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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 - Advanced Audio Microphones Canada - Anouar Brahem Tunisia - Phil Caivano/Monster Magnet USA - Capitol Records Hollywood CA ´- Billy Cobham - Coral Sound Inc. NY - Eastside Sound NY - ECM Records Germany - Estudio del Sur Chile - 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 - Institut für Musik und Medien Germany - The Kodak Theatre CA - Kool Savas Germany - KORE Studios United Kingdom - Labomatic France - Luckymusic Switzerland - Madooma Germany - Magnanimous Recording Studio Greece - Mammoth Sound CA - Midilive Studios France - MUSE United Kingdom - Musica Divina Belgium - 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 - Radio Television Suisse RTS Switzerland - realsound.it  Italy - RED BULL Studios - Matthias Reim Germany - Rock Town Netherlands - Robert Schumann Academy Germany - SEEED Germany- State University of New York - Sonic Pump Studios Finland - Sonogramme France - SRG SSR Television Switzerland - Staatstheater Darmstadt Germany - 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 - Wisseloord Studios Netherlands - 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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A beautifully sounding instrument... great work - and again, cordial thanks !
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The M269 sounds significantly more open and balanced than I can remember. Many thanks for your awesome work.
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The reskinned capsule sounds amazing. I can't hear any difference to the original. Great job ! Many cordial thanks !
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Many thanks for your outstanding work ! We are very amazed by our 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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I thank you very much for the absolutely magnificent service. Never experienced anything like this anywhere else !
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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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Thanks for the good service. Our 87 is at its best again !
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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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The Brauner you modified for us is... how shall I say... absolutely dynamite !
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Your power supply arrived a few minutes ago. I plugged in the C24 and it is WONDERFUL. No hum, no RFI, nothing but clean sound. THANK YOU!!!!!
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The mic sounds fantastic! Really happy to have it back and performing well. The power supply is excellent. Of course it is VERY well made! I'm glad I decided to buy it.
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You are helping to keep alive the craft of making great sounding recordings! I bow in the direction of Konstanz !
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I tested the KM254 today, and the sound of an acoustic knocks me off my feet. Thanks for your amazing work !
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Many thanks for the microphone !!! I received it completely safe back and it works like it never worked before :)
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The result is amazing: the definition is at its best and noise has gone completely ! A miracle...
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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 !