Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › beyerdynamic A 20 amp
New Posts  All Forums:Forum Nav:

beyerdynamic A 20 amp - Page 2

post #16 of 37
Quote:
Originally Posted by devhen View Post
 

I'm very interested in this amp, I may buy it soon. Anyone else have any reviews/impressions to give?

 

I'm thinking maybe its swinging a decent amount of voltage despite its relatively low power output? That seems like something that might work well for a lot of Beyer cans...

 

 

Would be interesting to see how it flare wtih your LakePeople amp. Keep us informed.

post #17 of 37
Quote:
Originally Posted by Greeni View Post
 

 

 

Would be interesting to see how it flare wtih your LakePeople amp. Keep us informed.

 

A20 is no match for the V200 amp here, but the A20 does play nice with the T70 and T90

post #18 of 37
Quote:
Originally Posted by Greeni View Post

 

Would be interesting to see how it flare wtih your LakePeople amp. Keep us informed.

 

I'll definitely let you know. I'm still mulling this over but I'm pretty sure I'll be buying the A20. I need a second SS amp so that I've got separate volume control for when multiple people are listening and the A20 sounds like the perfect companion because its kind of the exact opposite of the G109; the G109 is low output impedance with lots of power and the A20 is high output impedance with relatively low power. It would also be nice to have a separate amp for my more sensitive cans so I can have plenty of usable volume range without having to open up the G109 and adjust its gain settings. And I love that the A20 has a parallel output. So far it looks like its exactly what I need unless it turns out to not work well with my mid/low impedance cans like the K712 and DT1350. And of course it doesn't hurt that I'm a big Beyer fan and have several of their cans that I'd love to try with the A20. ;)

 

Quote:
Originally Posted by Ultrainferno View Post

 

A20 is no match for the V200 amp here, but the A20 does play nice with the T70 and T90

 

I'm assuming you're referring to how powerful they are or are you saying the A 20 is sonically inferior?

post #19 of 37
Quote:
Originally Posted by devhen View Post
 

 

I'm assuming you're referring to how powerful they are or are you saying the A 20 is sonically inferior?

 

Yes to both, and the difference is not small

post #20 of 37
Quote:
Originally Posted by Ultrainferno View Post

 

Yes to both, and the difference is not small

 

Interesting. Have you tried the A20 with any lower impedance cans, say around 32 ~ 80 ohm? I'm wondering if the high output impedance will cause issues with those cans.

post #21 of 37

I have tried it with the COP, L2 and the DT770 AE, and even the LCD-2 ;) . With those to me it is just an ok amp, nothing exceptional.

The amp just isn't, and very logically so, up to the level of a 1K amp like the V200 or even V100 (which I sold)

 

To me you can clearly see/hear it was specifically tuned for the T70 and T90 / Beyers, but even for those there is a lot better. However the price/quality ratio for the amp is correct.

 

Beyer will also be releasing a new amp, an improved A1 if I'm not mistaken

post #22 of 37

That's very interesting, I should maybe wait to see what the A1's successor looks like.

 

Thanks, I appreciate it.

post #23 of 37
Quote:
Originally Posted by devhen View Post
 

 

Interesting. Have you tried the A20 with any lower impedance cans, say around 32 ~ 80 ohm? I'm wondering if the high output impedance will cause issues with those cans.

 

I recently tried the A20 with an TH-900 and was not that impressed. While the amp sounds very nice with the T70 or the T1 I tried before the Fostex it seems to be hindered by its high output impedance when driving the low-impedance TH-900.

post #24 of 37
Quote:
Originally Posted by Ultrainferno View Post
 

To me you can clearly see/hear it was specifically tuned for the T70 and T90 / Beyers, but even for those there is a lot better. However the price/quality ratio for the amp is correct.

 

Beyer will also be releasing a new amp, an improved A1 if I'm not mistaken

 

I will jump all over this. Beyer T1 is a difficult phones to drive. And I don't want to get into tubes.

Of course this will be expensive

post #25 of 37

Can anybody help me , why is the Output Impedance so high ? , are they trying to avoid Over-Damping to get the Ideal Step or they just don't know what they are doing ?

I am planning to get the s20 soon as a reference SS and as my Valhalla 2 companion , Thanks ! 

post #26 of 37

I think Beyerdynamic knows quite well that they are doing -- after 90 years developing microphones and headphones ;-)

 

The output impedance of the A20 follows some rather old norm that states 100Ohm as a default. Beyerdynamic is the only manufacturer I know that still respects this norm (DIN-EN 60268-7 resp. IEC 268-7). There is a FAQ going into some detail why this high impedance is chosen: http://europe.beyerdynamic.com/service/faqs.html (the last question on the list).

 

Overall the A20 is a very fine amp for higher impedance headphones but may show problems with damping on low-impedance headphones and maybe problems with the overall frequency response on some multi-ba in-ears. Beyers midrange uses mostly 250Ohm and T1 with 600Ohm and all of them are obviously tuned to a higher output impedance while there are better matching amps for e.g. the Fostex TH900.

 

If you're looking for a reference class SS amp the Beyerdynamic A2 might fit your bill: it has switchable output impdedance (near 0 and 100Ohm)...

post #27 of 37
Quote:
Originally Posted by plakat View Post
 

I think Beyerdynamic knows quite well that they are doing -- after 90 years developing microphones and headphones ;-)

 

The output impedance of the A20 follows some rather old norm that states 100Ohm as a default. Beyerdynamic is the only manufacturer I know that still respects this norm (DIN-EN 60268-7 resp. IEC 268-7). There is a FAQ going into some detail why this high impedance is chosen: http://europe.beyerdynamic.com/service/faqs.html (the last question on the list).

 

Overall the A20 is a very fine amp for higher impedance headphones but may show problems with damping on low-impedance headphones and maybe problems with the overall frequency response on some multi-ba in-ears. Beyers midrange uses mostly 250Ohm and T1 with 600Ohm and all of them are obviously tuned to a higher output impedance while there are better matching amps for e.g. the Fostex TH900.

 

If you're looking for a reference class SS amp the Beyerdynamic A2 might fit your bill: it has switchable output impdedance (near 0 and 100Ohm)...

Okay , good to hear , thanks for the link ! 
 

Also do you know how it does with the DT-600 Ohms ? , I don't have any Teslas at the moment so my primary headphones will be DT880 -600 , DT770 - 250 and the DT150 - 250 , asked this since I am worried it will clip on DT 600s since they are power hungry monsters , Teslas are more sensitive and efficient , thanks ! 


Edited by MrTechAgent - 7/29/14 at 7:55am
post #28 of 37

Both the A2, their flagship amp built for the 600Ohm T1, and the A20 are specified at 100mW @600Ohm, so I don't think there will be any problem driving another 600Ohm Beyer model. I've never gone beyond 10 o'clock on my A2 using the T1...

post #29 of 37
Quote:
Originally Posted by plakat View Post
 

Both the A2, their flagship amp built for the 600Ohm T1, and the A20 are specified at 100mW @600Ohm, so I don't think there will be any problem driving another 600Ohm Beyer model. I've never gone beyond 10 o'clock on my A2 using the T1...

Okay , asked since my Valhalla 2 - 450mW@600 has a hard time driving my 880-600s , there is no headroom and that's a OTL , hope the SS current compensates for the lack of voltage 

post #30 of 37

Thats rather interesting... an OTL amp should be a good match with a 600Ohm headphone, technically at least: tubes have no problem with voltage swing but do not deliver much current, 600Ohm headphones need voltage but not much current.

 

I can of course not guarantee that the A20 will match your expectations regarding max. volume, but I know that it delivers more than enough for my taste. Its always a good idea to demo gear before purchasing, so if you can take your headphones to a shop and try it out I'd recommend that.

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › beyerdynamic A 20 amp