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Post by jj2106 on Dec 18, 2018 8:53:38 GMT -5
Hi all, After a long silence, I finally bought an A-100. There is a continuous buzz which is due to the cabling between the DAC and the amp (a Cat-6 network cable with a pair of baluns). The buzz is audible from as far as 6 ft from the speakers when no music is played. The amp is configured for Auto-on, and never goes to standby (the LED is always blue). Hence my question: what is the voltage that triggers auto-on, and the voltage that triggers auto-off? Thanks a bunch. Jean-Jacques
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KeithL
Administrator
Posts: 9,902
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Post by KeithL on Dec 18, 2018 14:22:56 GMT -5
I don't think I can give you simple answer there. The switching is somewhat timing dependent.... so a more powerful signal will cause the amp to switch on more quickly.
It may also take a bit longer to time out and switch off depending on the level of the incoming signal before the incoming signal stopped.
If your DAC has a trigger output, using that to switch the A-100 would be more deterministic.
Hi all, After a long silence, I finally bought an A-100. There is a continuous buzz which is due to the cabling between the DAC and the amp (a Cat-6 network cable with a pair of baluns). The buzz is audible from as far as 6 ft from the speakers when no music is played. The amp is configured for Auto-on, and never goes to standby (the LED is always blue). Hence my question: what is the voltage that triggers auto-on, and the voltage that triggers auto-off? Thanks a bunch. Jean-Jacques
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Post by garbulky on Dec 18, 2018 15:53:04 GMT -5
Hi all, After a long silence, I finally bought an A-100. There is a continuous buzz which is due to the cabling between the DAC and the amp (a Cat-6 network cable with a pair of baluns). The buzz is audible from as far as 6 ft from the speakers when no music is played. The amp is configured for Auto-on, and never goes to standby (the LED is always blue). Hence my question: what is the voltage that triggers auto-on, and the voltage that triggers auto-off? Thanks a bunch. Jean-Jacques You can use an amazon smart plug to use as an outlet and an echo dot to turn it off and on with your voice. The buzz isn’t normal.
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Post by jj2106 on Dec 19, 2018 3:45:58 GMT -5
Thank you both. Instead of asking silly questions, I will first change my cabling and keep you posted. J-J
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Post by vcautokid on Dec 19, 2018 5:25:10 GMT -5
The buzz is usually a ground potential issue or a shield ground issue on a cable. You said you are using a CAT Network cable with Baluns. Was a hum issue present prior to usimg the Balun setup?
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Post by jj2106 on Dec 20, 2018 7:00:20 GMT -5
The baluns WERE the culprits. They've gone to the dustbin. Thanks to all. J-J
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Post by macromicroman on Dec 20, 2018 8:10:48 GMT -5
Glad you were able to solve the problem.
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Post by jj2106 on Dec 20, 2018 8:30:52 GMT -5
Glad you were able to solve the problem. We are nearly twins! I was born June 21st, 1949. Jean-Jacques
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Post by garbulky on Dec 20, 2018 15:46:18 GMT -5
The baluns WERE the culprits. They've gone to the dustbin. Thanks to all. J-J Hehe I was about to say use some normal wires but I figured you had your "reasons" Glad you got it figured out
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Post by jj2106 on Dec 21, 2018 6:50:21 GMT -5
Yep, this what I should have done in the first place, but I was concerned that a 10-meter RCA cable might pick up noise... And those baluns were so cheap ($8 a pair)! Bad choice. J-J
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Post by garbulky on Dec 21, 2018 11:26:08 GMT -5
Yep, this what I should have done in the first place, but I was concerned that a 10-meter RCA cable might pick up noise... And those baluns were so cheap ($8 a pair)! Bad choice. J-J Why a 10 meter cable?!
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Post by jj2106 on Dec 22, 2018 3:51:59 GMT -5
Because this is the distance between my PC/DAC and the power amplifier. More exactly, the distance as the crow flies is 3 meters, but the cable leaves my desk, then goes to the ground, then to the ceiling, over a door, then to the ground again So the cable has about 8 meters to go, and 10 meters is the closest standard length.. But don 't worry, it works well (with a good quality RCA cable). J-J
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Post by garbulky on Dec 22, 2018 10:17:32 GMT -5
Because this is the distance between my PC/DAC and the power amplifier. More exactly, the distance as the crow flies is 3 meters, but the cable leaves my desk, then goes to the ground, then to the ceiling, over a door, then to the ground again So the cable has about 8 meters to go, and 10 meters is the closest standard length.. But don 't worry, it works well (with a good quality RCA cable). J-J Ah, cable management I see. The work of a less lazy man than I!
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Post by jj2106 on Dec 23, 2018 4:53:43 GMT -5
I'm also lazy, as I'm disabled. But I have a Jack of all trades who does the dirty jobs for me, and I just listen to the music!
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Post by jj2106 on Dec 31, 2018 11:02:20 GMT -5
After a few weeks of use, I must admit I am disappointed with the auto-on feature. It switches off too quickly, and requires a significant input signal before switching on again. This is not good for classical music. As I can't use the trigger function (no preamp, just a basic DAC), I'll have to go back to the always-on mode. And since I have a superb vintage Fisher amplifier (2x70W @ 8Ohms), I may have to resell the A-100. Shame.
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Post by garbulky on Dec 31, 2018 12:31:39 GMT -5
After a few weeks of use, I must admit I am disappointed with the auto-on feature. It switches off too quickly, and requires a significant input signal before switching on again. This is not good for classical music. As I can't use the trigger function (no preamp, just a basic DAC), I'll have to go back to the always-on mode. And since I have a superb vintage Fisher amplifier (2x70W @ 8Ohms), I may have to resell the A-100. Shame. To each his own but the A-100 uses very little power. I leave mine turned on.
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Post by jj2106 on Jan 1, 2019 3:24:43 GMT -5
OK, I will leave mine turned on as well. Thanks and a happy new year.
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