Tariff included in price $134.00

* SPECIAL For customers who had their unit upgraded in the past 12 months.*  $1999

Leave a note in the comments field at checkout stating your original purchase date.

* We may consider older perchases also... Just ask.

This sale inludes our Signature Series DAC upgrade with our R-core internal power supply installed.

1) Transformer replacement. Replaced the Edcor 150 150 cheap transformers with premium Nickel APS Audio R2 Transformers designed to meet extreme audiophile requirements. These transformers also brings up the gain to standard levels.
2) VOCM upgrade. The VOCM of these units did not have a low enough impedance for the video opamps used. We corrected this for the Signature Series by adding very high quality SMD poly caps (not the standard Vocm caps used on non-Signature Series) on each opamp power circuit which lowered the impedance the correct amount.
We also replace all 1% thick film resistors with 0.01% thin film resistors as part of our signature series upgrade.
3) RF.EMI shielding was added where needed This lowers any noise from entering critical circuits.
4) Performed DC offset tune. Lowers low frequency distortion abd increases dynamics. This works together with our new R2 transformers. The DC offset issue is a real problem in these DS DAC's. We originaly thought replacing resistors R5 and R6 with better quality ones would fix this issue however we were wrong. In certain situations, it can make it worse. We had to develop a test fixture in order to help us fix this problem. Although it requires a lot of time, the effort is worthwhile because it extends the life of the transformers and significantly enhances sound quality.
5) Digital Noise Eliminator for the USB port
6) In the stock power supply we tighten the Power Transformer (All come loose at the base)  We substitute the rectifier diodes with ultra-fast recovery diodes and separate the 5v regulators to provide the digital input board with its own clean, low-noise, regulated power source
 

We take a stock MK1 and compleatly refurbish it with our new Rev 2 transformers, RF shielding, Power Supply upgrades including Tighten re-attach Power Transformer (All come loose at the base)
and tune the DC offset. 

What you get is an incredable sounding DAC that outperforms even the newest MK2 DAC even with our nickel transformers installed.  The Signature Series can be idenified by the new APS Audio Badging on the front.

This is a Level 2 upgrade.

Normaly $3995

This PLUS series addition is a Level 3 upgrade. This is the very best and most expensive however we feel it's worth every penny.

It includes everything in the Signature Series PLUS a super high quality internal linear power supply for the analog board.  It includes isolating filters from the digital supply.  This upgrade ads even more fine detail and increased REAL factor.  Percussive instruments sound so real and dynamic.

We have been working on finding the very best supply for this application and we feel we nailed it.

We use the complete bottom of the DAC for the heat sink keeping the internal temperature low. We use only the best capacitors and diodes available as well as using a high quality discrete circuit with a MOSFET (attached to the bottom of the unit) to regulate the voltage. The R-core transformer is icing on the cake and is very low noise especially with the thick copper flux band.

Signature Series $3995 + PLUS $829 = Total $4824 Normaly $4394 for our Signature Series PLUS (Level 3) The very best!

VIP Customers get all this upgrade to their unit for just $1499 plus return shipping.