TTVJ Portable (Slim)

General Information

TVJ Portable Headphone Amplifier
• Stepped Attenuator - No cheap volume control pot here. Small potentiometers are notoriously bad - they mis-track, get noisy, and break. So the TTVJ portable uses a microprocessor-controlled analog stepped attenuator. Each of the 32 steps changes the volume level by a precise 2dB, and the gain difference between channels is less than ±0.2dB - compare that to normal pots that at best provide ±3dB! The volume setting is indicated by the color of the front-panel LED. In addition, a switch allows you to select 0dB, 10dB, or 20dB of maximum gain, to accommodate all sources and headphone sensitivities.

• High output power - What's the point of a headphone amp if it can't drive any more than your iPod? The TTVJ portable puts out 3.3V RMS and up to 100mA of output current, so can easily drive any headphones. The regulated power supply guarantees full output power over the life of the battery.

• DC-coupled design - The signal path in most portable amps is AC-coupled, with a single power supply. This requires the audio signal to pass through multiple capacitors, which degrade the sound and limit frequency response. The TTVJ portable has a bipolar power supply, allowing the audio path to be DC-coupled. That means the low-frequency response extends from 0Hz to over 100kHz!

• Long-lasting, rechargeable battery - The TTVJ portable contains a lithium-ion battery which will power the amp for more than 15 hours at typical listening levels. It recharges in about 2 hours from any USB port, or a USB wall charger. You can also operate it while plugged in to keep the battery topped off.


• Frequency response: DC to >100kHz, ±1dB; 20Hz - 20kHz ±0.1dB @ 1V out
• Maximum output: 3.29V RMS into 150Ω; 2.14V RMS into 33Ω
• Output source impedance: Approximately 2Ω
• THD+N: 0.004% @ 1V RMS out into 150Ω or 33Ω
• Broadband noise: <10μV RMS, unweighted, integrated over 20Hz - 20kHz
• Output DC offset: <5mV
• Input impedance: 10kΩ
• Maximum input level: 2V RMS
• Channel tracking (gain difference between channels, all volume steps): <±0.2dB
• Maximum gain: 0dB, 10dB, or 20dB (switch-selectable), ±<0.5dB
• Dimensions: 104mm long x 70mm wide x 12mm thick

THE USB DAC section

The DAC uses a TI (Burr-Brown) PCM2704... TI info is here:

It is a 16-bit DAC, 98dB S/N ratio, 44.1 (or 48) kHz sample rate. Your basic CD-audio-quality USB DAC.

The biggest advantage of using a USB DAC compared to using the audio from a computer is that usually the audio from the computer is very noisy... unless a high-quality sound card is used. Our DAC will solve any noise problems and have you listening to your music in bliss!

Latest reviews

Pros: Great sound
Cons: Gain switch broke after 1st time of use
My favorite portable Amp from my collection, Everything works as has been reviewed and confirmed.
My only complain is for the gain switch which broke easily during my first use!
Well you can't have it all.
Sound wise it rocks and deserves your consideration
Todd is cool, When i informed him he directly offered me two options whichever is better for me , both included departing from my TTVJ slim which I could not, its not a big deal, I asked him to send me the switch and i will fix it later. Be careful when you nit, I am not the only one with this problem, check the forums for gain broke TTVJ slim, and you will know what I mean. At the end it is a great product with excellent support.
You do know that the pyramid with the capstone and the eye in it is the signature of the Illuminati on the back of the 1 dollar bill right? It is the all seeing eye or the eye of Horus which the Illuminati worship! Hahaha just kidding.
Aero Dynamik
Aero Dynamik
Definitely my best sounding and most versatile portable headphone amp. Works perfectly all the way from my FitEar ToGo! 334 (SUPER SENSITIVE!!!) to my Sennheiser HD 650.
Pros: Warm, smooth, expansive soundstage, tube-ish, dead silent,serious slam, crystalline highs, sublime mids, terrific ergonomics, great volume attenuator
Cons: on/off thump, RF interference with iPhone
I was fortunate enough to get on Todd's review list for the TTVJ Portable (Slim), tried it for two weeks with my UE11Pro and AKG 701, and promptly ordered my own unit!!!!!


Cutting to the chase:  oh baby, I LOVE this amp!!!


First let me say that when it comes to serious listening, I am inclined to head straight for my home rig.  My set-up has some serious gear in it -- the speakers alone are mind-blowing -- and frankly I am not expecting to achieve anywhere close to this kind of listening in my portable setup.  How could I?  There are serious physics involved.  So while my expectations are not high for portable audio relative to my home system, I am fussy nonetheless.  Fussy Fussy Fussy.

I want slam, I want clarity, I want accuracy, I want the sound to emerge from complete silence, I want the music to feel live.

And yes, I am also a fan of relative warmth in sound -- I favor honey over ice.  


Not surprisingly, I gravitated to UE11Pros for my portable rig because they are warm, they are bassy, they have some serious slam. For me, they are an attempt to make up for that thin iPod/iPhone sound -- they add some heft to it.  I love them. And while I considered portable amps, and indeed use one fairly regularly as a DAC (Total Bithead) I wasn't convinced there was a portable out there that was worth carrying around.


Until I found it.


The Slim is everything I hoped it would be.  It expands the soundstage of the UE11Pros, helping to mitigate that claustrophobic sound that happens with all IEMs.  It has a warmth like maple sugar on pancakes -- warm enough to run, but thick enough to coat your fork.  It just feels smooth, sometimes even a bit laid back but without feeling recessed or muted.  Bass is powerful and dynamic, highs are clear without ever ever becoming shrill or harsh.  And mids -- oh the mids!!!!  -- if you are a jazzhead this amp belongs in your collection!  Horns, voices -- Annie Lenox sounds like buttah on a sweet potato.  Dee-lish.  (My apologies for the all the food analogies -- I am heading out to dinner soon!).  


With this amp you will forget you are listening to an iPod.  There is nothing digital about the presentation at all.


What's great too is that this presentation is consistent across all sound levels.  You can listen loud or soft and it feels the same -- there is no need to crank this amp to get it to sound good.  And for me, the best thing of all is that there is no hiss.  Zero. Zilch. Nada.  Music emerges from a complete void.  I don't need to explain to fans of Classical music how important that is!  And with the revealing nature of the UE11Pros I really thought it was an impossibility -- but yes, I can confirm, the Slim is Dead Silent.


There is good synergy with the AKG 701 too, but for different reasons.  With the UE11Pro, the Slim tames and tightens the bass, making is less boomy.  With the AKGs,  The Slim tames the high flatness of these headphones; adds some meat to those clinical bones. I'm sure the AKGs would love to be driven with more authority, but they like the Slim just fine.


Ergonomically, the Slim is great.  It is -- yes, -- slim; perfectly matched to the Classic or iPhone.   Despite some marks on the finish of my unit out of the box, I'd say build quality is excellent.  Battery life seems great but I haven't formally tested that, and no I have not had any battery issues.  Gain ranges from zero to twenty and the way the switch is designed there is no way you will accidentally flip it to the wrong setting.  The volume attenuator is simply brilliant -- very precise increments, no way to inadvertently increase the volume, and there is a colored light to indicate how loudly or softly you are setting the amp.  SO helpful!  Thoughtfully, the amp is designed to resume playing at your last volume setting, so there is no way to blow your head off -- unless you intend to, of course.  Very nicely thought out, very well done.  


Sadly, there is still the dreaded on/off "thump."  Why why?  I hate the thump!  But it isn't enough so that your ears will bleed, so I'm ok with that.  And yes there is the dreaded RF interference with the iPhone, making it imperative to use it in airplane mode.


My version does have a DAC and it works fine -- again, no noise or hiss, nice and quiet.  I don't hear as much of a difference between DACs as I expected, but I think these are becoming rather generic at this point.


As for equipment used, I tried the Slim with my Classic, my Nano, and my iPhone, all with an Ear Candy Lite LOD. Musically, my tastes range from classical to trip hop; dance to trance; jazz.  Thoroughly eclectic. 


And finally, at the risk of rendering my entire opinion as that of a tin-eared booby, I could find no difference at all between my brand-new unit and the "burned in" review unit.  None. Zero. Nada. Zilch.   Not that I expected to hear a difference -- I still find it unimaginable to think that these amps need "burn in" -- but if there was a difference, I didn't hear one.  So there!  I've admitted it!

Flame away, but I see no reason to burn this puppy in for 100 hours.  Buy it, and enjoy!


Bottom line?  If you are a clinical, thin analytical ear-splitting-highs-Etymotic-lover, don't buy this amp.  But if you value warm neutrality, spaciousness, musicality, slam, and smoooooooth, just get it over with and buy this thing.  It is one awesome amp. 


I cannot fathom why there is not more press and buzz about this amp.  It deserves a large and loyal following.


It rocks!!!





iPhone 4,3GS,3G,original; plus every version of Ipod 
Ipodded/Hotrodded Silver BMW 335xi, PROUD OWNER OF Ultimate Ears UE11Pro plus my trusty UE5c.TTVJ Portable (Slim) amp; Total Bithead amp, AKG 701 headphones.  Home rig: Krell KAV 300i amp, Krell KAV 300CD player,B&W...

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I spoke to Todd at TTVJ and told him i have a sony mp3 player with sony mdr ex 1000s and im looking for the best possible sound quality for my ex1000s. he said the slim will DO it. i asked him how to hook it up ,he said from my mp3 mic jack to the slim. now with that being said . what is your impression on the sound quality that i will be getting ? hopefully awsom. can wait to recieve it .and later post a review.
Hey all, I'm about to get my TTVJ Slim with DAC in the mail, along with the cable pro cable.. Anything else I would need to hook this up to a macbook? I bought to use with the iPhone, but want to use it for all used on a macbook as well. Thanks in advance for any response.


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