AudioAficionado.org  

Go Back   AudioAficionado.org > Manufacturers Forums > Focal Speakers

Focal Speakers The Spirit of Sound

Reply
 
Thread Tools Display Modes
  #1  
Old 04-13-2019, 09:29 PM
sonicmatter's Avatar
sonicmatter sonicmatter is offline
Member
 
Join Date: Jan 2018
Posts: 51
Default Is the Audio research ref75se enough power for the sopra no2?

Hi guys,
I'm using arc ref75se driving sonus faber olympica lll for a year now and noticed that the amp is not efficient enough for the O3's. At high volume the O3's sound strained and harsh. The amp is 75wpc push pull tube class ab and the O3's nominal impedance is 4ohm and sensitivity is 90db claimed but actually is 88.8db measured by hifi news mag. Is this because 4ohm speakers are hard to drive then an 8ohm speakers? Room size is 15' x 15' only.

I'm thinking of changing it to the sopra no2, which is 8ohm and 91db claimed but actually is 88.7db mesured by hifi news mag. My worry is would the arc ref75se have enough power for the sopra no2?
__________________
SF O3, ARC LS28, Ref75SE, RefCD9, DAC9, CA Innovation Compact, Balance +, Shu. Denali 6T.

Last edited by sonicmatter; 04-14-2019 at 03:30 AM.
Reply With Quote
  #2  
Old 04-14-2019, 03:32 AM
sonicmatter's Avatar
sonicmatter sonicmatter is offline
Member
 
Join Date: Jan 2018
Posts: 51
Default

Anybody please help, as I'm going to put a deposit on sopra no2 by tomorrow.
__________________
SF O3, ARC LS28, Ref75SE, RefCD9, DAC9, CA Innovation Compact, Balance +, Shu. Denali 6T.
Reply With Quote
  #3  
Old 04-14-2019, 06:45 AM
tima tima is online now
Living La Vida Vinyl
 
Join Date: Mar 2010
Posts: 1,091
Default

If you have a dealer with the sopra no2, will he let you bring in your ARC 75se to try?
Reply With Quote
  #4  
Old 04-14-2019, 06:49 AM
sonicmatter's Avatar
sonicmatter sonicmatter is offline
Member
 
Join Date: Jan 2018
Posts: 51
Default

Quote:
Originally Posted by tima View Post
If you have a dealer with the sopra no2, will he let you bring in your ARC 75se to try?
The dealer does not have the sopra no2 for demo. They only have no1.
__________________
SF O3, ARC LS28, Ref75SE, RefCD9, DAC9, CA Innovation Compact, Balance +, Shu. Denali 6T.
Reply With Quote
  #5  
Old 04-14-2019, 07:04 AM
tima tima is online now
Living La Vida Vinyl
 
Join Date: Mar 2010
Posts: 1,091
Default

Well ... how close spec-wise is the 2 to the 1? If the 1 is near 90db efficiency and 8 Ohms, the ARC 75se may work fine - it is a sweetheart of an amp. You talk about problems at loud volumes with your other focals - what does that mean. What sort of music do you listen to at loud volumes? I have no familiarity with Focals, just trying to suggest in case you find no one with direct experience? Unless you're willing to change amps, I'd do a bit more research on the combination before ordering.
Reply With Quote
  #6  
Old 04-14-2019, 07:21 AM
sonicmatter's Avatar
sonicmatter sonicmatter is offline
Member
 
Join Date: Jan 2018
Posts: 51
Default

Quote:
Originally Posted by tima View Post
Well ... how close spec-wise is the 2 to the 1? If the 1 is near 90db efficiency and 8 Ohms, the ARC 75se may work fine - it is a sweetheart of an amp. You talk about problems at loud volumes with your other focals - what does that mean. What sort of music do you listen to at loud volumes? I have no familiarity with Focals, just trying to suggest in case you find no one with direct experience? Unless you're willing to change amps, I'd do a bit more research on the combination before ordering.
The speakers im using now are not Focals, it's Sonus Faber Olympica lll.
I listen to all kinds of music like jazz, blues, slow rock, rnb, electronic etc...
__________________
SF O3, ARC LS28, Ref75SE, RefCD9, DAC9, CA Innovation Compact, Balance +, Shu. Denali 6T.
Reply With Quote
  #7  
Old 04-14-2019, 08:33 AM
djcxxx djcxxx is online now
Senior Member
 
Join Date: Jan 2012
Location: Florida
Posts: 107
Default

Your system is very similar to mine and I have no issues with the 75SE running out of steam. In fact the meters rarely deflect to mid point except at unpleasant volumes. Before buying new speakers try to get a loaner on an ARC Ref 150 as means of logically trying to diagnose your concerns of inadequate power. Keep the variables to a minimum to achieve useful, interpretable, results.
__________________
1)Wilson Sasha 1; ARC Ref 5SE; ARC Ref Phono 2SE; ARC Ref CD8; ARC Ref 75SE; Clearaudio Avantgarde Magnum w/ TTS3/DaVinci V.2;Shunyata Denali 6000T
2) SF Amati Homage; McIntosh C70, MC462, MT5 w/ Ortofon Cadenza Blue; Straightwire Crescendo speaker and interconnects; Shunyata Denali 2000T.
Reply With Quote
  #8  
Old 04-14-2019, 10:16 AM
Progfan2112 Progfan2112 is offline
Member
 
Join Date: Oct 2010
Posts: 70
Default

I'm a big Sopra 2 fan but I can't imagine just plopping down $15K on a loudspeaker based on what a stranger tells you on the internet. Demoing a Sopra 1 (a bookshelf speaker) is not going to tell you how a Sopra 2 sounds. If you can't demo a speaker you're interested in, find another dealer who does or wait until they can get one in to demo. Forgetting for a moment the measurements that you're concerned with (impedance/efficiency) the Focals are *very* different in sound to the OIII. Even if they fix the issue you're having at high volumes, that might not matter if you don't like the sound of the speakers. I agree wholeheartedly with tima. Take the time and research before ordering speakers you've never heard. You've lived with the OIII for a year now. What's a little more time going to matter?
__________________
Steve
Reply With Quote
  #9  
Old 04-14-2019, 04:15 PM
jakegt3 jakegt3 is online now
Senior Member
 
Join Date: Mar 2014
Location: Boston, MA
Posts: 104
Default

Not quite apples to apples but I am driving the Sopra No. 3's with a Reference 150 in a medium size room (14'x24'). I would imagine the Reference 75SE would also do well because the power difference isn't that huge, but as others have said, you should do your own audition if at all possible. Also keep in mind that the sense of loudness you get from an amplifier doesn't always correlate 100% with the rated power. My Reference 150 can play significantly "louder" than other amps with similar power.
__________________
John

Main system: ARC Reference 150, ARC Reference 5SE, ARC Reference CD9, Focal Sopra No. 3, Hsu TN1220 (pair) subwoofer + Hsu 500W amp, VPI HW19 Mk 3, Sumiko Blue Point Special, McIntosh MR7084.
Reply With Quote
  #10  
Old 04-14-2019, 06:44 PM
GSOphile GSOphile is online now
Senior Member
 
Join Date: Jul 2017
Location: NC
Posts: 212
Default

The kind of music you listen to will also make a significant difference. The dynamics required by much large orchestral classical music will stress an amp far more the jazz at comparable listening levels.
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump

Audioaficionado.org tested by Norton Internet Security

All times are GMT -4. The time now is 10:09 PM.



Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
ęCopyright 2009-2019 AudioAficionado.org.Privately owned, All Rights Reserved.
Audio Aficionado Sponsors
AudioAficionado Subscriber
AudioAficionado Subscriber
Inspire By Dennis Had
Inspire By Dennis Had
Harmonic Resolution Systems
Harmonic Resolution Systems
Wyred4Sound
Wyred4Sound
Dragonfire Acoustics
Dragonfire Acoustics
GIK Acoustics
GIK Acoustics
Esoteric
Esoteric
AC Infinity
AC Infinity
JL Audio
JL Audio
Acoustic Sciences Corportation
Acoustic Sciences Corportation
Legend Audio & Video
Legend Audio & Video
Audio by E
Audio by E
Canton
Canton
Bryston
Bryston
WireWorld Cables
WireWorld Cables
Stillpoints
Stillpoints
Bricasti Design
Bricasti Design
Furutech
Furutech
Shunyata Research
Shunyata Research
Accuphase
Accuphase