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      We recommend international buyers to check with us by e-mail about the latest product price and shipment charge for each or combined purchase . Please also note that buyers will have to pay PayPal transaction fees of the total amount while making the payment.
                                                            Our PayPal address : audio-gd@vip.163.com
　

DAC - Compass (Discontinue)

DAC+Headphone amp+Preamp

(The front and rear panel of the final version is designed by Mr. Carl Smith from USA with the help of inputs from members of the Head-Fi community.)

In stock, place order before Friday, can shipping at Sunday.

What's in the final version:
Inc one allen key for users.
The Earth OPA is default.
Change the setup of "Neutral" and "Soft1 to Soft3" mode. Cancel the "Soft 3 " mode, add a "Bright" mode.
The pre-amp line out is default.
The gain will change to 6DB/13DB , users can change the gain with a switch on the back panel.
New panel and rear design, design by Carl Smith from the USA with help from the Head-Fi community.
Used the upgrade RCA sockets on Compass. These sockets are our custom order and plate 24K gold. We wish to make Compass being the best buy gears in near price.
Upgrade the manual on the top board inside.

Choice of power cable appropriate for your country:

When you place the order for Compass, please let us know the type of power cable you require.

Specification
Dimensions: width 250mm, height 75mm and depth 290mm.
Price:
(Excluding shipping charge)
(Inc Default DAC output OPA is our OPA-EARTH. Headphone amp don't had OPA, it is all Discrete transistors compose!)
(Inc one stock power cable, one stock optical cable, one stock USB cable, one stock coaxial cable, one analogy signal cable, some Jumpers ,one allen key .)
(After you make the payment ,please send us an email to confirm.
Because a lot customers' paypal accounts are different from the communicate email, so we can't sure who have paid. If we make something wrong , the customers maybe paid for the other people.)

Please note: If you most time want to listen by coaxial input, we advice you buy a professional coaxial cable for Compass,( the stock coaxial not good), you can buy our Canare coaxial cable with Compass together can save some shipping cost or buy other brand coaxial from other shop.

Shipping Charge: http://www.audio-gd.com/enweb/shipping cost.htm
(After we ship, and while we can check the track No. in the express web, we will send the track No. to you.)
Delivery Notice:
                           http://www.audio-gd.com/consignment.htm

Audio-gd exclusive power cable & Canare coaxial cable：
   Cable links    http://www.audio-gd.com/enweb/en-line.htm
Other Audio-gd Discrete OPA ：
   OPA links      http://www.audio-gd.com/enweb/pro/diy/OPA.htm

　

How to replace the OPA?
If users want to replace the OPA in Compass, please follow the instructions and pictures below. We have introduced special OPA for Compass, which do not require the earth wire to be soldered. So if you are ordering OPA for compass, please specify in the order.
    Discrete OPA installed in Compass do not require extension lead.
    The headphone amp in Compass is all discrete, so it does not have OPA.
    When users want to replace OPA, Please shut down the Power of Compass, and then do the replacement.

Click to zoom
What can you do in "super" mode?
Apart from the headphone amp inside Compass being high performance, when used in the “Super” Mode, Compass will separate the DAC and headphone section completely, (Compass is just like a DAC and a headphone amp built in a single Chassis box, but they are separate and do not overlap each other). In this mode users can input and have the benefit of listening to much high-grade analogue signal through the headphone. At the same time the DAC output can be used by other amps (If "Super" mode is not activated, the DAC can't output to another amplifier, and hence, we consider this mode would allow users to enjoy better SQ).
Click to zoom
　

Full Function:

USB/ Coaxial / Optical / Line analogy Input,

Headphone and DAC output,

Built-in protection circuits for the safety of your expensive headphones. Power on delay 5 seconds then

output , users don't worry circuits hit the extra amp or headphone while power on .

Compass has a gain adjustment function. With the help of the switch on rear , users can choose the headphone amp gain at 6DB or 13DB, to suit headphones with different sensitivity and impedance, like for HD650, 103DB/300 ohm, 13DB gain is fine, while on the other hand, D2000, 106DB/25 ohms, a gain of 13DB will be a bit louder, and a gain of 6DB will be far better. For users that don't necessarily want to change the gain, Compass default gain is 13DB. In which case, if users listen through HD650, the volume maybe turned at 10' clock, and when users listen through D2000, the volume maybe turned at 9' clock. I have used four different headphones while developing Compass, Sennheiser HD650, Akg K701, Denon D2000 and Grado SR80. Please See the picture below.

Moreover, Compass had a "Sound DIY" for users. With the help of two groups jumpers ( don't need any other tool, and will only take around 30 seconds ), users can choose the headphone amp sound signature from "Bright" , "Neutral", "Soft-1", and "Soft-2",The effect will be noticeable and users can make their choice accordingly. We advice users when want to change the setup, shut down the power at first.

Default setup sound color Bright (without all jumps).

We build a high performance headphone amp inside. a separate transistors buffer always for the headphone amp input, the buffer can keep a low impedance feed to headphone amp, even when users use different signal sources. Furthermore, it will also improve the DAC feed to headphone amp .

Compass will come in 100-120V version and 220-240 versions, depending on the geographical location and customer’s choice. The reason we don't make selectable voltage, 1, we are afraid if customers choose the wrong voltage, it will burn the gear. 2, in low quality gear, you can't hear the sound effect with or without selectable switch, but in hi-quality gear, you can hear the difference not only with power selectable switch, but even with power cable.

Compass is mostly soldered or hardwired, because we are convinced that by using sockets, the Sound Quality will be low, but our intention is to produce a Hi-Grade gear, even though Compass is priced low.

　

Hi-End Design:

Separate transistors output stage of DAC part.

Separate transistors regulator power supply.

Separate transistors headphone amp.

Low phase distortion analogy filter amp of DAC part.

Separate and shield install transformer and rectifiers, stop the disturb.

Hi-End Stuffs:

Mostly DALE resistors, EVOX (RIFA) cap, electrolyte Caps are custom ordered from NOVER (The brand from UK), exact matched transistors, ALPS volume pot and ALPS selector and ALPS power switch, RCA sockets are custom ordered and plate 24K gold , Neutrik headphone output socket. All transistors are Toshiba and Hitachi audio products.

All aluminum chassis (Black). Dimensions: width 250mm, height 75mm and depth 290mm. Panel thicknesses 8mm. You can replace Discrete OPA without extension leads.
PCB employs 2MM double copper / stringy board, 70uM copper.
50Watts custom Transformer, input voltage wide at 100-130V / 200-260V .
The lowest jitter DIR9001 is used, other ICs used are PCM2707 and AD1852,DAC output OPA is Discrete OPA .
Neutrik output socket.
To disengage the headphone, Users must first push the red lever

Hi-End Quality:

All workers are Hi-Fi enthusiasts and skilled electronic artificer.

Prior to shipment, the gears will be in the process of burn-in for 100 hours, and undergo a variety of tests.

DAC parts circuit:

Headphone amp circuits:

Power supply circuits: