Any good DIY amps for low impedence/high sensitivity headphones? - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 8th May 2012, 04:20 PM   #1
haejuk is offline haejuk  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Northern VA
Default Any good DIY amps for low impedence/high sensitivity headphones?

I am new to DIY and would like to build a desktop amp that will work well with my Denon D2000 headphones. They are low impedance (25 ohm) with 106dB/mW sensitivity. I am looking to build either a solid state amp or a hybrid amp that is suitable to drive them. I have heard that the Starving Student Hybrid is too noisy to work well with these phones.

Basically I want to know which desktop DIY amps have low output impedance, a black background, and are able to deliver a good amount of current into 25 ohms. Also thinking of getting a pair of orthos, if I can find something that delivers enough current that plays nice with my D2ks.

Any suggestions? I am working on an O2, but really want a nice big thing for my desktop for my next project. I am curious about CKKIII, but don't know the specs I am interested in.
  Reply With Quote
Old 8th May 2012, 05:33 PM   #2
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Perhaps a simple TDA2822 can do the job.
__________________
LW1DSE
  Reply With Quote
Old 9th May 2012, 02:59 AM   #3
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
you don't need V gain at all - buffer not amp - consumer Desktop source mostly 2 Vrms, most DAP 1 Vrms 0 db fs

even then a ~12 dB stepdown audio ouptut xfmr would be best to preserve S/N
  Reply With Quote
Old 10th May 2012, 02:09 PM   #4
diyAudio Member
 
Join Date: Jun 2006
Some of this will explain the above post.
  Reply With Quote
Old 10th May 2012, 08:43 PM   #5
haejuk is offline haejuk  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Northern VA
That did explain it quite well. It also makes me want to try to build something similar to what was made in that link, but I don't have the knwoledge to put it together without pcbs, circuit diagram, and BOM. I might be able to just get it done with a circuit diagram, but I think I should get some more experience first.

I will have to check how loud my headphones get when plugged directly into my source (I think it is 1.7v RMS). I am concerned about the prospect of just using an attenuator, and I think this blurb from headphone.com sums it up: "Despite the AH-D2000's seemingly efficient impedance rating of 25 Ohms, it's overall sensitivity and heavy voice coil driver mass will still benefit from dedicated headphone amplification and control to hear exactly what it can sonically accomplish; otherwise, the sound may tend to be lightly 'flat' and un-dynamic, especially from portable audio sources."
I have had less than stellar results by plugging D2000s into my iPhone, namely a poor low frequency response. They get quite loud, but sound disappointing.
  Reply With Quote
Old 10th May 2012, 08:54 PM   #6
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
a buffer provides Current amplication but only unity Voltage gain

for the D2000 Z, sensitivity # you should be able to caclulate SPL: ~120 dB for 1 Vrms drive

iPods and other DAP often have too small a output coupling C which rolls off the lower few octaves - worse with lower Z headphones

if you don't need to reach 120 dB SPL often then even DAP could be used with 25 Ohm load with bass boost EQ to compensate for the RC roll off
  Reply With Quote
Old 11th May 2012, 07:55 AM   #7
diyAudio Member
 
Join Date: Jun 2006
I do BTW have a pair of Fostex T50rp which need 3-4 times more power than the Denons and if I plug them directly to the relatively week line out of my Ibasso D7 they are to loud. You will BTW find measurements of a lot of headphones at Headphone Data Sheet Downloads | InnerFidelity
  Reply With Quote
Old 11th May 2012, 03:11 PM   #8
haejuk is offline haejuk  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Northern VA
Ok, I tried my headphones connected to my 1.7v RMS source, and it was about as loud as I would ever want it. You guys are really good, and I hope one day to be as smart and capable as you all.

burgunder: Is there a kit to make what you linked? That looks like it would be perfect for me, although I would prefer having a power supply rather than 4x 9v batteries. If there is no kit I will have to read through it a few more times and try to come up with some questions about what was used to make it and how I should start.
  Reply With Quote
Old 20th June 2012, 03:08 PM   #9
kawo is offline kawo  China
diyAudio Member
 
Join Date: Mar 2010
Location: Hong Kong
Hi haejuk:
You can try to do the HPA-2 headphone amp. kit, you can find on ebay.
  Reply With Quote
Old 20th June 2012, 08:02 PM   #10
diyAudio Member
 
Join Date: Nov 2011
Location: http://binged.it/ukmr5Y
I'm with @jcx on this one. I recommend you go after a CMOY with unity gain (i.e. a buffer), but configured with <1Z to get all the benefit possible from your 'phones.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
What is better: low or high sensitivity microphones ? Web Wolf Multi-Way 4 7th May 2006 10:35 PM
High Sensitivity, low cost bookshelf speakers? jonnythan Multi-Way 7 1st March 2006 12:50 AM
New to DIY... Looking for something w/ high sensitivity. DonoMan Multi-Way 25 10th February 2005 02:58 AM
High impedance out amps VS as low as possible. Brian Guralnick Solid State 57 31st October 2002 07:47 PM


New To Site? Need Help?

All times are GMT. The time now is 12:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2