New Posts New Posts RSS Feed - calling all ath-ad900 owners!!!!!
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Welcome to the Graham Slee Audio Products Owners Forum

 

Open to all owners plus those contemplating the purchase of a Graham Slee HiFi System Components audio product and wishing to use this forum's loaner program: join here (Rules on posting can be found here)

This website along with trade marks Graham Slee and HiFi System Components are owned by Cadman Enterprises Ltd

calling all ath-ad900 owners!!!!!
 Post Reply Post Reply Page  <123>
Author
  Topic Search Topic Search  Topic Options Topic Options
oldson View Drop Down
Senior Member
Senior Member


Joined: 08 Mar 2008
Location: andover, uk
Status: Offline
Points: 174 		Post Options Post Options   Thanks (0) Thanks(0)   Quote oldson Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2009 at 10:05pm
Originally posted by Graham Slee Graham Slee wrote:

Not a lot of people know this but in some conditions headphone amps can go unstable: if you're unlucky enough to drop on the "wrong" impedance combined with the "wrong" cable capacitance and a headphone amp that runs out of a little-understood thing called "phase-margin", then you get another little-understood thing called "ringing", or even worse: "high frequency instability" otherwise known as oscillation.

With headphone impedances ranging from 16 Ohms to 600 Ohms (in the real world) and cable capactances ranging from 250pF to 1,000pF, it's very hard for any headphone amp to perform at its best, and with some combinations its phase-margin just gets too small.

The resulting instability causes brightness, or bass loss.

It is quite possible that the 40 Ohm ATH A900 was not a good match for the amps the reviewers used. I have never found the A900 bass shy. The A700 maybe, but not the A900.

As John and crew here will tell you, I spent a considerable amount of time testing the phase-margin on the SRG in all sorts of impedance combinations, using the SRG's new dual negative feedback network. Each manufacturer uses (hopefully) some form of stabilisation. However, it has been noted elsewhere that some amps favour one end of the impedance spectrum or the other, which basically means at one end they're stable, and the other end they are not.
Graham
having just read your posts again , i notice you are refering to the closed a900.
i already have these but want an open can aswell, i was talking about the ad900.(as an alternative to the hd650, that is)
Back to Top
mrarroyo View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 28 Jul 2008
Location: Miami Beach, FL
Status: Offline
Points: 1401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mrarroyo Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2009 at 10:51pm
Now I am concerned, I do not care for the HD580/600/650 sound. Will the DT250 sound similar
Miguel
Back to Top
oldson View Drop Down
Senior Member
Senior Member


Joined: 08 Mar 2008
Location: andover, uk
Status: Offline
Points: 174 		Post Options Post Options   Thanks (0) Thanks(0)   Quote oldson Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2009 at 11:16pm
Originally posted by mrarroyo mrarroyo wrote:

Now I am concerned, I do not care for the HD580/600/650 sound. Will the DT250 sound similar
Hi Miguel
why exactly do you not like the senns?
i am thinking of the ad900 as an alternative to the hd650. i am hoping to compare these at a local (ish) store soon. trouble is i am liking what i read about the ath-ad2000 now.
unfortunately i have no chance of trying these, as they are import only, in the uk!
its a big gamble but , if i prefer ad900 over hd650,when i try them,i will be thinking the ad2000 should be better with similar charateristics! does that make any senseConfused
cheers
Back to Top
jamescodway View Drop Down
Senior Member
Senior Member
Avatar

Joined: 17 May 2008
Location: Wembley, UK
Status: Offline
Points: 320 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jamescodway Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2009 at 11:19pm
Miguel, I wish I could let you hear my pair... a trip to FL would be great

To my ears, they are a lot more "honest" than HD650... definitely decent top and bottom end extension (which is why some people say the bass sounds 'funny'!!) and not veiled (!!) but they still have the Senn sound to me (which I like, mostly).

HD250 sounds nothing like your preferred K701/RS-1, nor DT770. To me they're more HD25 than 650...

Problem is re-sale might be difficult if it doesn't float your boat...

Let me know if you're ever in London town...
Back to Top
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Retired

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Offline
Points: 16314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2009 at 12:39am
Originally posted by oldson oldson wrote:

Graham
having just read your posts again , i notice you are refering to the closed a900.
i already have these but want an open can aswell, i was talking about the ad900.(as an alternative to the hd650, that is)


Drat! Must get some new specs! Embarrassed
That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
Back to Top
mrarroyo View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 28 Jul 2008
Location: Miami Beach, FL
Status: Offline
Points: 1401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mrarroyo Quote  Post ReplyReply Direct Link To This Post Posted: 07 Jan 2009 at 1:30am
Originally posted by oldson oldson wrote:

Originally posted by mrarroyo mrarroyo wrote:

Now I am concerned, I do not care for the HD580/600/650 sound. Will the DT250 sound similar
Hi Miguel
why exactly do you not like the senns?
i am thinking of the ad900 as an alternative to the hd650. i am hoping to compare these at a local (ish) store soon. trouble is i am liking what i read about the ath-ad2000 now.
unfortunately i have no chance of trying these, as they are import only, in the uk!
its a big gamble but , if i prefer ad900 over hd650,when i try them,i will be thinking the ad2000 should be better with similar charateristics! does that make any senseConfused
cheers
 
To me the HD580/600/650 sound boring and veiled. The upper frequencies are subdue thus why I do not care for it. To me the ATH-W1000, AH-D2000/5000 sound way better but that is me. Others will disagree ... Big%20smile
Miguel
Back to Top
mrarroyo View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 28 Jul 2008
Location: Miami Beach, FL
Status: Offline
Points: 1401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mrarroyo Quote  Post ReplyReply Direct Link To This Post Posted: 07 Jan 2009 at 1:32am
I would love to visit GB, straight to a pub and a few pints (stout) I say! Ooops! I forgot I would be traveling with "she who must be obeyed", which means shopping. Cry
Miguel
Back to Top
 Post Reply Post Reply Page  <123>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.070 seconds.