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  How good of a DAC is the Logitech Transporter
I have a Squeeze Box 3 digital out to a Tri-Vista 21. I am considering upgrading to a transporter main reason to get HI-RES native 96/24 FLAC download music which the transporter supports.
My question is the transporter a great sounding stand alone DAC and will I hear a difference between 48/24 through my present up sampled Tri-Vista 21 vs. 96/24 native supported transporter.
Thank you in advance for your feedback.
Audiogalore  (System | Threads | Answers | This Thread)

  Responses (1-70 of 70)
Click title to read one, or click date to read all below it.

06-29-09   Logitech offers a 30 day money back guarantee on the transpo ...   Kgturner

06-29-09   When i tried it, the characteristics of the dac in the trans ...   Shazam

06-29-09   That is just the point and thank you for your opinion, howev ...   Audiogalore

06-29-09   Thank you shazam for your feedback, i also heard that the tr ...   Audiogalore

06-29-09   Hi audiogalore, i have a logitech transporter and it has a ...   Richlane

06-30-09   Hi rick: thank you for that detail reply, imo i have audiop ...   Audiogalore

06-30-09   Hi rick i was just writing on another thread that the squee ...   Jglim

06-30-09   I will definitely say that the transporter should not disapp ...   Richlane

06-30-09   Would appreciate your advice on the settings of the itunes a ...   Jglim

06-30-09   This is a great thread and mirrors kind of where i am at in ...   Richard_stacy

06-30-09   Hi richard, i have people telling me that the weiss minerva ...   Jglim

06-30-09   Jglim...that would be a pricey solution (the weiss dac) and ...   Richard_stacy

06-30-09   From my reading of other people's reviews (no personal exper ...   Jglim

06-30-09   Hi guys, i haven't listened to the squeezebox 3 in my main ...   Richlane

06-30-09   Wow, great post rich! thanks for your efforts and this begin ...   Richard_stacy

06-30-09   I forgot one setting. i also have both the default output a ...   Richlane

06-30-09   You're welcome! if you select the volume control to maximum ...   Richlane

06-30-09   Hi guys: i definitely do not feel hijacked as a matter of f ...   Audiogalore

06-30-09   Hi jglim, quote from jglim: "from my reading of other ...   Richlane

06-30-09   Hi audiogalore, i'm glad i was able to help. you are exact ...   Richlane

06-30-09   Rich, i also take it that you were streaming 96/24 as your t ...   Audiogalore

06-30-09   No i didn't, because the squeezebox can't handle 24bit/96khz ...   Richlane

06-30-09   Okay rich fair analysis, i am curious with the thought, when ...   Audiogalore

06-30-09   Hi audiogalore, i'm not surprised he said that, he's probab ...   Richlane

06-30-09   Rich you are absolutely right not because i am a engineer ce ...   Audiogalore

06-30-09   audiogalore quote: "i guess my dilemma is that i do no ...   Richlane

06-30-09   Thank you for the correction, i some how lost track of mysel ...   Audiogalore

06-30-09   Of metrics that can be measured, the transporter outperforms ...   Wireless200

07-28-09   I own the transporter, a ml390s, a proceed cdp and a weiss m ...   Sugarspice

07-29-09   I have been fact finding all inputs from this thread and hav ...   Audiogalore

07-29-09   Audiogalore, so are you saying that if i want to add a music ...   Sbank

07-29-09   Audiogalore-thanks much for the post. i have been very curio ...   Richard_stacy

07-29-09   Sbank-if your budget allows, i would sell the dac you have a ...   Swampwalker

07-29-09   Sbank: i would not sell your tri -vista 21 at a lost to gain ...   Audiogalore

08-05-09   Audiogalore & swampwalker, thanks for the suggestions. since ...   Sbank

08-06-09   Hi spencer: i had the same setup. sb 3 with a upgraded powe ...   Audiogalore

08-06-09   I use a stock transporter. also have a tact 2.2xp and a emm ...   Wslam

08-13-09   Harold, thanks, that's exactly what i hoped to hear. cheers ...   Sbank

08-13-09   Hi spencer: you are welcome, i think it is only fair that t ...   Audiogalore

08-17-09   gentlemen, i love my transporter. it has taken a bit of wo ...   La45

08-18-09   Hi luis: in regards to the external dac, reading your comme ...   Audiogalore

08-19-09   I have had my transporter for about 3 weeks now. it is repl ...   Ophitoxaemia

08-19-09   Hi ophitoxaemia: the linn genki was a decent sounding $ 200 ...   Audiogalore

04-10-10   The touch has a newer dac, presumably a new digital design. ...   Artmaltman

05-08-10   I have not auditioned a transporter and would very much like ...   Metronet

06-13-10   The touch is fine, but it is no match for the transporter, n ...   Mathguy

06-15-10   I am pretty sure and convinced that the transporter is very ...   Justmember

06-16-10   When the transporter was released, 'miracle' dac chip maker ...   Dotsystem

06-16-10   Thanks for the tip datsystem, yes, i was actually also think ...   Justmember

06-17-10: Aplhifi
(2) i can always purchase another new transport/streamer to go with the Transporter's built-in DAC (via digital inputs?) when higher than 24/96 is supported

Yes, but the wireless transmission in the Transporter is asynchronous so the master clock jitter the AKM DAC see is very low, unlike the S/PDIF input where the master clock comes from the digital receiver and can be 100 times more, at least.

Since I believe AKM DACs are really special (and I use them in all of my products), there is no doubt that the AK4396 DAC in the Transporter is nice (although inferior to the latest 32 bit AKM top-line DACs, IMHO!). Of course, it is all implementation, so "everything matters". And we can't really blame AKM for introducing much better 32 bit DAC solutions after the Transporter was released.

Hope this helps!

Alex Peychev

Aplhifi  (System | Answers | This Thread)

06-17-10   Thanks alex! so are you suggesting that i should use the wi ...   Justmember

06-18-10: Aplhifi
Hi Raymond,

Yes, that is correct; the clock jitter coming from the S/PDIF receiver (all digital inputs) is very high compared to the low jitter clocks used for the wireless.

IMO, this is the major reason why many prefer audio stream from their computer/server against a CD transport. Of course, IMO again, a CD transport can sound better than computer audio, but that is another story. :-)

Alex Peychev

Aplhifi  (System | Answers | This Thread)

06-18-10   Hmmmm, thanks again alex! learning something new every day i ...   Justmember

06-18-10   The low-jitter attribute of wireless also applies to regular ...   Chesebert

06-18-10   Yes chesebert, i was going ask that, i have no problem using ...   Justmember

06-19-10: Aplhifi
Sure, wireless or wired with LAN cable, the clock jitter remains very low. Of course, you can experiment and see if you hear a difference between the two.

Alex Peychev

Aplhifi  (System | Answers | This Thread)

06-19-10   I doubt i would be able to hear the difference though, i mea ...   Justmember

06-20-10   I believe a usb solution would still ultimately involve an s ...   Mathguy

06-20-10: Aplhifi
I've been evaluating the Hiface USB to S/PDIF from M2Tech. With my asynchronous DAC, the Hiface considerably outperforms my Transporter (both upgraded or stock). The Hiface was connected to my Sony VGN-SZxxx Sony Laptop streaming wirelessly audio files from the same server used by the Transporter. Player is Foobar with KS plug-in.

As for the DAC/Analog stage of the Transporter, it is the same as in the AK4396 datasheet recommended circuit for balanced + single ended output (page 35, fig 17). As you can see, there are coupling capacitors at the DAC outputs and NJM5534D Op Amps.

"However, in the case of Transporter there is a very large improvement over the manufacturer's specs because we are using the chip in a far more advanced design than AKM's evaluation board."

I think I'll point AKMs attention to this statement. :-)


Alex Peychev

Aplhifi  (System | Answers | This Thread)

06-20-10   Alex, your hiface/dac outperforms the transporter, maybe bec ...   Justmember

06-21-10: Aplhifi
Raymond, I am evaluating Transporter and Hiface as "digital transports" with my DAC using S/PDIF connection (I am not interested in the Transporter DAC/Analog section). So, I wouldn't say that Hiface is just a convenience and, unlike Transporter, it is 192KHz/24bit capable.

Alex Peychev

Aplhifi  (System | Answers | This Thread)

06-21-10   Alex, i see... i know the transporter is only capable of 24 ...   Justmember

06-22-10: Aplhifi
Raymond, the Transporter is limited to 96K so adding Hiface will not help. Even when used as a digital source to an external DAC, the Transporter still can't do more than 96K. Of course, the newer Slim Servers make possible the playback of audio files with higher resolution, but these are being down-sampled to the 96K limit.

What you can do is experiment with a Hiface plugged to your laptop, feeding the Transporter digital input. In this case you will have 192/24 capability. But as I previously mentioned, the clock quality will be greatly decreased because it will come from the digital input receiver that uses PLL for the clock recovery. In other words, you will not be able to hear the full capabilities of the Hiface.

I will let you know about my findings once I complete the evaluation but, so far, at equal playing fields, I strongly prefer the Hiface. In fact, I like it so much that I will be using M2Tech USB interfaces in my digital products.

Alex Peychev

Aplhifi  (System | Answers | This Thread)

06-22-10   Thanks alex! sorry but i am still confused at one thing. y ...   Justmember

06-23-10: Aplhifi
I am sorry for the confusion, Raymond!

When used as a network player (wi-fi or LAN), the Transporter is limited to 96/24. This is due the processor they are using, I would guess.

When used as a DAC with its digital inputs, the Transporter can do 192/24 because the DIR (Digital Interface Receiver) and the DAC chips (both made by AKM), are capable of this resolution.

Alex Peychev

Aplhifi  (System | Answers | This Thread)

06-23-10   Beautiful! that makes sense, thanks alex! you see, i am just ...   Justmember

07-03-10   Got my transporter last week, have been testing it with my d ...   Justmember

07-14-10   Anyone?   Justmember

07-15-10   You might try gently pulling the control knob 'out' just a b ...   Nwavesailor

07-17-10   Thanks nwavesailor! it seems to improve a bit by doing that, ...   Justmember

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