive tried the amp on all its settings, on all modes, with various equipment. nowhere near enough to affect the sound when listening to music or films, but still, it is audible when you put your ear a slight distance from them (about a foot away it fades out). The problem i have just noticed is that the tweeters of all the speakers are producing a slight hiss. i think the stuff is Gale Electronics, XL189. The rears are connected with basic hifi cable, they are too far away from the amp for my pocket unfortunately. The centre is connected with QED silver anniversary cable. The MX-4s are connected with QED profile silver 12 cable and QED airlock plugs, they are biwired. I have a Denon AVR 2801 connected to a set of Tannoy speakers two mx4s (front) two mxRs (rear) and an mxC (centre). hope someone on these wise forums can help:
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