I got myself a stepped attenuator and a G.E.C CV 2523 tube. Read about it here:    http://diy.koenigs.dk/2014/03/18/stepped-attenuator-legendary-g-e-c-cv-2523-tube/   Tight fit huh?

I made a write-up about building a O2 amplifier with integrated DAC. I hope you'll find some inspiration for your own DIY projects.   Go here for the full write-up: Objective2/ODAC Illustrated write-up     Custom front panel with power plug removed.      Laser cut front panel  ...

I made this little write-up illustrating the process of making the Bottlehead Crack and modding it.   There are 5 parts, but I'm still missing one article about capacitor upgrades for now. I hope you'll find some inspiration here, if you haven't made a Bottlehead Crack yet.    Cabinet and...

Added a few sections to the write-up. Cheers.

Objective2 Amplifier + ODAC Illustrated Write-up   http://diy.koenigs.dk/2014/02/21/o2odac-amplifier-and-dac/        

HI. It's just glossy varnish with 400 grit sanding between the layers. After the last coat of varnish is completely hardened, it has been polished with furniture polish.

  I have just finished this Bottlehead Crack. Default cabinet with three layers of chestnut wood stain, five layers of spar varnish with 400 grit sanding between and a polish of the varnish after a week of hardening.    The panel has been spray painted with 8 layers of hammered dark grey...

      I just made a custom O2 amp + ODAC, but I didn't like the front panel with the power plug in the front. So I designed one myself with a laser engraved silver front and 2 mm acrylics on top of that. I made 4 spare ones. The front panel is 1mm larger around the edge, than the...

Quote: The ones returned and refurbished was bought by another user, they are the only ones that had a faulty driver, and now they are fixed for you and upgraded to MK-II   I just did the upgrade, and I took about two hours including the meassuring. Here are the result. The grey...

Quote:   Actually jfrocke changed his mind and the last pair was sold to devouringone3 instead. I accepted to upgrade them to MK-II before shipping.   I am happy that the last pair is sold to someone who hopefully will like them very much - in the end, this is what is most important...

Due to other projects, I will not be making any more KODA^2 headphones - at least not in near future.   But I do have one pair for sale, except my own private set of course. These are sold at a reduced price at $450 down from $599, because they are "refurbished". They were sold and then...

Quote: I will try that on monday

Quote: Already did that. Bass port tuning and tuning of the dampening felt bass port. :)  

Quote:   I have applied 1/3 octave smoothing. It's the standard setting in HOLM impulse.   Here is the raw response:  

Quote: Seems like sound signature is preserved even when the frequency response is made more linear. The sound is as vibrant and smooth as ever. The soundstage and detail is there too. So it's all good :D