Have you tried it with the BAM out of the system?I didnt know it would work the way you have it hooked up,good luck,Bob
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I also use the Berning ZH 270 with VSM speakers (MX version). I found that the Berning benefited from the use of a preamplifier. My source is the AA Capitole. The insertion of a preamplifier (Joule or First Sound) in the chain significantly improved the sound. I use the bam between the source and the preamplifier. I was much happier with the Berning (which I really like) after I used it with a preamplifier.
I also have mme's with Berning ZH 270 and second the recommendation of a pre-amp. I have a modest Herron vtsp1 preamp and the system is excellent. I do find on mine, best to keep volume control on Berning not too high (10 o'clock maybe) and crank the pre for volume. Do you still have distortion with BAM out of the system?
Couple other tips, I found that the mme's like to be "dead" level. Also ZH 270 responds well to upgraded power cord. I like JPS AC+. I found noticeably improved dynamics with power cord upgrade.
I'm glad to hear you got the distortion issue resolved Agathe. The Merlin/Berning combo really requires a pre-amp to get the most out of it. I have tried it direct cd out to BAM to Berning. On all settings it was always clear but a bit too lean again, regardless of the feedback settings. As Bobby notes, a tube pre-amp will enable you to tailor the sound to your taste. I have lived with this combo for almost 10 years continuously and I can't overemphasize the importance of system matching to maximize what these two components together can realize. The Berning is so transparent and resolving it is susceptible to vibrations and RFI because of the high frequency used to carry the signal. Tubes also are important to get a desired result. There are plenty of threads on this amp and the Merlin/Berning combo that go into details concerning pretty much all you need to know.