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• Mac mini 2011 upgrade mac#

Mac mini 2011 upgrade mac#

I'd highly recommend this to any Mac Mini user.Apple has released new firmware updates for a number of its early- and mid-2011 Mac systems. I actually didn't want to stop listening but I felt I had to email you.īlacker backgrounds, better dynamics and voices are so realistic it's almost scary!Ībsolutely the best I've ever heard from my system. With the fan controller installed, everthing is so much better. I've mentioned before that the Weiss is extremely sensitive to power and the incoming signal.īut when the signal is right, absolute magic comes out. It's really amazing! I was already quite happy with the JS2, but this really takes it to the next level. Received the MMK and installed it right away tonight.Īnd.

Ī sample from one of the many e-mails we receive about the listening results after MMK installation: That circuit eliminates the voltage drop of the DC supply cable and ensures instantaneous voltage regulation right at the computer end regardless of spikes in current demand. The MMK also has a coaxial/SMA jack for connection of a cable to support the pseudo-Kelvin-sense feedback circuit of the UpTone Audio JS-2 choke-filtered LPS. To boot and operate a Mac mini that has been converted with an MMK requires a 12V power supply capable of delivering at least 4.5 amps. The 12V input connector to the MMK is a high quality 5.5mm x 2.5mm DC barrel jack (center pin positive). Our unique circuit uses a power opamp, and while we utilize both the tachometer line from the fan and the signal from the motherboard, we completely eliminate the pulses- providing the fan with just smooth and variable DC.

The trouble with PWM fan circuits is they operate at around 25kHz, and the pulses are high current (we measured them from a Mac mini fan at over 500mA)-not ideal in a computer being optimized for audio. (See the excellent and not hard to understand tech explanation of fan control circuits at: PWM Fan Control.

So the method used is called PWM (pulse width modulation), whereby the voltage sent to the fan is a train of DC pulses. smoothly varying the voltage to adjust the speed of the fan based on internal temperature) is prohibitive. So why choose the UpTone MMK? Because it includes the world's first and only linear fan controller circuit for Macintosh computers.Ī little background: 3 and 4-wire fan control circuits are used in many modern computers because the cost, size, and heat to include linear DC control (i.e. The MMK also provides a carefully chosen amount of filtering (a pile of filter caps after a regulated external supply is not good for performance).Ĭonversion of a Mac mini to accept DC power is not new, and pairing the computer with a high quality external linear power supply is one of the best upgrades you can perform on this popular computer. There is no soldering and no cutting of wires required, the procedure is completely reversible, and a toolkit with detailed instructions is provided. The MMK converts a Mac mini to operate on external 12V DC power by replacing the computer's stock switch-mode power supply with a circuit board that fits perfectly in the space vacated by the SMPS. For modern Apple Mac minis (model years 2010, 2011, 2012, and 2014), our unique Mac mini DC-Conversion / Linear Fan Controller Kit (MMK) performs several functions important to elevating the audio performance of this compact computer.