Experience the thick, lush, and vibrant tones of a vacuum tube amplifier in a portable package with the Cayin C9ii Portable Headphone Amplifier.
Featuring Gen5 Nutube Circuits for variable sound experience, Dual Amp Operation for exquisite tone, battery-driven power circuitry for distortion-free playback, and an ultra-precise volume control for an immersive experience.
The C9ii delivers true desktop-class sound on the go, so you can experience high-fidelity sound no matter where you go.
The Cayin C9ii features the latest generation Gen5 Nutube 6P1 Vacuum Tube Circuit, designed to give you a taste of the distinct rich and vivid tone of a tube amplifier.
The Gen5 Nutube 6P1 is compact, energy-efficient, and more robust than traditional vacuum tubes. Your music will sound life-like, energetic, and enjoyable on just about any headphone or IEM.
The Cayin C9ii features two independent NFB loops to give you two vacuum tube sound experiences in a compact device you can take anywhere.
Choose between Modern or Classic and transform your music in ways you never thought possible.
Modern: Modern Tube Amplifier sound. Clean and detailed.
Classic: Classic Tube Amplifier characteristics. Organic sound, with rich, thick tones.
Alternatively, you can opt for a more high-fidelity sound experience by switching to the Solid-State Timbre option. Solid-state lets you experience your music with unmatched clarity and detail without harshness.
The C9ii Portable Headphone Amplifier's sound-shaping capabilities doesn't end with the timbre switch. With the Adjustable Anode Voltage switch, you can mix and match voltage options with the various tube amp timbre options to create the perfect sound for your preferences.
Cayin pulled out all the stops for the C9ii Portable Amplifier, packing it with four discrete differential channels and a multi-stage amplification circuit so you can experience a clean, studio-like sound like never before.
With eight ultra low-noise JFETs, LSDK489 and LSJ689 JFETs, Toshiba BJT (PNP) Transistors, and Nexperia bipolar transistors, the Cayin C9ii is guaranteed to deliver top-of-the-line sound anywhere, anytime.
The Cayin C9ii is in a class of its own in the portable amplifier market. Its dual amplifier circuits let you switch between Class A and Class AB operations, allowing you to tune the amplifier to your listening preferences
.
Switch to Class A amp mode and enjoy a warm, lush sound without distortion. Toggle to Class AB mode and enjoy a more energetic listening session, characterized by a clean sound with tight and powerful bass.
If you want the ultimate soundstage experience, switch to Hyper Mode and enjoy unmatched detail and immersion in your music.
The Cayin C9ii makes finding the perfect sound easy. On top of the Tube Timber, Anode Voltage, and Dual Amp options, the C9ii also features a Negative Feedback Mode which significantly adjusts sound characteristics and response of the amp circuit.
Mix and match various sound shaping features and discover new ways to enjoy your favorite music on the Cayin C9ii.
The humble volume knob is often overlooked in many audiophile-grade DAC/Amps and Amplifiers - not the C9ii.
The C9ii Headphone Amplifier's MUSES72320V ladder-based volume control boasts ultra-precise channel balance, noise, and distortion characteristics, so your music sounds immersive - even at lower listening volumes.
The Cayin C9ii Headphone Amplifier is powered by four Samsung 35E batteries for consistent performance and long battery life.
Batteries are the preferred power source of many high-end portable audio devices. The Cayin C9ii's quad Samsung 35E batteries ensure you enjoy high-resolution sound all day.
The 18650 batteries in the Cayin C9ii are user-replaceable, allowing you to experiment with various brands of 18650 batteries to get your desired sound characteristics. Slide out the tool-free Modular Battery Tray and switch batteries like you would with your TV remote. It's simple and easy!
The C9ii Headphone Amplifier has all the inputs and outputs you need to enjoy music without compromise.
Connect your DAC/Amp, DAP, or Phone through the 4.4mm Balanced or 3.5mm Single-ended inputs and plug in your preferred headphones or IEMs through the 4.4mm Balanced Output or 3.5mm Single-ended Output.
With the Cayin C9ii's incredible Nutube technology and sound-shaping features, you can enjoy an incredible high-resolution sound experience life never before.
GENERAL INFORMATION
Input
3.5mm TRS
4.4mm TRRRS
Output
3.5mm TRS
4.4mm TRRRS
Charging
USB Type-C with Quick Charge 3.0/Power Delivery 2.0 9V-2A
Dimensions
165 x 88.5 x 30mm
Net Weight
650g (+/- 5g)
Timber Circuit (Tube)
KORG Nutube 6P1 x2
Timber Circuit (Solid State)
Toshiba 2SK209 x4
Input Differential Amp
LSK489 + LSJ689 JFET x4
Electronic Volume Control
MUSES72320V x2
Battery
Samsung INR18650-35E (3400mAh) x4
BATTERY INFORMATION
Solid State
Class A: 15 hours (SE), 13.5 hours (Balanced)
Class AB: 17.5 hours (SE), 10.5 hours (Balanced)
Hyper: 14.7 hours (SE), 10.2 hours (Balanced)
Vacuum Tube (Modern)
Class A: 11.5 hours (SE), 8.2 hours (Balanced)
Class AB: 12.5 hours (SE), 9.5 hours (Balanced)
Hyper: 11.2 hours (SE), 9 hours (Balanced)
Charging Time
Standard Charger (5V-2A): 6.5 hours
Quick Charge 3.0/PD2.0 (9V2A): 3.8 hours
HEADPHONE OUTPUT INFORMATION
Power Output
3.5mm SE: 1200W@16 Ohm, 700mW@32 Ohm, 160mW@150 Ohm, 80mW@300 Ohm (High/Low Gain)
4.4mm Balanced: 4100mW@16 Ohm, 2600mW@32 Ohm, 640mW@150 Ohm, 320mW@300 Ohm (High/Low Gain)
Frequency Response
Tube: 20kHz-80kHz (+/-0.5dB)
Solid State: 11kHz-80kHz (+/-0.5dB)
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We get it. Audio gear can be subjective. That's why we offer our industry-leading 365 day return policy. Here's a quick rundown;
We get it. You've got a lot of choice when it comes to online retailers. Here's why we think you should shop with us at HiFiSoundGear.
Amazing customer service. Adam went into great detail with his experience on these IEMs. Would definitely go to him again!
Good communication throughout the process with fast shipping.
It's such a pleasure doing business with Adam and Lauren that I am honestly looking for an excuse to buy more equipment there. I don't really have a good personal audio store anywhere around; and while I am not exactly morally opposed to Amazon or whatever, it's so much nicer dealing with real people and a small business. I cannot even imagine what else I could ask for.
Great work, to communicate every step along the way. Very personal touch. I will visit the office one day to personally thank them. I love the website. I love the product. I love the state where they are located. Awesome awesome awesome!
Everything went really smoothly and I'm enjoying the headset I purchased. It shipped quickly and arrived well packaged. I had a question about my purchase and received a quick response from the seller. I would buy from HiFiSoundGear again.
Unexpected as in very pleasantly surprised at the sound quality coming out of these :)
I took my Mega5-EST and hooked em up wirelessly and don't miss the wire sound AT ALL!! IMO the wireless sound was 98% of the wired sound without the PIA of the wire. Unless you have some amazing source gear, which thanks to Adam at hifisoundgear I do, you would be hard pressed to hear a massive difference. Especially with a phone as your source.
I did A/B noble Fokus Prestige vs Go pod w Mega 5 and gotta say l, there is more balanced sound with the Go pod chain then the Prestige on its own. To be fair the Mega 5 punches WAY above its price... so the 2 are a match made in heaven.
I find the connection very stable as well. I've used my iPhone AAC/SBC as well as with FiiO BT11 to get other than Apple codecs and was pleasantly surprised as well.
The ear hooks are very comfortable. Actually prefer them to the wire hanging over my ear with a tie behind my neck. For some reason that's hard to get used to and pulls as I wear loose shirts. The hooks stay in as I like to move around a bit. Also the weight is better distributed than other wireless IEMs as the components are in the hooks. The prestige, unless I have foam tips, which I'm not a fan of, will pop out of my ears when I move around. These stay stable and I do not have to re-seat the IEMs to get that great bass nearly as often with other wireless IEMs.
Battery level has been all day 10 hrs so far with intermittent breaks and still have 28% left.
The case also is deep enough to fit the Mega w hooks as it charges which is very convenient. Some IEMs may be too big but they fit with a tad bit of room to spare.
Of course having the flexibility to swap out your favorite IEMs as needed is awesome!!
5 stars for the Go pod and more importantly 5 stars to Adam and his team for such amazingly awesome customer service!! You guys ROCK!! Thanks :)
The iFi Audio iDSD Diablo 2 is an absolute masterpiece in the world of portable amps. It delivers an audio experience that redefines what’s possible in a compact, travel-friendly device.
To all the "haters" out there who mention that the 5180mw output is an overstatement and the "balanced" is not a true balanced output... I say whatever... it drives anything I throw at it with aplomb! FostexTH900mk2, ZMF Caldera Open and Closed, ANY IEM my friends and I have tried ...too many to list. If you need more power than this portable titan.... well you may have hearing loss. And it drives all I mentioned without using "beast mode" (they refer to it as Nitro (1 of 3 settings)). If anything, it could use a lower gain option / IEM match for some sensitive IEMs.
The implementation of BT 5.4 (supports all codecs) is a welcomed addition for quality, but in general, the distance it can be from the source is very small for consistency. That is not a Diablo issue, but a BT5.4 issue IMO.
As for the sound quality...simply unparalleled. I have compared this to desktop headphone amps in the same price range and I would put it toe to toe with them. It even ran close to my buddy's Burson Soloist 3x!!! and the Diablo 2 is portable :)
I run it using A&K SP3000T and it oozes warmth and richness in the lows and highs WITHOUT covering/smoothing anything up in the mids, which is my jam.
It is on the heavier side and will still fit in a pocket... barely. built like a brick. At the limit of what I would like to carry but totally worth it! I get about 6 hours of the 8 rated battery with constant listening, no Bluetooth on, hard wired, IEMs / Caldera tested on the battery life.
In conclusion, the iFi Audio iDSD Diablo 2 is nothing short of extraordinary. It’s the ultimate portable amp for those who refuse to compromise on sound quality, power, or versatility. If you’re serious about your audio and want the best experience on the go, the Diablo 2 is the perfect choice.
Shout out to Adam, a massive THANK YOU!!! for your absolutely OVER THE TOP customer service and shopping experience :) :) Seriously, your dedication and attention to detail have been nothing short of exceptional.
With all the online ordering over the years, HifiSoundGear provides the best service I have encountered. It was as though they were good friends. They responded so nicely to all my questions about the product and shipment. As it works out, while I liked the IEM's, I concluded they were not sufficiently different from the ones i had been using. Again, for the process of returning and getting a refund, they could not have been nicer. Buying from them was a first rate experience.
Recently had a great experience with Adam and Laura. I requested a price match for the FiR KR5 and it was such a painless process. Adam and Laura’s communication is top notch! Adam even sent me a personal thank you video. In my experience, this level of service is hard to come by these days. I highly recommend going through HifiSoundgear for your audio needs….I know I will be going forward! Thanks Adam and Laura!
The quality of service, level of help provided, and overall customer satisfaction is beyond anything I have experienced. I cannot say enough good things about the people who belong to this company!
As for the U4S, these are my first foray into 64 Audio but I am SO thankful that I got to experience them! My goodness the soundstage, bass response from the m15 module, and overall quality is just great!
Please, buy from these wonderful people! And if you can swing it, get a set of U4S! You will not regret it!
Only complaint is the cable. For the price, I expected better, but it works well and is just fine.
Thank you HiFi Sound Gear! I look forward to purchasing more from you in the future!
These are the closest TWS gets to pure IEM listening. You get the wide soundstage. They scale quickly. They have that satisfying bass slam often missing in TWS. The layering is just right and resolution is mesmerizing. Oh yes, you get the convenience of taking them on the go and they are truly comfortable. Noble has achieved a superior status in my eyes with the FoKus Prestige. I look forward to listening to them on my walks when I don’t have to take my DAP. Adam is one of the greats in this business. His commitment to customer service is exceptional. You aren’t a customer, but a client. He helped me after losing my first pair and just went above and beyond to ensure that I was shipped a new pair in less than two days. I am completely satisfied and impressed. You will be too. Thank you and looking forward to my future purchases from your establishment.
HifiSoundGear offers exceptional quality products and unparalleled customer service. Their wide selection of high-end audio gear, including in-ear monitors and amplifiers, are praised for delivering outstanding sound clarity, detail, and an immersive listening...
