drefahlaudio.com

Maximum audiophile ratings in for SACD of Goldberg Variations performed by Irma Issakadze. Engineered with mics by drefahlaudo.com.

Five Grammy awards for recordings made with mics processed by drefahlaudio.com

"(...) 'Peter does incredible work on all vintage microphones. One of our favourites is a Neumann/Gefell UM57 totally rehabbed and outfitted with his solid-state multipattern power supply,' Holtzman says."

MixOnline on Les Paul's latest, grammy-awarded album (Eastside Sound NYC)

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"The DN221 is beautifully made(..). The Tubelife-257 and the Gefell supplies sounded fabulous, with strong mids and deep lows, but the DN221 was quite different. (...) Transients seemed quicker and fine details were enhanced. "

MusicTech Magazine

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A small selection of artists and studios trusting in our work:

Atlantico Blue Studios Portugal- Anouar Brahem Tunisia - Henrik Cederblom Sweden - Phil Caivano/Monster Magnet USA - Capitol Records Hollywood CA - Coral Sound Inc. NY - Eastside Sound NY - ECM Records Germany - La Fémis France - The Mastering Room Sweden - Galaxy Studios Belgium- Paul Giger Switzerland - Gismo 7 Studios Spain - Hawaii Institute of Marine Biology - Helter Skelter Sweden - Hochschule der Kuenste Bern Switzerland - Idee und Klang Switzerland - The Kodak Theatre CA - Labomatic France - Luckymusic Switzerland - Madooma Germany - Magnanimous Recording Studio Greece - Mammoth Sound CA - Midilive Studios France - MUSE United Kingdom - NoHype Studio Belgium - EMI Sweden - NRK Norwegian Broadcasting Corporation - Officine Meccaniche Italy - Pannonia Studio Budapest Hungary - Paraktio Studio Athens/Grecce - Peermusic Germany - Piano Salon Christophori Berlin - Playground 571 Switzerland - Porgy & Bess Austria - Power Sound Studio Netherlands - Powerplay Studios Switzerland - Prolyd Norway - realsound.it  Italy - Matthias Reim Germany - Rock Town Netherlands - Robert Schumann Academy Germany - SEEED Germany- State University of New York - Sonic Pump Studios Finland - Studio Dealers Paris/France - Studio de la Grande Armée Paris/France - Studio des Aviateurs France - Studio des Forces Motrices Switzerland - Studio Lakanal France - Studio Syrland Iceland - Stephan Sulke Switzerland - Sutton Sound Studios CA - Svenska Grammofon Studion Sweden - TELEFUNKEN USA - Theater und Philharmonie Essen Germany - Tucan Studio Germany - Tuerk Technologies South Africa - Caglar Türkmen Turkey - Universität für Musik und darstellende Kunst Vienna/Austria - University of Texas Dept. of Music TX - Hrolfur Vagnsson Iceland - Viennabackline Austria - Paolo Vinaccia Norway - Voltart Romania - Wavebase AZ - YLE Yleisradio Finland - Zack Studio Switzerland - Zurich School of Music Drama and Dance Switzerland - (t.b.c.)

Some of our clients' appreciated feedbacks:

We will name the mic after you. The 57 is really getting a lot of repeat requests and is satisfying many clients. Great on Chico Freeman's sax on his latest CD. I always let everyone know who brought it to life.
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The PSU definitely gives a huge leap in the sound! Now my U67 sounds more clear, punchy, fat and in detail.  And the case looks totally beautiful and is built like a tank!!
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The mic sounds excellent and is in the condition you described. Great power supply!
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I would like to report that the U67 is working (sounding actually) perfectly after the service you did. Thanks.
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How happy I am with the work you've done on these two mics. They sound fantastic. Thank you !
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What a detailed mic. Blew away our akg's.
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The mic sounds incredibly smooth, especially on the top end. I really love it.
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The power supplies are some of the most beautifully made and beautifully finished pieces of electronic gear that I have ever seen.
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I never heard anything like in my life
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The UM92 has just come back to life! Night and day difference from before we sent it to you.
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Just received and tested the power supply. Perfect ! Our Neumann has no noise at all !
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We are very happy with your work, and I have used the M49 on several live TV broadcasts.
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...never I would imagine that a CMV563 could sound this way. (...) It is now one of the best sounding mics I have ever heard. And I heard a lot of the best sounding "classics" and also new stuff. Biggest compliments.Your work is great and I am really happy with the sound...
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Ein wunderschön klingendes Instrument... grossartige Arbeit - und nochmals herzlichen Dank!
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Das M269 klingt bedeutend offener und ausgewogener als ich in Erinnerung hatte. Vielen Dank für die tolle Arbeit.
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Die reskinnte Kapsel klingt hervorragend. Ich kann keinen Unterschied zum Original feststellen. Tolle Arbeit! Vielen herzlichen Dank!
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Vielen Dank für Ihre tolle Arbeit! Wir sind sehr begeistert von unserem matched U87 pair!
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I received your PSU DN 221 and i used it immediately during a recording in the afternoon. The microphone doesn't lose the warm and typical bass... I am very happy to work with you!
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Ich bedanke mich sehr herzlich für ihren absolut grossartigen (und von mir in der Form bisher noch nie erlebten) Service !
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You made my studio a much happier place !
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Thanx for the excellent business on the power supply.
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The mic (and power supply) is awesome. Thanks once again.
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Thanks doctor !
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My 87 is now close to perfection!
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My U87 sounds lovely by the way. Thanks again!!!
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I luv your work...
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Many thanks for an excellent product & your very efficient service.
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It's wonderful to have one of my favorite mics finally without "tube frying" noises. I really appreciate all of your good work!
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I always use those mics on EVERY session. They have a certain something...
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Danke für den guten Service. Das U87 funktioniert wieder bestens!
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Your support has gone above and beyond any I have experienced anywhere, from any manufacturer or retailer.
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Das von Ihnen modifizierte Brauner ist, wie soll ich sagen, absolutes Dynamit!
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I am so appreciative of your work and help, it is the best on earth! Old world craftsmanship and new world friendliness, what an unbeatable combination.