In exclusive partnership with top-tier modification house partsconneXion, Underwood HiFi is proud to offer the following carefully tested performance enhancement packages for the Peachtree Audio iDAC, Decco2, iDecco and Nova.

Sonic improvements with the Level-1 mod are amazing:
Bass and dynamics are dramatically improved. It is now smoother (caps), more transparent (connectors, wire) and imaging and 3-dimensionality are brought to a near world-class level.








Our mod takes this excellent DAC to a level that will allow it to compete with DACs that sell for $3000-4000 plus it has the iPod DAC that makes it a world class tuner with the addition of an iPhone or $200 iTouch.

The Peachtree Audio iDAC is one of our favorite DACs at anywhere near $999. In addition to sounding great it has a digital-direct iPod dock that allows an iPod, iPhone and iPod Touch to connect digitally right to the iDAC without going thru the iPod's analog circuitry. This allows Internet-direct payback of virtually all radio stations as well as sites like Pandora and Rhapsody. We have compared the iDAC to DACs selling for twice its price and it holds its own. Even without the iDock it is superb and one of our our favorites at its price. It features a 32-bit Sabre DAC to dramatically lower jitter on all sources. There are 5 digital inputs in addition to the dock. There are 2 coaxial, 2 optical and one 24/96 USB input to play back high-resolution downloads. Hook up any CD player or inexpensive DVD player for a superb digital playback system ready for the new hi-rez computer downloads. There are transformer-coupled digital inputs and the USB input is galvanically isolated to reduce ground noise from the computer's switching power supply. These are very important features many DACs omit. We love this DAC and have designed a mod to make it compete with DACs that sell for over $3000.

The following details our Level-1 mod to the iDAC [$700 retrofit + freight; $1.590 preinstalled + freight]. The mod was designed by Chris Johnson, founder and former president of Sonic Frontiers:
• 1 x pair of Vampire gold-over-copper RCA jacks
• 26 x Elna RFS–Silmic II series and Nichikon KZ–Muse audio-grade electrolytic coupling capacitors in the output stage and power supply. These are all super low ESL & ESR.
• 2 x Burr-Brown OPA-627AU op amp (regarded as the best IC monolithic op amp made) replace the stock dual opamp. These are soldered to a custom dual DIP adapter.
• 10 feet of WBT solder
• The mod takes 3.5 hours of labor

The following details our Level-2 mod for the Peachtree iDAC [$990 retrofit + freight, $1890 preinstalled].
This creates more transparency, dynamics and resolution over the Level-1.
• 1 pr. of WBT-0210-Cu gold-over-copper NextGen RCAs
• 26 x. ELNA RFS-Silmic II series and Nichicon KZ-Muse audio-grade electrolytic coupling capacitors in the unit’s output stage and power supply for super low ESL & ESR
• 1 x Burson Audio dual discrete op amp module featuring 68 discrete parts on each – far better than any monolithic IC op amp along with a special vertical surface-mount-to-DIP-thru-hole adaptor
• 10 ft. of WBT solder used throughout
•  5 hours labor

Sonic improvements with the Level-1 modification package are:
We improve the midrange and make the unit sound more liquid and tube like. The Level-1 unit now sounds more like a tube amp and less like a hybrid. This was the major goal of Level-1 and we think that we have accomplished our design parameter.
• Imaging is more focused while the entire soundstage is both deeper and wider.
• Transparency is improved over the stock unit and you now get a cleaner look into the musical soundstage.
• Dynamics are improved. It's as though the amp gained in power. The stock unit's real forte is its overall even top-to-bottom performance. The Level-1 adds dynamics and better pace. It seems to play louder on peaks. There is more excitement in the music.
• The unit is quieter, the silences are blacker to resolve more low-level detail and superior 3D ambience.
• Bass response is improved. Both bass depth and midbass slam are better than the stock amp.
The Level-1 modified Peachtree units are much improved and a wonderful front end to build a reasonably priced high-resolution system around. Add a big power amp in the future and the results can be amazing for the money. Used as an integrated amp with DAC, you will be shocked by the quality.

The following details the Level-1 preamp mod to the Peachtree Decco2, iDecco and Nova. This improves the units when used as a preamp, preamp/DAC and integrated amp [preinstalled iDecco2 $1.450 + frt, iDecco $1.650 + frt, Nova $1.850 + frt.; retrofit to Decco2, iDecco or Nova $800 + frt]

Level 1:
• 1 x sheet of SoundCoat chassis damping material cut and applied where applicable.  
• 2 feet of DH Labs 23-gauge Revelation Series pure 99.999% silver solid core input signal wire with Teflon tape-wrap dielectric.
• 1 foot of Kimber TCSS 19-gauge Black Varistrand hookup wire with Teflon dielectric.  
• 1 pair of premium Vampire direct gold-plated-over-copper-body RCA female jacks for preamp output.  
• 6 x Takman Japanese precision carbon film ½ watt signal resistors with 1% OFHC leads .  
• 3 x Nichicon FW audio-grade main power supply electrolytic capacitors.
• 2 x Auricap 2.0uf 200V metalized polypropylene input series coupling caps with Auric lead-out wires. 
• 1 x dual SMT-style Analog Device AD8620 op amp for analog input buffer stage.
• 1 x Reflektor mil-spec ultra low noise 6H23p-eb super 6922 tube of 1980’s vintage.   
• 1 x Azuma precision glazed ceramic 9-pin PCB-mount tube socket with gold-plated phosphor bronze pins.  
• 4 x EAR large compliant sorbothane isolation feet.  
• 10 feet WBT solder used throughout . 
• 5.5 hours labor  


Warranty is one year on all mod work performed and 90 days parts & labor on the entire new amp. We offer a 1-year warranty on mod work only on after-market modifications.

The Level-2 mods to the Decco, iDecco and Nova upgrade the DAC section and are in addition to the Level-1 preamp mods. The Level-2 mods include all the Level-1 mods plus [$1.100 + frt. retrofit, preinstalled Decco2 $1.790 + frt., iDecco $1.990+ frt, Nova 2.190 + frt.]: 
• 2 x Rel-Cap TFT teflon film & tin foil input coupling bypass capacitors.  
• 2 x dual vertical-adaptor Burr-Brown OPA-627 opamp modules for the analog input buffer stage and amp driver stage ... or  
• ... 1 x dual Burson discrete opamp with 82 discrete parts in place of the Burr Brown 627 [adds $250]
• WBT silver RCAs [adds $140]
• 6.5 hours total labor  

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