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miniDSP Low cost, modular Digital Signal Processor (DSP) kits for the DIYer from miniDSP.

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Old 28th January 2014, 02:07 PM   #1
SunShade is offline SunShade  Italy
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Join Date: Nov 2004
Location: Italy
Default 2x4 output impedance, DC filter help?

I need to interface a 2x4 minidsp with an inverting amplifier, which has low input impedance.
What is the current driving capability of the minidsp output stage? I understand the output impedance is 680 ohm.
Do I need a DC blocking cap at the input of my amplifier, should I decide to add a voltage follower?
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Old 29th January 2014, 04:47 AM   #2
Davey is offline Davey  United States
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Join Date: Dec 2001
Location: Bremerton, WA.
The miniDSP unit already has a DC blocking capacitor, so you shouldn't need another.

Inverting amplifiers don't necessarily have low input impedance. However, I imagine it will be quite a bit higher than 680 ohms, so you shouldn't have any issue.

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