The concentra should easily have more than enough power to drive the auditors. I'm almost positive power is not the issue here. I would give the speakers another 300 hours break in and then make a decision.
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What speakers did you have before? I have listened to the SF Auditors. Bass boom is not typical.
Room placement may be an issue. Have you tried to move them further away from walls? Also, make sure that they are not the identical distance from the back wall as they are from the side wall.
Bass boom can be a result of unique room acoustics. You might try some acoustic treatments. Eighth nerve is good: http://www.eighthnerve.com/
(I am not associated in any way with them)
Hi, thanks to everybody's advice...
Well, my last speaker was B&W N805 and I know that my SF auditor has a quite different sound.
I don't expect to hear some speedy response from my Auditors like N805. What i want to hear is more Controlled-bass... ( sorry, I'm not a native English speaker...:) it is hard to explain what i felt in English...)
And that's why i suspect that my concentra does have a weak point in Damping ability...
Is it because of break-in process? if it is...than I'll be very happy because i don't need to spend lots of money to change new gears... since i really love my concentra..:)
I placed my auditor more than 3.5 ft away from the wall and 4ft from the side wall. the distance between speakers is little over than 6ft.
I'll try room tune as well... but Rubinkin, can you explain more about Auditor's placement?
This is my first time to try SF speakers and it is really hard to find information about Auditor's placement.
Moreover, my dealer seems to know little about the Auditor even he did sell it...
and... once again.. Thank you guys very much about every advice..:)
Hope i can learn more about this wonderful speaker.
I wouldn't rule out the possibility of the Rowland and the SF being a mismatch, both are reported to be on the laid back side of the spectrum.
I am quite fond of the Concentra II, having owned one; here is what Rich Maez (of JRDG) responded to me when I asked about the Concentra and the Concentra II:
The CN I and CN II differ completely by power supply. The CN II has a much more powerful (50% more power) supply and therefore has much better control and power into low frequencies. It also has a separate front end supply that allows the unit to dedicate more power to large transients and make the CN II much more dynamic. High frequency distortion was reduced quite a bit with the second generation unit as well, so it has a much more open and extended high frequency response.
That said, it will cost you nothing to give your current setup more time, so I would suggest you do that first; it could take several months for them to settle in.
Dear Brain74: About the best placement of your Auditor my advise is that you ask directly to Sumiko people, they can help you.
Now, you feel that have a bass booming sound, other than room placement, please analyse as follows: the Auditor is a medium efficiency speaker ( 88db ), it has a 4 Ohm nominal impedance ( low one ) that tell us that maybe it go down to near 2 Ohms in some frecuencies ( maybe in the bass ones ), its usuable bass frecuency is around 50 Hz.
All these specs tell us that the Auditors need a high current amplifier with very low output impedance that can put high current below 4 Ohms: your Concentra 1 can't do it, your Auditors needs a better match amplifier, maybe the Concentra 2 or other Rowland model. Again, ask to the Sumiko people: they have to help you.
Btw, don't wait to much in the low bass: 50 Hz are " only " 50 Hz, nothing more.
Regards and enjoy the music.
I second Raul, above. I have enjoyed auditioning Mahler & blues on SF (Amati, Cremona & Strad) -- using hi-current design amps.
Unfortunately, I only listened to these speakers paired with European amps (i.e. expensive), and therefore can only recommend YBA Passion, Goldmund (the mid-level stereo, can't remember the number), and Symphonic Line RG4. The latter made the nicest music to my taste (I auditioned with Mahler & blues, cd source).
Again, this isn;t to say the Rowland is bad in any way...
Minimum Auditors impendance is around 3.1ohms( they were measured by german Stereoplay mag ) and any good amp should be able to drive it. I second Scottsman and Pingpong, both new Jeff Rowland Concerto Int. and Pass X250.5 are very good choices. Pass X150.5 also, specially with X2.5 preamp. If you like tubes ARC VT100MkIII/LS25MkII combo will also work nicelly. Interesting thing is that the most emotional sound I heard from Auditor was with Pathos Logos. Original stands for Auditor are very important to get the best sound out of them. They sounded horrible to me on non-original, too tall stands.