Since
@Rozeqloud has raised several questions regarding the connectivity of N8, I'll try to explain this in more detail.
Let’s recap the brief introduction form Cayin N8 Press Release:
Cayin N8 offers six input and output options so that you can integrate the DAP into your home audio system flexibly. The I2S Digital output (via micro HDMI) is by far the most sophisticated digital interface from N8, it can connect to I2S input of our CS-100DAC and N8 will become a high performance digital transport. We have also embedded the S/PDIF Coaxial signal into the Type-C secondary bus pins. This is our proprietary design and N8 users will be provided the necessary adapters to connect the player to portable and desktop DAC. N8 also supports USB Audio, it can function as USB DAC (input) or USB Transport (output) through its Type-C USB interface. Last but not least, N8 comes with dual line out design. On top of the commonly used single-ended line out through the dedicated 3.5mm port, Cayin has added a ground connection to the "Pentaconn" connector so that N8 can facilitate full balanced line out through the shared 4.4mm TRRRS port.
For the sake of convenient, let’s list all the options as follows:
- Single-ended Headphone Output (3.5mm TRS)
- Balanced Headphone Output (4.4mm TRRRS)
- Single-end Line Output (3.5mm TRS)
- Balanced Line Output (4.4mm TRRRS)
- I2S Digital Output (mini HDMI)
- S/PDIF Coaxial Digital Output (Type C, embedded)
- USB Digital Transport or USB Audio Output (Type C)
- USB DAC or USB Audio Input (Type C)
(2) and (4) shared the same 4.4mm connectors, (6), (7) and (8) shared the same Type-C connectors. (6), (7) and (8) are digital connections exist in current Cayin DAPs, please refer to my
previous explanation for more detail:
On top of a Type C to Type A standard USB cable, N8 also comes with the following cable accessories:
For the sake of simplicity, I'll address these as TypeC/RCA, TypeC/3.5, 4.4/XLR and 2.5/4.4 respectively.
Headphone Connections:
(1) 3.5mm Singled-end headphone phone output is the most common form of headphone connection for portable audio devices. Most IEMs and portable headphones will come with a 3.5mm cable. In case you want to connect full size headphones with 6.35mm connector to N8, you’ll need a 6.35 female to 3.5mm male adapter which is commonly available in audio shops.
(2) Balanced headphone is probably the most complicated and non-standardized connection in current audio market. For portable applications we have 2.5mm TRRS, 3.5mm TRRS, 2x3.5mm TRS and 4.4mm TRRRS. Cayin has adopted 2.5mm TRRS connectors for balanced headphone previously. We switched to 4.4mm TRRRS with N8 in view of the technically advantages of the new connector but we have provided an custom designed 2.5/4.4 L adapters so that the 2.5mm balanced IEM/headphones can use the N8 balanced headphone output conveniently. However if you were to use balanced headphones with the less popular 3.5mm TRRS or 2x3.5mm TRS connectors, you need to get an adapter to convert these into either 2.5mm or 4.4mm connectors.
Balanced headphone for desktop system might involve XLR4 or dual XLR3. The easiest way to use these headphones with N8 is to custom make a XLR4(F) to 4.4mm or dual XLR3(F) to 4.4mm or 2.5mm adapter, the later will require adding our 4.4/2.5 adapter before you can use it in N8.
If you have a balanced headphone (terminated in 2.5mm or 4.4mm), you can convert it into single end with appropriate converter 2.5mm to 3.5mm or 4.4mm to 3.5mm adapter. In this arrangement, you will duplicate the ground of 3.5mm output from the DAP to left and right ground of balanced connection. However if you are using a single-ended headphone (terminated in 3.5mm), you cannot use a 3.5mm to 4.4mm adapter to plug that into the balanced output of the N8, In tis case you’ll merge the L- and R- into one stream feeding the 3.5mm ground. Duplicate is not a problem, it won't sound better, but it won't crash either. Merging is dangerous, it can cause damage to your headphone, and in some cases, damage your DAP in due course.
Analogue Line Out
Line out is a fixed value output (i.e., not altered by volume control) allow you to connect your DAP to audio input of an amplifier, this can be your home audio system or a portable amplifier. In DAP there are two types of line out in general: one that bypassed the headphone amplifier circuit completely (e.g., Cayin N5ii) and one don’t (e.g., N3). By passing headphone amplifier will offer a cleaner signal and is preferred from technical point of view.
(3) 3.5mm singled-end is the most common form of a line out connection in DAP. N8 offered a dedicated 3.5mm line out port to minimize confusion with 3.5mm headphone output. On top of completely independent form the headphone circuit, the N8 is more than just a direct output from DAC chipset, its has it own signal processing circuit so that it will meet the 2.0V industrial standard, can handle high impedance loading and remain quiet and non-distorted during transmission. You can connect to a portable headphone amplifier with a short 3.5mm to 3.5mm interconnect, or connect to a desktop integrated amplifier or pre-amplifier through a 3.5mm to 2xRCA cable. All these are commonly available in the market.
(4) N8 iis our first DAP offers genuine balanced line out with rated output at 4.0V. We have taken full advantage of the 4.4mm pentaconn balanced connector to facilitate ground connection on top of the L+, L-, R+ and R- signal path. Since the De facto standard of balanced connection is dual XLR3, Cayin has provided a 4.4/XLR adapter to, when used with a pair of standard XLR interconnect, connect the N8 to a desktop headphone amplifier or speaker integrated amplifier and using the N8 as analogue source.
Digital Connections:
(5) N8 is our first DAP equipped with I2S output, this is by definitely the most preferred digital interface both in terms of digital capability and audio performance. If you are using a DAC with compatible I2S input, definitely give this a try. Since we used HDMI for the i2S connections in iDAP-6 and CS-100DAC, it is natural that we adopt mini HDMI connector for I2S implementation with N8. To connect N8 to external DAC such as CS-100DAC, you need a Mini-HDMI to HDMI cable or a HDMI to Mini-HDMI adapter and then connect to DAC with a standard HDMI cable. These cable or adapters are readily available in the market but we advise you to use a short HDMI cable (1m or below) whenever possible.
(6) This is a proprietary implementation for Cayin DAP. Cayin has developed two type-C S/PDIF coaxial cables in the past:
CS-40TC35 and
CS-30TCR. The TypeC/3.5 is functionally equivalent to our CS-30TCR and it will connect N8 to portable DAC/amp with 3.5mm TS mono coaxial input, typical examples are such as Mojo and Hugo2. On the other hand, the TypeC/RCA adapter, when used with a standard RCA S/PDIF coaxial cable, enables you to connect the N8 to a desktop DAC and using the N8 as digital source. Please be reminded that off-the-shelf Type-C cable will not compatible with this design and our Type-C coaxial cable will not compatible with standard Type-C devices such as Android mobile phones or tablets.
(7) There are two typical scenarios when N8 is used as USB Digital Transport. Typical desktop DAC use USB-B (make sure you don’t confuse with USB mini-B or USB micro-B) as input connector, so when you connect N8 to desktop DAC, you need a USB-C to USB-B cable. You can also connect N8 to portable DAC/amp but you need to pay attention to the USB input of the DAC/amp. For example, if you connect N8 to Chord Hugo2, you’ll need a USB-C to micro USB cable. You can buy standard off-the-shelf cable for this application conveniently.
(8) If you are going to us N8 as USB DAC for your computers, all you need is a standard USB-C to USB-A cable. In fact, the supplied USB-C in N8 package can be used for charging, data transfer and USB DAC already.
PS: I am not too sure I name the cables and adapters correctly, please feel free to correct me if I didn't get it right.