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DC offset Voltage

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DC offset Voltage

Post by peter chan on Wed May 17, 2017 10:32 pm

May I get some info from all the gurus here?

I understand that it is a safety step to check
the DC offset (in mV at speaker terminals of
amplifier) prior hooking up any speaker system
for any vintage integrated amp and receiver.

However is this applicable to power amplifier?
Stereo and or mono block?

Appreciate any advise and Thanks in advance.

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Re: DC offset Voltage

Post by vt4c on Thu May 18, 2017 3:38 am

No guru... Smile

DC offset voltage of anything connected to the speaker is important; regardless power amplifier - stereo or mono block.
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Re: DC offset Voltage

Post by peter chan on Thu May 18, 2017 12:35 pm

Thx bro.  Very Happy

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Re: DC offset Voltage

Post by peter chan on Fri May 19, 2017 10:01 am

Good morning all  Very Happy

Is it normal that you get a 
DC offset reading which keeps
fluctuating within a range
like +5.0 to + 1.8.
One of my amp gives a steady
reading with no changes.
But there is one with above range readings.
Please advise.
Thx.

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Re: DC offset Voltage

Post by STC on Fri May 19, 2017 10:30 am

Ideally, it should notbe more than few tenths s of mV. For older amps it is possible to reach few hundreds mV. But 5.0 V is too high. Even 1.0V is too high. Please check whether it is V or mV.
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Character sheet
Source(s): Ambiophonics setup.
Amplification:
Speakers: Electrostatics

http://goo.gl/CF1C6B

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Re: DC offset Voltage

Post by peter chan on Fri May 19, 2017 12:06 pm

Hi STC,
It is in mV,
One of my amp does not give a stable reading, 
the reading on my voltmeter keeps fluctuating from +5.0mV
to +1.8mV
Is this normal?
Thx.

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Re: DC offset Voltage

Post by STC on Fri May 19, 2017 12:14 pm

That is very good. Sometimes, it is difficult to get zero due to interference. It also depends on your multimeter. Connect to your speakers and turn it on. If you don't see the cone moves than it should be fine. Anyway, I don't think you will hear a difference even it reads few hundred mV. Usually, the D.C. Protection will kick in unless it malfunctioned.
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Character sheet
Source(s): Ambiophonics setup.
Amplification:
Speakers: Electrostatics

http://goo.gl/CF1C6B

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Re: DC offset Voltage

Post by peter chan on Fri May 19, 2017 3:55 pm

Hi STC
Thx again.  Smile

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