Analogue revived !

Hornfest 2010

As always, Ed Schillings ‘Hornfest’ is a delight to the ears (if not the eyes). This year I took my Behringer 2496 DEQ along for the ride. When we measured Ed’s listening room I was shocked how different it was from my own. I was even more surprised that my open baffle speakers needed NO digital equalization in Eds room. This was disconcerting, since I had spent so much time and energy pursuing a digital solution.

We ended up running Joels tubed Jolida CD player directly into Ed’s ‘Truth’ buffered LDR preamp and finally into the awesome Dowdy Llama 826 / GM-70 amp. This resulted in stunning presence, incredible speed and dynamics on the baffle-less  speakers. How can digital equalization sap so much life from music? Certainly, more research is needed.

Here is a link to a video of that setup…

Open baffle speaker by Greenvalve Audio at Hornshoppe Hornfest 2010 Dowdy GM-70 Amp


6 responses

  1. Aaron


    I watched your video on youtube (Open baffle speaker at Hornshoppe fest 2010) and was mightily impressed by the sound! I’m very curious as to the details of your open baffle speaker: what are its specs? Drivers, woofer, dimensions, etc.? I would be really grateful if you could e-mail me a brief rundown. They really sound wonderful — and that’s on youtube!

    By the way, what music were you playing in the video? Lovely!



    July 27, 2010 at 4:32 am

    • Hi Aaron,

      The “baffless” speakers are a 4 way design using modified Hawthorne Augies with solid state amplification for the lowest frequencies. The Dowdy GM70 amp was then driving the remaining “three-way” speakers: Modified Eminence Alpha 15″ woofers with second-order crossover, vintage Grundig mid-bass x4 with second-order crossover and Fostex FF85K run full range no crossover. Phase was carefully matched between the Grundig drivers and the Eminence woofers. Even though the FF85K were left crossoverless and run full-range, they integrated very well with the system, in fact the stunning presence of the music was lost when adding even a cap as a first-order crossover.

      I have heard no speaker as “fast” as these, when the sticks hit the drum I swear I can hear the skins stretch 😉

      July 27, 2010 at 5:19 am

    • OH YA, you asked about the music 😉 It is an album from I dont remember exactly which one but they are all good. It might be one of the “Sounds from the Ground” releases.

      July 27, 2010 at 12:53 pm

  2. krishan mehra

    i am also planning to build a OB with lifelike presence of the musicians in the room with lucid midrange,does your speaker sound similar

    September 3, 2011 at 5:04 am

  3. Hi Krishan! All of the many open baffle speakers I have built produce really great imaging. The lucid midrange comes from a driver that has very little phase shift in the critical vocal frequency range. The only drawback to open baffle is that it can sound ‘dry’. Acoustic guitar tends to have less fullness and body with open baffle speakers. I am not speaking of the low frequency cancellation below drivers resonant frequency that open baffle is known for. Rather, some box resonance adds to fullness acoustic instrument reproduction. The key is balance, which is why I really enjoy the Hornshoppe Horns for acoustic recordings.

    September 5, 2011 at 10:15 am

  4. krishan mehra

    Thanks Buzz

    September 5, 2011 at 11:17 am

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