Stereo Tube Headphone Amp with 24-bit/96kHz USB DAC, Bluetooth, and Preamp Out
    Product # 16154
    $59.99 $99.99 On Sale 40.00% OFF
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    Stereo Tube Headphone Amp with 24-bit/96kHz USB DAC, Bluetooth, and Preamp Out

    Stereo Tube Headphone Amp


    Enjoy the sound, style, and convenience of a headphone amplifier with Bluetooth®, RCA, and USB inputs. This hybrid tube amp combines the warm, soothing sound of a tube preamp with the efficiency and clarity of a solid state headphone amplifier. Connect your computer to the USB input to use the 24-bit/96kHz Digital to Analog Converter (DAC) to stream WAV, AIFF, FLAC, other high-resolution lossless audio files. Stream your digital music to the amp using the built-in Bluetooth 4.0 radio with the superior sound of the Qualcomm® aptX™ audio codec or connect an external audio device, such as a CD player, to the RCA line inputs. Connect a pair of powered speakers or an external amplifier to the preamp outputs to share the high-quality tube sound with your family and friends. Not only does this amp sound great, it looks great, too! The black panels, chrome accents, and the warm glow of the exposed tubes present a minimalist retro look, which will enhance any home or office environment with a hint of old school styling.



     


    Warm & Rich Sound | Simply Attractive | Bluetooth Convenience

    Stereo Tube Headphone Amp


     
    Sound Quality
    Style
    Versatile
    Sound Quality
    Style
    Versatile


    Sound Quality: Life is too short for audio products that don't sound great! We believe that the whole point of listening to music is to hear it as the artist intended. Our engineers and audio experts have spent countless hours listening to and comparing various amplifiers until we were satisfied we had found models that fit our demanding standards.

    Style: The polished piano black case, brushed aluminum face, and the warm glow of the exposed tubes combine to give this amp a sexy appearance that is at once both classic and futuristic.

    Versatile: Enjoy your music the way you want! Use the stereo RCA jacks to connect directly to a CD player or use the Bluetooth® v4.0 radio to connect wirelessly with your phone. Connect your computer to the USB input to enjoy WAV, AIFF, FLAC, and other high-resolution lossless audio files using the built-in 24-bit/96kHz DAC. Add powered speakers or an external amplifier to the preamp outputs to share the high quality tube sound with your family and friends. Add a subwoofer by connecting to the RCA preamp outputs for even more room shaking sound. The Qualcomm® aptX™ audio codec ensures that your wireless streaming sounds as clean and clear as your wired connections.


    Bluetooth audio for grownups. Listen to music like you care about it.


     
    Compact Stereo Hybrid 15−Watt Tube Amp with Bluetooth
     

    Because of its lossy nature, digital music can often lose some of the depth and warmth that gives it life. Wireless streaming adds an additional layer of digital compression, which can further degrade the audio quality. The addition of the tube preamplifier stage adds back some of the warmth and richness, breathing new life into your digital music, while the Qualcomm® aptX™ audio codec ensures clean and clear Bluetooth® streaming. Connect your computer to the USB input to use the 24-bit/96kHz Digital-to-Analog Converter to stream high-resolution lossless audio files, such as WAV, AIFF, and FLAC files.


     
    Power
    THD
    Qualcomm® aptX™
    Frequency Response


    • 500 milliwatts/channel class AB power amplifier
    • Less than 0.1% total harmonic distortion
    • Qualcomm® aptX™ audio codec for clean and clear wireless streaming
    • 20Hz ~ 20kHz frequency response
    • Tube preamplifier stage with solid state power amplifier
    • Bluetooth® v4.0 wireless streaming
    • One stereo analog RCA input
    • One stereo RCA preamp output
    • 5-way binding post speaker connections


     
    Bluetooth®




     
    1 Year Warranty

    Warranty

    Monoprice not only stands behind every product we sell with a 1 year replacement warranty, we offer a 30-day money back guarantee as well! If the product you purchase does not satisfy your needs, send it back for a full refund.



    Quality at a Fair Price

    Quality at a Fair Price

    Monoprice's rugged design and rigid quality control standards deliver high quality products at fair prices.



    Hassle Free Packaging

    Hassle Free Packaging

    Monoprice exists to bring simplicity, fairness, and confidence to technology choices. This product features recyclable packaging that is simple to open, cost effective, with minimal waste, and fully protective as it travels to you.



    Service & Support

    Service & Support

    You're never on your own with Monoprice products! We have a full team of friendly and knowledgeable technicians available to answer your questions, both before and after the sale. Contact our technical support team for questions about our products, troubleshooting, or even suggestions for products to fit your particular needs. Not to be outdone, our friendly and helpful customer service team is here to make your ordering, delivery, and any possible returns a quick and painless operation, from start to finish!





     
    Inputs RCA Line In, USB DAC, Bluetooth®
    Outputs 1/4" TRS Headphone, RCA Preamp Line Out
    Frequency Response 20Hz ~ 30kHz ±2dB
    Total Harmonic Distortion ≤ 0.1% @1000, 1kHz, 300mW
    RMS Power Output 500mW/channel @100Ω
    Input Sensitivity 750mV
    Signal-to-Noise Ratio ≤ 88dB
    Digital-to-Analog Converter (DAC) 24-bit/96kHz
    Bluetooth Version 4.0 with Qualcomm® aptX™ audio codec
    Bluetooth Range Up to 32 feet (10 meters)
    Tube Types 2x 6N2
    Input Voltages 100 ~ 120 VAC, 60 Hz, 200 ~ 230 VAC, 50 Hz
    Fuse Rating F1A/125V
    Dimensions 7.5" x 5.0" x 9.8" (192 x 126 x 248 mm)
    Weight 6.6 lbs. (3.0kg)
     


    Support Files:



    The Bluetooth® word mark and logos are registered trademarks of Bluetooth SIG, Inc.

    Qualcomm® is a trademark of Qualcomm Incorporated, registered in the United States and other countries. aptX™ is a trademark of Qualcomm Technologies International, Ltd., registered in the United States and other countries. Qualcomm® aptX™ is a product of Qualcomm Technologies International, Ltd.


     
    Start typing your question and we'll check if it was already asked and answered. Learn More
    Browse 13 questions Browse 13 questions and 25 answers
    There's definitely an audible buzzing/humming noise introduced when I plug this in compared to a direct line into my computer. Does anyone else have this problem or a fix for this? Ferrite Core and Ground Loop Isolator don't seem to be my answer.
    Christopher L on Jan 6, 2017
    BEST ANSWER: What about for a laptop? my laptop charger and amp power are plugged into the same power cord, but I can still hear it :(
    What is the recommended burn in time on the tubes?
    A shopper on Nov 23, 2016
    BEST ANSWER: The amps will sound great "out of the box". You will notice additional warmth after 10 hours of use. Since these are not power tubes they are running pretty hot all of the time.
    What replacement tubes are recommended for this amp ?
    Daniel N on Nov 28, 2016
    BEST ANSWER: 6ax7 is a good substitute
    is the 6AX7 tube the same as the 6n2 ?
    Daniel N on Nov 28, 2016
    BEST ANSWER: Hello, thank you for your question. While not exactly the same, the 6AX7 tube is the US equivalent to the popular Chinese 6N2 tube. I hope this helps, and of course if you have any more questions feel free to contact us!
    Is it possible to turn bluetooth off?
    Daniel H on May 12, 2017
    BEST ANSWER: yes, just flip the input switch to the USB or RCA (labelled "CD") input...
    Can this unit drive high-impedence headphones like Beyerdynamic DT990s (they have 250 and 600 ohm models)?
    New User U on Sep 10, 2017
    BEST ANSWER: It may be able to drive them, but only you can tell if it will make you happy. At those impedances, available volume will be limited. My AKG's are 60 ohms and they are sufficiently loud. If I were you, I would avoid 600 ohm headphones altogether. Even 250 ohm is borderline.
    Hi, Can I use 12AU7 pre-tube to replace the existing 6N2?
    A shopper on Feb 16, 2017
    BEST ANSWER: Definite no. the 12AU7 has a 12 volt filament, and the 6N2 has a 6.3 volt filament!
    Can this amp's BT pair with more than one device at a time?
    Bruce B on Jul 23, 2017
    is the tubes works when i connect directly with headphones? or tubes are only for preamp output?
    A shopper on Sep 15, 2017
    BEST ANSWER: I'm pretty certain that the signal is going through the tubes in both cases.
    Do you need a driver for the usb to function in win 7?
    A shopper on Sep 11, 2017
    BEST ANSWER: The device detects as a normal USB audio device, I does not need any special drivers.
    I'm looking into buying this amp, but I plan to cut off the included power supply and connect the leads directly to my 2 output linear power supply. This is to eliminate the switching noise of the included power supply. I need to confirm my power supply can handle what this amp needs. Which voltage does this headphone amp run on and how many milliamps/amps does it use? I can adjust the voltage on my power supply and it can handle 2 amps max.
    A shopper on Sep 13, 2017
    BEST ANSWER: I just realized the power supply is built in and won't require my external power supply. I've been looking at budget tube headphone amps that use wall warts and I got used to asking the power specs if they weren't readily available. I'll probably be ordering this unit soon.
    What does this amp supply for heater voltage? I'm wondering if a 12AX7 pair could be subbed with the use of 6N2 to 12AX7 socket adapters.
    A shopper on Jul 4, 2017
    BEST ANSWER: I am currently doing this with the 25W version, so: yes... seems to be working well with repop tung-sol 12AX7 tubes
    I have a bluetooth transmitter (TaoTronics Bluetooth Transmitter and Receiver Digital Optical TOSLINK) that doesn't have any controls for pairing, and this unit doesn't look like it has any way to control pairing. Is there any way to get these two units to connect?
    A shopper on Jul 16, 2017
    3.7 / 5.0
    31 Reviews
    5 Stars
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    Excellent Bluetooth preamp for my primary music system.
    After reading some of the other reviews I was compelled to share my experience with the MP 16154 Tube DAC. First off, I purchased the product exclusively for the Bluetooth aptX preamp line output to my main Pioneer SC-1223 A/V receiver. My Pioneer does not have built in Bluetooth and I wanted to play my extensive CD/flac and Tidal playlists from my smartphone with comparable quality to direct A/V receiver USB flash playback.

    Requirements were:
    1. Bluetooth with aptX: (Yes) - make sure your device supports aptX
    2. Preamp output: (Yes) – connects directly to my A/V receiver
    3. High quality at a fair price: (Yes) – See detail review below
    4. Looks cool on the shelf: (Yes) – Well built, piano back, glowing tubes.

    Before doing any evaluations, I performed 4 separate burn in sessions for about 10 hours each to make sure the preamp tubes were fully burnt in. THIS IS VERY IMPORTANT! The burn in sessions were done with the MP USB input to my laptop playing 16 bit/44.1 kHz flac files. Some reviewers reported hum or interference. I did not get any noise with any of my tests. I have a Furman PST-8D surge/power conditioner strip that I run all of my equipment from and have never experienced any noise/interference issues with this setup.

    Bluetooth Evaluation: (Exceeded expectations)
    Connecting to Bluetooth is very easy. Once you connect for the first time, your device will automatically connect the next time once in range or Bluetooth is turned on for both devices. The connection is whisper quiet with no hum or interference noise. Music quality was very crisp and clear with no hint of background noise even for quiet sections of songs like “Winter Wind” by Run River North. OK, the real test, does Bluetooth sound as good as direct USB connection? For the test I played the same flac files on my phone through MP Bluetooth, on my laptop with MP USB connection and one other test using USB flash drive directly from the A/V receiver. To my pleasure the MP Bluetooth sounded just a good as the MP USB test. I even preferred the MP Bluetooth tube preamp playback better than the A/V receiver direct USB flash drive playback. Warmer and more enjoyable music experience.

    USB input Evaluation: (Met expectation)
    I used the USB option to burn in the unit but will probably not use this input option down the road in my setup. I usually connect my laptop directly to the HDMI input port on my A/V receiver for both video and audio. Although, I did go ahead and evaluate the USB performance. Some reviews noted the USB connection would disconnect. I did not have that problem during the 40 hour burn in sessions except for one time when moving my laptop. The USB cable was pulled a little bit to one side of the laptop port and the MP disconnected. The MP immediately reconnected once I reseated the USB plug in the laptop. I have a feeling the other customers with the disconnect issue were due to the USB cable not getting a good connection. The included free USB cable is not the best. I would spend a few dollars and get a better/longer gold plated cable like MP product #5438 for a more secure connection if you are going to use the USB input extensively. I did not get any noise or interference like some of the other reviewer’s experienced. As for sound quality, The MP tube amp sounded really good with various music flac files with bit rates ranging from 16/44.1 – 24/96 kHz. I preferred the MP USB tube preamp playback sound better than my A/V receiver direct USB flash drive playback. The musical instruments and voices seamed more real and enjoyable.

    Analog/CD input: (Did not test)
    I really do not have any practical use for this in my setup. My turntable already goes through a phono preamp to my A/V receiver and my son hooks up his mixing board once and a while to my A/V receiver. I guess if you have a device that does not have Bluetooth or USB output you could use this input.

    Headphone output Evaluation: (Met expectation)
    I’m not a headphone person at all and only use earbuds when working out at the gym. I went ahead and used a ¼ adapter I had to try out my Polk earbuds with the headphone jack. The headphone output sounded excellent with good bass, mid and high frequency. The output power was more than enough to drive these small little earbuds. Sorry, not able to evaluate more power hungry headphones.

    Pros: Bluetooth aptX, preamp output, well built, looks cool, USB Input, simple setup, easy to use, meets my expectations and needs 100%, Very happy and would purchase again.

    Cons: Power light is way too bright and takes away from the warm glow of the tubes. It’s like a spotlight beaming out at you. I ended up putting a small piece of black electrical tape over the power light. That did the trick and I can now enjoy the full glow of the tubes without wearing sunglasses.
    February 22, 2017
    Purchased
    7 months ago
    Great hybrid tube headphone amp with a terrible usb interface.
    The amp is well assembled and has a great finish to it for it’s price. One thing to note is that the tubes did come installed in contrary to the manual. The box also had no location to hold the tubes in a non installed way, so the manual is not really up to date to the shipped product. Sound quality is very good from the rca input and makes the amp worthwhile for my uses. I originally wanted to use it as a usb dac / amp for the monorpice planar headphones for my gaming desktop. The usb audio interface has 2 major issues, one is background noise. The background noise is a bit of squeal and hiss that are not present using rca input from another dac. The other issue is that the usb will randomly disconnect on a few devices I tried it on, I have also tried a few other usb cables to rule that out. It may be a defect of the usb interface but it a big qc oversight if it is. I will keep it and use it purely as a amp and not an amp dac combo. It has no noise issues, hum, or hiss from the output when using rca and the sound quality is impressive for such a cheap device. They should have not included the usb portion of it and instead dropped $20 off the price. One thing to note is that the tubes only act as a preamp or a buffer and do not actually drive the headphones directly. Thus the tube life is probably really high.
    November 29, 2016
    Purchased
    9 months ago
    Excellent Sound, Great Features, Great Value
    I bought this unit specifically for the preamp-out feature. I'm using it as a preamp for my 1963 McIntosh 240 amp. I was a bit worried initially because I read some reviews saying the device was noisy. I can honestly say the unit I received is absolutely quiet. It was quiet the moment I first plugged it in and remains completely silent after burning it in for over 24 hours.
    This unit replaces another (earlier model 13194) MP Tube amp I was using as a preamp via the headphone jack. This 13194 unit was NOISY! I tried to quiet it down by adding a solid earth ground and rolling all four tubes. Despite my efforts, there remained a high frequency hiss plus a steady low hum.
    I am in love with the sound of this amp. It is very warm and provides a terrific sound stage. I use all three inputs. I have AirPlay from an AirPort Express connected to the CD input and an AudioTechnica USB turntable hooked to the USB input. I occasionally pair my iPhone with the unit's Bluetooth and although it is my least favorite in terms of sound quality, it works as well as any Bluetooth I've ever used.
    The preamp-out feature is terrific for driving my McIntosh and gives me a complete, end-to-end vacuum tube setup. I am completely happy with this amp and would recommend it to anyone.
    January 22, 2017
    Purchased
    8 months ago
    Packaging Needs Work, so does USB Interface
    Alrighty, let's start with the packaging and manual, or lack thereof. After I received my package and checked the manual online, it stated that the tubes were packed separately from the amp itself for safety reasons. This was not the case for my amp, or for other people's amps judging from the previous review. Monoprice should have really followed this bit, because the first amp I received made a good case for why you should pack it separately.

    After taking it out of the box, I noticed that one of the bulbs looked kinda funny. The top was milky white as opposed to silver, and after setting it up and giving it a try, it turned out that the tube was actually cracked and the amp only had one channel of sound as a result. I sent customer support a message to see if I could just get a replacement tube, but Monoprice does not sell replacements or ship them so no dice. I had to send this one back for a replacement.

    Half a week later, the next one arrived. Still had the tubes already inserted, but these ones seem fine at least. The tubes light up during use with two dim lights inside which aren't nearly as distracting as the power light. The left tube only has one light in there for some reason, but it doesn't seem to affect the sound so I don't think much of it other than the innate want of symmetry, but whatever.

    I can say that this got rid of some particularly bad speaker crackle that my old Monoprice USB DAC/AMP could not get rid of. I am happy about this, and the sound seems to be pretty great. I'm not exactly a hardcore audiophile, but it seems to be easier to listen to for longer periods than before. I suppose that's the "warm" sounding characteristic of tube amplifiers. It's also quite a sturdily built piece of equipment since it's all metal and the volume knob is quite smooth.

    Now for the not so good. Like the previous reviewer, I'm having an irritating issue every once in awhile where my computer stops detecting the amplifier for a moment as if it disconnected. My music is then stopped, or even worse, it starts blaring out of my awful built in monitor speakers. Not pleasant. I need to test another USB cable to see whether the issue is with the amplifier itself or the cable.

    In conclusion, it works decently, but you should maybe either look for something a little more reliable from a bigger brand, or perhaps go for the Monoprice 11567 Desktop Headphone Amplifier. It's cheaper, given me less issues and has less that can go wrong with it. It's also doesn't cost about $5-8 every time a bulb burns out. If you give it a chance though, it's a very attractive piece on the desk (although a bit big) and it sounds quite good.
    December 15, 2016
    Awesome little amp!
    I purchased this a couple of weeks ago, and have used it at work ever since. I have had zero, nada, no issues with it so far. The only features I have not tested are the CD input and the pre-amp output, but have no concern at all that they will work perfectly. My unit is dead quiet on both the USB and BT inputs.

    I have tested this amp with my AKG Quincy Jones Q701 Reference Studio Monitors, JBL Everest Elite 700's in wired mode, and my JBL S200a in ear headphones. In every case, it had more than enough power to drive them beyond comfortable listening levels, and again in every case they each sounded awesome.

    My typical listening source is Spotify Premium either on my PC or my phone, and I have a very eclectic musical personality. I have tried this with everything from Rock, to Hip Hop, to electronica, to folk, to jazz, to gospel and worship. In all cases, the sound is warm and full. There is no crosstalk between the channels, and the vocals jump right out at you. The treble is extended and revealing without becoming harsh. The bass is tight and accurate and not boomy. And finally, the mids are slightly forward making vocal tracks really come alive.

    All in all, I think this is excellent, not just for the money but excellent period. I am even thinking about buying at least two more. One to use at my computer at home, and one to use as a BT receiver for my home stereo.
    July 26, 2017
    Purchased
    2 months ago
    Great for the price but very susceptible to EMI
    Out of the box, I didn't find this DAC/Amp to be very impressive. It was lacking at the low end and doesn't seem especially powerful. The former seems to have solved itself after a couple weeks of burn-in, and I've just learned to live with the latter.

    It does have one major fault, though: It picks up noise from EVERYTHING. If my cable modem was anywhere near it, I'd get buzzing and an occasional burst of radio chatter. If the HDMI cable from my monitor got too close, I'd get a high pitched whine whenever the screen was mostly white. If my phone was anywhere near it, I could hear the couple times a minute it was polling towers for data. If you're going to get this thing make sure you have a spot for it with some space around it, otherwise it's going to drive you nuts.
    December 14, 2016
    Purchased
    10 months ago
    "Warmer Sound"
    Seems to change harsh sound from digital sources closer to sound from records.. Really good bluetooth reception..
    April 26, 2017
    Purchased
    5 months ago
    Noisy
    Build quality seems decent. Setup was easy. I'm having an issue with unwanted noise however. It can be quite prominent at times. Interference with nearby electronic devices I believe. For example, when the platters in a nearby external hard drive initialize to play music, I can actually hear them through the headphones. TO be fair, I haven't experimented much with positioning or shielding yet.
    December 19, 2016
    Purchased
    9 months ago
    It's OK
    This us a very capable device, if you don't have any other DAC currently this will do the trick just don't expect it to drive high ohm headphones. The sound is good (no humming noted) through USB, direct or "CD". The Bluetooth is OK, i have never heard any quality Bluetooth audio yet from any device.

    Built well, looks good, sounds pretty good just not loud enough for me.
    January 2, 2017
    Purchased
    9 months ago
    Pretty darn good, but a few flaws
    Well, 1st and foremost, sound quality: really good. This tube preamp does bring out a better midrange than my previous solid state unit did, no doubt about it. Really good sound. Two nitpicks: tremendous difference in level, between the CD and the Bluetooth inputs. CD is much louder, (maybe 8-10 db louder!!!). Can turn volume on my iPad ALL the way up, and it does come even close to the volume of a CD thru the CD input. That's odd. Other gripe- build quality is only so-so- AC power switch works sometimes, others it can't be turned off. Seems to be a mechanical issue. Couple of time, the right channel would just stop working Complete re-boot solved that both times. Hmmmmm. But for $100, nothing else comes anywhere close in sound quality. This preamp does sound verrrry good!
    June 18, 2017
    Purchased
    3 months ago
    Response from Monoprice
    Hello, thank you for your review. If the item is failing on you, we would be happy to set up a warranty replacement. Please contact us at reviews@monoprice.com with your order # and we can look into what options are available to you.
    June 19, 2017
    New User UStaff

    In Stock This item should ship tomorrow (9/25/2017) if ordered within 5 hours 12 minutes
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