Sounds like RF issues. Seems like something in the signal's shielding is allowing radio frequency to enter the system. I'm thinking somewhere in the cables been kinked and now it has become an antenna.

@AntonBrowne

7 ай бұрын

Thanks. It happens with various well cared for high quality cables, but I will keep that in mind.

@infinagon

7 ай бұрын

@@AntonBrowne absolutely. It might not be the cables though but definitely sounds like RF interference. You can here an unaudible voice in the interference.

Interesting investigation. Hopefully Bose will contact you to give us all an explanation. Side note: I've listened through your Mr. Baloney playlist many times. Whenever you feel the urge to get into some new baloney, please know that there are folks out here that would love to hear about it.

@AntonBrowne

7 ай бұрын

Thanks for reminding me, I have a few doses of Baloney loosely scripted, so...

@carlbeatty1486

7 ай бұрын

@@AntonBrowne Please let me know!😎

Of course, this is a problem of Bose, not microphones) it is a construction of a conditional linear array in the form of a column, where there are no separate HF drivers, and HF are trying to squeeze out of the MF speaker. In addition, these Bose systems have a horizontal coverage angle of 180 degrees.

Sounds like RF. Less a statement about cable quality and more about a congested RF environment! An easy way to check is with Ferrite chokes placed at either end of cable run, at mic and input to system. Clamp-on cores are available, which attach without wrapping the wire: this type of ferrite core is usually designed so that the wire passes only once through it. It may not tell you who the culprit is but I bet it will solve the problem on the cheap.

@AntonBrowne

7 ай бұрын

Thanks. Inexpensive enough, I will try.

Hello Anton, I use the SR40 and C636 every week with the Bose L1 Pro 8, L1 Model 2 or the old 802 and I have never had any problems, in fact, as soon as I bought the SR 40 at your suggestion and connected it to the Bose I had the best voice sound ever, and I thank you for that! I'll share your problem with the people at Bose Portugal to see if they have any ideas about this! Best, Ricardo Pereira

@AntonBrowne

7 ай бұрын

Thanks Ricardo, I'm still at a loss and no word from Bose here.

@pereiratech

7 ай бұрын

@@AntonBrowne As soon as the festivities are over I will go to Bose to exchange opinions about your problem. I would like to take this opportunity to ask you for your opinion, as I am used to singing with the Sr40, if I buy the new Sr117 will I notice a lot of difference or loss of definition? My question is due to the big price difference… Thanks

Hi Anton, I clearly hear a massive, nasty and ear-piercing cheep noise around ca. 10 - 12kHz with both the Earthworks and the KMS105, which builds up quickly the typical feedback way, once a certain gain level is reached. So to my ears, this IS feedback, probably caused by a combination of a supercardio (sensitive at the rear, too), wide frequency range-capable condenser mic, and the typical bose way of bending frequency response to compensate for the lack of tweeters.

Hi Anton, it definitely has to do with the Bose system. This is a processing problem; Bose uses a lot of processing to get the best out of not too great speakers, this to be able to get the form factor for the speakers they want to. What you hear is a different form of feedback, not acoustically generated but electronically generated; the processing end up going into a processing loop. This is obviously not caused by then sound coming back from the speaker, but internally by the processing electronics. I've seen it before with Bose systems when a signal that has content above 30 to 40 KHz. So when using a mic that has no problem generating these high frequencies combined with mixing equipment that will let those frequencies through, you are in a situation that this electronic feedback can be generated. You happened to try some microphones that are capable of capturing these frequencies in combination with a Bose system. These frequencies are most likely artifacts from the Bose processing unit outside the human hearing spectrum, but when picked up by the mic it can start the process. So it's a combination of mics with a very wide frequency response and artifacts generated by the Bose processing.

@AntonBrowne

7 ай бұрын

Thanks for the explanation... is there any cure?

@godfriedvanrooij5132

7 ай бұрын

That's a bit of a catch 22; to reduce the high frequency content you will need to add a low pass filter preferably as high as possible as not to influence the audible content, so let say at 20kHz. When using a first order filter it will only reduce the 40 kHz by approximately 8 dB, and the 30 kHz by 5 dB, but also 20 kHz by 3 dB and 10 kHz still by 0.5 dB; when using a higher order filter it will reduce the problem frequency range more drastically, but it will also introduce more noticeable phase shifting artifacts. For instance with a 4th order filter the total phase shift will end up going to 360 degrees; at the high pass frequency it will already be 180 degrees. The Butterworth 4th order filter has the least amount of ripple and would be the best. The filtering at the different frequencies would be; - 24 dB @ 40 kHz; - 14 dB @ 30 kHz; - 3 dB @ 20 kHz and 0.05 dB @ 10 kHz. Unfortunately only trial an error will determine if this will solve the problem or potentially introduce different problems. The phase shifting might introduce new problems in the Bose processing.

Uh, that sounded like a dental drill...

You could try connecting pin 1 of the xlr to the tag on the shell of the connector ( at both ends of the cable ). This could reduce RF interference and is relatively straightforward.

Do you get the noise if you use the desk between the earthworks and the Bose?

@AntonBrowne

7 ай бұрын

I will try a desk but don't hold out much hope, as I usually use the TC Helicon Perform V before going into the Bose (and was initially blaming that, but no). For the test I used a stand-alone phantom supply (the L1 Compact doesn't have phantom) but still the problem.

yeah its extremely noticable, its so high pitched piercing, its a weird problem, idk if its feedback though, that usually isnt how it works, it seems more like some sort of electrical problem. the 117 and neumann most def had it later on as well, the sennheiser just had feedback. I would decouple a bunch of things, just eleminate variable, id be curious to know if it came from the speaker, the high pitched sound, or just the microphone causing it in combination.

@AntonBrowne

7 ай бұрын

Wow! That's alarming. No wonder people were reacting the way they did. I'm going to get my hearing checked because I can't hear the high stuff. It's very odd that it seems to happen on the old gear too. I'm wondering if it's something to do with the extreme treble boosting Bose use in order to get treble without using tweeters or a horn.

That is most unfortunate. Could be interactions between the audio in/outs and electromagnetic leakage/currents from the usb-drives. Try ferrite cores on your cables, maybe they help.

cable or humidity ?

The noise seems to be more Radio Frequency pick up rather than feedback. This could be an break down of continuity between the microphone and preamps in the equipement. The is a crackle just as the noise starts that suggests it could be poor contact problem possibly in the XLR connection. I note your reply to a similar point from @infinagon that you have used several different cables. and the problem continues. I suggest you should double check the quality of the XLR's connection to the microphones,

Not sure about the Neumann but the Earthworks mics have a wider than usual dynamic range. I wonder if they are picking up something higher up from the Bose system that the other mics are not picking up and you are getting a feedback resonance. An FFT phone app might be able to visualize it. A filter/EQ cut off might be able to get rid of it if so.

Ive had nothing but static and cracking noise with the last Ethos black that i let guitar Center have! The one before it, popped and the like in a live private gig. Finished that gig with a dynamic!!! Not sure what Earthworks are doing. A person at Guitar Center flat out acknowledged how noisy earthworks mics can be. Pleasw please try for us the Ehrlund EHR-H and the Oktava MK-207.

Not the microphones, this is electrical interference being introduced by the Bose or parts in-between (cable, mixer, adapter). I would suspect the EW mics but the Neumann issue makes that doubtful. Also odd that Bose would have an incompatibility across that many models persist undocumented for so long. I would try introducing a DI box in the chain, maybe. Also wonder if the phantom being supplied by the Bose isn't the issue.

@AntonBrowne

7 ай бұрын

Thanks. I use a TC Helicon Perform V for effects and phantom - so kind of a DI. In the video I used a dedicated phanton supply. The fact that it happens across all combinations, with different quality cables, is perplexing. I wonder whether Bose applying aggresive high-frequency EQ might have something to do with it? This would explain why it happens on my old analougue 802 system as well.

@ForteeTwoTwenty

7 ай бұрын

Do you use the same separate phantom power box each time on each system?

Dear Anton! Please give us a review of the Ehrlund EHR-H, and the Oktava MK-207. Please please!!! The

High frequency feedback, this could be solved easily with a fully parametric EQ