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Amp for shure se 425 - Page 2

post #16 of 20
I think that shure 425 needs amplification. Although it is 22ohm iem it si dual balanced armature and as i know it has different impendance according to the frequencies. I use them with little dot mk3 and they sound great compared to how they sound without it. This is bad because I cannot carry tube amp with me!
post #17 of 20
Quote:
Originally Posted by jamca View Post

I think that shure 425 needs amplification. Although it is 22ohm iem it si dual balanced armature and as i know it has different impendance according to the frequencies. I use them with little dot mk3 and they sound great compared to how they sound without it. This is bad because I cannot carry tube amp with me!

 

Um - no.  The SE425 are 22 ohm - meaning an ideal output impedance for correct damping would be around 2 ohm, no more than 3ohm.  They're designed to be used from a low power output source.  They're also extremely sensitive 109 dB SPL/mW - so even an iPhone / iPod / other portable media will drive them with enough volume to burst an eardrum at full power.

 

Because of the high sensitivity, they're liable to hiss with a high output impedance from your source.

 

The LD MKIII is an OTL tube amp - and although the output impedance doesn't appear to be published by LD - it is likely to be around 30-50 ohms.  Not ideal for IEM's full stop.

 

The first thing I noticed with my LD MKIV when I tried them once with my SE535 was very audible hiss, and the frequency was definitely affected.  Not a good pairing.

 

So - no the 425 does not need extra amplification, and doubly no, an OTL amp is probably the worst you could throw at them.

post #18 of 20
Quote:
Originally Posted by Brooko View Post
 

 

Um - no.  The SE425 are 22 ohm - meaning an ideal output impedance for correct damping would be around 2 ohm, no more than 3ohm.  They're designed to be used from a low power output source.  They're also extremely sensitive 109 dB SPL/mW - so even an iPhone / iPod / other portable media will drive them with enough volume to burst an eardrum at full power.

 

Because of the high sensitivity, they're liable to hiss with a high output impedance from your source.

 

The LD MKIII is an OTL tube amp - and although the output impedance doesn't appear to be published by LD - it is likely to be around 30-50 ohms.  Not ideal for IEM's full stop.

 

The first thing I noticed with my LD MKIV when I tried them once with my SE535 was very audible hiss, and the frequency was definitely affected.  Not a good pairing.

 

So - no the 425 does not need extra amplification, and doubly no, an OTL amp is probably the worst you could throw at them.

of course i cannot dissagree with you. i was not aware about the output impendance mkiii. But somehow i like the sound more with the amplifier, i cannot explain it. I read in a thread( not sure which one) that multi balanced armature is difficult to be driven because of the weird impendace behaviour they have, and i though that little dot just can handle this behaviour. But as you mentioned above i must be wrong...

post #19 of 20

Hey jamca - if it works for you - then don't change. All I'm suggesting is that to recommend any OTL for any of the SE Shure range would not be ideal. It will cause issues with hiss, it's likely to have issues with channel imbalance (because of their sensitivity - you'd have to have the volume pot very low), and the output impedance will change the frequency response.

 

If you prefer the changes - then more power to you :)

 

One again though - these are very easy to drive and do not need (nor benefit from IMO) additional amping.

post #20 of 20

I have the weird problem of finding an amp that works at least more or less well with both the Sure 425 and the Beyerdynamic 990 Pros.  The Magni is amazing because it can drive both with ease.  Actually with the Beyers I get a strange electronic feedback sound that is only audible when no music is playing, but that's beside the point.

 

I have noticed (I'm a genius, right?) that surprise, surprise, the 425 iems sound much better with a better DAC.  So now that I've upgraded from the HRT MSII to the HD, the sound is really, really great.  I'm still using the Schiit magni with the DAC, and it sounds fine to my ears.  Of course, I don't have a lot of flexibility with the volume, because I have to turn it up past 8 o'clock to get even channel balance, but usually I have to turn my computer down if I'm listening to compressed music.

 

With 24bit music, I find that I can turn my computer down about 10% and keep the Magni at about 9 o'clock, giving me a really great sound with even highly dynamic symphonic music, and of course with any kind of faster paced small ensemble (jazz, R&B, vocal, or acoustic) music.  The mids are great, so sometimes I prefer these phones to my Beyers, which do of course have the bass impact I sometimes miss whenever I use iems.  

 

I would agree that these phones don't NEED and amp, but if you can get a higher quality DAC than that of an iPhone, iPad, ect, you may need an amp due to the lack of a headphone jack.  In that case, I totally agree that you need as low an output impedance as possible.  The Magni is one of the few amps that has almost null output impedance, but can drive phones up to 600 ohms, if necessary.  It's also quite transparent, so whatever DAC your using, it will probably be reflected in the Magni, which doesn't make the sound better or worse, just louder.

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