"If it measures good and sounds bad, it is bad.
If it sounds good and measures bad, you've measured the wrong thing."


Building a reference system - Part 2: Glenn's headphone amplifier

Posted by Amine Slimani on October 21, 2014 at 2:25 PM Comments comments (2)


The story of Glenn’s OTL headphone amplifier started as that of a relentless endeavor to make the ALO recabled Beyer T1s sound as good as it was possible, and ended up being that of finding the center piece of my system that will probably outlast many other major components.

At the time of the pur...

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Preview : Glenn OTL headphone amplifier

Posted by Amine Slimani on November 25, 2013 at 4:25 PM Comments comments (0)

As I was looking to upgrade my headphone amplifier for the ALO recabled Beyer T1s, it was clear that I needed to get a tube OTL amplifier as recommended by many people who have tried that combination.


While I was about to order the Woo Audio WA2 (OTL amp based on 6AS7 / 6080, I was lucky enough that Stavros (rosgr63) pointed me towards Glenn who makes some very interesting t...

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3 Tweaks for Cheap!

Posted by kboe on September 20, 2011 at 1:15 AM Comments comments (5)

October 2011

Tweaks for the HiFiMan EF-5 Hybrid Headphone Amp

Reviewer: Kevin Pope

Transport: 160GB iPod Classic loaded with AIFF

Source: Pure i20

Amp: HiFiMan EF-5

Headphones: AKG K-702

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Review of the Audio-gd DAC 19-DSP & C2 headphone amp - The ACSS (Audio-gd Current Signal System) connection

Posted by Amine Slimani on April 18, 2010 at 10:53 AM Comments comments (0)


For those wondering what ACSS means it is the acronym for Audio-gd Current Signal System which is similar to Krell’s CAST system.


What it means that when you connect your whole chain in ACSS, there are 2 interesting things:

1. The signal is being transmitted in the current domain, which minimizes the effect of the cables on the transmission.

2. The whole system acts as one single gai...

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Review of the Audio-GD FUN - A modular Dac / Headphone amp / Preamp

Posted by Amine Slimani on January 24, 2010 at 6:41 AM Comments comments (0)

I - Preamble:

The Audio-GD FUN is the replacement of the Compass which has been extensivelydescribed here by Currawong on, so I won't go into the details. 


Like the Compass, it is a DAC / pre-amp / headphone amp in one enclosure. Butthe novelty here is that has a modular design that lets even the unskilled userto replace different modules to tailor the sound of the FUN accordingly.


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