About Chris Brewer

My most recent work and biography is at http://chrisbrewer.me (my home page, by the way). Chris Brewer has worked in both industry and academia for years at the intersection of information systems and communications. His background is in areas ranging from technical consulting with Fortune 500 companies, developing award-winning web sites, publishing the Denver Scene, and operating small business concerns. Chris has a unique mix of in-depth technical skills ranging from web and database development to server administration, and strong creative skills in traditional and rich media. Chris actively illustrates his love for the impact and promise of web-based media by fusing creative and technical inputs into seamless integrated output. Chris is also a dynamic lecturer and an innovative technical instructor, and holds an undergraduate business degree from the University of Colorado.

High impedance headphones on MacBook Pro 2021

Good news for audiophiles out there. Apple’s new M1 Pro and M1 Pro Max MacBook Pros feature an adaptive voltage headphone amplifier, meaning it optimizes itself to the headphones you’re using. With these two models, gone is the concern whether 80 ohm or 250 ohm headphones will work.

“When you connect headphones with an impedance of less than 150 ohms, the headphone jack provides up to 1.25 volts RMS. For headphones with an impedance of 150 to 1k ohms, the headphone jack delivers 3 volts RMS. This may remove the need for an external headphone amplifier.”

So, if you love Beyerdynamic’s DT 990 Pro 250 ohm Open-back Studio Headphones, you can rest assured that your new MacBook Pro will power them with aplomb.


Enable OS X Server Messages (Jabber) account login from different domain

I have various Internet services like email, web and messages running on a Mini server running OS X on a subdomain.

Often, I want services like Messages to appear to use our main dot-com address, yet actually run on our internal dot-net domain.

So, how do I configure Messages server to appear to virtually function on our dot-com, yet still reside on a sub-domain?

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