Series 1 meter issue and general service

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Topher Mohr

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Apr 7, 2025, 3:18:59 AMApr 7
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Hi all,

Long time lurker, first time caller. I have a 26 channel/8 bus Series 1 in Culver City, CA. Mostly working great, love the sound and ease of use. I mostly use it to track full bands, I send the direct outs of each channel to an Apogee into Pro Tools and aside from a few pesky gain knobs it works great. 

My issue has been when I mix through it I keep blowing speakers just on the left side. There is a spike on the left meter only when no audio is passing through it but I don't detect any actual noise that would be problematic so I figured it was just a meter issue. Wondering if it could be sending some inaudible noise to the left speaker that is causing it to blow? I've sent just that spiking channel to a track in Pro Tools but I don't see any audio registering so I still think it's just a meter issue but I can't think of what else could be causing speakers to blow. Any thoughts?

Also wondering if we know anyone in Los Angeles that works on these? I had a buddy help me get it up and running and it's mostly great but would love to have someone who really knows what they're doing go through it and get in tip top shape. 

Thanks!
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Robert Stevens

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Apr 8, 2025, 12:10:04 PMApr 8
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With a multimeter in DC voltage mode, check to see if there is a DC voltage on the left output. That could both cause the meter to light up and blow out speaker cones. 

Topher Mohr

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Apr 8, 2025, 2:17:04 PMApr 8
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Ok thanks I’ll try this!


Topher Mohr

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On Apr 8, 2025, at 9:10 AM, Robert Stevens <stevens.ro...@gmail.com> wrote:

With a multimeter in DC voltage mode, check to see if there is a DC voltage on the left output. That could both cause the meter to light up and blow out speaker cones. 
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Robert Stevens

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Apr 8, 2025, 2:21:48 PMApr 8
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FWIW, I've never seen an line level audio signal blow a speaker with DC voltage as most amps would block the DC pm the input side, but I definitely seen audio amp's speaker output with DC on it blow up a speaker. 

Topher Mohr

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Apr 8, 2025, 2:32:44 PMApr 8
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Noted. I’ll see what I can figure out and keep you posted if I find anything interesting.

Topher Mohr

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On Apr 8, 2025, at 11:21 AM, Robert Stevens <stevens.ro...@gmail.com> wrote:

FWIW, I've never seen an line level audio signal blow a speaker with DC voltage as most amps would block the DC pm the input side, but I definitely seen audio amp's speaker output with DC on it blow up a speaker. 

Ike Zimbel

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Apr 8, 2025, 2:40:50 PMApr 8
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It could also be either a sub-sonic thing, like the 30Hz Slate tone, or a high-frequency oscillation. Dissecting the blown drivers can give some clues. It’s been a minute, but I believe LF or DC will send the voice coil out of the gap, and HF oscillation will leave a burn mark on the voice coil in a limited location. 

   ~Ike Zimbel~

   Wireless frequency coordination specialist.

   Manufacturer's Representative

   Radio Active Designs (Canada)

       ~416-720-0887~

FCC:WRBX645

   http://www.zimbelaudio.com/wireless-frequency-coordination/


On Apr 8, 2025, at 2:21 PM, Robert Stevens <stevens.ro...@gmail.com> wrote:

FWIW, I've never seen an line level audio signal blow a speaker with DC voltage as most amps would block the DC pm the input side, but I definitely seen audio amp's speaker output with DC on it blow up a speaker. 

Topher Mohr

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Apr 8, 2025, 2:43:50 PMApr 8
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Interesting. I have one of the blown drivers at a speaker repair shop now. I’ll see what the diagnosis is. 

Topher Mohr

Sent from Space

On Apr 8, 2025, at 11:40 AM, Ike Zimbel <ik...@zimbelaudio.com> wrote:

It could also be either a sub-sonic thing, like the 30Hz Slate tone, or a high-frequency oscillation. Dissecting the blown drivers can give some clues. It’s been a minute, but I believe LF or DC will send the voice coil out of the gap, and HF oscillation will leave a burn mark on the voice coil in a limited location. 
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