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Old 05-14-2011, 01:11 AM
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NwAvGuy NwAvGuy is offline
Join Date: Feb 2011
Location: Northwest USA
Posts: 176
Default AMB Mini3 Portable Amp Detailed Review

I gave the AMB Mini3 (a DIY portable amp that's also available assembled) the full bench test treatment and it did respectably well in a few areas, but failed to meet many of its published specs--some by a wide margin. It's not very suitable for low impedance loads where it has relatively high distortion at most any output level.

A lot of its problems can be traced to using a virtual ground ("3 channel active ground" in AMB lingo). Such grounds work around having only a single battery in a portable amp, but in this case, it comes with significant side effects. I ended up writing a second article just about virtual grounds and 3 channel designs.

AMB Mini3 Review & Measurements

3 Channel Headphone Amps & Virtual Grounds

Questions and comments, as always, are welcome!

Personal Audio Blog: (non-commercial, objective reviews & commentary)
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amb mini3, measurements, portable headphone amp, review

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