Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login


Options
View
Go to last post Go to first unread
wobbly  
#1 Posted : Saturday, April 11, 2009 4:16:38 PM(UTC)
wobbly

Rank: Member

Groups: Member
Joined: 5/13/2008(UTC)
Posts: 22
Location: Tauranga - New Zealand

Just so I can make an informed descision re upgrading a couple of questions guys.
To replicate my current setup of Buffalo 24 driving Ivy using both ballanced and SE out if I were to go Counterpoint/Ballsie - then.
1 - I would need two Counterpoints to run the ballanced amps and a Ballsie tagged onto the outputs to drive the SE plate amps ?
2 - Ideally I would then need another bipolar supply for the Ballsie or can this be powered off the Counterpoint supply ?
3 - Running this way I have no issues with thumps.?
Russ White  
#2 Posted : Saturday, April 11, 2009 6:26:40 PM(UTC)
Russ White

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN

Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
Hi Wobbly,

1) Yes.
2) I would use just one supply.
3) I can't say for sure, I have not tried it, but I think you probably would not. That said we may have a better option for you soon. Look for something in the next few weeks.
wobbly  
#3 Posted : Saturday, April 11, 2009 6:38:22 PM(UTC)
wobbly

Rank: Member

Groups: Member
Joined: 5/13/2008(UTC)
Posts: 22
Location: Tauranga - New Zealand

Thanks Russ,I cant help but ask - the IVY is a ballanced I/V with SE converters tagged onto the outputs.
If the Counterpoint is technically/aurally superior to the IVY would this not have been the preferred I/V,with a SE stage tagged on the outputs, for the Buffalo 32 - thumps notwithstanding.

But then we have IVY2 as well in the mix - and the question here is - can or will it be possible to convert the original IVY to IVY2 with component changes or is it a vastly different circuit config.
Russ White  
#4 Posted : Saturday, April 11, 2009 6:43:18 PM(UTC)
Russ White

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN

Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
Buffalo32S and IVY II use a novel technique that totally eliminates the "need" for a BAL/SE converter. :) It a completely new beast.

That said, we have a cool little cct that people can use if they want extra SE headroom. But its not released just yet.
Shaman  
#5 Posted : Sunday, April 12, 2009 5:44:01 AM(UTC)
Shaman

Rank: Advanced Member

Groups: Member
Joined: 1/11/2009(UTC)
Posts: 70
Location: Greece

wobbly wrote:
If the Counterpoint is technically/aurally superior to the IVY would this not have been the preferred I/V,with a SE stage tagged on the outputs, for the Buffalo 32 - thumps notwithstanding.


I was wondering the same thing. Angel
Russ White  
#6 Posted : Sunday, April 12, 2009 9:52:43 AM(UTC)
Russ White

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN

Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
I certainly don't think and have never said that Counterpoint is superior to IVY I or IVY II. :)

Also, Take off the feedback caps(C1 and C2) on the original IVY an you will improve it. This is something I only proved to myself lately.

The bottom line is, the OPA1632/THS4131 etc do not like a capacitive load at all, and it quickly makes THD climb.

IVY II does not use any FB caps in the I/V stage, just a passive low order filter.

Cheers!
Russ
Shaman  
#7 Posted : Sunday, April 12, 2009 10:15:54 AM(UTC)
Shaman

Rank: Advanced Member

Groups: Member
Joined: 1/11/2009(UTC)
Posts: 70
Location: Greece

Russ White wrote:
I certainly don't think and have never said that Counterpoint is superior to IVY I or IVY II. :)

Also, Take off the feedback caps(C1 and C2) on the original IVY an you will improve it. This is something I only proved to myself lately.

The bottom line is, the OPA1632/THS4131 etc do not like a capacitive load at all, and it quickly makes THD climb.

IVY II does not use any FB caps in the I/V stage, just a passive low order filter.

Cheers!
Russ


Thanks for the input!
Btw Russ, how does the OPA1632 compare to the LM4562? :)

Edited by user Sunday, April 12, 2009 10:20:41 AM(UTC)  | Reason: Not specified

Rss Feed  Atom Feed
Users browsing this topic
GuestUser (3)
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.