In Active crossover application, OPA2134 and OPA2604, which is better? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 November 2006, 01:33 PM   #1
diyAudio Member
 
Join Date: Feb 2004
Location: Beijing
Question In Active crossover application, OPA2134 and OPA2604, which is better?

I found that these two ICs had similar parameter, but some difference:

OPA2134: lower noise(8nv, 2604 is 10nv), lower distortion(0.00008%, 2604 is 0.0003%);

OPA2604: high slew rate(25v/us, 2134 is 20V/us), high bandwidth(20M, 2134 is 8M)

In Active Xover, there are input buffer, filter, output with gain changing. Input buffer and filter are all unit gain.

Then, 2134 and 2604, which is better? Or have other ICs be more fitable in this situation?

Thanks in advance!
  Reply With Quote
Old 8th November 2006, 01:37 PM   #2
diyAudio Member
 
darkfenriz's Avatar
 
Join Date: Jun 2004
Location: Warsaw
If you are going Sallen-Key filter, that's not much difference, because all op-amps work as followers. I would choose opa2134, because 2604 is known to have much higher THD in reality than its spcs suggest.
Adam
  Reply With Quote
Old 8th November 2006, 01:44 PM   #3
PierreG is offline PierreG  Canada
diyAudio Member
 
PierreG's Avatar
 
Join Date: Oct 2004
What schematic are you using?
  Reply With Quote
Old 8th November 2006, 01:57 PM   #4
diyAudio Member
 
Join Date: Feb 2004
Location: Beijing
Thanks.

Yes, I use Sallen-key architecture and 4rd L-R filter. Its a two-way system with input buffer and gain ajustable ouput buffer.

I know there is little difference between these two OP, but I want to know which is better.

Actually, 2604 is a little expensive than 2134. If 2134 is better here, I would like select 2134.
  Reply With Quote
Old 8th November 2006, 05:59 PM   #5
ingrast is offline ingrast  Uruguay
diyAudio Member
 
Join Date: Sep 2004
Location: Montevideo
Quote:
Originally posted by visualwang
T....
Actually, 2604 is a little expensive than 2134. If 2134 is better here, I would like select 2134.

May want to check LM4562 ....
0.00003% THD
2.7 nV
20V/uS
55MHz

Just received 3 free samples today.

Rodolfo
  Reply With Quote
Old 8th November 2006, 06:21 PM   #6
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
When we were developing the XVR1, I prototyped the
circuit with 2604's, and it did not sound good. I attributed
it to instability in the op amp when used near unity gain.

  Reply With Quote
Old 8th November 2006, 07:12 PM   #7
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
I 've tried them all at least half a dozen of the so called high end opamps in this circuit, and the OPA4134 was the best sounding, but still not good enough for me for the mids and tops just for the bass, the mids and tops were better when passivly done still. And as Nelson stated when trying different ones be sure they are unity gain stable before getting them.

Cheers George
Attached Images
File Type: jpg 2 way schematic.jpg (31.7 KB, 606 views)
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 8th November 2006, 07:36 PM   #8
mlloyd1 is offline mlloyd1  United States
diyAudio Member
 
mlloyd1's Avatar
 
Join Date: Feb 2001
Location: illinois
i think the opa2604 is (at least designed to be) unity gain stable - no minimum gain requirement, such as the OPA637 has.

i think Nelson was pointing to something else in the design/operation of OPA2604?

mlloyd1
  Reply With Quote
Old 9th November 2006, 02:39 AM   #9
clem_o is offline clem_o  Philippines
diyAudio Member
 
Join Date: Jun 2005
Location: Manila
In a test that I did with my KEF Kube (a low-frequency active equalizer for older KEF loudspeakers) the 2134s sounded more neutral and less strained than the 2604s. The original ICs are NE5532s BTW.

Cheers!
  Reply With Quote
Old 9th November 2006, 03:01 AM   #10
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
OPA2134 and OPA2604
are very close in data.
It is difficult to say which one is better.
I would say it depends on what circuit.

OPA2604 is a little bit faster. +Gain Bandwidth.
OPA2604 is one of the few op-amps having +24 -24 max supply voltage.

OPA2134 is more stable, as it is not too fast for Audio.
OPA2134 is more used and more liked, than almost any other JFET op
( Maybe still TL072 is most used, but it is far from OPA2134 in quality )

-----

OPA2134 is probably the most used DIY Audio op, all categories.
It is has good qualities and very all-round
so almost never any problems, whatever type of circuit or gain.
Has very good current drive capability for being an OP-amp.
Close to a perfect OP for general Audio designs.

Unless you need that high +24V -24V supply
I would say you buy a supply of 10-20 OPA2134.
They can be good to have at home,
whenever you want to setup some circuit.



lineup
__________________
lineup
  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
Ad847,ad797,opa2604,OPA2132,OPA2134 : Sop8 To Dip8 uhcmos Swap Meet 1 3rd December 2008 11:28 AM
DIY active x-over for 2.1 application peter_m Multi-Way 17 16th December 2007 04:22 PM
Is a crossover circuit really needed for this sound reinforcement application tspringer99 Multi-Way 17 24th January 2006 03:35 AM
OPA2134 or OPA2604 JoeBob Solid State 5 7th January 2002 11:20 AM


New To Site? Need Help?

All times are GMT. The time now is 03:40 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