Things are heating up at the Inid household! Glad Gary is feeling better. It is not fair Joe. One should not be allowed to experience heaven yet on this earth.
+1 for Gary feeling better.
Thanks Jim,
Your turn will come
Burmester 911 mk3
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+1 for Gary feeling better.
Thanks Jim,
Your turn will come
garylkoh
WBF Technical Expert (Speakers & Audio Equipment)
Thanks, Micro.
I don't know if you would really need the Interocitor. The REF40 is pretty capable of driving 6m of balanced interconnect. Since the 911 is a balanced amplifier, I always prefer it using balanced inputs. Why would you want to use an RCA cable at the Burmester side?
If you absolutely have to do it, it is always better to use a long XLR and a short RCA.
garylkoh
WBF Technical Expert (Speakers & Audio Equipment)
+1 for Gary feeling better.
Thanks Jim,
Your turn will come
You will experience heaven very soon
Gary,
The only data I cab get about the input impedance of the 911 mk3 says: Burmester 911mk3 input impedance: 22.9kOhms Unbalanced, 1.88kOhms Balanced.
The XLR is surely not a good match for a tube preamplfier and I have found that the REF40 sounds (and measures) better in XLR than RCA.
garylkoh
WBF Technical Expert (Speakers & Audio Equipment)
Documentation on the web about Burmester - even Owner's Manuals - are notoriously bad.... A recent example was one posted on this forum - that the 909 is 120W.
I would be surprised if the XLR input impedance balanced is really that low. I've driven the 911 with 7m XLR cables with absolutely no problems. What is the output impedance on the REF40?
-----How come you guys are talking so much about heaven here in this thread? :b
LG Life's Good!
LG Life's Good!
-----How come you guys are talking so much about heaven here in this thread? :b
LG Life's Good!
Because it's a Burmester thread, duh!
Ha!
The output impedance of the REF40 is 600 ohms. But the main question is that at loads lower than 20 kOhm the distortion starts to rise and there are 10 uF capacitors in serial with each output phase.
If I could get my hands on a 911 mk3 I would immediately measure the input impedance!
Congratulations! IMHO, one of the signs of a truly great system is the ability to listen at low levels with all the joy and excitement of listening louder. Give the amps plenty of time to run in - I find that the 911's (and the 909's) improve slowly, and then there is a giant step up at about the 1,000 hour mark (YMMV depending on your music and listening level). With an industrial facility, I can run them loud at nights without any complaints
Gary, glad to know that you are well now. One of the risks of this hobby is back injury due carrying all these heavy amps around. Just be more careful in future. I've had my fair share of back problems due to moving amps around.
On another note, I've read that running amps in mono mode doubles the wattage but halves the current delivery. Is it true? If that is so, wouldn't biamping be better (vertically or horizontally)?
The audiophile best friend: I have now built more than one dozen of them with different sizes! Surely they do not sound good, but my back thanks ...
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Having used the 911 as a reference amplifier now for over three years with about 100 different pairs of speakers, I can't say I agree with the silver cable choice. As always, I'd suggest a demo in your speakers with your system, but I prefer Cardas Clear or Shunyata cable to the silver cables. For what this stuff costs, make sure and get a demo to see if it's to your liking.
I've found the 911 to be relatively forgiving of different cable compared to a few other things I've tried, that's one of the reasons I like the amplifier so much.
Thanks Jeff,
I should have have my amps Tuesday night
Great news, Joe. Be prepared for sleepless nights!
That doesn't really make sense. The size of the power supply is not changing. You're pretty much taking a 350 watt per channel stereo amplifier
and converting it to a 700 watt single channel amplifier. That should not cut the current delivery in half.
hi Martin,
i read this as well somewhere and it sounds counter-intuitive. though, i a told that in mono mode the amp does see the speaker load at half the rated impedence so its obviously has to be working harder. in fact, i had long discussions with Fabian at Burmester on various configurations to hook up the 911s and he did mention that (in his opinon) the vertical biamping mode is perhaps the best. since i am not a technical guy, i am unable to add more color to this.
in any case, i shud be getting my 2nd 911 in the next couple of weeks (its been shipped from Berlin as i understand) and i will be running it vertically biamped. so keeping my fingers crossed.......
cheers
sujay
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