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Schiit Magni 3+ and Heresy Headphone Amp Reviews

chahahc

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According to Schiit's own published measurements, under a 32ohm load @ 175mVrms, the magni heresy produces more higher order distortion products than the magni 3+. Interesting seeing as higher order distortion is more audible than lower order distortion, and distortion increases in audibility the lower the signal levels. Now whether or not this difference is audible is anyone's guess.
magni3plus highgain 32ohm 175mVrms.png
magniheresy highgain 32ohm 175mVrms .png
 

solderdude

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I'm going to buy an head amp just because I want something with output impedance as low as possible in order to replace the headphone output of my old and loved pre Denon PRA-1500, since i measured it with a multimeter and it has an abysmal ~150 ohm... I have only 32 ohm or lower headphones so the synergy is likely horrible and I want to check how much they can change with a correct impedance ratio.
You can use the PRA1500 line outs directly. Hook up the headphones directly to the RCA (needs a converter wire obviously) as the output R is 4.7 Ohm which is good enough for almost any cases.
You can use the HP out and use that as the pre-out.

This way you can listen to what the gain would be in SQ.

When you are handy with a soldering iron you can bypass the output resistors in the headphone path and output resistance becomes the same 4.7 Ohm.
schematic
 
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You can use the PRA1500 line outs directly. Hook up the headphones directly to the RCA (needs a converter wire obviously) as the output R is 4.7 Ohm which is good enough for almost any cases.
You can use the HP out and use that as the pre-out.

This way you can listen to what the gain would be in SQ.

When you are handy with a soldering iron you can bypass the output resistors in the headphone path and output resistance becomes the same 4.7 Ohm.
schematic
Thank you for your advice, I always appreciate alternative and intruguing ideas like this, but there is something I don't understand, maybe I'm missing somthing: on the linked service manual (i already had this from a long time since I'm always curious about how my gear is implemented) RCA pre outs are rated at 10 Ohm, not 4.7, that is low but not as musch as I desire. Unless you refer to tape rec-out, for witch I can't guess impedence but that is obviously not regulated via volpot.

Unfortunately my soldering and circuits reading skills are not much, so I don't trust myself messing around the pcb of a perfectly working device at the risk of making a disaster, it is something I'd like to improve since i always liked diy projects, but the Denon clearly isn't the right practice ground.

Anyway my magni 3+ is on the way and should be delivered tomorrow. Other than the tecnical impedance reason, I need to replace the Denon for practice reasons too. Sadly at the moment I'm low on space and can't use my old hi-fi system, the Denon is used just with the Tone Board as source from my pc and with its full sized 43 cm it's really a waste of space on my desk.
 
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solderdude

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Thank you for your advice, I always appreciate alternative and intruguing ideas like this, but there is something I don't understand, maybe I'm missing somthing: on the linked service manual (i already had this from a long time since I'm always curious about how my gear is implemented) RCA pre outs are rated at 10 Ohm, not 4.7, that is low but not as musch as I desire. Unless you refer to tape rec-out, for witch I can't guess impedence but that is obviously not regulated via volpot..
The schematic clearly shows 4.7 Ohm on the pre-out. Maybe the specs are incorrect or the schematic is incorrect. The schematic clearly shows 4.7 Ohm. Only with certain IEM's this could be a potentially too high value.
Tape out is > 470 Ohm.
 
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The Pre-out clearly shows 4.7 Ohm on the pre-out. Maybe the specs are incorrect or the schematic is incorrect. The schematic clearly shows 4.7 Ohm. Only with certain IEM's this could be a potentially too high value.
Tape out is > 470 Ohm.
Ok, thank you for the effort of going through the schematic, as I said I can't really read it well, very interesting informations, I'll keep them in mind for when i'll put it back at work or in the unfortunate case I don't like the magni 3+ that I just unpacked... It's so tiny and cute <3
 
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Holy SCHIIT, my magni 3+ burnt out after 4 days and very few hours of usage.
Just after I powered it on, still had to wear my headphones and i heared the protection relay clicking a couple of time, then it started clicking tremendously fast for about one second and then smoke started to come from the top holes, with burnt smell. Tuned off immediately, left few minutes pass, tried to power on a couple time and now the relay seems dead and smoke always start going out after few seconds. Obviously, no sound comes from either head out and pre-outs.
Just yesterday I came across these two comments
magni3 + burnt 1
magni 3+ burnt 2
But i didn't give them much thought...
I'm going to contact the seller but I'll have to send it back in england so this will come out to be a very unfavorable experience, i', really disappointed.
 
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odyo

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Holy SCHIIT, my magni 3+ burnt out after 4 days and very few hours of usage.
Just after I powered it on, still had to wear my headphones and i heared the protection relay clicking a couple of time, then it started clicking tremendously fast for about one second and then smoke started to come from the top holes, with burnt smell. Tuned off immediately, left few minutes pass, tried to power on a couple time and now the relay seems dead and smoke always start going out after few seconds. Obviously, no sound comes from either head out and pre-outs.
Just yesterday I came across these two comments
magni3 + burnt 1
magni 3+ burnt 2
But i didn't give them much thought...
I'm going to contact the seller but I'll have to send it back in england so this will come out to be a very unfavorable experience, i', really disappointed.
Damn it really sucks.
 
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I know that faulty items are always possible, what is really annoying is that it had to happen with an item purchased from abroad. Returning costs to England will be not less than 30€ on an item priced at 130€ on which I already paid 20€ for shipping... Really, dealing with these little amps can became a nightmare for non-US customers... Luckily I paid via paypal that offers a returning cost refund service, hope I can benefit from this, then I'll ask the seller for a refund, don't want a replacement unit since on the web it seems that old magni 3 too was prone to similar problems (Amir too had some smoke from it as I remember, even though it didn't broke) and don't want to risk anymore.
Seriously, I'll put back at work my Denon and wait for something good on local Amazon.
 

solderdude

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Check your headphone to see if it is still O.K. When it too is faulty notify Schiit. They stated publicly that they would pay for damages. A clicking relay may be indicative that the headphone may have received DC pulses.
This is why I think amps like this should have DC protection despite the manufacturer claiming it never happens.

The Heresy is MUCH, MUCH, MUCH less likely to let go of the magic smoke. Yet another reason to go for the better Heresy. There is no audible difference anyway.
 

JohnYang1997

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Check your headphone to see if it is still O.K. When it too is faulty notify Schiit. They stated publicly that they would pay for damages. A clicking relay may be indicative that the headphone may have received DC pulses.
This is why I think amps like this should have DC protection despite the manufacturer claiming it never happens.

The Heresy is MUCH, MUCH, MUCH less likely to let go of the magic smoke. Yet another reason to go for the better Heresy. There is no audible difference anyway.
It's also my gut feeling yet I am not sure it's the amplifier section or the power supply section failed. If it's the power supply design that's in the fault then I suspect Heresy is not much safer.
 

solderdude

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I remember pictures showing an amp having a blown the output stage.
The difference in power supply between the 2 amps is that the Magni3+ has (1 Ohm) inrush current limiting resistors in it (which can burn out and create offset) and the Heresy does not.
Otherwise they have the same power supply.

It's a personal choice of course but if I wanted the cheapest Schiit and had to choose between the 3+ and Heresy and not be bothered by looks (color) there would be only one option: the Heresy. It is unfortunate that on a lot of websites, the ones containing the folks with better hearing and more resolving whatnots, keep telling folks the Heresy is 'clinical and cold' and the 3+ is 'more organic' and 'better sounding'.
Those that fall into that trap run the risk of owning a device that contains a lot of magic smoke that is dying to get out.

I think it is a good thing the upcoming L30 DOES have DC protection, showing it can be done with budget amps. It doesn't make the amp that much more expensive at all when one has an output relay in there already.
 
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JohnYang1997

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pictures show the output stage has blown the output stage.
The difference in power supply between the 2 amps is that the Magni3+ has current limiting resistors in it (which can burn out and create offset) and the Heresy does not.
Otherwise they have the same power supply.

It's a personal choice of course but if I wanted the cheapest Schiit and had to choose between the 3+ and Heresy and not be bothered by looks (color) there would be only one option: the Heresy. It is unfortunate that on a lot of websites, the ones containing the folks with better hearing and more resolving whatnots, keep telling folks the Heresy is 'clinical and cold' and the 3+ is 'more organic' and 'better sounding'.
Those that fall into that trap run the risk of owning a device that contains a lot of magic smoke that is dying to get out.

I think it is a good thing the upcoming L30 DOES have DC protection, showing it can be done with budget amps. It doesn't make the amp that much more expensive at all when one has an output relay in there already.
Oh ok. I didn't see the picture.
I guess the issue is a thermal runaway situation.
 

solderdude

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Looked for the picture but couldn't find it. It showed a charred output device. The 1 Ohm resistors in the power supply were not shown.
 

solderdude

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Check your headphone to see if it is still O.K. When it too is faulty notify Schiit. They stated publicly that they would pay for damages. A clicking relay may be indicative that the headphone may have received DC pulses.
This is why I think amps like this should have DC protection despite the manufacturer claiming it never happens.

The Heresy is MUCH, MUCH, MUCH less likely to let go of the magic smoke. Yet another reason to go for the better Heresy. There is no audible difference anyway.
Fortunately the headphone wasn't even plugged in when it happaned since it was just after I switched it on, there was just an 6,3 -> 3,5 adaptor already inserted since i was going to use a pair of IEM.

It's a personal choice of course but if I wanted the cheapest Schiit and had to choose between the 3+ and Heresy and not be bothered by looks (color) there would be only one option: the Heresy. It is unfortunate that on a lot of websites, the ones containing the folks with better hearing and more resolving whatnots, keep telling folks the Heresy is 'clinical and cold' and the 3+ is 'more organic' and 'better sounding'.
Those that fall into that trap run the risk of owning a device that contains a lot of magic smoke that is dying to get out.
As I stated before, I chose the 3+ just because it was the only one available in stock at that moment. I don't expect to hear any significant difference between them and colors doesn't matter at all, so for me either would be equally fine.

I think it is a good thing the upcoming L30 DOES have DC protection, showing it can be done with budget amps. It doesn't make the amp that much more expensive at all when one has an output relay in there already.
Yeah, I'll be waiting for it, hopefully it will be available directly from amazon here in Italy, in the meantime I'll be hearing to my Denon with the "inversion" of outputs you suggested before (headphones on pre-outs, avtive speakers on headphone out) and maybe I'll just be happy with it.
 
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