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L1® Users Forum Musicians General Forums To & From The Moderators Noise when I shut my L1 and T1 off|
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I have updated my firmware to DSP 1.7. I get a zip type of noise when I shut my system down.
How can this be fixed? Thanks! |
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I get that sometimes...usually when I turn off the system *right* after I've been using it.
If it sits a while, and the volume is down when I switch it off, I don't get that sound. I also turn off my Packlike AFTER turning off the Power Stand, or it will pop pretty loud. |
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Hello:
The title of your post indicates you are using a T1 with your L1. If that's the case you need to make sure you turn the power off on the L1 before you turn off the power to the T1, otherwise you stand a good chance of getting a loud pop, or zippy(ish) noise. Maybe that's what you're experiencing. If you're turning the L1 off before the T1 then I'm not sure where the noise would be coming from. Stu |
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I always turn my Packlite off before the L1 otherwise I get a weird noise. |
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Research & Development |
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Manager, Electronics Development |
Hey Sharkbyte -
First, I apologize for the delay replying. I like to keep it faster than this, but we had an internal communication issue that we will fix. Are you using your T1 with an L1 MII or an L1 MI? And, for thoroughness, are you using an external power supply for the T1 or the digital cable? Basically, when you have a T1/L1MII combination using the digital connection (single cable) from the T1 to the L1MII, the system should turn on and off quietly . This is true if you turn off the power switch on the T1 or on the L1MII. If that is what you have, but it is still zipping, we need to investigate further. If you are using the analog outputs of the T1, those will make noise when the T1 power is turned off. This is similar to other analog equipment. If you have a PackLite amp on the L1, I agree with the advice above: Like with any component system with a power amp, you should shut down from the speakers back (power amps off, then mixer, then preamps). Would you please let me know if this helps? Thanks, Bill |
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Manager, Electronics Development |
Sharkbyte -
See my reply to your PM -bill |
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Bill,
I am using the T1 with the L1 MII. I am using the T1 digital cable I always leave the T1 on and turn power off at the base. The speakers make the zip zip noise even if I have nothing connected to the T1 but the digital cable that goes into the L1 model II base. In fact the speakers make the same noise if I disconnect the T1 totally from the base. However when I do that the B1 does not seem to make the same noise. I don't have any other analog outputs connected to the T1. It seems to me that my L1 base unit has an issue? Please let me know if you have any other suggestions. Thank you! |
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Denny & Bill, you are correct...my bad. I realized after a gig last weekend, that I do turn off the Packlite first, and it shuts down quietly. I used to do the opposite and got the squawking sound. |
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Hi Sharkbyte,
Are you using phantom power with a condenser mic, or any other device that needs phantom power? O.. |
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I am not using any Phantom Power or other devices. In fact the same noise can be heard when I totally disconnect the T1 form the base and turn the unit on and off. I think there is some sort of issue with the base.
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Just bought two L1 Mod 2s, with 2 T1s and 2 B1s (still on trial period). I too get a zip sound when I turn off the either of the power bases, regardless of order with the T1s, and trim and master volumes down on the power bases and T1s. This sound is unusual but didn't sound alarming to me, like a capacitor discharging over a second or so, so I thought it was just a quirk with the L1 system and that I was just new to it. But if this sound is sign of a problem please let me know before my trial period is up in a couple of weeks
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Hi, RIB:
Try updating the firmware of both the T1 and the L1 base. (That won't 'void' your ability to return them, if you decide not to keep them.) Go to here to get the downloads and info on how to do the updates. FYI: the T1 update will take more than a minute or two! Be patient. Oh... and welcome to your first post on this forum! 
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Hi-- Updated the T1s and L1 power stands-- noise is still there when I turn off the power stands, regardless of order. The sound is perhaps decreased a little in volume, starts at a slightly lower frequency-- it's a gentle Zzziiipp As I said before it doesn't sound alarming but if it shouldn't be there we still haven't eliminated it yet. Anyone else had luck with a fix? What should be the next step? Do I need to replace these before my trial period runs out? Please advise.
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I happened to come across this discussion and realize that I have heard that Zzzziiiipp sound. I have 2 L1 II with 2 B1's each. This is my sequence when I turn off. All faders on the mixer all the way down, trim on both L1's to 0, then turn off the power of the L1's, and then the power on the mixer.
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Hi Stephanie,
I am hoping we'll hear from someone-at-Bose about this. But in the meantime, as a practical solution to shutdown noises... To avoid the zipping and popping, I just remove the Cylindrical Radiator®s and the connection to the B1 BEFORE turning off the power on the Power Stands. Simple, silent, and you won't hurt anything¹. I leave all the Analog Input Trims on the Power Stands just as they are (so I won't have to figure it out again later). ¹ Reference Model II, No speakers attached |
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I also get the “giant electric mosquito “ sound when I turn off my T1+L2. If this is not a symptom of a problem, and does no harm to the system, it is not loud enough or distracting enough , (show’s over), to matter to me.
Respect, Col. Andy |
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When you turn the system on, I guess you connect the Cylindrical Radiators and any B1's first, then turn on the power with the trim set at your playing level? I use a mixer and I would connect it before turning on the L1's and turn the mixer on, with all faders down, after turning on the power on the L1's.
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Hi Stephanie,
Once you have the Model II Power Stand Analog input trims set, you should not have to change them unless you move to a different mixer. Here are some notes from our other conversation.
As a matter of interest, I typically only turn down the master output of the mixer. Unless there is a change to the instruments, microphones, or the people performing, I tend to leave the controls alone. I use the master output of the mixer to manage the overall volume, but the rest, once it is setup and balanced doesn't change for me very much. For your open stage setups, you probably have to do more adjustments, and I do too in those situations. But back to standard operating procedure - if I had settings that worked for the house band, I would probably mark those with tape on the mixer. Shutdown/Startup procedures You can get into a lot more detail than I'm going to below. Some people are very careful to shutdown from the power amps (Model II Power Stands) and work backwards to the source. Some people are very careful to power up from the sources (instruments and microphones) and work step by step until they get to the power amps (Model II Power Stands). I do the following. Shutting down Mixer - turn down the master outputs Model II Power Stand - remove Cylindrical Radiator®s and B1 connections Now you can power things off in any order you like because there will be no noise. Powering on Model II Power Stand power on LAST Other than that you can basically do this in any order you like, but I would make sure that mixer master outputs were all the way down before turning on the Model II Power Stand. |
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L1® Users Forum Musicians General Forums To & From The Moderators Noise when I shut my L1 and T1 off|
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