McIntosh 252 or 275 for my B&W 804s?

Thank you all for the input.

So I'll upgrade the amp first. All of you agree with that. This narrows the options, which is very helpful.

Arthur: my room is actually large, 450 sqft. This would suggest the 252, per your comments. What's your opinion about 2 bridged 275? Doubles the power but also doubles the distortion, I'm told. And what about the 252 + a sub? I've been considering a Rel Storm III as well. I understand these integrate pretty well with B&W driven by solid state, but would it be the same if driven by tubes?

In terms of pre I was considering the Tact 2.2XP because of it's room correction capabilities, which are said to be really something. This would allow for tubes + ss pre.

Thanks a lot!

Well,
I just took the plunge about a month ago and picked up a MC 275 V. I first upgraded from all solid state to a Modwright SWL 9.0 tubed linestage and a Mark Levinson 23.5. That was a huge change ... probably the biggest for me. I like the control of the SS amp and the smoothness of the tube front end. It really took the fatigue out of the all solid state system I was running. Again, this is just my experience – I don’t meant to knock anyone in love with their “all solid state setup” … no two systems are the same after all.
I am running much smaller Aerial 6 speakers, so I don’t think it's a 1 to 1 with your 804’s but I thought I would throw in my two cents. I was so very happy with the Modwright/Levinson combo that I purchased a Levinson 360S DAC and a No. 37 transport. I was all ready to call it good when I heard the Mac 275 and Dynaudio Confidence C2's. Lucky for me I am very pleased with my current setup and I'm at a point where I don’t feel like jumping every time I hear a truly spectacular setup. “Somehow they never quite sound that good when you em home” I have my two channel setup in a converted bedroom (12 X 15) - so the speakers don’t need to work real hard to reach a desirable level. The Aerial 6’s are a fantastic little speaker but nothing like the Dynaudio to my ears. One look at the price tag on the C2’s and I could safely pass them off for the distant future but the Mac tube amp was do-able. I really got the itch to try a MC-275 after that demo. It didn’t take long before I pulled the trigger and one arrived at my doorstep.
The Mac tube amp was really quite fantastic – the demo ran for over an hour and I was significantly impressed with what it “could” do. I had purchased a few tube amps over the years and really liked the midrange frequencies in particularly the vocal range so I was hoping for the same magic as the demo. To make a long story short … I wasn’t all that blown away. It didn’t have the same effect as the tube front end and SS amp. I am now looking to try a SS front end and the MC-275 just to see what effect it will have. Just for kicks mind you … My guess is my speakers just don’t fit well with the combo. I imagine the B&W 804’s and certainly the 802’s would benefit greatly from the 275’s smoothness. I guess my system has enough of what I like not to have as much of an effect on me. I will give it a few more weeks and then switch back. I will go back and forth through the summer and probably park the 275 in the fall. I guess ultimately I might go with the Dynaudio’s and two MC-275’s but by then it might be B&W 800’s or Aerial 9’s.
As for advice – I gotta go with the tube linestage first … try the Mac pre with the Rotel amp. I’d just about bet it will reduce some of the fatigue from the all solid state setup. You might just fall in love. I made the mistake of demo-ing the 804’s with a cold solid state setup about four years ago and decided against B&W … I later heard the 800’s with a Levinson amp and thought it was da bomb. I have since heard the 804’s powered with an ARC tube linestage and kicked myself for not picking them up. The difference was astounding. Nothing against your current setup … but I think you will be amazed at what tubes will do for you. I am running an all solid state Rotel HT system out in the living room and I rarely listen to music out there anymore.

With a room that large, you really need more bass IMO. Bass is not to be underestimated in the overall scheme because it does much more for soundstaging and resolution than you might think. It is the foundation on which all else is built - and you know what happens to a house with poor foundations... The biggest upgrade in overall sound quailty you can make today would be to get bigger speakers or a subwoofer. Especially with 804s. I really like those little speakers but to get much bass out of them, you have to really whip 'em hard. The latest 804S is not as bad as the N804 but even still, I think they get overlooked by many because they are rarely used in a room small enough for them. Their bass remains tight and guarded.

Now, having said that, comparing a 252 with 2x275s is very interesting. I personally haven't heard 275s in mono but I have chatted with a couple guys here who use them that way, and I briefly had two 240s in mono (I only have one now).

If you don't mind replacing the big tubes once a year and the little tubes every other year (not very expensive), can handle a lot of heat in your room, and don't run the risk of a child or pet breaking tubes, then a pair of 275s gets my highest recommendation. This arrangement will allow them to handle the low impedences of your speakers much better than a single 275 would and give you lots more power and headroom which your amps, room and speakers need to sound their best.

The MC252 is the more practical choice here because it gives off little heat, is much more compact, has more power, has a larger damping factor, and has a much lower price tag. But if you only really care about the sound, you have to go with 150W of tube power.

However, you can't just go out and buy a pair of 275s and then use a Rotel preamp with them! :) Remember that a stereo is a series chain and so only sounds as good as its weakest link.... I would suggest that you get one 275 and a C220. Down the road a bit, you can add the second 275. Two 275s will sound much better than one. This is one of those rare instances when 1+1 = 4.

This is an EE geek technicality but I don't know why McIntosh has "mono bridged" on their website because this is incorrect. The 275s are actually "mono parallel" which is much better than bridging for modern speakers. The difference is that parallel halves the output impedance whereas bridging doubles it. So you get higher current in parallel and higher voltage in bridge. Power is voltage x current so their ratio can be either for a given power rating and impedence.

Either way, you will get much more bass out of your speakers with these McIntoshes than you've been getting with your Rotel. I am sure of that. But seriously consider a sub at some point, or at least a home demo of one, just to see what you think. You might be surprised at how much you can improve your Rotel simply by adding a sub. It still won't come close to fancy Mcs but it will bring you a whole new level of enjoyment in the meantime.

Arthur

Horseface: when are you planning to try the ss pre with the 275? Would be interested in learning what you thoughts are. I'll try to get to audition the 275 and a ss pre, but would be valuable to know how it sounded to you, in a known setup. BTW, no ofense taken about my setup...I'm aware of it's limitations!

Arthur: Unfortunately I bought my speakers before moving to this place and never thought I would end up with this large a room. And yeah, wasn't intending to run two 275s with the Rotel pre. I did see it as a path down the road. I can kind of follow the EE talk (being an ME). My dealer said bridging these would generate twice as much distortion. Your thoughts? Also, why using these bridged would required replacing the tubes every year?

Thnaks both. Very informative!

What your dealer has in mind is that paralleling them makes each produce twice the power but this is incorrect. It is the two 'together' that makes twice the power.

A single MC275 produces 75W x 2 channels = 150W total. A 275 wired in mono will produce 150W x 1 channel. It is still the same amount of power (just one less speaker) and so distortion and tube usage is theoretically the same too. Assuming the load (speaker) is the same, which obviously it is, so you would just change taps accordingly. If you don't use the right tap, you might get a little less or a little more distortion depending on which way you go, but all in all, isn't much difference as far as the amps (or tubes) are concerned.

Arthur