Tweak-Fi

Preamble:

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...

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...

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

Preamble:

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...

I - Preamble:

The Audio-GD FUN is the replacement of the Compass which has been extensivelydescribed here by Currawong on head-fi.org, 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.