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Found 619 results

  1. Item: Marantz HD-DAC1 Location: Perth (Willagee) Price: $780 Item Condition: AS NEW, boxed Reason for selling: Using Cambridge CXN streamer as DAC/preamp Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Comes in original box. Lots of reviews on Net. Postage for Australia $40. No time wasters, please. Pictures:
  2. Item: M2Tech EVO DAC TWO DAC 32 Bit DSD/DXD Location: Forestville NSW Price: $500 + postage Item Condition: Used, good appearance Reason for selling: NLR Payment Method: Pickup - Cash, Paypal, EFT PayID Extra Info: I'd bought this new and it has been a good and flexible DAC when needed. Comes with remote and volume control. Boxed and ready to post. One point to note is that it is by default USB bus powered ie it gets it via the USB cable connected to the source. The optional choice (and I'd recommend) is to use a Linear Power supply (LPS). The input Voltage is pretty flexible with 7.5V to 15V. Was bought about $800 - see current advertisement here https://www.ebay.com.au/itm/M2TECH-EVO-DAC-TWO-DAC-32-BIT-DSD-DXD-NUOVO-GARANZIA-UFFICIALE-ITALIANA-/252599099022 Let me know also if you want interconnects, USB cables, even a LPS (I have a few options for all of these). Manufacturer site here - http://lnx.m2tech.biz/products/evo-two/evo-dac-two/ link to manual - http://lnx.m2tech.biz/wp-content/uploads/2017/06/Evo-DAC-Two-User-Manual-PrA.pdf Pictures: first two are stock
  3. Item: FiiO E17 portable DAC/amplifier + E09K desktop dock Location: Sydney Price: $120 Item Condition: Excellent, except for slight display burn in (see below). Reason for selling: Upgrading Payment Method: Pickup - Cash, Post - Bank deposit Extra Info: The E17 has slight display burn in (common issue), only really visible when using the menus when highlighting the middle option (see pic below). Otherwise both items are in as new condition as used as entirely as desktop unit. E17 provided with box (as shown) and all included bits and pieces. E09K is just unit and power adapter (not shown in picture). Pictures:
  4. Item: Vitus Audio RCD100 Location: Blackheath NSW Price: $7900 now $7400 Item Condition: perfect Reason for selling: I really want this sold, at this point to fund other hobbies. I believe this is the cheapest this unit has ever been offered on Stereonet, and this is also almost certainly the lowest hours used, in commensurate condition. A world class DAC, with a matching CD player thrown in for free. A number of reasons have led me to the decision to part with my stereo, but ultimately work has meant I am simply not listening to a beautiful stereo in a big house that I am never in. So I am downsizing, and with it selling a stereo that needs room to breathe. This is an opportunity to pick up some mint condition items that have very low hours on them. I also still have two voodoo power cables left. Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: this unit was bought from the Australian importer as New in 2014, and has spent over half it’s life in its original box hence the sale. It is literally perfect condition with less than 500 hours clocked. It was paired with the matching RI100 and a pair of Sasha’s, both already sold. This item would be ideal for a new buyer. I can’t find a fault with it. No scratches, marks, or fading. It sounds as good as the reviews say, and retailed new for $18,000, representing a saving of over $10,000 as I would like it to sell promptly. Pictures:
  5. Item: Schiit Jotunheim headphone amp with original DAC module Location: Hobart Price: $549 + postage Item Condition: Mint Reason for selling: Upgrading Payment Method: Cash, Paypal, bank transfer Extra Info: Original AK4490 usb DAC module installed. Excellent all-in-one component. Great synergy with the HD650. Pictures:
  6. Item: Audio Aero Cd players, Dacs and Amps Price Range: Any Item Condition: Used Extra Info: I have one Audio Aero product which I find fantastic, so I would like to have more. It is also a fact that the range had many issues and there are many bricked/obsolete/broken/half working/not working products all over the world, especially Cd players. There may be ways I can get these non-working items working again. Anyway - I am looking for those items that people don't want/need. Please and thanks.
  7. dolphy

    FS: Rega DAC V1

    Item: Rega DAC V1 Location: Sydney Price: $400.00 + Postage Item Condition: Used - In good condition, first owner Reason for selling: Upgraded Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: I'm the original owner and it has been taken well care of. I've just noticed that there are some minor scratches on the face plate and I have prices accordingly. The DAC performs flawlessly, grab yourself a great DAC at a bargain price. Pictures:
  8. Item: Antelope Zodiac Gold Dac / Voltikus Power Supply with extra Location:Mill Park Price: $2500 Item Condition:7/10 Reason for selling:Downsizing Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: It's time to part with the dac now Antelope Gold with PSU is a great combo that has obtained great reviews around. And to get the best out of it, I replaced original dc umbilical cable with Paul Pang's (PPA audio )Custom Dc cable and Revelation Audio labs's Parable CryoSilver Reference umbilical power cord(Jeezz,that's long) To be honest,I'm done with RAL dc cable as those of who owned their dual usb cables might agree RAL's wire can dramatically bring up the clarity and resolution. However, Brad(RAL) got the wrong Wiring on the mini xlr end so I had to rewire it by removing the heat-shrink tube as I don't want to spend another couple months for the cable to be delivered:( ,sonic wise no difference IMO BTW,Those AudioCadabara brand isolation rca cups will remain on the unit unless you wish them off Some reviews below http://www.6moons.com/audioreviews/antelope2/1.html https://www.whathifi.com/antelope/zodiac-goldvoltikus/review Update:just realized on the first pic there are two red marks shown on the Power supply.Those are dirts and has been removed. Pictures:
  9. I am no longer a virgin to an external dac. Almost 30 years of Audiophiling without ext. dac I am now orgasming chord qutest..what a product, a work of art indeed and the sound to satisfy my ear drums for many years to come. Q. Could someone please advise what (line level output) voltage setting for an integrated amp. (SV-238mk) 1v, 2v or 3v?
  10. Item: Audiolab M-Dac Location: North Sydney Price: $550 Firm Item Condition: As New Reason for selling: No longer used Payment Method: Pickup / Post $50 Aus Wide
  11. Item: Audio-GD DAC model N17.2 Location: Sydney Price: $300 Item Condition: Excellent - As new condition Reason for selling:NLR Payment Method: Pickup - Cash - Can ship as buyer's cost. Extra Info: Pictures:
  12. ZOOTYtooty

    FS: Nuforce Pre amp $450

    Item: NuForce AVP18 Location:Maitland have all packaging will post Price: $450 Item Condition:Used Reason for selling:Sooo much gear Payment Method: Pickup - Cash, Paypal, COD Only Extra Info:This things a killer! Probably the best DAC pre I've ever owned. It has the ability to set crossover points and do room correction. Sound & Vision Magazine 6 February 2014 You’ll easily get through your diet of high-def viewing and listening with this great-sounding surround processor that works without a hitch. Fulfills your innermost audiophile aspirations, Simple operation, Excellent proprietary room EQ Ronald K Wills 5.0 out of 5 starsFantastic sound quality that is a joy to listen to music December 1, 2013 I really enjoy this AV preamp but you may want to read all my comments to see if it would be best for you. I was looking for a DAC preamp and came across the NuForce. What I liked about it was its simplicity - 4 HDMI in along with Toslink and SPDIF inputs. I play stereo music 95% of the time and use it as an AV Processor about 5% of the time. I am currently set up as a 2.1 system, not surround but will be adding an additional amplifier for a 4.1 system (without center channel) soon. The music quality of this AV preamp is why I gave it 5 stars. I recently sold the very highly rated Wyred 4 Sound DAC2 which sells for $1,500 and replaced it with the NuForce. The DAC2 is a highly rated stereo only DAC that excels in its price range. The amazing thing is that I enjoy the much richer sound of the NuForce over the Wyred 4 Sound unit which sounds a little lean to me. My speakers are Magnepan 1.7s, amplifiers are the amazing Odyssey Khartago/Kismet mono blocks, subwoofer is a Rythmik F12 and all wiring is by Wireworld. The sound that I am getting is nothing short of spectacular. The clarity is amazing, voices are startlingly real and the naturalness and tonal colors are fantastic. You get a nice sense of depth when the recording is done in natural space, such as a church or live concert, and works well with all forms of music. https://www.google.com.au/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjG0Z3Fiq_aAhVOO7wKHXjpDdsQjRx6BAgAEAU&url=http%3A%2F%2Fwww.avsforum.com%2Fforum%2F90-receivers-amps-processors%2F1490124-nuforce-avp-18-mch-300sec7-personal-review.html&psig=AOvVaw2AMPdKz04mUO_fty6gmklN&ust=1523428164261929 Pictures:
  13. Item: Luxman DA-06 USB DAC Location: LWA HQ 64 Burns Bay Road, Lane Cove NSW Price: RRP $4999 Our Price $1800 Item Condition: Excellent 2nd hand Condition Shipping: We can ship to any location in Australia, price is on application Payment Method: Credit Cards, Cash, Bank transfer, PayPal Extra Info: Just traded high quality DSD digital audio and USB input DA – 06 D/A converter. This is in 110 Volt spec with a 240 spec transformer (pictured). This is the current model which has a RRP of $4999 Luxman say: Every component regardless of price or prowess of the designer has a sonic signature. DA-06 DAC reproduces music with a rich tonal balance and silky smooth midrange, yet a satiating amount of transparency. It’s capable to reproduces both PCM and DSD with its lush signature Luxman sound. And enables all listener to get lost in the music rather than the format. DA – 06 product platform incorporate the large-scale analog circuit, also corresponding to regenerate the USB input up to 384 KHZ / 32 bits PCM data and 5.64 MHz DSD data of digital circuit, belongs to A high level of D/A converters. Specifications: Type 2 channel D/A converters Appropriate sampling frequency USB input(PMC): 32k, 44.1k, 48k, 88.2k, 96k, 176.4k, 192k, 352.8k, 384kHz (16, 24, 32bit)USB input(DSD): 2.82M, 5.64MHz COAX/OPT/AES/EBU input: 32k, 44.1k, 48k, 88.2k, 96k, 176.4k, 192kHz (16,20,24bit) Digital Input USB (Type 1 system, COAX 2 system, OPT 2 system, AES/EBU(XLR) 1 system Digital Output COAX system, OPT 1 system Analog output RCA unbalanced system, XLR balanced 1 system Cable output voltage /impedance 2.5 v / 300 Ω (imbalances) and 600 Ω (balance) Dimensions (W x H x D) 440(W) x 92(H) x 400mm(D) Pictures:
  14. Item: MHDT Tube DAC - Paradisea+, Canary or Orchid Price Range: $400 (Paradisea+) -$600 (Canary or Orchid) Item Condition: Used Extra Info: Hi, I've got the original Paradisea from MHDT but unfortunately it doesn't have USB input. Keen to find one of these 3 models as it apparently has a similar sound characteristic as the original Paradisea. I am in Sydney and happy to cover the cost of postage and PayPal fees. Cheers John Please don't forget to report your post as FOUND when possible. (You can now delete this text).
  15. Item: Exogal Comet DAC with Power Supply Upgrade Location: Perth Price: $1800 plus any fees packing paypal etc. $3000 US new and will donate to SNA. Same price as paid 2 weeks ago and Galatic soap paid from Tivoli the month before so firm. Item Condition: Good as per Tivoli description. Came as trade in stock from Tivoli in late Feb 2018 who sold to Galatic soap and to me. Reason for selling: Change of complete system means did not need after all. Excess purchase to needs. Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Ready to ship as packed by Tivoli Hifi Nice two box Dac with upgraded comet plus power supply. Quoting Galatic soap he commented on it as follows, 3rd time luck for the new owner. As I have not even unboxed i cannot add an opinion but many positive reviews online and it won the product of the year in Poland amongst many other positive reviews online etc. I had the pleasure of hearing an Exogal Comet without the upgraded power supply a few years ago and I was immediately smitten by it's musical and full-bodied sound. The sound reminded me very much of my MSB Analog DAC & Analog Powerbase which I was using at the time, with perhaps a little more liquidity through the midrange. I was immediately a fan. When this particular Exogal Comet popped up for sale in the Commercial Classifieds section of the forum via the great guys at Tivoli I couldn't help but put in an offer to take it off their hands. My goal was to have the Exogal complimented by one of the new breeds of class D amplifiers sporting Hypex Ncore technology in the second system I was pulling together for our yet to be finished new house we are building. The opportunity to pick up an Exogal Comet with the upgraded power supply was too good to pass up, and knowing I was buying from Tivoli sealed the deal. Unfortunately no sooner had the box arrived that my wife made the point that we couldn't start accumulating boxes as the house was still a good 6 months off being finished (at best). Given all of our storage options have now been exhausted she makes a fair point. Since arriving the Exogal Comet hasn't left the excellent packaging the lads at Tivoli arranged for it. As such, please refer to the link below for the original ad, and pictures of the DAC and PS. I've priced this DAC at the price I paid for it, as such the price is firm. In a perfect world the DAC won't sell, the house will get built and my plan can come together! Pictures:
  16. Item: Arcam irDAC with Linear Power Supply Location: With a friend in Adelaide Price: $495 Item Condition: Mint with original box Reason for selling: Unused as now into balanced audio Payment Method: Bank Transfer Extra Info: I could not believe the puny power supply which came with this lovely DAC so purchased a linear PS and inserted into the container as shown in the pics. Note it is NOT an Arcam PS but is far superior and makes all the difference to the effectiveness of the DAC. The heavy PS brings the all up weight of the package to 2.2 kg . I part with it with some reluctance as it is one of the best single ended DACs I've had the pleasure to own - you can read glowing reports of it on the net but remember those reports are with the original wall wart PS. The linear one with this DAC takes it to a new level. Pictures:
  17. Item: WA7 Fireflies 2nd Gen headphone DAC/AMP, upgraded Electro Harmonix tubes Location: Sydney Northern Beaches, Sydney CBD. Price: $1050 o.v.n.o Item Condition: 10/10 Used but as new, packaged up in original box and wrapping Reason for selling: Looking to upgrade to Chord Hugo2 Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: This amp is just beautiful, both to listen to and to look at. For the money, I think its one of the best out there. Pairs well with HD800S, Fostex TH900 and LCD-X or IEMs. 2 sets of tubes included, the stock from Woo Audio and the upgraded Electro-Harmonix. Purchased 2/5/2017. Very little usage. Have original receipt in pdf. Pictures:
  18. Item: Primare DAC30 Location: Newington, Sydney Price: 700 Item Condition: Used but excellent Reason for selling: Have an all in one system, so no longer needed Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Having jumped into the KEF LS50W, and sold my other gear, except this item, it is a stunning DAC with great connectivity, No DSD, but that's ok. It is sweet , detailed and lovely sound stage. RRP was $3200. The remote is not good, for any Primare, again, doesn't matter as the relay picks up the input. You can buy a media/streaming board to slot in the back if required. No box any longer, manual , remote and power cable. Pickup preferred in Sydney please. Heres' a typical review of the DAC30: http://www.stereolifemagazine.com/reviews/item/964-primare-dac30 Pictures:
  19. Alpine Electrocats

    FS: NAD Hybrid Digital amp dac d3020

    Item: Nad d3020 hybrid amp/dac Location: Canberra Price: $420 Item Condition: Excellent Reason for selling: Upgrading Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: I can post it for $ amazing little amp garnered 5 stars when reviewed by What HIFi. It has numerous inputs- 3 Aux (only one has phono plugs), USB, Bluetooth,2 Optical, and coax Comes with remote control (will swap for an Oppo bop 103 dvd player) Pictures:
  20. Item: Entire system really. Silver Primare integrated i32 amplifier and a black DAC30 24/192 DAC. Also a pair of Rosewood Acoustic Energy AE2s. Stand edition. Location: Newington, Sydney Price: 2500 Item Condition:excellent Reason for selling: Have moved to KEF LS50W and don't need the separates Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: I also have stands if required. Basically I'm minimising components. The Primares are quite new 2014 and the AE2s were purchase as part of a trade at Audio Connection, also in 2014. Happy to discuss finer details with anyone. Pictures:
  21. Item: Klein DAC II Location: Sydney Price: $670 posted Condition: 10/10 Reason for selling: NLR Payment method: Cash, COD, PayPal Extra info: In mint condition, this is version II of the best small Aussie DAC ever made. The main points of difference with respect to the previous version are: - New DAC chip which can read DSD - Display - Remote Control - More filters available I have box, manual and power supply.
  22. Item: OPPO BDP 105 AU - CD, DVD, SACD, Blue Ray player etc. Location: GEELONG Price: $900.00 + postage Item Condition: 9/10 - excellent Reason for selling: No Longer Required Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: This Oppo BDP 105 au Player is in excellent condition physically and mechanically. It comes with the Remote Control, wireless USB Adaptor ( i never used ) , Ethernet cable, Power Cable, Main Packaging Box, Smaller Accessories Box, Instruction Booklet, Original Internal Packaging, OPPO Carry Bag. The unit is safely packaged and ready to go Pictures: The photos illustrate the condition of the OPPO 105 Player and how it is packed and ready to go.
  23. henry218

    FS: AudioGD Master7 DAC

    Item: AudioGD Master7 DAC Location: Castle Hill, NSW Price: $1,800 Item Condition: Very Good Reason for selling: Upgrading Payment Method: Shipping and Pickup - Cash, Paypal (+fees), COD Only Extra Info: Great DAC, Dynamics and Neutrality Pictures:
  24. Item: Chord Electronics Hugo TT DAC/Headphone Amplifier, Pre-amplifier Location: Len Wallis Audio HQ, 64 Burns Bay Road , Lane Cove, NSW 2066 Price: $3000 Item Condition: Very good Payment Method: Cash, Paypal, Bank Transfer, Credit Cards Shipping: We are able to ship to any location in Australia, price is on application Extra Info: This just traded Chord Electronics Hugo TT (Table Top) represents a first class upgrade to virtually any system and is offered with the original packaging. It features extensive connectivity including a USB-B input, XLR outputs, two quarter inch headphone outputs, plus improved performance and features. TT offers remote control, an alphanumeric LED display with input/sample rate data, and improved sonic performance over the small Hugo thanks to supercapacitors. Advanced sample rate capability The Hugo TT can take advantage of today’s advanced studio-master-quality (DXD) music files allowing music lovers to experience music in true high definition, along with the best possible reproduction of CD-quality music. Hugo TT supports up to 32-bit/384kHz audio via coax and USB, and 24-bit/192kHz over optical, plus DSD64 on all inputs and DSD128 via coax or USB (all via DoP). In a key upgrade over the original Hugo, the Hugo TT benefits from a high-quality asynchronous B-type USB connection for both the SD and HD USB input. With two further digital inputs: a (new) BNC coaxial and optical (TOSLink), any connected component with a digital output can benefit from the Hugo TT’s advanced sound quality. Bluetooth To fully integrate with today’s digitally stored media, the new Hugo TT also has A2DP Bluetooth capability and uses a custom-made module with the aptX codec to feed a digital signal directly into the DAC circuitry, so even without cables, music can still be enjoyed. Spartan 6 FPGA The Hugo TT retains the same high-performance Spartan 6 FPGA that enabled Hugo to redefine the DAC genre in 2014. It has the same specification and measured performance as its mobile sibling, a device that “broke all records” for dynamic range in leading UK hi-fi magazine, Hi-Fi World, in the summer of 2014. Supercapacitors Being a home-orientated device, the Hugo TT has been designed to run continuously from the supplied charger, however Chord’s engineers have also improved the battery and added Supercap energy storage, a technology seen in F1 where supercacitors back-up the cars batteries by sharing the load and charge demands, thereby protecting them. They serve a similar purpose in the Hugo TT, extending the battery life as well as improving dynamics and demanding transients in recorded music. Pictures:
  25. Item: Aesthetix Atlas signature monoblocks and Pandora Dac Location: Melbourne Price: $13,000.00 Condition: Used 9/10 Reason for selling: Purchased a new system Payment Method: Pickup - Cash, Paypal, COD Only All packaging, manuals and Remote available. Can ship at buyers cost Excellent condition hardly any marks. Approximately 4 years old $11k for monoblocks & $4k for Dac OR $13k combined Dac has optional, high quality pre-amp section specially designed not to impact on Sound Quality (uniquely uses both analogue and digital domains) Award winners from Absolute sound, Stereophile and what HiFi Amps RRP $21,800 price $11,000 Power Output: 300wpc into 8ohm 600 wpc 4 ohm Input Sensitivity: 60mV (1 watt), 3.1V (full power) Input Impedance: 470K Output Impedance: .25 at 1kHz Signal to noise: 120dB Bandwidth at full power: 4 - 150kHz Rated THD at full power: <1% Dimensions: 18"w x 8"h x 19"d Weight: 70 lbs ATLAS amplifiers can drive virtually any speaker. An innovative hybrid design incorporates a bipolar output stage, bipolar driver stage, and vacuum tube input gain stage. They stand alone as the only hybrid amplifiers with zerofeedback, essential for maintaining harmonic integrity, air, space and coherence. The Atlas provides your choice of full range or high-pass inputs. This unique built-in filter is ideal for speakers featuring powered woofers,such as Vandersteen, or for audio and home cinema systems using outboard powered sub-woofers. Zero feedback, fully differential amplifier with complementary balanced bridge design for open sound. Tube gain stage using one 6SN7 tube per channel provides harmonic accuracy and soundstage layering. Amplifier has a built-in high-pass crossover: 6 dB / octave, 16 settings from 40 Hz to 200 Hz in approximate 10 Hz increments. Single-ended and balanced inputs . Direct input bypasses all crossovers and switching for ultimate purity. Bus technology reduces power supply impedance between output devices for more instantaneous current. Power supply uses two transformers and three chokes. The high current section uses a dedicated transformer and choke input power supply. The vacuum tube B+ power supply has choke input and is discretely regulated. The result is unequalled clarity and control. Cardas patented rhodium-plated binding post with single knob lockdown. Stainless steel cover for transformers prevents magnetic fields from interacting with sensitive audio circuitry, preserving low level musical nuances. Pandora DAC RRP $8,500 – Price $4k The Pandora is a vacuum tube based digital-to-analog converter with one USB and three SPDIF inputs. The Pandora USB solution uses the asynchronous transfer modelicensed from Gordon Rankin / Wavelength Technologies with an ultra-low jitter fixed-frequency crystal clock immediately adjacent to the DAC. This technology allows for jitter levels over one hundred times lower than previous USB solutions. USB is capable of Class 1 audio up to 96KHz / 24bit and Class 2 audio up to 192KHz / 24bit. SPDIF/AES inputs use a unique jitter reduction technology that offers jitter performance on par with asynchronous USB and arealso capable of up to 192KHz / 24 bit. Proprietary DSP The DSP section utilizes the Motorola DSP 56362 for specially designed oversampling filters, which adapt according to the incoming sample rate. Static memory buffering is selectively used to completely isolate incoming data from USB and SPDIF from outgoing data to the DAC. Precision Clocking Theclock section of a digital product is absolutely critical for audioperformance. Any jitter (tiny timing variations) or noise will cause the DAC device to perform analog conversions at incorrect and varying rates, causing clearly audible negative effects. The easiest timing solution - but also themost jitter prone - is to simply allow the DAC to use the clock of the incomingsource device. A slightly better solution is to incorporate an internal clockat the DAC using an off the shelf crystal oscillator to regulate the timing.Pandora takes this a step further by utilizing specially manufactured crystaloscillators custom cut to our exacting specifications. These crystals offer radically lower jitter and noise than any standard issue part. There areseparate crystals for 44.1KHz based sources (44.1, 88.2, 176.4KHz) and 48KHzbased sources (49, 96, 192KHz). The clock section is powered by its owndiscretely regulated power supply, to isolate it from the DAC. Fully Differential DAC Digitalto analog conversion is performed by the Burr-Brown PCM 1792A run in pure differential mode. Differential mode is a critical implementation feature that only amplifies the audio signal itself, cancelling noise and other digital artifacts. The digital side is isolated from the analog side, withdiscretely-regulated separate power supplies for each. Special attention isgiven to circuit layout and component selection. Vacuum Tube Amplification The Aesthetix reputation for state-of-the-art analog stages is continued in the Pandora, which features a current-sourced fully differential zero feedback vacuum tube amplifier (12AX7) being fed from the DAC. Differential amplifiershave the unique ability of rejecting "common mode" signals, particularly useful in digital audio products, where high speed clocks and other digital noise can disrupt the delicate analog circuitry. Both Pandora and Romulus feature Rel-Cap polypropylene coupling capacitors and Roederstein metalfilm resistors. Ground noise is reduced by using two separate, discretely regulated positive and negative power supplies for the voltage gain section. Vacuum Tube Output Stage Outputbuffering is performed by one 6922 per channel, also run in pure differential mode with zero feedback. This is a unique configuration, providing much of the benefit of balanced operation for single-ended outputs. The output section also has separate discretely regulated positive and negative supplies which are completely isolated from the voltage gain power supplies. Power Supplies As with every Aesthetix product, Pandora power supplies received tremendous attention. If a single transformer is used to supply all the necessary voltages and currents in a product, digital noise is allowed to easily traverse the transformer windings through stray capacitance and pollute the delicate analogue sections. Separate windings help, but only a little. The real solution is separate transformers, where no interaction can occur between windings. The Pandora digital / DSP section is given its own transformer and regulated power supply. Individual digital sections are further locally regulated to isolate them from each other. An additional transformer and dedicated regulator are used just for the control system. A further special transformer is custom manufactured for Aesthetix for the analog sections, where six separate windings and regulation stages are used for the critical functions described above. Optional High Resolution Volume Controloption included A high resolution relay-based volume control has been added to allowthe unit to directly drive a power amplifier, ideal for many systems. The volume control for Pandora is very special. Typical digital products control volume entirely in the digital domain, where every 6dB ofvolume attenuation causes a loss of 1 bit of resolution. This means since most listening is done in the -30dB range, if one were playing a CD with 16 bit resolution and attenuating at 30dB, only 11 bits of resolution would remain, an incredible loss. The Pandora and Romulus volume control prevents all resolution loss by operating partially in the digital domain for small 1dB steps and partially in the analog domain using relay-based switched resistors for large 6dBsteps. Using this method, eighty-eight 1dB steps are created with zero loss of resolution. Pictures:
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