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Amps for Sonus Faber Stradivari Homage

I have a pair of Stradivaris that I love, but I´m having a little trouble finding the right amps for them. My system consists of: Emmlabs CDSA SE latest version, Clearaudio Champion Level two/ SME V/ Benz Ruby, ARC REF3, MSB 202 monos.
I have driven the speakers with a set of Pass XA 100.5 before, but they sounded compresed quite quickly. The MSB´s offer more power than the 100.5´s and sound more detailed and airy, but also leaner and brighter.
I love detail and air, but I also crawe bass slam and body in the midths and highs. I absolutly hate lean and bright sound, no matter how detailed it might bee.
I have owned quite a lot of Krell gear in the past. I liked the bass of the ols stuf like the KSA s series + the first FPB stuff. The rest of the frequency range however, sounded rough and "solid state" to me. I liked the detail of the MCX 450´s, but they sounded to lean in the low frequences to me. I have tried tube amps as well, but I have not yet found a pair that did´nt sound like tubes in the bass region
So I am dreaming of a set of amps that delivers a full bodied, warm but detailed sound with bass slam and bass detail as well.
Any recomendations ?
NB: English is not my native language, so I hope for your understanding if my spelling is off !
0461
0461 OP
18 posts
 
Hi again,

The quest for new amps pointed me in the direction of McIntoch as allready mentioned. The guy who wanted to sell his 501´s also has a set of almost new 1,2kw, and we are now "negotiating" the price for them. If we can come to an agreement, I would prefer to get them ower the 501´s. Primerly because they are more "top of the line", and I admit to beeing prone to top of the line gear. Also when there is no reason other than the emotional one. It´s like with cars.. I´d rather have the Audi RS6 opposed to the S6 even though I will never really take advantage of the surplus power.... if you know what I mean..
cmalak
681 posts
 
0461...that's great that you have narrowed it down to the MC501 and MC1.2KW but unfortunately they will both not fit that well with your ARC Ref 3. There is a potential impedance mismatch and the place where it will be most apparent is in the bass fequencies, where the Ref 3 has an output impedance above a 1000 ohms. The input impedance of the MC1.2KW is 10Kohms (which gives you less than the minimum 10:1 and certainly less than the often desired 15:1 or 20:1 ratio between the amp's input impedance to the pre's output impedance. The Ref 3's overall output impedance of 600ohms balanced and 300ohms through single-ended connections will barely get you there in terms of the desired ratios but as I said in the important bass region the Ref 3's output impedance goes above 1000ohms. This will cause attenuated and loose bass performance most likely and will therefore muddy up the overall resolution and thicken the sound.

If you look at ARC's power amps (both SS and tube) they are all above 100K ohms in terms of input impedance. So you may have to find a low output impedance preamp to match with your McIntosh SS amps, maybe 1 of their own preamps like the C500T.

Good luck.
0461 OP
18 posts
 
Hi Cmalak,
Thank you very much for your words on impedance. I was not aware of that at all. What a downer.... I am very contend with the Ref3.
But but, "problems with mis-matching impedance in hifi excists to be solved" as my grandma used to say back in 1944 ;-) ( joke ).

Well, we haven´t closed the deal on the 1.2KW´s yet doe to a disagreement on price. The seller seems to be unaffected by my arguments about financial cricis in europe affecting re-sell prices on hifi....

Have a nice weekend all..
cmalak
681 posts
 
0461...the impedance mismatch is on paper, meaning given the nnumbers, it suggests they may not be suitable for each other. The best thing to do is to try to listen to the pairing together. If you have any McIntosh dealers around you, if they do not carry ARC products as well, I would take your Ref 3 to their store and listen to it with a MC501 or MC1.2KW and test them out together. If they sound good, then no problems. I was just making an observation based on the reported numbers.
johnb30
25 posts
 
I have ARC REF3 with MC501 on my Strads. It dosent sounds to good. Ive just ordered a pair of Pass XA160.5
The MC501 just dosent have enough power to drive the Strads. The matching betwen ARC REF3 and MC501 is ok.
Try to look for other amps then Mcintosh. It dosent really sound good with Strads. They deserve a better amp to do justice with them.
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