Cayin C9II Portable Headphone Amplifier
SKU: 94438313512

Cayin C9II Portable Headphone Amplifier

Sale price$1079.55 Regular price$1199.50
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Description

Cayin C9II Portable Headphone AmplifierProduct Highlights 1. Gen5 Nutube 6P1 Vacuum Tube Audio Circuit Cayin has applied this vacuum tube to multiple products, including the N8, C9, N8ii, and N30LE, and now the C9ii. After years of continuous circuit experimentation and technical refinement, Cayin has equipped the C9ii with an adjustable anode (plate) voltage feature and the highly praised Classic and Modern dual tube timbre. This adjustable plate voltage feature offers two levels: high

Product Highlights

1. Gen5 Nutube 6P1 Vacuum Tube Audio Circuit 

Cayin has applied this vacuum tube to multiple products, including the N8, C9, N8ii, and N30LE, and now the C9ii. After years of continuous circuit experimentation and technical refinement, Cayin has equipped the C9ii with an adjustable anode (plate) voltage feature and the highly praised Classic and Modern dual tube timbre. This adjustable plate voltage feature offers two levels: high and low.

1.1 Dual Tube Timbre Circuit

Modern Sound: Introduces a large-loop negative feedback system, with total gain determined by the large-loop negative feedback circuit. By incorporating negative feedback over multiple amplification stages, the total harmonic distortion (THD) will be reduced significantly. The harmonic distortion characteristics and sound signature lean more toward a modern style, with greatly reduced thermal noise and a slightly cleaner tube sound. The original C9 was designed with a similar NFB circuit.

Classic Sound: No large-loop negative feedback; each stage operates independently through local feedback, with the overall gain determined by the cumulative gain of each stage. The distortion characteristics of the tube amplification circuit dominate the sound signature, resulting in a higher THD value. The distribution of harmonic distortion and the sensor signature exhibit a classic vacuum tube amplification circuit, with relatively more thermal noise and a richer vacuum tube presentation. The N8 DAP was designed with a similar NFB circuit. 

1.2 Anode (High/Low) 

Cayin introduces a new feature, “Anode” to C9ii. The High/Low adjustable anode (plate) voltage further enriches and refines the range of vacuum tube timbre. The working principle is that applying different operating voltages to the plate of the vacuum tube alters its operating state, ultimately affecting the sound signature of the timbre circuit. This mainly manifests in changes in audio linearity, and it will adjust the overlay, spectrum, amplitude, and ratio of second-order harmonic, resulting in perceptible audible differences.

∙ Classic + Anode (H): The richest tube sound, with intense emotional depth, suitable for vocal music with a lot of details. 

∙ Classic + Anode (L): Slightly lighter tube sound, suitable for vocals with thicker tones.

∙ Modern + Anode (H): Less tube character, with moderate smoothing in the midrange and a slight sweetness added. 

∙ Modern + Anode (L): Minimal tube coloration, without affecting resolution and definition.

∙ Solid State sound: Balanced across the entire frequency range, musical without tube coloration.

2. Fully Discrete, Fully Symmetric Differential Headphone Amplifier 

The C9ii's headphone amplification circuit is significantly different from that of the first-generation C9. While both amplifiers employ a fully discrete, fully differential four-channel headphone amplification circuit, the C9ii adopts a fully symmetrical circuit architecture. 

2.1 Fully-symmetric Headphone Amplifier

Cayin has designed a three-stage amplification circuit to embrace the fully symmetric design into C9ii: a differential input stage, a voltage amplification stage, and a power driver stage. 

Stage One: Symmetric JFET Common-source Differential input amplifier.

Stage Two: Symmetric BJT Common-emitter Push-Pull Differential Voltage Amplifier. 

Stage Three: Symmetric BJT Common-collector Push-Pull Parallel Current Amplifier(emitter follower).

2.2 Negative FeedBack (NFB) 

The C9ii has an integrated precision control circuit that allows the headphone amplifier to operate in various modes such as NFB/LFB, Class A/Class AB, Hyper, single-ended, and balanced input/output modes.

On the C9ii, when NFB is on (indicator light on), the audio output presents more spatiality with stellar dynamic range, excellent transient response, and relatively fewer harmonics, delivering more neutral sound with impressive detail and speed. Audiophiles frequently associate these changes with “higher resolution.” On the other hand, when NFB is off (indicator light off), the audio output displays richer harmonics. You can hear a more cohesive and full-bodied presentation, with stronger imaging and more textured and elastic mid-bass frequencies. 

Total Sound Shaping Options:

  • Timbre: 3 options (Classic Tube, Modern Tube, Solid-state) 
  • Amplification Mode: 3 options (Class A, Class AB, Hyper) 
  • Anode: 2 options (High, Low) 
  • NFB: 2 options (On/Off) 
  • Input mode: 2 (Line, Pre)

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 94438313512

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Minnie I.
Cuba, US
★★★★★ 4
This is the ONLY paper that works well with SP-1
Style: 100ct
This is the only paper that works well with the Brother SP-1 sublimation printer. The instructions on using the paper are a little weird, but as long as the cut corner remains in the lower right of the printer tray, you'll be okay. I can't say that there's a lot of consistency in printing with this paper. Sometimes photos I've printed for items look really great, other times the photos are quite muted. This is a CMYK printer, which means you won't see the vibrant colors you see on your computer monitor. Often a red-boost in saturation in PS will help with some of that problem. The other issue is there's no real color management profile defined if you're printing directly from Adobe Photoshop and/or Illustrator. Even if you use matching CMYK colors in your artwork, don't expect those colors to work in sublimation. For simple artwork, with few color gradations, this seems to work pretty well. So, if you have an SP-1, this is the only paper you should use.
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JenLynBirdlady
Alexandria, US
★★★★★ 5
My favorite sub paper
Style: 100ct
It works great with my new Brother sublimation printer. I am super happy with the quality of this sub paper.
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Reviewed in the United States on April 9, 2024
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Brooksie
Louisville, US
★★★★★ 5
sublimation paper
Style: 100ct
Good quality. Not sure if the print is the printer or not
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Reviewed in the United States on April 27, 2024
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jennifer Williams
San Leandro, US
★★★★★ 5
Great paper
Style: 100ct
This paper did a great job
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Reviewed in the United States on July 21, 2024
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Fam Of 4
Grantham, US
★★★★★ 5
Amazing product!
Set name: Sublimation Printer, Set name: Sublimation Printer
All I can say is "WOW". I was skeptical about changing over from my Sawgrass to another brand of sublimation printers. But now I wish I started here from the start! Not only does this machine cost a good amount less with the same paper sizes and options as my SG500 but the ink is cheaper per cartridge and 11ml larger than the standard 30ml I am use to. Set up was super easy, as well as the connection. My prints are bold, bright, and beautiful. I am amazed! I am thankful that the details in the prints show through no matter what material I am pressing on. As a business owner, I need a good, efficient printer that doesn't cost more than the product I am selling. I can't wait to continue using my machine. I have not run into any maintenance issue and can not speak on anything of that as of now. Attached photos; however, my camera did not do it justice.
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Reviewed in the United States on January 15, 2026

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