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Author Topic: Portable headphone amps. Chord Mojo.  (Read 1833 times)

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Offline ts

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Portable headphone amps. Chord Mojo.
« on: January 07, 2021, 11:28:24 AM »
Finally after about two years of trying different headphone amps/dacs for my beloved Sennheiser HD 650’s, I’ve settled on two. The FIIO Mont Blanc and the OPPO HA-2. The OPPO has a built in DAC and the FIiO is just an amp. While the FIiO can crank the cans to amazing levels, I like the sound of the OPPO better with my phone. Make sense as the DAC in the phone is inferior to that of the OPPO. The OPPO does do a great job with my closed backs though.

There is one other Amp/dac that I’ve yet to try. It’s pricey and I hate the form factor but I’m tempted as the reviews with the HD650’s are all good. The Chord Mojo. Anyone here have one I can demo? Of course I’ll cover shipping back and forth.

Thanks.
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Offline Gutbucket

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Re: Portable headphone amps. Chord Mojo.
« Reply #1 on: January 07, 2021, 11:47:21 AM »
I've been curious about the MiniDSP headphone amp, primarily due to the built-in DSP filtering possibilities which provide simple EQ for correcting by ear, in addition to the deeper capabilities of applying correction curves tailored to the specific headphone, a user's personal HRTF or both in combination.  Have you considered or come across any information about it?

https://www.minidsp.com/products/dsp-headphone-amp/ha-dsp

I also use Senns (HD600/650/700)
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Re: Portable headphone amps. Chord Mojo.
« Reply #2 on: January 07, 2021, 12:24:56 PM »
I've been curious about the MiniDSP headphone amp, primarily due to the built-in DSP filtering possibilities which provide simple EQ for correcting by ear, in addition to the deeper capabilities of applying correction curves tailored to the specific headphone, a user's personal HRTF or both in combination.  Have you considered or come across any information about it?

https://www.minidsp.com/products/dsp-headphone-amp/ha-dsp

I also use Senns (HD600/650/700)

I can’t tell if it’s fully functional without the app. I’m an iPhone guy. It looks like all the custom tailored functions are in the android app? I would love the bass and treble control.

I have original 580’s, Drop 58x Jubilees and original 650’s. I like to get them thumping when no ones around.  :headphones:
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Re: Portable headphone amps. Chord Mojo.
« Reply #3 on: January 07, 2021, 03:27:30 PM »
Looks to me that one form or another of their control app works with iOS, as it is mentioned in the manual. [edit- no, will play from iOS but requires Mac for filter setup, see below] Would need to dig deeper in their forum or elsewhere to confirm.

But yeah, unfortunate that there are simple bass and treble knobs on the thing that can be easily adjusted without connection to an external device running an app.  It appears that tone/filtering control without connection to the app is limited to switching between four saved presets stored in the unit.  Those could be setup as simple preset bass/treble settings (and/or more complex filtering setups), so there is some degree of adjustment without connection to the app, if not as much as would be ideal for dialing in the tonal adjustments often needed for various taper recordings.   It would be more like choosing between four settings chosen so as to be applicable in general.
« Last Edit: January 07, 2021, 06:16:11 PM by Gutbucket »
musical volition > vibrations > voltages > numeric values > voltages > vibrations> virtual teleportation time-machine experience
Better recording made easy - >>Improved PAS table<< | Made excellent- >>click here to download the Oddball Microphone Technique illustrated PDF booklet<< (note: This is a 1st draft, now several years old and in need of revision!  Stay tuned)

Offline Gutbucket

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Re: Portable headphone amps. Chord Mojo.
« Reply #4 on: January 07, 2021, 06:13:29 PM »
Reading more deeply.. The primary filter setup and preset saving program is available for both Mac and Windows OS'.  The unit is able to connect to an iOS device as playback source, but the app needed to adjust filtering via a mobile device is Android only.  As a work around you could setup the presets to provide a limited degree of tonal modification on the go when playing material from an iOS source.

Bummer that it does not feature a way to access the bass/treble filtering directly on the unit as that would greatly increase functionality.  If that were the case I'd immediately buy one for use with my recorders, as well as other sources.  In that way complex corrective DSP filtering for specific headphones and/or listeners could be setup and saved to the four presets, and any necessary overall tonal adjustment needed for the material being listened to could be adjusted to  taste as desired while listening.  Wouldn't really need the app unless you also wanted parametric EQ adjustability on the go.
« Last Edit: January 07, 2021, 06:17:24 PM by Gutbucket »
musical volition > vibrations > voltages > numeric values > voltages > vibrations> virtual teleportation time-machine experience
Better recording made easy - >>Improved PAS table<< | Made excellent- >>click here to download the Oddball Microphone Technique illustrated PDF booklet<< (note: This is a 1st draft, now several years old and in need of revision!  Stay tuned)

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Re: Portable headphone amps. Chord Mojo.
« Reply #5 on: January 08, 2021, 08:42:57 AM »
Thanks for digging deep! Looks like they have a no return policy. Unless one of their US dealers will stock it and accept returns, I’ll probably have to pass. Appreciate all your research.
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Re: Portable headphone amps. Chord Mojo.
« Reply #6 on: January 08, 2021, 10:41:09 AM »
Thanks for the motivation to dig a bit.  Let us know which way you end up going.
musical volition > vibrations > voltages > numeric values > voltages > vibrations> virtual teleportation time-machine experience
Better recording made easy - >>Improved PAS table<< | Made excellent- >>click here to download the Oddball Microphone Technique illustrated PDF booklet<< (note: This is a 1st draft, now several years old and in need of revision!  Stay tuned)

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Re: Portable headphone amps. Chord Mojo.
« Reply #7 on: January 09, 2021, 01:29:46 PM »
I really want to demo a Mojo, (for me to demo I have to buy and hope theres a good return policy if I don’t like it) but I’m concerned about this statement I found on Amazon, when asked if the Mojo can properly drive the 650’s:

“The Mojo puts out 70mW into a 300ohm load and the 6xx series really like closer to 200-300 mW.”

That’s a pretty big difference.
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Re: Portable headphone amps. Chord Mojo.
« Reply #9 on: January 10, 2021, 09:48:18 AM »
Thanks for that. I tried to make the best of what I could out of the charts, however it was his test results with the 650’s and his conclusion that meant the most to me.
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Re: Portable headphone amps. Chord Mojo.
« Reply #10 on: January 10, 2021, 01:40:39 PM »
from what i gather from the headphone tests, with the low impedance output it should be able to drive the 650s accurately up to the pint of clipping (the output not the phones), but it will begin to clip at a relatively low current output. the way the distortion curve rises so steeply this should be audible. so it will work but not at high volumes? seems there are lots of headphone amps in that price range that would be a better fit for 650s
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Re: Portable headphone amps. Chord Mojo.
« Reply #11 on: January 11, 2021, 11:54:17 AM »
Finding the right portable for the 650’s is probably hopeless. They need desktops with tubes I guess. The Mojo would have been the last portable for me to try and it’s looking doubtful.

My desktop is a Drop 02 and the Drop Grace DAC. It’s works pretty good on the 650’s but not as good as I would like. Whatever playback software I happen to use I still have to EQ the bass way up. In my old office I used a Grace M902>650’s and depending on the tunes it was hit or miss. If I ever find myself with an extra $900, it’s going to be a Bottlehead Crack with the speedball upgrade.  :headphones:
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Re: Portable headphone amps. Chord Mojo.
« Reply #12 on: January 13, 2021, 11:52:59 AM »
I really want to demo a Mojo, (for me to demo I have to buy and hope theres a good return policy if I don’t like it) but I’m concerned about this statement I found on Amazon, when asked if the Mojo can properly drive the 650’s:

“The Mojo puts out 70mW into a 300ohm load and the 6xx series really like closer to 200-300 mW.”

That’s a pretty big difference.

Usually don’t make a habit of quoting myself, but I think I’m getting closer to understanding the power requirements for the 650’s.

Based on the above statement I should be looking for say 250 mW into 300ohms. My FIIO E12 can do 880 mW into 32ohms, but I can’t find a rating for 300ohms on this amp. My OPPO HA-2 is rated at a mere 30mW into 300ohms. No wonder I can turn the volume all the way up and still not feel the potential of the 650’s.

There must be a formula to convert. As in if the FIIO is doing 880 at 32, what’s it doing at 300ohms? Not all amps are listing mW ratings at 300 ohms. If I can convert what they do list maybe I’ll have a better shot at finding the right portable for these power hungry cans. :headphones:

Thanks!
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Re: Portable headphone amps. Chord Mojo.
« Reply #13 on: January 13, 2021, 02:55:26 PM »
My audio math is weak but I suspect the answer can be found or determined by the info in this blog post- https://nwavguy.blogspot.com/search?q=more+power+

..that link found in this discussion- https://www.audiosciencereview.com/forum/index.php?threads/headphone-amplifiers-and-high-impedance-headphones.18460/



musical volition > vibrations > voltages > numeric values > voltages > vibrations> virtual teleportation time-machine experience
Better recording made easy - >>Improved PAS table<< | Made excellent- >>click here to download the Oddball Microphone Technique illustrated PDF booklet<< (note: This is a 1st draft, now several years old and in need of revision!  Stay tuned)

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Re: Portable headphone amps. Chord Mojo.
« Reply #14 on: January 13, 2021, 04:47:58 PM »
👍
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