Tagged With "Feedback"

Blog Post

Feedback / Microphone

ST ·
What is feedback and how does it occur? Feedback occurs when the sound from the loudspeaker (or loudspeakers if a microphone is connected to more than one) is louder at the microphone than the sound of the voice. This fundamental fact is shown in the figure below. Note that in the diagram an L1 system is shown but the same fundamental fact is true for ANY loudspeaker. If you understand this diagram, it is relatively easy to understand how changes in an amplification system and room can...
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Re: How Do I use the T1® Noise Gate to Automatically Mute a Microphone?

Seagullman ·
Easy to follow and understand. That should help a few people to avoid microphone feedback in more difficult situations. Tony
Topic

How Do I use the T1® Noise Gate to Automatically Mute a Microphone?

ST ·
One cause of feedback is open microphones on the stage. You can use the T1 ToneMatch® audio engine Noise Gate to mute (shut down) microphones that are not actively being used. Here's a quick video to show you how to do it. ... more about the T1® ... T1® Videos ST
Topic

High power before feedback?

Garry ·
Good Morning / Afternoon all. Just a question to satisfy my curiosity. Having now tried our L1 Model 2 on a high stage after exchanging from a model 1 "see previous posts" I am curious to know how you can achieve such high levels of volume with this unit behind us on stage? My previous experiences with PA in a band with speakers at the side of the stage are problematic at best. I know it can be down to quality of equipment but that cannot be the whole story. We did a rehearsal last night at...
Blog Post

The Bose L1® Approach and the History Of Amplification

ST ·
The L1 ® approach to amplifying live music is based on the qualities of unamplified music: each musician in control of his or her sound, the ability to hear oneself and each other, and the sound of each voice and instrument coming from its unique location. This video explains the major historical eras of amplification, from the early days of individual instrument amplification to the era of triple systems ( backline , monitors, PA) and the present era that includes the new L1 ® approach. The...
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Re: High power before feedback?

ST ·
Hi Garry, The answers to your questions are in this video. Enjoy. The Bose L1® Approach and the History of Amplification. ST
Topic

Unable to generate enough volume w/o feedback

B&B ·
I've owned an L1 mod II/B1 system for several years for small gigs, and added two F1's recently for larger venues. Used it first indoors in a very large cafeteria, with zero issues - in fact, the sound was incredible, and much-commented on (we use the L1 system as monitor). Yesterday we played an outdoor venue with furthest seating approximately 150 feet from stage. Lots of ambient crowd noise necessitated pumping up the volume, but despite a lot of adjusting, I couldn't get past 12 o'clock...
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Re: Unable to generate enough volume w/o feedback

NickA-at-Bose ·
Hi B&B, With a single T1, L1, and two F1 812s, I would use the T1's Master Out to feed the first F1 812. Then, use the F1 812's output to feed the second F1. Make sure the F1 812s' inputs are set to Line Level Were you using the two F1 812s in front of you, like a traditional PA system? If not, I would place them in front of you and let them do the heavy lifting of producing the volume necessary for the crowd. And then since you're using the L1 as a monitor, you're free to position it in...
Topic

Reduced sound when using Tone match with L1 Compact - need help

ST ·
Hi Ali, Thank you for joining the Community. I noticed your post in the Ask Bose for Help forum. aliwegener posted: Hi there. I'm a singer/guitar player using the Tone Match with the L1 Compact. I cannot get the same volume and clarity in the vocals without feedback when using the Tone Match vs. just connecting my mic directly to the L1 vocal input. Unfortunately, as you add microphones to a PA system your gain-before-feedback goes down. This applies to PA systems in general. I'm using a TRS...
Topic

Establishing mic feedback frequency.

Garry ·
Good Morning / Afternoon all. I have just been looking at the YouTube videos and one that did interest me was using the Parametric EQ. I have read about using the Para EQ to attenuate problem frequencies, this requires you to set the boost to +10db and 0.20 oct. then slowly turn up the volume till just before feedback. Then adjust the frequency control until feedback occurs. Then turn the boost down to -3db (ish) I suppose with some practice this could be a quick method of reducing feedback...
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Re: Establishing mic feedback frequency.

ST ·
Hi Garry, Yes. Using the Tuner is a great way to identify a problem frequency. I've used it with instruments like a guitar or bass. That's easy when you can play the offending note, look at the Tuner and see the frequency. I haven't tried it with a microphone specifically for microphone feedback. Please tell us in more detail how you would do it. Thanks, ST
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Re: T1 settings - Feedback problem

ST ·
Hi Tylaus, Thank you for joining the Bose Pro Portable PA Community. Congratulations on getting your new L1® Model 1S with B2 and T1®. Here's a couple of things to try. zEQ: Low 0db , Mid 0.4db, High 0.4db Sing closer to the microphone to get a fuller tone Try different settings for the B2 Have you tried the Minus or Normal settings? Move the B2 a few feet in any direction It may be sitting in a position where it is resonating with the room. Moving it a few feet can make a huge difference.
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Re: T1 settings - Feedback problem

Tylaus ·
Thanks ST for your quick replies. My B2 currently has Normal setting. I will try your other suggestions (zEQ Low to 0db, and move the B2 around a little), and will report back. Thanks again!
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Re: T1 settings - Feedback problem

ST ·
Hi again Tylaus, There's no "Auto Calibrate" feature. ST
Topic

T1 settings - Feedback problem

Tylaus ·
I've just got a new L1 1S with B2 and T1, and my main application is karaoke. My problem is I have pretty loud feedback occasionally when I move around (not the high pitch, but low frequency bassy/humming feedback). The setup is in my home, the room is about 20x25 feet. I've followed several videos to setup the connections, the trim, and the volumes, so I don't think there's any problems in these areas. The current settings I have are: Channel1 (Mic): - ToneMatch: Vocal Mics Shure SM58 -...
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Re: T1 settings - Feedback problem

Tylaus ·
Would like to provide some update. Setting the zEQ to 0db, and moving the B2 around didn't seem to do much. I did these 2 things, and they seem to help quite a bit: (1) Reduce the gain on my Shure SM58 mic by -10db; (2) Set the B2 to Low (instead of Normal). This means I'm losing some power from the mic, and some bass, but they help with the feedback problem. Thanks.
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Re: Major Vocal Feedback problem.

Rod ·
Hi troubador, You may be right, excessive gain could be the problem. I know that one of the differences between the original Mic Mechanic and the latest version (ie Mic Mechanic 2) is that there is now no mic gain control/setting so the gain is said to be automatically set by the singer's vocal/input thereby removing the need to manually set microphone levels. Good thing / not so good thing ? not sure! Maybe this is my overall problem, so I'm going to go right back to basics and remove the...
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Re: Major Vocal Feedback problem.

Rod ·
Hi FCBlues, I've had a couple of helpful replies to my 'feedback' problems and they have been along the same lines as you are suggesting ie the TC Helicon is the cause in some way. So I am going to remove the Mic Mechanic 2 from the chain, (reset all my settings in the L1 mk 2 and reintroduce the Mic Mechanic 2) adjust/tweek settings as I go along. Thanks for your advise - I'll let you know how I get on. Don't mind if I have to get rid of the Mic Mechanic 2 if it rids me of my problem BUT...
Topic

Major Vocal Feedback problem.

Rod ·
Hi, I have the L1 Mk 2 with 2 bass modules and ToneMatch T1. I am a solo performer (guitar/vocals) using a Line 6 pedal (guitar - channel 1) and a Shure SM58 into a TC Helicon Mic Mechanic 2 (vocals - channel 2) and backing tracks via iPod into channels 4/5. I am experiencing serious vocal feedback problems and hopefully you and your team can offer some suggestions as to a possible solution. The situation is that whilst singing, playing guitar and having the backing tracks playing there is...
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Re: Major Vocal Feedback problem.

Bose Pro Community Admin ·
Hello, Rod. This sounds like a good question for the broader owner community (rather than Ask Bose for Help). There may be other suggestions outside what we can provide. May I have your permission to move this discussion to the public forum? It sounds like the TC-Helicon Tone feature in the Mic Mechanic is adding gain to the microphone between songs. It could be doing that because you sing louder than you speak when addressing the audience between songs. To test the idea, take the Mic...
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Re: Major Vocal Feedback problem.

Rod ·
Thanks for your reply and suggestions. I will remove the Mic Mechanic unit from the chain as you have advised and report back with the results. I think I will also contact TC Helicon, they may be able to offer some advise/suggestions to resolve my feedback problems. And yes you most certainly can move this discussion to the public forum. Kind regards, Rod.
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Re: Major Vocal Feedback problem.

FCBlues ·
If I had to jump to judgement I would blame the TC Helicon because it adds so many variables to the mix and I had a lot of surprizes when I used one. We have the same set up with same mics and acoustic guitars and can crank it up with it right behind us and no feedback ever. I would doubt it's from within the bose unless it's just broken. I'm sure you thought of this, but strip it down and rebuild it piece by piece with just the Microphone and a guitar with no effects. When it come time to...
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Re: Major Vocal Feedback problem.

troubador ·
@Rod My 2 cents worth -- I found my TCH Harmony GX-T was putting way too much gain on the line. I removed it from the chain and all was well. I use my L1M2 2B1 T1 combo and love what it puts out ... now using an S1 for busking and loving it.
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Re: T4S/T8S Gain Staging and Setting a ToneMatch Preset

CityFolk ·
@ST just FYI im not seeing a video when I use my iPad on Safari.
Topic

T4S/T8S Gain Staging and Setting a ToneMatch Preset

ST ·
We have a new article with a video about the gain staging the T4S/T8S ToneMatch mixers. Gain Staging (setting the input trim) is the first step when connecting a source to the mixer. Here's the link to the article ToneMatch Mixer Gain Staging and ToneMatch Presets Enjoy! ST
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Re: T4S/T8S Gain Staging and Setting a ToneMatch Preset

ST ·
Hi CityFolk, Thanks for writing. I just double checked it on my iPad Pro 12.9 IOS 11.4.1 with Safari. Here's how the page looks from here. ToneMatch Mixer Gain Staging and ToneMatch Presets Are you seeing something different? ST
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Re: T4S/T8S Gain Staging and Setting a ToneMatch Preset

CityFolk ·
Weird, the video area was blank but now I’m seeing it fine.
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Re: T4S/T8S Gain Staging and Setting a ToneMatch Preset

CityFolk ·
@ST Video clearly shows how to do the gain/trim setting. That’s always been a bit murky to me. I thought it made it pretty fool proof.
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Re: T4S/T8S Gain Staging and Setting a ToneMatch Preset

ST ·
Hi CityFolk, That's a relief. What do you think of the video. ST
Topic

Microphone Feedback with T8S, two L1 Model II with B2

Jami ·
This is helpful, thank you. I'm hoping that you can help us with the biggest challenge our 4 piece rock back has had from using the T8S and two L1 II system/B2 bass which is microphone feedback. We have done all you recommend on the video in the past, but unless our main vocalist is physically blocks the mic from the speakers, we get huge feedback. We have noticed if we turn the trim way down, we get less feedback. I don't like doing that however, because I'm guessing we are compromising the...
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Re: Microphone Feedback with T8S, two L1 Model II with B2

ST ·
Hi Jami, Have you seen this article? Microphone Feedback Notice the section on using the Noise Gate. ST
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Re: Microphone Feedback with T8S, two L1 Model II with B2

Stephen ·
What levels are the main outputs on the system?
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Re: Microphone Feedback with T8S, two L1 Model II with B2

Chet 3 ·
Are the L1s behind you? If so, moving them to the sides and slightly in front of the microphone line may still give you enough sidewash sound for monitoring and be much more resistant to feedback...
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Re: Microphone Feedback with T8S, two L1 Model II with B2

ST ·
Hi Everyone, I've updated the Microphone Feedback article with information specific to the T4S/T8S ToneMatch mixers. ST
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Re: Microphone Feedback with T8S, two L1 Model II with B2

Jami ·
we struggle to get the system over about 11 o'clock
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Re: Microphone Feedback with T8S, two L1 Model II with B2

Jami ·
We're going to try that at tomorrow's rehearsal. thank you for the thoughts on that.
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Re: Microphone Feedback with T8S, two L1 Model II with B2

Jami ·
Thank you!!!
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Re: Microphone Feedback with T8S, two L1 Model II with B2

Jami ·
we struggle to get the system over about 11 o'clock
Reply

Re: Microphone Feedback with T8S, two L1 Model II with B2

ScubaBadger ·
Hi Jami Have a look at the mics you are using, check the make and model at the manufacturers site and look for the polar pattern. Some Shure mics for instance come with varying polar patterns for resisting sound from the side or other angles. I run two L1 MKII systems in stereo and use a Shure Beta 87A specifically chosen with this set up in mind. I could have chosen the Beta 87B which is a different polar pattern that I believe would have brought about issues with feedback - I could be...
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Re: Microphone Feedback with T8S, two L1 Model II with B2

ScubaBadger ·
If using radio mics, do the receiver have sensitivity settings? On my Shure QLXD4 receiver I continually have my receiver sensitivity setting down at minus 12 - 14db.
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Re: Microphone Feedback with T8S, two L1 Model II with B2

ScubaBadger ·
I have on occasion in a noisy room where I am playing at reduced levels had the two L1's to my sides - a couple of metres away with them a couple of feet in front of me but turned in such that the 180 degree spread is bleeding towards me just a little - then I have up front speakers with a very little bit of foldback to monitor myself.
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Re: Microphone Feedback with T8S, two L1 Model II with B2

Jami ·
We tried anything and everything at our last rehearsal with trim, noise gate EQ, etc with the mixers. Our lead vocalist uses a Shure Super 55 deluxe. The sound is amazing and in some ways it resists feedback, and in others it seems to magnify it. We found we had the most success by putting the two L1's in barely in front of and to the side of the mics and putting both back up vocal mic's on the L1 that wasn't used by the lead vocalist. There is enough bleed behind the system, that we could...
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Re: Microphone Feedback with T8S, two L1 Model II with B2

ST ·
Hi Jami, Thanks for coming back to tell us how you're doing. I'm looking forward to hearing from you when you've done a few gigs with the new setup. Cheers! ST
Topic

Feedback Issues

patmcnabb68 ·
I have two L1 Model II units with two B2 subs. I use a QSC Touchmix-16 for mixing. We are an eight piece band with three horns, keys, bass, drums, guitar and a lead singer so use all 16 channels on the board. We have gigged once with the set up and later shot a live performance video for marketing the band. Both times we had issues with feedback. We could not get the lead vocal hot enough without creating feedback. I may have positioned the towers incorrectly both times, too far apart or too...
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Re: Feedback Issues

ST ·
Hi PatMcNabbb68, Thank you for joining the Bose Portable PA Community. Just have time for a quick fly by (happy long weekend). Please check out this article Microphone Feedback There are some tips about using effects with the T1. You can probably adapt some of those ideas to the TouchMix 16. Do you have a picture of the band performing with the L1s? I'd like to understand where you have the L1®s positioned. ST
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Re: Feedback Issues

patmcnabb68 ·
I will see if we have a shot from our video session. Thank you for your quick reply. I love the sound of my speakers and the portability. I carry everything myself and set it up myself. Not bad for a 68 year old. Pat
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Re: Feedback Issues

ST ·
Hi patmcnabb68, Thanks for using the Sketcher. I know it seems counterintuitive, but I would pan the lead vocalist's microphone hard to one side. You'll get more gain before feedback, and because the L1 Model II has such wide horizontal dispersion, the audience will still hear the lead vocal. I would pan to the system on the right in the sketch. Carrying that idea further, I would also pan all the inputs hard to one side or the other. Check out this article: Cocktail Party Effect ST
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Re: Feedback Issues

W. P. Anthony ·
Too high Mic/Vocal compression can also cause feedback. Too much Gain also.
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Re: Feedback Issues

W. P. Anthony ·
Too high Mic/Vocal compression can also cause feedback.
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Re: Feedback Issues

patmcnabb68 ·
Thank you for these great suggestions. I'm pretty sure we had the compression all wrong on our first gig using this system and we adjusted the gain incorrectly. OK, we did about everything wrong we could do and still survive.
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